Hi Fabiano,

In my opinion for sure keep fixed downlink frequency and adjust uplink frequency. So on this way you don't "slip" on the transponder downlink.....

73 Frank IW4DVZ

-----Messaggio originale----- Da: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] Per conto di Fabiano Moser Inviato: giovedì 2 luglio 2009 18.20 A: amsat-bb Oggetto: [amsat-bb] How you do DOPPLER correction in Linear Transponders?

Dear friends,

We know that some Satellite Operators use diferent system to doppler control.

For Linear Transponder 1) Adjust uplink and downlink automatic by CAT? (Not always woks, some times I´m up or down from the computer adjust) 2) Adjust uplink and downlink manual 3) Keep Uplink fixed and adjust only the Downlink frequency.

What is the more indicate method to use? FT-847 have knob to adjust Uplink without change downlink VFO, and I´m using it to keep my voice in downlink at same downlink much I can.

But I know some operators use fixed uplink.

How you do?