Tuning the gyrator3
R3 for tuning the frontend
R6 for setting the gain
R16 for zeroing the output
R21 to set the range for the frontpanel meter
R22 to set the range for the A/D
The procedure I used was:
- set R16 to zero the meter and A/D
- center the R3 and R6
- adjust R3 for max signal.
- adjust R21 so meter is mid scale. I may need a bigger value for R21 as the meter is offscale.
- tweak R6 for max. This seems sensitive, maybe pushing the circuit into oscillation?
In the pic above I am using my voltmeter, which has recording software, to monitor the signal. I've set the outputs to about 2.4V.
I can clearly see the signal change as I rotate the antenna, so its receiving something. I've adjusted it to max signal. That's pointing off to the NE, so I may indeed be receiving from Skilton, UK.
I'll let it run to night to see if I can record the sunset events.