[time-nuts] HF frequency counting receiver
nsayer at kfu.com
Mon Jun 20 10:51:56 EDT 2016
I'm considering taking a shot at the next ARRL frequency measurement contest.
The assumption going in is that the signal is CW, with at least a half minute or so of just solid "on" at one point or another and that reception is reasonably good.
I've got a good TIA and excellent references, but that's the easy part, it seems to me. It seems to me that what I really need to do is make a synthesized heterodyne receiver that can present an accurately tuned RF band pass - say, 10 kHz wide with the synthesizer set for
5 kHz steps - to the TIA, with some manually tunable high-pass and low-pass filtering to isolate the signal of interest. If the mixer got its LO from a synthesizer with a GPSDO reference, it seems to me that you could then measure the frequency of the signal of interest (now an audio frequency, so you can listen to it too) with the TIA (also getting the GPSDO reference) and then do simple math to arrive at the actual RF frequency.
Anybody have any thoughts?
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