[amsat-bb] Doppler adjustment proper procedure question

[Greg D]

No.  There's a 3x difference in Doppler between 2m and 70cm.  Adjusting
(correcting for) the higher one does a 3x better job at maintaining a
constant position with the satellite transponder's passband (which is
the objective) than messing with the lower one, but neither is perfect. 
Best is computer controlling both radios, since both up and downlinks
are affected by Doppler.

Because of this, it's not simply an administrative decision.  Physics
can't be legislated.

Greg  KO6TH


Ted Krempa via AMSAT-BB wrote:
> Just curious....instead of irrational bashing of ARRL (which looks after ALL
> ham radio interests, including minor niche groups like sat operators) , why
> can't the answer simply be to adjust either the up or down frequency? The
> 'computer control' has nothing to do with it, no?
>
> 73, K7TRK
>
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Dave Webb
> KB1PVH via AMSAT-BB
> Sent: Friday, June 21, 2019 12:12 PM
> To: AMSAT -BB
> Subject: Re: [amsat-bb] Doppler adjustment proper procedure question
>
> The ARRL can't even get frequencies correct so it's no surprise they are
> wrong about which frequency to adjust.
>
>  If you aren't using computer control to be able to adjust uplink and
> downlink you adjust the higher of the two frequencies.
>
> Dave-KB1PVH
>
>
> Sent from my Galaxy S9
>
> On Fri, Jun 21, 2019, 3:05 PM AI9IN via AMSAT-BB <amsat-bb at amsat.org> wrote:
>
>> On the official ARRL VHF/UHF info sheet
>> (
>>
> http://www.arrl.org/files/file/Field-Day/2019/2019%20Above%2030%20MHz%20-%20
> Rev%20A.pdf
>> )
>>  they suggest that for satellite QSOs operators should only adjust their
>> receive frequency regardless of whether it is VHF or UHF. I thought
>> standard procedure was to adjust the higher frequency whether it is
>> transmit or receive.
>>
>> Steve AI9IN
>> _______________________________________________
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
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> AMSAT-NA.
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions expressed
> are solely those of the author, and do not reflect the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb