Magnetic Audio Telescope

On Wed, 21 Feb 2007 10:32:29 +1300, cliff wright
wrote:

Hi Chris.
That sounds very interesting indeed! How is the coil wound? Just
scrambled or properly wave wound, and does it use multistrand
Litzendraht wire?

It's neatly wound for a tight fill, not wave wound, with ordinary
enameled magnet wire.

I wonder also what sort of gain and bandwidth your preamplifier stage has?

It's just a capacitor coupled amp with a gain of 20, from a few hertz to
about 100 kHz.

What about potential problems with 50/60 Hz hum fields and TV set
interference?

There's all sorts of relatively constant noise, including some 60 Hz.
There aren't a lot of nearby sources of interference. The output is
viewed as frequency vs time (0-22 kHz, 5 Hz resolution), and
interference is pretty obvious and doesn't stop me from looking for
signals correlated with my camera events.

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

On 20 Feb 2007 20:01:20 -0800, "Radium" wrote:

What are "fireballs"?

Bright meteors.

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

Chris L Peterson wrote:

On Wed, 21 Feb 2007 10:32:29 +1300, cliff wright
wrote:


Hi Chris.
That sounds very interesting indeed! How is the coil wound? Just
scrambled or properly wave wound, and does it use multistrand
Litzendraht wire?


It's neatly wound for a tight fill, not wave wound, with ordinary
enameled magnet wire.


I wonder also what sort of gain and bandwidth your preamplifier stage has?


It's just a capacitor coupled amp with a gain of 20, from a few hertz to
about 100 kHz.


What about potential problems with 50/60 Hz hum fields and TV set
interference?


There's all sorts of relatively constant noise, including some 60 Hz.
There aren't a lot of nearby sources of interference. The output is
viewed as frequency vs time (0-22 kHz, 5 Hz resolution), and
interference is pretty obvious and doesn't stop me from looking for
signals correlated with my camera events.

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

Thanks Chris.
If I get some free time soon I must try this out. I might also try a
variable bandwidth and gain version especially if I get some results
down here in NZ.
Regards Cliff wright