I'd like to measure the total frequency drift/shift over time from cold
start on an R-4A. Since I have a stable HF TCXO source I'd like to do
something like the following:
1. Connect the stable source to the receiver's antenna input ;
2. Feed the audio output of the receiver into my laptop;
3. Turn the receiver on and quickly tune it so that the audio output is
some reference audio tone (probably 1 kHz);
4. Have the laptop monitor & graph the drift/shift in output frequency
over time, preferably one (1) hour.
Does anyone have a recommendation for a suitable piece of software for
my Dell laptop (running XP Professional) that would accept the audio input
and graph the data, and allow the complete results to be saved as a file?
An expandable (e.g., high-res) scale would be preferred because it would
make it easier to spot any momentary but self-correcting shifts that may
occur (i.e., the frequency "jumps" a few tens of Hz for a short interval -
less than one second - then returns to where it was).
I can do this manually with a frequency counter but allowing the
laptop to do the work is preferable. ;-)
The next step is separate monitoring of the frequency-determining
circuits in the receiver to see how much each one is contributing to any
observed problem(s).
73/arf,
Paul, K4MSG
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