----- Original Message ----- From: "Fabiano Moser" fabianomoser@gmail.com To: "amsat-bb" AMSAT-BB@amsat.org Sent: Thursday, July 02, 2009 6:19 PM Subject: [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?
-- 73 Fabiano Moser CR7/PY5RX ARISS-PORTUGAL (Amateur Radio on the International Space Station) Representative at Teleconference and Portugal Telebridge Coordinator. AMRAD/AMSAT-CT http://www.amrad.pt/ariss.php
Hi Fabiano, CR7/PY5RX
My preferred metod (from OSCAR-6 to AO40) is to adjust only the Uplink frequency in order to keep my voice in downlink as clear as possible exactly as you actually do manually. If the station in contact with me moves up or down I invite the operator to move the VFO of his TX to come again in my constant receiving frequency.
73" de i8CVS Domenico