[amsat-bb] I: How you do DOPPLER correction in Linear Transponders?

Francesco Grappi f.grappi at tin.it
Thu Jul 2 09:32:30 PDT 2009

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

Frank IW4DVZ

-----Messaggio originale-----
Da: amsat-bb-bounces at amsat.org
[mailto:amsat-bb-bounces at 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

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?

Fabiano Moser CR7/PY5RX
ARISS-PORTUGAL (Amateur Radio on the International
Space Station) Representative at Teleconference and
Portugal Telebridge Coordinator. AMRAD/AMSAT-CT

"There is no great talent without great will. (Honoré
de Balzac)"
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