[amsat-bb] Re: Listening on USB when operating CW

[Clayton Coleman]

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 <Peter.Ng at bccdc.ca> 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: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On Behalf Of John Becker
> Sent: February 7, 2014 09:27
> To: amsat-bb at amsat.org
> 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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