What is the highest radio frequency used for radio astronomy?

On Aug 30, 11:42 pm, (Paul Schlyter) wrote:
In article om,
laura halliday wrote:

The usual agreement is that it's radio astronomy when the
incoming signals are electronically detected (e.g. diodes) and
processed. It's optical/infrared astronomy when the incoming
signals are measured by a bolometer or other non-electronic
means. There is, naturally, some crossover.

Given today's CCD chips which indeed are electronic devices, does that
mean todays optical telescopes, with CCD chips which detect light
electronically, have become radio telescopes?

Can't say I agree with that; CCDs count photons, which makes
them a lot closer to bolometers than diodes.

The other issue, of course, is just what difference it makes.
Astronomers examine the universe to see how it works.
They use various wavelengths to do it.

Laura Halliday VE7LDH "Non sequitur. Your ACKS are
Grid: CN89mg uncoordinated."
ICBM: 49 16.05 N 122 56.92 W - Nomad the Network Engineer