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

[Clayton Coleman]

Hi Tim,

I completely agree that different methods of Doppler shift correction
yield slightly different results.  The "one true rule" is a good
source for guidance however some don't follow it -- even remotely.   I
do apologize if my generalization rubbed you the wrong way.

Since your direct email indicated to me you adjust your transmit
frequency on AO-7 mode B, that would indicate you are following a good
practice of correction.  Likely meaning you are NOT one of the
stations who drift during their entire sequence of calling CQ for five
minutes.....  Not everyone plays nice in the schoolyard.  I've been
known to screw up and probably am not immune from it in the future.

I still wonder if the offenders listened on USB would they realize
they've come onto a frequency being used by two or more stations
engaged in a voice QSO?

73
Clayton
W5PFG

On Fri, Feb 7, 2014 at 3:45 PM,  <tim at n3tl.com> wrote:
> I'm hoping this post makes it to the AMSAT-BB, although I have sent Mr.
> Coleman a longer response directly.
>
> I have to take issue with this statement, Mr. Coleman, which begins your
> second sentence in response to Mr. Ng:
>
> "A station not adjusting properly for Doppler shift...."
>
> Computer-control stations and manual-control stations are adjusting for
> Doppler differently. I have done - and will continue to do - both. In my
> opinion, neither is incorrect; they simply differ from each other.
>
> 73 and God Bless,
> Tim - N3TL
> Evansville, Ind. - EM68
>
>
> -------- Original Message --------
> Subject: [amsat-bb] Re: Listening on USB when operating CW
> From: Clayton Coleman <kayakfishtx at gmail.com>
> Date: Fri, February 07, 2014 2:04 pm
> To: "Ng, Peter" <Peter.Ng at bccdc.ca>
> Cc: "amsat-bb at amsat.org" <amsat-bb at amsat.org>
>
> 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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