[time-nuts] HF frequency counting receiver

Graham / KE9H ke9h.graham at gmail.com
Mon Jun 20 13:10:22 EDT 2016


You need to be able to measure frequency accurately in the milli-Hertz
range to be competitive in the frequency measuring contests.

I doubt the Selective Voltmeters have that level of resolution. I think
they 'only' read to 0.1 Hz.

--- Graham



On Mon, Jun 20, 2016 at 11:52 AM, Pete Lancashire <pete at petelancashire.com>
wrote:

> Never tried it but a Selective Level Meter aka HP 3586A/B/C ?
>
> On Mon, Jun 20, 2016 at 7:51 AM, Nick Sayer via time-nuts
> <time-nuts at febo.com> wrote:
> > 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?
> >
> >
> > Sent from my iPhone
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