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@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@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 _______________________________________________ Sent via AMSAT-BB@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
Sent via AMSAT-BB@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
Sent via AMSAT-BB@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