[amsat-bb] FW: Mode B operating question...

[Ray Hoad]

Opps. I should have sent this via AMSAT-BB.

Raymond Hoad
WA5QGD


-----Original Message-----
From: Ray Hoad [mailto:ray.hoad at mypbmail.com] 
Sent: Thursday, December 29, 2016 13:15
To: 'Devin L. Ganger' <devin at thecabal.org>
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:amsat-bb-bounces at amsat.org] On Behalf Of Devin L.
Ganger
Sent: Thursday, December 29, 2016 12:07
To: Chad Phillips <chad.kg0mw at gmail.com>; Paul Stoetzer <n8hm at arrl.net>
Cc: Amsat BB <amsat-bb at amsat.org>
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 Phillips<mailto:chad.kg0mw at gmail.com>
Sent: Thursday, December 29, 2016 8:59 AM
To: Paul Stoetzer<mailto:n8hm at arrl.net>
Cc: Amsat BB<mailto:amsat-bb at amsat.org>
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 <n8hm at arrl.net> 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 <chad.kg0mw at gmail.com> 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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>>
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>>
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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: http://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________
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: http://www.amsat.org/mailman/listinfo/amsat-bb