On 9/13/16 10:04 AM, Mike Baker wrote:
Hello, Time-Nutters--
Full disclosure-- I am a complete newbie at understanding the
intricacies of generating a really stable, low phase noise, accurate
frequency reference for microwave reception up around the 8 GHz
DSN (Deep Space Network) band. I have been following the back
and forth comments on the Time-Nuts list about improving the
Trimble T-bolt's 10 MHz output but confess that most of it is pretty
much deeper technical voo-doo than I am comfortable with.
I have been following the exploits of a group of folks around the
world who receive the incredibly weak signals from space probes
such as Juno. The idea is to detect the signals and then deduce
and confirm what probe is being detected by analyzing its doppler
and orbital characteristics.
Accordingly, what possible options might I have open to obtaining
a decent 10 MHz frequency reference for working up at the 8 GHz
DSN band? Any feedback on this will be much appreciated!
I think that any sort of OCXO will do... your tbolt is probably "quiet
enough".
It's phase noise in the 1-100 Hz kind of area that you want to think
about, your LO multiply chain will increase the noise floor by
20*log10(N) going from 10 to 8450. (about 60dB)
The carrier you're looking for is very narrow band.. you can look at the
data sheet for a SDST (on General Dynamics website) and get the phase
noise of the AuxOsc, which will be the worst case noise. If they're
doing 2 way turnaround, the noise is better.
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