Doppler adjustment proper procedure question
On the official ARRL VHF/UHF info sheet (http://www.arrl.org/files/file/Field-Day/2019/2019%20Above%2030%20MHz%20-%20...) 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
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... ) 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
Steve, Take a look at this article: https://www.amsat.org/wordpress/wp-content/uploads/2015/02/FDT-WA4SCA.pdf 73, Adrian AA5UK
On Friday, June 21, 2019, 2:13:00 PM CDT, Dave Webb KB1PVH via AMSAT-BB amsat-bb@amsat.org wrote:
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... ) 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
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
Because I find it extremely laughable that they are supposed to be the Grand Wizard of all Ham Radio and they can't give correct info on satellites, but I'm supposed to rely on them to defend my interests in radio?
I understand satellites are a small niche, but come on...if you don't know what you are talking about just point people to AMSAT. It was noted a couple weeks ago on one of their posts that info was incorrect but apparently they didn't feel the need to correct it.
Dave-KB1PVH
Sent from my Galaxy S9
On Fri, Jun 21, 2019, 8:34 PM Ted Krempa k7trkradio@charter.net 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 http://www.arrl.org/files/file/Field-Day/2019/2019%20Above%2030%20MHz%20-%20Rev%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
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
participants (5)
-
Adrian Engele -
Dave Webb KB1PVH -
Greg D -
skristof＠etczone.com -
Ted Krempa