AFC circuit for satcan

[yentzee]

Hi,
could anyone tell me if it is difficult to include an AFC circuit to the receiving satcan to compensate the frequencydrift of the gunndiode at the sender site? I had a look around google but my knowledge of electrotechnics isn't good enough to apply this to a satcan. From my understanding is there a circuit that measures signalstrength and regulates a resistor in front of the tuning potentiometer accordingly, but I might be totally wrong.
Thanks for helping.

[Maximus]

I think rf head is your man for that


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[Botten]

I've got a schematic, but I don't have the source code.


https://www.imgbly.com/ib/AbGrchJtaa

Enigma sells sat cans with tracking

https://enigma-shop.com/component/hikas ... kit-module

[yentzee]

Thanks a lot. I have lots of satcans here so I don't really want to buy one. Maybe someone else can supply a circuit with the code.

[reverend]

Is the output of your receiver DC coupled from the de-modulator? You can test this by measuring the output voltage from the receiver and moving the Gunn frequency up and down. If the DC voltage at the output of the receiver also varies then you have a way of measuring the frequency offset.

Run this DC voltage through a low pass filter to get rid of the audio and just leave the DC voltage (something with a cut-off of below 3 Hz ought to work). This will give you an AFC voltage.

How you couple this to a SatCan I don't know - I've never played with them!