[amsat-bb] Doppler Frequency Device Control

Hi guys,

If I'm not mistaken, several years ago, I read an article which shows how to build an electronic device to run a pair of Yaesu, Kenwood or Icom VHF/UHF rigs to compensate for doppler effect on inverting or non inverting transponders.

Could anyone guide me back to that, please?

I thank you in advance.

73,

Luciano PT9KK