Peter,
That is correct and what I have attempted to describe. A station not adjusting properly for Doppler shift will appear to "move" across the passband into stations who are making corrections. (voice or CW)
There are several categories for correction, as I see it by order of occurrence...(and there may be more)
1 - People who use "full" Doppler correction via software, adjusting both TX and RX to stay on the satellite's frequency.
2 - People who use "half" Doppler correction by tuning the higher of two frequencies. This is common for people who are portable or want the simplest method of staying on another station. In the mode, you will move slightly. I do this often in the field. It's not perfect.
3 - People who use "TX only" correction. I see this often and I believe it's an incorrect practice to always tune TX because sometimes that means on mode J you'll likely move across QSO's in progress.
4 - Probably the least common I observe, people who use "full" Doppler correction manually. I believe it is a little more difficult to do this on fast moving LEO's, especially on CW.
My original email was trying to discover whether or not listening on USB while transmitting on CW might make it easier for "CW drifters" to know they are part of a problem. Occasionally when this problem occurs with USB voice, the perpetrating stations are not able to hear well enough to know they are causing a problem.
73 Clayton W5PFG
On Fri, Feb 7, 2014 at 11:33 AM, Ng, Peter [email protected] wrote:
Yes, the frequency in use by the CW station that is not adjusting for doppler will appear to be moving for stations that are adjusting for doppler....right?
Peter ve7ngp
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of John Becker Sent: February 7, 2014 09:27 To: [email protected] Subject: [amsat-bb] Re: Listening on USB when operating CW
On 2/7/2014 11:18 AM, Ng, Peter wrote:
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?
by "stable" do you mean a freq already being used?
John, W0JAB
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Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb