AMSAT shows downlink at 436.795
AO27 site shows downlink at 436.797
What is the correct frequency?
I find that 436.795 works best for me. But it's an FM downlink (so you have the capture effect on your side), you've got Doppler to deal with, and every rig is different anyway. So I'd advise that you just play with it a bit and see what's best for you. Either one is a reasonable starting point.
Greg KO6TH
From: k7trkradio@charter.net To: amsat-bb@amsat.org Date: Sun, 25 Apr 2010 10:06:22 -0700 Subject: [amsat-bb] AO 27 ?
AMSAT shows downlink at 436.795
AO27 site shows downlink at 436.797
What is the correct frequency?
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
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I start at 436.805 which seems about right for the doppler shift at the beginning of the pass.
73s John AA5JG
--- On Sun, 4/25/10, Greg D. ko6th_greg@hotmail.com wrote:
From: Greg D. ko6th_greg@hotmail.com Subject: [amsat-bb] Re: AO 27 ? To: k7trkradio@charter.net, amsat-bb@amsat.org Date: Sunday, April 25, 2010, 12:52 PM
I find that 436.795 works best for me. But it's an FM downlink (so you have the capture effect on your side), you've got Doppler to deal with, and every rig is different anyway. So I'd advise that you just play with it a bit and see what's best for you. Either one is a reasonable starting point.
Greg KO6TH
From: k7trkradio@charter.net To: amsat-bb@amsat.org Date: Sun, 25 Apr 2010 10:06:22 -0700 Subject: [amsat-bb] AO 27 ?
AMSAT shows downlink at 436.795
AO27 site shows downlink at 436.797
What is the correct frequency?
Sent via AMSAT-BB@amsat.org.
Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the
amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_________________________________________________________________ Hotmail is redefining busy with tools for the New Busy. Get more from your inbox. http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:W... _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Hi All,
I read all the replies and have to agree with John, AA5AG. Unless the pass is real low to the east or west, I always get AOS at 436.804, then track down in frequency. My LOS is around 436.785, if your fixed in 5kc increments (no vfo), program or move from 436.805, 436.800, 436.795, 436.790 and 436.785. The 436.795 frequency is the center frequency before doppler comes into play.
Hope this helps,
Rick WA4NVM
I start at 436.805 which seems about right for the doppler shift at the beginning of the pass.
73s John AA5JG
--- On Sun, 4/25/10, Greg D. ko6th_greg@hotmail.com wrote:
From: Greg D. ko6th_greg@hotmail.com Subject: [amsat-bb] Re: AO 27 ? To: k7trkradio@charter.net, amsat-bb@amsat.org Date: Sunday, April 25, 2010, 12:52 PM
I find that 436.795 works best for me. But it's an FM downlink (so you have the capture effect on your side), you've got Doppler to deal with, and every rig is different anyway. So I'd advise that you just play with it a bit and see what's best for you. Either one is a reasonable starting point.
Greg KO6TH
From: k7trkradio@charter.net To: amsat-bb@amsat.org Date: Sun, 25 Apr 2010 10:06:22 -0700 Subject: [amsat-bb] AO 27 ?
AMSAT shows downlink at 436.795
AO27 site shows downlink at 436.797
What is the correct frequency?
Sent via AMSAT-BB@amsat.org.
Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the
amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Hotmail is redefining busy with tools for the New Busy. Get more from your inbox. http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:W... _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Ted wrote:
AMSAT shows downlink at 436.795
AO27 site shows downlink at 436.797
What is the correct frequency?
The difference is "in the noise". It's an FM downlink, so either or both are close enough to hear it, and the difference may be as much as your receiver is off frequency. Pick either and adjust for best results on your individual receiver.
73, Drew KO4MA
I split the difference and plugged 436.796 into the Doppler.SQF file for SatPC32, but I also use the AFC on my 910H, so it really doesn't matter - the software takes care of the doppler error, and the AFC takes care of any error in the actual satellite frequency.
George, KA3HSW
----- Original Message ----- From: "Ted" k7trkradio@charter.net To: amsat-bb@amsat.org Sent: Sunday, April 25, 2010 12:06 PM Subject: [amsat-bb] AO 27 ?
AMSAT shows downlink at 436.795
AO27 site shows downlink at 436.797
What is the correct frequency?
participants (6)
-
Andrew Glasbrenner -
George Henry -
Greg D. -
John Geiger -
Rick - WA4NVM -
Ted