[amsat-bb] Re: Listening on USB when operating CW
Peter.Ng at bccdc.ca
Fri Feb 7 09:18:19 PST 2014
Correct me if I'm wrong, but doesn't automatic doppler corrections dynamically change your frequency to compensate for doppler? Would this mean anyone engaging in doppler correction are actually drifting into a stable frequency?
73 Peter ve7ngp
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Clayton Coleman
Sent: February 7, 2014 08:43
Subject: [amsat-bb] Listening on USB when operating CW
I assume many home station satellite operators utilize some kind of full-duplex radio or combination of two radios for CW on the current satellites.
Lately, as I have been listening a lot more with my FUNcube Dongle
Pro+, I have observed many CW stations drifting across the satellites'
passband. I realize this is not a new phenomenon. I would assume these drifting stations are NOT using any type of computer Doppler correction. If they were using computer control, I would assume their CW would stay on the same place in the transponder's passband. It is visually apparent when the stations manually make larger frequency movements because of the curve displayed on my SDR application's waterfall display.
Many times I have been engaged in a QSO only to have someone CQ'ing on CW drift across my existing QSO. Anyone who operates satellites has probably had this happen to them many times. Sometimes myself or others in QSO may try to tell the CW operator "Hello - QSO in progress" but it is apparent they are not hearing us.
My question is, does it make sense for people using CW on the satellites to have their receiver set to USB? Do some operators do this? If listening on a VFO with USB and had your transmit VFO set to CW, would this help make it easier for CW ops to know when they have drifted into an existing voice QSO?
Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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