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On 30 Jun 2006 01:29:54 -0700, "George Dishman"
wrote: John C. Polasek wrote: ... I may be misinterpreting what is in the model, but what I have tried to represent in the upper model leg is a digital differential analyzer doing numerical integration on data taken from the ephemeris and double integrating it for range that would then update the ephemeris. In so doing only the constant G is involved, and it's all mathematical. Then to produce anything resembling frequency, for later comparison with the real hardware, from the point V(t), one must introduce the multiplier -f0/c. In this regard I would expect that the multiplier is a mathematic constant being 1/WL.sphone If this is wrong, just say so and I can modify my model, It is wrong. The model integrates a mathematical representation of the initial location and motion of the craft with all subsequent gravitational accelerations and specific manoeuvre effects to model the velocity at any time which is pretty much what you say in the first paragraph. George, I appreciate your efforts to produce an ASCII style diagram, but it defines in detail only the hardware that is the lower left half of my diagram (I have improved the diagram; take a look at the website). The hardware is 100%. In fact, I agree that aside from A_radio, both model and hardware arrive at the same velocities. But you are not addressing the frequency problem in the model , the top right half of the diagram. It is this: if you checked with NIST in 1987 you would get a frequency 2.292......, and called NIST today you would get exactly the same number 2.292....... I call this f87 in the diagram. This is would be true if all atomic clocks, the station clock, the maser standard, accelerated alike. You can see how this would qualify f87 as a constant if it has the same value that it was assigned 20 years earlier. So the original numeric F87 is a constant in the model that has no way of tracking acceleration. And, unfortunately there is no accurate way of determining *true* frequency, of if clock frequency is actually increasing, since the easiest recourse is to cause the best possible atomic reference to make a one second gate, whereupon the station clock counter would let through 2.292.... cycles. At that point, the relativistic Doppler equation is applied to the recorded transmit frequency to predict the modelled receive frequency for comparison against the actual receive frequency recorded from the hardware. but then tell me how this coefficient -f0/c is brought up to date with the transmitting clock. With an analog computer, yes, or using the station clock to drive the DDA, but that looks like a nullity also. I take back f0/c, the villain is f0. The latter, the station clock is used to drive the exciter to produce a frequency which is a known multiple of the clock reference frequency. I suspect they would have used a synthesiser just like the transponder on the craft so that the exciter was locked to the station clock. This is hardware In th following, the capital "F" indicates a frequency which is a number. The number on transmit is loaded into the hardware and governs the ratio of the transmitted frequency to the station clock. On receive the number fed into the synthesiser (DDS) F_het is chosen to be slightly offset from the expected receive frequency and the actaul signal shown as f_het is heterodyned with the signal from the low noise amp (LNA). The difference is then measured again using the station clock as a reference so that the number F_rx written into the files is the ratio of the actual receive frequency f_rx to the actual clock frequency f_ref. Configuration during transmission Exciter _________________ f_ref / f_tx \ station -------- DDS -------- Amp -------- to dish clock ^ | F_tx -------- Written to data file Configuration during reception Exciter _________________ f_ref / f_het \ station ---+---- DDS ---+---- Amp ... not used clock | ^ | | | | f_het | F_het | | | | | f_rx | mixer (*)-------- from dish / LNA | | | | f_if | | -------- counter f_ref | | F_if | v Sum of measured value F_if and F_het written to data file: F_rx = F_het + F_if f_* indicates the frequency of an electrical signal F_* indicates a frequency in the form of a number It is clear there is substantial misunderstanding somewhere. The hardware on the Pioneer is 100% Yes, you have a problem. Why don't you start to fix it by reading the referred-to papers, or George or my previous posts, which you seem to be conveniently ignoring? You say "the station clock at the time of the tracking session is used in the model". Please tell very specifically how this can be done. The diagrams above attempt to do that. Checking the frequency with NIST would be simplest. You can update an atomic clock over the telephone. Today we use GPS to lock our company clock to the international standard. I don't know what method was in use at the time of the Pioneer mission but there would have been an equivalent. The station 'clock' was a hydrogen maser which ran continuously producing a 10MHz reference frequency to which all the instruments are locked. It's hardware Their site has a sample daily record of a clock being checked, that shows infinitesimal *random* daily changes about +-2e-13 which is nothing. Remember that by hypothesis, NIST's masers have advanced by exactly the same fraction as the statioin clock, so they all march together. Yes. But f0 in the model is stuck in the past. We need to discuss f0 in the model. No, f_tx must be derived from the station clock at the time of transmission since it was an actual electrical signal. Similatrly f_rx was compared against the station clock at the time of reception to get the number F_rx. Both numbers were written to the data files which we can now use. but this is hardware, not model Tell me how the number f0 is custom adjusted to the station clock's frequency, when there is no way of determining its frequency in the first place. In the actual hardware, f0 (which I think corresponds to f_het in my terminology, local oscillator for the heterodyne receiver) is produced directly from the station clock by the synthesiser in the exciter assembly. still hardware My argument is simply that f0 is set in stone, ... You can make a battery that produces a reference voltage for calibration purposes, but you cannot keep a sample of a frequency in a bottle in that way and use it later. The reference frequency signal is what is produced by the maser at the time. George John P |
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![]() "John C. Polasek" wrote in message ... On 30 Jun 2006 01:29:54 -0700, "George Dishman" wrote: John C. Polasek wrote: ... I may be misinterpreting what is in the model, but what I have tried to represent in the upper model leg is a digital differential analyzer doing numerical integration on data taken from the ephemeris and double integrating it for range that would then update the ephemeris. In so doing only the constant G is involved, and it's all mathematical. Then to produce anything resembling frequency, for later comparison with the real hardware, from the point V(t), one must introduce the multiplier -f0/c. In this regard I would expect that the multiplier is a mathematic constant being 1/WL.sphone If this is wrong, just say so and I can modify my model, It is wrong. The model integrates a mathematical representation of the initial location and motion of the craft with all subsequent gravitational accelerations and specific manoeuvre effects to model the velocity at any time which is pretty much what you say in the first paragraph. George, I appreciate your efforts to produce an ASCII style diagram, but it defines in detail only the hardware that is the lower left half of my diagram (I have improved the diagram; take a look at the website). It is still lacking a clear description of what the symbols mean and each stage of the process. It really isn't much use at all at present but if you add some explanations it could be very helpful. An example is: The hardware is 100%. In fact, I agree that aside from A_radio, both model and hardware arrive at the same velocities. The term "A_radio" is not explained anywhere in the text though it appears in your diagram. I would normally assume the usual radio convention that "A" stands for Amplitude so A_radio is the transmitter power of 250kW but that makes no sense. Plaese explain your terms in the paper. But you are not addressing the frequency problem in the model , the top right half of the diagram. It is this: if you checked with NIST in 1987 you would get a frequency 2.292......, and called NIST today you would get exactly the same number 2.292....... I call this f87 in the diagram. This is would be true if all atomic clocks, the station clock, the maser standard, accelerated alike. Since the speed of the craft is determined from the ratio F_rx/F_tx, only the clock change between the time of transmission and time of reception matters. For example consider a slight alternative where all terrestrial clocks were stable in 1987 so the Tx signal was at 2.292GHz exactly but the clocks doubled in frequency in the intervening years so the Tx signal was stable but at 4.584GHz when a later reading was taken. The returned frequency would also be doubled (ignoring hardware limitations) so the ratio F_rx/F_tx would be unaffected and the derived speed would be correct. What that means is that your "f87" doesn't exist. You can see how this would qualify f87 as a constant if it has the same value that it was assigned 20 years earlier. So the original numeric F87 is a constant in the model that has no way of tracking acceleration. And, unfortunately there is no accurate way of determining *true* frequency, You don't need to know the "true" frequency, the only thing used is the ratio. of if clock frequency is actually increasing, since the easiest recourse is to cause the best possible atomic reference to make a one second gate, whereupon the station clock counter would let through 2.292.... cycles. At that point, the relativistic Doppler equation is applied to the recorded transmit frequency to predict the modelled receive frequency for comparison against the actual receive frequency recorded from the hardware. but then tell me how this coefficient -f0/c is brought up to date with the transmitting clock. With an analog computer, yes, or using the station clock to drive the DDA, but that looks like a nullity also. I take back f0/c, the villain is f0. There is no such thing as "f0" in the model. The latter, the station clock is used to drive the exciter to produce a frequency which is a known multiple of the clock reference frequency. I suspect they would have used a synthesiser just like the transponder on the craft so that the exciter was locked to the station clock. This is hardware Yes, but focus on the values written to the files, F_tx and F_rx. Those are what must be used as the data input to the model. In th following, the capital "F" indicates a frequency which is a number. The number on transmit is loaded into the hardware and governs the ratio of the transmitted frequency to the station clock. On receive the number fed into the synthesiser (DDS) F_het is chosen to be slightly offset from the expected receive frequency and the actaul signal shown as f_het is heterodyned with the signal from the low noise amp (LNA). The difference is then measured again using the station clock as a reference so that the number F_rx written into the files is the ratio of the actual receive frequency f_rx to the actual clock frequency f_ref. Configuration during transmission Exciter _________________ f_ref / f_tx \ station -------- DDS -------- Amp -------- to dish clock ^ | F_tx -------- Written to data file Configuration during reception Exciter _________________ f_ref / f_het \ station ---+---- DDS ---+---- Amp ... not used clock | ^ | | | | f_het | F_het | | | | | f_rx | mixer (*)-------- from dish / LNA | | | | f_if | | -------- counter f_ref | | F_if | v Sum of measured value F_if and F_het written to data file: F_rx = F_het + F_if f_* indicates the frequency of an electrical signal F_* indicates a frequency in the form of a number It is clear there is substantial misunderstanding somewhere. The hardware on the Pioneer is 100% The hardware on the Pioneer is not shown above, only the ground segment, but I don't think the craft end is contentious. Checking the frequency with NIST would be simplest. You can update an atomic clock over the telephone. Today we use GPS to lock our company clock to the international standard. I don't know what method was in use at the time of the Pioneer mission but there would have been an equivalent. The station 'clock' was a hydrogen maser which ran continuously producing a 10MHz reference frequency to which all the instruments are locked. It's hardware So here's the next stage: F_tx(t1) \ V_dsn_t(t1) -- Doppler -- F_cr(t2) V_cr(t2) / where F_cr(t) is the frequency received at the craft at time t (one can subsume the 240/221 fixed turnround ratio), V_cr(t) is the velocity of the craft at time t and V_dsn_t(t) is the velocity of the DSN transmit site at time t which is known from the ephemeris and Earth rotation data. Then: F_cr(t2) \ V_dsn_r(t3) -- Doppler -- F_model(t3) V_cr(t2) / Where F_model(t) is the receive frequency predicted by the model for reception at time t and V_dsn_r is the velocity of the DSN receive site at time t. The times a t1: time of transmission t2: time when the signal is transponded by the craft t3: time of reception t3 is as recorded in the data files but since the propagation time depends on the range, t2 and then t1 have to be calculated using the modelled location at time t2. The transmit frequency was generally constant through any contact period but the times are needed to apply the ephemeris and Earth rotation Doppler effects. The resulting receive frequency predictions are then compared with the actual received values F_rx(t3) and the model parameters adjusted to minimise the error. Notice the key point, only the logged values F_tx and F_rx are used and then only as a ratio, so any error in the station clock which was common to both times cancels out. The only discrepancy that gets through is the amount the station clock drifted between time t1 and time t3. Note also that clocks were at different sites. Bottom line: there is no "f0" or "f87" in the model, the role is fulfilled by the recorded values of F_tx(t). George |
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On Sat, 1 Jul 2006 20:22:56 +0100, "George Dishman"
wrote: "John C. Polasek" wrote in message .. . On 30 Jun 2006 01:29:54 -0700, "George Dishman" wrote: John C. Polasek wrote: ... I may be misinterpreting what is in the model, but what I have tried to represent in the upper model leg is a digital differential analyzer doing numerical integration on data taken from the ephemeris and double integrating it for range that would then update the ephemeris. In so doing only the constant G is involved, and it's all mathematical. Then to produce anything resembling frequency, for later comparison with the real hardware, from the point V(t), one must introduce the multiplier -f0/c. In this regard I would expect that the multiplier is a mathematic constant being 1/WL.sphone If this is wrong, just say so and I can modify my model, It is wrong. The model integrates a mathematical representation of the initial location and motion of the craft with all subsequent gravitational accelerations and specific manoeuvre effects to model the velocity at any time which is pretty much what you say in the first paragraph. George, I appreciate your efforts to produce an ASCII style diagram, but it defines in detail only the hardware that is the lower left half of my diagram (I have improved the diagram; take a look at the website). It is still lacking a clear description of what the symbols mean and each stage of the process. It really isn't much use at all at present but if you add some explanations it could be very helpful. An example is: The hardware is 100%. In fact, I agree that aside from A_radio, both model and hardware arrive at the same velocities. The term "A_radio" is not explained anywhere in the text though it appears in your diagram. I would normally assume the usual radio convention that "A" stands for Amplitude so A_radio is the transmitter power of 250kW but that makes no sense. Plaese explain your terms in the paper. Yes A_radio is the 1.1x10^-10m/ss given as the radiative effect of 8 watts continuously on, pushing us awayfrom the earth, which when lumped with others for a bias of .9 units that make an observed 7.8 units go to 8.7 units. But you are not addressing the frequency problem in the model , the top right half of the diagram. It is this: if you checked with NIST in 1987 you would get a frequency 2.292......, and called NIST today you would get exactly the same number 2.292....... I call this f87 in the diagram. This is would be true if all atomic clocks, the station clock, the maser standard, accelerated alike. Since the speed of the craft is determined from the ratio F_rx/F_tx, only the clock change between the time of transmission and time of reception matters. For example consider a slight alternative where all terrestrial clocks were stable in 1987 so the Tx signal was at 2.292GHz exactly but the clocks doubled in frequency in the intervening years so the Tx signal was stable but at 4.584GHz when a later reading was taken. The returned frequency would also be doubled (ignoring hardware limitations) so the ratio F_rx/F_tx would be unaffected and the derived speed would be correct. What that means is that your "f87" doesn't exist. You can see how this would qualify f87 as a constant if it has the same value that it was assigned 20 years earlier. So the original numeric F87 is a constant in the model that has no way of tracking acceleration. And, unfortunately there is no accurate way of determining *true* frequency, You don't need to know the "true" frequency, the only thing used is the ratio. of if clock frequency is actually increasing, since the easiest recourse is to cause the best possible atomic reference to make a one second gate, whereupon the station clock counter would let through 2.292.... cycles. At that point, the relativistic Doppler equation is applied to the recorded transmit frequency to predict the modelled receive frequency for comparison against the actual receive frequency recorded from the hardware. but then tell me how this coefficient -f0/c is brought up to date with the transmitting clock. With an analog computer, yes, or using the station clock to drive the DDA, but that looks like a nullity also. I take back f0/c, the villain is f0. There is no such thing as "f0" in the model. The latter, the station clock is used to drive the exciter to produce a frequency which is a known multiple of the clock reference frequency. I suspect they would have used a synthesiser just like the transponder on the craft so that the exciter was locked to the station clock. This is hardware Yes, but focus on the values written to the files, F_tx and F_rx. Those are what must be used as the data input to the model. In th following, the capital "F" indicates a frequency which is a number. The number on transmit is loaded into the hardware and governs the ratio of the transmitted frequency to the station clock. On receive the number fed into the synthesiser (DDS) F_het is chosen to be slightly offset from the expected receive frequency and the actaul signal shown as f_het is heterodyned with the signal from the low noise amp (LNA). The difference is then measured again using the station clock as a reference so that the number F_rx written into the files is the ratio of the actual receive frequency f_rx to the actual clock frequency f_ref. Configuration during transmission Exciter _________________ f_ref / f_tx \ station -------- DDS -------- Amp -------- to dish clock ^ | F_tx -------- Written to data file Configuration during reception Exciter _________________ f_ref / f_het \ station ---+---- DDS ---+---- Amp ... not used clock | ^ | | | | f_het | F_het | | | | | f_rx | mixer (*)-------- from dish / LNA | | | | f_if | | -------- counter f_ref | | F_if | v Sum of measured value F_if and F_het written to data file: F_rx = F_het + F_if f_* indicates the frequency of an electrical signal F_* indicates a frequency in the form of a number It is clear there is substantial misunderstanding somewhere. The hardware on the Pioneer is 100% The hardware on the Pioneer is not shown above, only the ground segment, but I don't think the craft end is contentious. Checking the frequency with NIST would be simplest. You can update an atomic clock over the telephone. Today we use GPS to lock our company clock to the international standard. I don't know what method was in use at the time of the Pioneer mission but there would have been an equivalent. The station 'clock' was a hydrogen maser which ran continuously producing a 10MHz reference frequency to which all the instruments are locked. It's hardware So here's the next stage: F_tx(t1) \ V_dsn_t(t1) -- Doppler -- F_cr(t2) V_cr(t2) / where F_cr(t) is the frequency received at the craft at time t (one can subsume the 240/221 fixed turnround ratio), V_cr(t) is the velocity of the craft at time t and V_dsn_t(t) is the velocity of the DSN transmit site at time t which is known from the ephemeris and Earth rotation data. Then: F_cr(t2) \ V_dsn_r(t3) -- Doppler -- F_model(t3) V_cr(t2) / Where F_model(t) is the receive frequency predicted by the model for reception at time t and V_dsn_r is the velocity of the DSN receive site at time t. The times a t1: time of transmission t2: time when the signal is transponded by the craft t3: time of reception t3 is as recorded in the data files but since the propagation time depends on the range, t2 and then t1 have to be calculated using the modelled location at time t2. The transmit frequency was generally constant through any contact period but the times are needed to apply the ephemeris and Earth rotation Doppler effects. The resulting receive frequency predictions are then compared with the actual received values F_rx(t3) and the model parameters adjusted to minimise the error. Notice the key point, only the logged values F_tx and F_rx are used and then only as a ratio, so any error in the station clock which was common to both times cancels out. The only discrepancy that gets through is the amount the station clock drifted between time t1 and time t3. Note also that clocks were at different sites. Bottom line: there is no "f0" or "f87" in the model, the role is fulfilled by the recorded values of F_tx(t). George George, look at it this way. The station and the model each have "carrier" frequencies that are "modulated" additively by the craft velocity as df = -dv/lambda. Each modulation is summed up as Df in the diagram. Let's agree that the Df's are perfectly equal. Their difference would therefore contribute zero to the output and the entire left half of the graph including Df's would no longer be interesting. However, the velocities are modulating two different frequencies, f0 in the model and f0(1+Ht) in the real system. The output difference, therefore, absent the modulation noise, is f0Ht. If one were to conduct the Pioneer experiment today, one might initialize by tinkering with velocities and ranges using the standard f0, but now with prior knowledge, I would have them first increase f0 by about 4 hz if it was last set 20 years ago. (1.5Hz/8yrs) and then tinker with velocity. Would you agree, that just in general, if f0 really increased at Hubble rate, while the copybook frequency f0 which obviously has no aegis for alteration, that a comparison of some sort would yield the linear plot we have today? John P |
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![]() "John C. Polasek" wrote in message ... On Sat, 1 Jul 2006 20:22:56 +0100, "George Dishman" wrote: Much trimmed as not contentious: The term "A_radio" is not explained anywhere in the text though it appears in your diagram. I would normally assume the usual radio convention that "A" stands for Amplitude so A_radio is the transmitter power of 250kW but that makes no sense. Plaese explain your terms in the paper. Yes A_radio is the 1.1x10^-10m/ss given as the radiative effect of 8 watts continuously on, pushing us awayfrom the earth, which when lumped with others for a bias of .9 units that make an observed 7.8 units go to 8.7 units. OK, that's clear. There's no way I would have guessed that from your paper. So here's the next stage: F_tx(t1) \ V_dsn_t(t1) -- Doppler -- F_cr(t2) V_cr(t2) / where F_cr(t) is the frequency received at the craft at time t (one can subsume the 240/221 fixed turnround ratio), V_cr(t) is the velocity of the craft at time t and V_dsn_t(t) is the velocity of the DSN transmit site at time t which is known from the ephemeris and Earth rotation data. Then: F_cr(t2) \ V_dsn_r(t3) -- Doppler -- F_model(t3) V_cr(t2) / Where F_model(t) is the receive frequency predicted by the model for reception at time t and V_dsn_r is the velocity of the DSN receive site at time t. The times a t1: time of transmission t2: time when the signal is transponded by the craft t3: time of reception t3 is as recorded in the data files but since the propagation time depends on the range, t2 and then t1 have to be calculated using the modelled location at time t2. The transmit frequency was generally constant through any contact period but the times are needed to apply the ephemeris and Earth rotation Doppler effects. The resulting receive frequency predictions are then compared with the actual received values F_rx(t3) and the model parameters adjusted to minimise the error. Notice the key point, only the logged values F_tx and F_rx are used and then only as a ratio, so any error in the station clock which was common to both times cancels out. The only discrepancy that gets through is the amount the station clock drifted between time t1 and time t3. Note also that clocks were at different sites. Bottom line: there is no "f0" or "f87" in the model, the role is fulfilled by the recorded values of F_tx(t). George, look at it this way. The station and the model each have "carrier" frequencies that are "modulated" additively by the craft velocity as df = -dv/lambda. I'm not sure what you mean by "additively", the effect of Doppler is multiplicative. The received frequency is the product of the transmitted frequency and the speed-dependent factor. That is important. Anyway the key point is that what is modulated is the carrier that was sent to the craft a few hours before, not a signal transmitted in 1987. Each modulation is summed up as Df in the diagram. Let's agree that the Df's are perfectly equal. Their difference would therefore contribute zero to the output and the entire left half of the graph including Df's would no longer be interesting. However, the velocities are modulating two different frequencies, f0 in the model and f0(1+Ht) in the real system. No, f_tx(t1 + H*(t3-t1)) in reality and f_tx(t1) in the model. See above for the definition of t1 and t3. The output difference, therefore, absent the modulation noise, is f0Ht. Since Doppler is multiplicative, you need to consider the error in the ratio, not the difference. The key though is that it applies only over the propagation time. Would you agree, that just in general, if f0 really increased at Hubble rate, while the copybook frequency f0 which obviously has no aegis for alteration, that a comparison of some sort would yield the linear plot we have today? The plot would be nearly linear because the round trip propagation time increased nearly linearly over the mission period, but since the Hubble term only applies for a few hours and not the 8 years you are assuming, it would be about 10,000 times smaller than is observed. George |
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On Sat, 1 Jul 2006 22:35:39 +0100, "George Dishman"
wrote: "John C. Polasek" wrote in message .. . On Sat, 1 Jul 2006 20:22:56 +0100, "George Dishman" wrote: Much trimmed as not contentious: The term "A_radio" is not explained anywhere in the text though it appears in your diagram. I would normally assume the usual radio convention that "A" stands for Amplitude so A_radio is the transmitter power of 250kW but that makes no sense. Plaese explain your terms in the paper. Yes A_radio is the 1.1x10^-10m/ss given as the radiative effect of 8 watts continuously on, pushing us awayfrom the earth, which when lumped with others for a bias of .9 units that make an observed 7.8 units go to 8.7 units. OK, that's clear. There's no way I would have guessed that from your paper. So here's the next stage: F_tx(t1) \ V_dsn_t(t1) -- Doppler -- F_cr(t2) V_cr(t2) / where F_cr(t) is the frequency received at the craft at time t (one can subsume the 240/221 fixed turnround ratio), V_cr(t) is the velocity of the craft at time t and V_dsn_t(t) is the velocity of the DSN transmit site at time t which is known from the ephemeris and Earth rotation data. Then: F_cr(t2) \ V_dsn_r(t3) -- Doppler -- F_model(t3) V_cr(t2) / Where F_model(t) is the receive frequency predicted by the model for reception at time t and V_dsn_r is the velocity of the DSN receive site at time t. The times a t1: time of transmission t2: time when the signal is transponded by the craft t3: time of reception t3 is as recorded in the data files but since the propagation time depends on the range, t2 and then t1 have to be calculated using the modelled location at time t2. The transmit frequency was generally constant through any contact period but the times are needed to apply the ephemeris and Earth rotation Doppler effects. The resulting receive frequency predictions are then compared with the actual received values F_rx(t3) and the model parameters adjusted to minimise the error. Notice the key point, only the logged values F_tx and F_rx are used and then only as a ratio, so any error in the station clock which was common to both times cancels out. The only discrepancy that gets through is the amount the station clock drifted between time t1 and time t3. Note also that clocks were at different sites. Bottom line: there is no "f0" or "f87" in the model, the role is fulfilled by the recorded values of F_tx(t). George, look at it this way. The station and the model each have "carrier" frequencies that are "modulated" additively by the craft velocity as df = -dv/lambda. I'm not sure what you mean by "additively", the effect of Doppler is multiplicative. The received frequency is the product of the transmitted frequency and the speed-dependent factor. The velocity of the target produces df = -vf0/c and yes, that's multiplicative. But that's the Doppler part which is down 25,000: 1 or 88db and is negligible and amounts to noise. The chart itself is a plot of the difference between the "whole frequencies" f0, a constant, and f0(1+Ht) over a substantial period of years. I tried to "make it happen" during flight time and arrived at the 1/25,000 ratio. It's all the difference in the carriers, f0 definitely constant, and freal very likely advancing, but no easy way to prove it except for the Pioneer test. Anyway the key point is that what is modulated is the carrier that was sent to the craft a few hours before, not a signal transmitted in 1987. Remember back ( in 1983 I think), it was decreed and "it is so written" that the 133Cs maser delivers 9+ gigacycles in one second which at once compromised both the frequency and the second. The station clock will read today the same as 20 years ago, by comparison with that clock. But that's not to say that it isn't running faster. There is no way to assess whether the frequency has indeed increased, certainly not with that method of comparison. The frequency increase, which I put as only a hypothesis, is "proved" in my theory: our universe is moving at the speed of light away from its center of mass and the clocks are speeding up as is the speed of light. I added a new term to Newton's -g = MG/r^2 = cdc/dr (= Hc) etc. etc. that shows the expansion effect. Each modulation is summed up as Df in the diagram. Let's agree that the Df's are perfectly equal. Their difference would therefore contribute zero to the output and the entire left half of the graph including Df's would no longer be interesting. However, the velocities are modulating two different frequencies, f0 in the model and f0(1+Ht) in the real system. No, f_tx(t1 + H*(t3-t1)) in reality and f_tx(t1) in the model. See above for the definition of t1 and t3. The output difference, therefore, absent the modulation noise, is f0Ht. Since Doppler is multiplicative, you need to consider the error in the ratio, not the difference. The key though is that it applies only over the propagation time. Would you agree, that just in general, if f0 really increased at Hubble rate, while the copybook frequency f0 which obviously has no aegis for alteration, that a comparison of some sort would yield the linear plot we have today? The plot would be nearly linear because the round trip propagation time increased nearly linearly over the mission period, but since the Hubble term only applies for a few hours and not the 8 years you are assuming, it would be about 10,000 times smaller than is observed. George John P |
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![]() "John C. Polasek" wrote in message ... On Sat, 1 Jul 2006 22:35:39 +0100, "George Dishman" wrote: "John C. Polasek" wrote in message . .. On Sat, 1 Jul 2006 20:22:56 +0100, "George Dishman" wrote: Much trimmed as not contentious: The term "A_radio" is not explained anywhere in the text though it appears in your diagram. I would normally assume the usual radio convention that "A" stands for Amplitude so A_radio is the transmitter power of 250kW but that makes no sense. Plaese explain your terms in the paper. Yes A_radio is the 1.1x10^-10m/ss given as the radiative effect of 8 watts continuously on, pushing us awayfrom the earth, which when lumped with others for a bias of .9 units that make an observed 7.8 units go to 8.7 units. OK, that's clear. There's no way I would have guessed that from your paper. So here's the next stage: F_tx(t1) \ V_dsn_t(t1) -- Doppler -- F_cr(t2) V_cr(t2) / where F_cr(t) is the frequency received at the craft at time t (one can subsume the 240/221 fixed turnround ratio), V_cr(t) is the velocity of the craft at time t and V_dsn_t(t) is the velocity of the DSN transmit site at time t which is known from the ephemeris and Earth rotation data. Then: F_cr(t2) \ V_dsn_r(t3) -- Doppler -- F_model(t3) V_cr(t2) / Where F_model(t) is the receive frequency predicted by the model for reception at time t and V_dsn_r is the velocity of the DSN receive site at time t. The times a t1: time of transmission t2: time when the signal is transponded by the craft t3: time of reception t3 is as recorded in the data files but since the propagation time depends on the range, t2 and then t1 have to be calculated using the modelled location at time t2. The transmit frequency was generally constant through any contact period but the times are needed to apply the ephemeris and Earth rotation Doppler effects. The resulting receive frequency predictions are then compared with the actual received values F_rx(t3) and the model parameters adjusted to minimise the error. Notice the key point, only the logged values F_tx and F_rx are used and then only as a ratio, so any error in the station clock which was common to both times cancels out. The only discrepancy that gets through is the amount the station clock drifted between time t1 and time t3. Note also that clocks were at different sites. Bottom line: there is no "f0" or "f87" in the model, the role is fulfilled by the recorded values of F_tx(t). George, look at it this way. The station and the model each have "carrier" frequencies that are "modulated" additively by the craft velocity as df = -dv/lambda. I'm not sure what you mean by "additively", the effect of Doppler is multiplicative. The received frequency is the product of the transmitted frequency and the speed-dependent factor. The velocity of the target produces df = -vf0/c and yes, that's multiplicative. But that's the Doppler part which is down 25,000: 1 or 88db and is negligible and amounts to noise. It would also be multiplicative if applied to your ficticious "f0" or "f87". The chart itself is a plot of the difference between the "whole frequencies" f0, a constant, and f0(1+Ht) over a substantial period of years. I tried to "make it happen" during flight time and arrived at the 1/25,000 ratio. It's all the difference in the carriers, f0 definitely constant, and freal very likely advancing, but no easy way to prove it except for the Pioneer test. Anyway the key point is that what is modulated is the carrier that was sent to the craft a few hours before, not a signal transmitted in 1987. Remember back ( in 1983 I think), it was decreed and "it is so written" that the 133Cs maser delivers 9+ gigacycles in one second which at once compromised both the frequency and the second. The station clock will read today the same as 20 years ago, by comparison with that clock. But that's not to say that it isn't running faster. There is no way to assess whether the frequency has indeed increased, certainly not with that method of comparison. There is a method in theory. One could have sent a signal in 1983 to a probe 11.5 light years away which sent it back to Earth at the same frequency. Neglecting Doppler efefcts, you would then have a copy of that original frequency to compare with the present clocks. In fact that is what your paper assumes happened. The frequency increase, which I put as only a hypothesis, is "proved" in my theory: ... No it isn't because in reality the signal was sent to the craft only a few hours earlier, not in 1987. As you say above, you "tried to 'make it happen' during flight time and arrived at the 1/25,000 ratio" which is the correct conclusion, this sort of simple drift doesn't work. There is no place for an "f0" in the model and you cannot just invent it because it suits your goal. George |
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On Sun, 2 Jul 2006 19:13:14 +0100, "George Dishman"
wrote: "John C. Polasek" wrote in message .. . On Sat, 1 Jul 2006 22:35:39 +0100, "George Dishman" wrote: "John C. Polasek" wrote in message ... On Sat, 1 Jul 2006 20:22:56 +0100, "George Dishman" wrote: Much trimmed as not contentious: The term "A_radio" is not explained anywhere in the text though it appears in your diagram. I would normally assume the usual radio convention that "A" stands for Amplitude so A_radio is the transmitter power of 250kW but that makes no sense. Plaese explain your terms in the paper. Yes A_radio is the 1.1x10^-10m/ss given as the radiative effect of 8 watts continuously on, pushing us awayfrom the earth, which when lumped with others for a bias of .9 units that make an observed 7.8 units go to 8.7 units. OK, that's clear. There's no way I would have guessed that from your paper. So here's the next stage: F_tx(t1) \ V_dsn_t(t1) -- Doppler -- F_cr(t2) V_cr(t2) / where F_cr(t) is the frequency received at the craft at time t (one can subsume the 240/221 fixed turnround ratio), V_cr(t) is the velocity of the craft at time t and V_dsn_t(t) is the velocity of the DSN transmit site at time t which is known from the ephemeris and Earth rotation data. Then: F_cr(t2) \ V_dsn_r(t3) -- Doppler -- F_model(t3) V_cr(t2) / Where F_model(t) is the receive frequency predicted by the model for reception at time t and V_dsn_r is the velocity of the DSN receive site at time t. The times a t1: time of transmission t2: time when the signal is transponded by the craft t3: time of reception t3 is as recorded in the data files but since the propagation time depends on the range, t2 and then t1 have to be calculated using the modelled location at time t2. The transmit frequency was generally constant through any contact period but the times are needed to apply the ephemeris and Earth rotation Doppler effects. The resulting receive frequency predictions are then compared with the actual received values F_rx(t3) and the model parameters adjusted to minimise the error. Notice the key point, only the logged values F_tx and F_rx are used and then only as a ratio, so any error in the station clock which was common to both times cancels out. The only discrepancy that gets through is the amount the station clock drifted between time t1 and time t3. Note also that clocks were at different sites. Bottom line: there is no "f0" or "f87" in the model, the role is fulfilled by the recorded values of F_tx(t). George, look at it this way. The station and the model each have "carrier" frequencies that are "modulated" additively by the craft velocity as df = -dv/lambda. I'm not sure what you mean by "additively", the effect of Doppler is multiplicative. The received frequency is the product of the transmitted frequency and the speed-dependent factor. The velocity of the target produces df = -vf0/c and yes, that's multiplicative. But that's the Doppler part which is down 25,000: 1 or 88db and is negligible and amounts to noise. It would also be multiplicative if applied to your ficticious "f0" or "f87". The chart itself is a plot of the difference between the "whole frequencies" f0, a constant, and f0(1+Ht) over a substantial period of years. I tried to "make it happen" during flight time and arrived at the 1/25,000 ratio. It's all the difference in the carriers, f0 definitely constant, and freal very likely advancing, but no easy way to prove it except for the Pioneer test. Anyway the key point is that what is modulated is the carrier that was sent to the craft a few hours before, not a signal transmitted in 1987. Remember back ( in 1983 I think), it was decreed and "it is so written" that the 133Cs maser delivers 9+ gigacycles in one second which at once compromised both the frequency and the second. The station clock will read today the same as 20 years ago, by comparison with that clock. But that's not to say that it isn't running faster. There is no way to assess whether the frequency has indeed increased, certainly not with that method of comparison. There is a method in theory. One could have sent a signal in 1983 to a probe 11.5 light years away which sent it back to Earth at the same frequency. Neglecting Doppler efefcts, you would then have a copy of that original frequency to compare with the present clocks. In fact that is what your paper assumes happened. I did not have that in my paper, but let's agree that a transmitted frequency will retain its same value. In the imaginary experiment you cite, there would be a frequency difference corresponding to Hf0x23yr as I see it either by frequency beat or Lissajou figure on a scope(theoretically). The curious thing is with the above, there would be a beat even though we know the original transmitted signal had the frequency f0 (2.292 as painted on the side of the clock), and you just checked with NIST and they assured you that your station was "dead-on" at 2.292 just like the marking. Yet you get a frequency difference that is not Doppler. It's the cosmic effect of clocks moving up in a gravity well. NIST has no way to keep track . The frequency increase, which I put as only a hypothesis, is "proved" in my theory: ... No it isn't because in reality the signal was sent to the craft only a few hours earlier, not in 1987. As you say above, you "tried to 'make it happen' during flight time and arrived at the 1/25,000 ratio" which is the correct conclusion, this sort of simple drift doesn't work. There is no place for an "f0" in the model and you cannot just invent it because it suits your goal. Yes George there has to be a place for f0 in the model. It's the only way you can get to compare frequencies with the Pioneer. You have just calculated the number v = 12km/s and now you need to multiply by -1/lambda and then you need to add in the base frequency f0. You need that in order to compare against Pioneer's f3. The chart comes from "whole frequency" comparison. Don't bring up that little Doppler effect; it only confuses the issue. For me, the two doppler beats deltaf can be identical. George John P |
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![]() "John C. Polasek" wrote in message news ![]() On Sun, 2 Jul 2006 19:13:14 +0100, "George Dishman" wrote: "John C. Polasek" wrote in message . .. On Sat, 1 Jul 2006 22:35:39 +0100, "George Dishman" wrote: "John C. Polasek" wrote in message m... On Sat, 1 Jul 2006 20:22:56 +0100, "George Dishman" wrote: big snip of background ... The times a t1: time of transmission t2: time when the signal is transponded by the craft t3: time of reception t3 is as recorded in the data files but since the propagation time depends on the range, t2 and then t1 have to be calculated using the modelled location at time t2. The transmit frequency was generally constant through any contact period but the times are needed to apply the ephemeris and Earth rotation Doppler effects. .... Remember back ( in 1983 I think), it was decreed and "it is so written" that the 133Cs maser delivers 9+ gigacycles in one second which at once compromised both the frequency and the second. The station clock will read today the same as 20 years ago, by comparison with that clock. But that's not to say that it isn't running faster. There is no way to assess whether the frequency has indeed increased, certainly not with that method of comparison. There is a method in theory. One could have sent a signal in 1983 to a probe 11.5 light years away which sent it back to Earth at the same frequency. Neglecting Doppler efefcts, you would then have a copy of that original frequency to compare with the present clocks. In fact that is what your paper assumes happened. I did not have that in my paper, but let's agree that a transmitted frequency will retain its same value. In the imaginary experiment you cite, there would be a frequency difference corresponding to Hf0x23yr as I see it either by frequency beat or Lissajou figure on a scope(theoretically). The curious thing is with the above, there would be a beat even though we know the original transmitted signal had the frequency f0 (2.292 as painted on the side of the clock), and you just checked with NIST and they assured you that your station was "dead-on" at 2.292 just like the marking. Yet you get a frequency difference that is not Doppler. It's the cosmic effect of clocks moving up in a gravity well. NIST has no way to keep track . Right, that is the effect you are describing. The frequency increase, which I put as only a hypothesis, is "proved" in my theory: ... No it isn't because in reality the signal was sent to the craft only a few hours earlier, not in 1987. As you say above, you "tried to 'make it happen' during flight time and arrived at the 1/25,000 ratio" which is the correct conclusion, this sort of simple drift doesn't work. There is no place for an "f0" in the model and you cannot just invent it because it suits your goal. Yes George there has to be a place for f0 in the model. It's the only way you can get to compare frequencies with the Pioneer. You have just calculated the number v = 12km/s and now you need to multiply by -1/lambda and then you need to add in the base frequency f0. You need that in order to compare against Pioneer's f3. Nope, they apply the speed to the Tx frequency at time t1 as recorded in the file in the "ramp" records. Those are a comparison of the actual transmitted frequency with the station clock at time t1, not what it was in 1987. The chart comes from "whole frequency" comparison. I know, but the hardware doesn't have any way to reproduce the clock signal as it was years earlier. Only the current clock can be used. Don't bring up that little Doppler effect; it only confuses the issue. For me, the two doppler beats deltaf can be identical. Doppler is a separate issue and I think we both understand that, what you are missing is that only the clock rate at time t1 versus t3 matters. George |
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On Sun, 2 Jul 2006 23:49:28 +0100, "George Dishman"
wrote: "John C. Polasek" wrote in message news ![]() On Sun, 2 Jul 2006 19:13:14 +0100, "George Dishman" wrote: "John C. Polasek" wrote in message ... On Sat, 1 Jul 2006 22:35:39 +0100, "George Dishman" wrote: "John C. Polasek" wrote in message om... On Sat, 1 Jul 2006 20:22:56 +0100, "George Dishman" wrote: big snip of background ... The times a t1: time of transmission t2: time when the signal is transponded by the craft t3: time of reception t3 is as recorded in the data files but since the propagation time depends on the range, t2 and then t1 have to be calculated using the modelled location at time t2. The transmit frequency was generally constant through any contact period but the times are needed to apply the ephemeris and Earth rotation Doppler effects. ... Remember back ( in 1983 I think), it was decreed and "it is so written" that the 133Cs maser delivers 9+ gigacycles in one second which at once compromised both the frequency and the second. The station clock will read today the same as 20 years ago, by comparison with that clock. But that's not to say that it isn't running faster. There is no way to assess whether the frequency has indeed increased, certainly not with that method of comparison. There is a method in theory. One could have sent a signal in 1983 to a probe 11.5 light years away which sent it back to Earth at the same frequency. Neglecting Doppler efefcts, you would then have a copy of that original frequency to compare with the present clocks. In fact that is what your paper assumes happened. I did not have that in my paper, but let's agree that a transmitted frequency will retain its same value. In the imaginary experiment you cite, there would be a frequency difference corresponding to Hf0x23yr as I see it either by frequency beat or Lissajou figure on a scope(theoretically). The curious thing is with the above, there would be a beat even though we know the original transmitted signal had the frequency f0 (2.292 as painted on the side of the clock), and you just checked with NIST and they assured you that your station was "dead-on" at 2.292 just like the marking. Yet you get a frequency difference that is not Doppler. It's the cosmic effect of clocks moving up in a gravity well. NIST has no way to keep track . Right, that is the effect you are describing. The frequency increase, which I put as only a hypothesis, is "proved" in my theory: ... No it isn't because in reality the signal was sent to the craft only a few hours earlier, not in 1987. As you say above, you "tried to 'make it happen' during flight time and arrived at the 1/25,000 ratio" which is the correct conclusion, this sort of simple drift doesn't work. There is no place for an "f0" in the model and you cannot just invent it because it suits your goal. Yes George there has to be a place for f0 in the model. It's the only way you can get to compare frequencies with the Pioneer. You have just calculated the number v = 12km/s and now you need to multiply by -1/lambda and then you need to add in the base frequency f0. You need that in order to compare against Pioneer's f3. Nope, they apply the speed to the Tx frequency at time t1 as recorded in the file in the "ramp" records. Could you clarify this mathematically, applying the speed to the TX frequency? You mean adjusting the model? How specifically? You have a way to modernize the coefficients in the model? Those are a comparison of the actual transmitted frequency with the station clock at time t1, not what it was in 1987. Can this actual transmitted frequency be brought into the model as a numeric factor? Why would it not be the standard 2.292?Or is there a wasy to transfuse it into the model even without knowing its value? If you had reason to think it might be different, then some new questions need to be raised. The chart comes from "whole frequency" comparison. I know, but the hardware doesn't have any way to reproduce the clock signal as it was years earlier. Only the current clock can be used. Well of course everything is done currently in the station and always rechecked for conformance to 2.292Ghz. The model must likewise have that same 2.292 imprimatur. And it must use it some way to produce the total frequency fmod = f0 - vf0/c, of which the 2d term is negligible. f0 is added to the converted velocity stream in the model (f87 in my diagram). But meanwhile the real clock frequencies have theoretically moved on up by f0Ht with no one able to prove otherwise, right from clocks that are currently certified as 2.292. NIST nor any one else can decide. The declaration of 133Cs being 9,192,631,770 cycles to equal 1 second, with c *declared* as 299,792,458 m/s merely locks the wavelength of the Cesium transition to 0.0326xxx m. Don't bring up that little Doppler effect; it only confuses the issue. For me, the two doppler beats deltaf can be identical. Doppler is a separate issue and I think we both understand that, what you are missing is that only the clock rate at time t1 versus t3 matters. But time t1 and t3 are with the same clock and you are forgetting that it is comparison with the model's frequency that makes the anomaly. George John P |
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![]() John C. Polasek wrote: On Sun, 2 Jul 2006 23:49:28 +0100, "George Dishman" wrote: "John C. Polasek" wrote in message news ![]() On Sun, 2 Jul 2006 19:13:14 +0100, "George Dishman" wrote: "John C. Polasek" wrote in message ... On Sat, 1 Jul 2006 22:35:39 +0100, "George Dishman" wrote: "John C. Polasek" wrote in message om... On Sat, 1 Jul 2006 20:22:56 +0100, "George Dishman" wrote: big snip of background ... The times a t1: time of transmission t2: time when the signal is transponded by the craft t3: time of reception t3 is as recorded in the data files but since the propagation time depends on the range, t2 and then t1 have to be calculated using the modelled location at time t2. The transmit frequency was generally constant through any contact period but the times are needed to apply the ephemeris and Earth rotation Doppler effects. ... Remember back ( in 1983 I think), it was decreed and "it is so written" that the 133Cs maser delivers 9+ gigacycles in one second which at once compromised both the frequency and the second. The station clock will read today the same as 20 years ago, by comparison with that clock. But that's not to say that it isn't running faster. There is no way to assess whether the frequency has indeed increased, certainly not with that method of comparison. There is a method in theory. One could have sent a signal in 1983 to a probe 11.5 light years away which sent it back to Earth at the same frequency. Neglecting Doppler efefcts, you would then have a copy of that original frequency to compare with the present clocks. In fact that is what your paper assumes happened. I did not have that in my paper, but let's agree that a transmitted frequency will retain its same value. In the imaginary experiment you cite, there would be a frequency difference corresponding to Hf0x23yr as I see it either by frequency beat or Lissajou figure on a scope(theoretically). The curious thing is with the above, there would be a beat even though we know the original transmitted signal had the frequency f0 (2.292 as painted on the side of the clock), and you just checked with NIST and they assured you that your station was "dead-on" at 2.292 just like the marking. Yet you get a frequency difference that is not Doppler. It's the cosmic effect of clocks moving up in a gravity well. NIST has no way to keep track . Right, that is the effect you are describing. The frequency increase, which I put as only a hypothesis, is "proved" in my theory: ... No it isn't because in reality the signal was sent to the craft only a few hours earlier, not in 1987. As you say above, you "tried to 'make it happen' during flight time and arrived at the 1/25,000 ratio" which is the correct conclusion, this sort of simple drift doesn't work. There is no place for an "f0" in the model and you cannot just invent it because it suits your goal. Yes George there has to be a place for f0 in the model. It's the only way you can get to compare frequencies with the Pioneer. You have just calculated the number v = 12km/s and now you need to multiply by -1/lambda and then you need to add in the base frequency f0. You need that in order to compare against Pioneer's f3. Nope, they apply the speed to the Tx frequency at time t1 as recorded in the file in the "ramp" records. Could you clarify this mathematically, applying the speed to the TX frequency? It's really simple and to me entirely obvious. You seem to have some sort of blind spot here. At time t1, a number which I call F_tx is written into a file. That number is the value fed to a synthesiser which multiplies the station reference frequency (f_ref) to produce the transmitted signal. Assuming they were using the 10MHz reference, the actual transmitted frequency, which I call f_tx, was: f_tx = F_tx * f_ref / 1e7 Since all of this happened at time t1, we can write this in parameterised form as: f_tx(t1) = F_tx(t1) * f_ref(t1) / 1e7 Note the key part: f_ref is the value at that time, not what it was in 1987. If your f0 is the 'true' frequency of the station reference at time t1 and f87 is the same as it was in 1987 then another way to look at it is: f0 / f87 = 1 + H * ( t1 - 1987) where f0 = f_ref(t1) f87 = f_ref(1987) and H is a clock frequency drift rate equivalent in some way to the Hubble Constant. You mean adjusting the model? How specifically? You have a way to modernize the coefficients in the model? No, I mean the hardware allows no alternative to using the CURRENT frequency of the station reference at any time, not what it was years earlier. I consider that completely obvious and you say something similar later. Those are a comparison of the actual transmitted frequency with the station clock at time t1, not what it was in 1987. Can this actual transmitted frequency be brought into the model as a numeric factor? Why would it not be the standard 2.292? The numerical factor stored in the data file is the ratio of the actual transmitted frequency to the frequency of the station reference at the time of transmission. How could it be anything else? Or is there a wasy to transfuse it into the model even without knowing its value? If you had reason to think it might be different, then some new questions need to be raised. There is no way to use the frequency as it was some time earlier which is the unknown quantity. The chart comes from "whole frequency" comparison. I know, but the hardware doesn't have any way to reproduce the clock signal as it was years earlier. Only the current clock can be used. Well of course everything is done currently in the station ... Exactly, that is the obvious point. ... and always rechecked for conformance to 2.292Ghz. The model must likewise have that same 2.292 imprimatur. And it must use it some way to produce the total frequency fmod = f0 - vf0/c, No, replace your "f0" by "f87(1 +h(t-1987)) because "of course everything is done currently in the station". of which the 2d term is negligible. f0 is added ... Nope, all the processes are multiplicative (other than the heterodyne and that factors out by the associative law). ... to the converted velocity stream in the model (f87 in my diagram). But meanwhile the real clock frequencies have theoretically moved on up by f0Ht with no one able to prove otherwise, right from clocks that are currently certified as 2.292. NIST nor any one else can decide. Yes, so you have to use the "moved on" value, in other words your f0 is defined as: f0 / f87 = 1 + H * ( t1 - 1987) The declaration of 133Cs being 9,192,631,770 cycles to equal 1 second, with c *declared* as 299,792,458 m/s merely locks the wavelength of the Cesium transition to 0.0326xxx m. Don't bring up that little Doppler effect; it only confuses the issue. For me, the two doppler beats deltaf can be identical. Doppler is a separate issue and I think we both understand that, what you are missing is that only the clock rate at time t1 versus t3 matters. But time t1 and t3 are with the same clock ... Yes that the point I'm trying to get across, the clock at t1 is NOT at the frequency f87 which is your mistake. ... and you are forgetting that it is comparison with the model's frequency that makes the anomaly. The model's prediction for the frequency received at time t3 is the numerical value recorded as at time t1 as F_tx(t1) multiplied by the various Doppler factors. George |
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