Opps. I should have sent this via AMSAT-BB.
Raymond Hoad WA5QGD
-----Original Message----- From: Ray Hoad [mailto:[email protected]] Sent: Thursday, December 29, 2016 13:15 To: 'Devin L. Ganger' [email protected] Subject: RE: [amsat-bb] Mode B operating question...
If you move the higher frequency you will remove more of the Doppler shift. Doppler shift is proportional to frequency, so the higher frequency is responsible for more of the Doppler shift.
A good place to start is on the AMSAT website. Go to www.amsat.org and click on "Satellite Info" > "Station and Operating Hints". Go to the bottom of the page and read "The One True Rule for Doppler Tuning" by Paul Williamson, KB5MU. Paragraph 10 contains the answer to your question. Then read "Bringing the One True Rule of Doppler Tuning into the 21st Century by Alan Biddle, WA4SCA. These are two very good articles on a complex subject.
Ray Hoad WA5QGD Orbital Elements Manager
-----Original Message----- From: AMSAT-BB [mailto:[email protected]] On Behalf Of Devin L. Ganger Sent: Thursday, December 29, 2016 12:07 To: Chad Phillips [email protected]; Paul Stoetzer [email protected] Cc: Amsat BB [email protected] Subject: Re: [amsat-bb] Mode B operating question...
Hope nobody minds a newby breaking in.
What is the theory behind changing the higher frequency, or is it just an operating convention?
Also, what is a good beginning HT to use to work the sats? I have a little Baofeng UV5R variant. My family got me the Elk dual-band log periodic antenna so that is good, but am I screwed with the radio?
Devin Ganger (WA7DLG)
Sent from my Windows 10 phone
From: Chad Phillipsmailto:[email protected] Sent: Thursday, December 29, 2016 8:59 AM To: Paul Stoetzermailto:[email protected] Cc: Amsat BBmailto:[email protected] Subject: Re: [amsat-bb] Mode B operating question...
Thanks guys. That is why I am asking. After this past weekend of operating and a few conversations I noticed something wasn't right. Makes total sense to adjust the higher frequency.
Keep learning every day and every pass!
Chad
Sent from my iPhone
On Dec 29, 2016, at 10:37 AM, Paul Stoetzer [email protected] wrote:
Always tune the highest of the tune frequencies.
On Mode B, tune your transmitter and maintain a constant downlink and on
Mode J, tune your receiver and maintain a constant uplink.
This keeps you from drifting too far and possibly into QSOs of people
using computer control.
Much to my dismay, some literature, including the most recent edition of
the ARRL Operating Manual still include the outdated suggestion to always tune your transmitter.
73,
Paul, N8HM
On Thu, Dec 29, 2016 at 11:10 Chad Phillips [email protected] wrote: I first got on the sats back on AO-13. Seem to me back then when we
operated linear satellites (FO-29, RS's etc) we found ourselves on the receive passband and as the doppler changed we adjusted our transmit freq to make sure we stayed on the receive frequency.
Of course things have changed since then and many use some sort of
satellite tracking software to control the doppler adjustments on the radio. But when you are operating portable what is the proper procedure on the linear sats?
Thanks,
Chad
kg0mw/en13
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_______________________________________________ Sent via [email protected]. 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: http://www.amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via [email protected]. 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: http://www.amsat.org/mailman/listinfo/amsat-bb