Hello My AO-40 (sobsob) techniques are really rusty. I am trying to find AO-51 S band downlink. I forget the conversion frequency on a 3731aa downconverter to the two meter band. With the pass duration I don't have a lot of time to look, which I did. Anyone aim me to the correct frequency? 73 Bob W7LRD
-- "if this were easy, everyone would be doing it"
Hi Bob,
I think the 3731's LO is at 2256, so subtract that from the 2401.200 +/- downlink frequency. You should get something around 145.200. Doppler will shift that +/- about 50 kHz, and then you need to factor in your own unit's offset (my modified Drake is off by about another 50 kHz).
I wish you had it running earlier today. I had the satellite all to myself during the 7:30pm PDT pass.
Greg KO6TH
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From: w7lrd@comcast.net To: AMSAT-BB@amsat.org Date: Sun, 17 Aug 2008 04:31:06 +0000 Subject: [amsat-bb] Rusty AO-40
Hello My AO-40 (sobsob) techniques are really rusty. I am trying to find AO-51 S band downlink. I forget the conversion frequency on a 3731aa downconverter to the two meter band. With the pass duration I don't have a lot of time to look, which I did. Anyone aim me to the correct frequency? 73 Bob W7LRD
-- "if this were easy, everyone would be doing it" _______________________________________________ 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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Greg D. wrote:
Hi Bob,
I think the 3731's LO is at 2256, so subtract that from the 2401.200 +/- downlink frequency. You should get something around 145.200. Doppler will shift that +/- about 50 kHz, and then you need to factor in your own unit's offset (my modified Drake is off by about another 50 kHz).
I wish you had it running earlier today. I had the satellite all to myself during the 7:30pm PDT pass.
Greg KO6TH
From: w7lrd@comcast.net To: AMSAT-BB@amsat.org Date: Sun, 17 Aug 2008 04:31:06 +0000 Subject: [amsat-bb] Rusty AO-40
Hello My AO-40 (sobsob) techniques are really rusty. I am trying to find AO-51 S band downlink. I forget the conversion frequency on a 3731aa downconverter to the two meter band. With the pass duration I don't have a lot of time to look, which I did. Anyone aim me to the correct frequency? 73 Bob W7LRD
-- "if this were easy, everyone would be doing it" _______________________________________________ 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
Get thousands of games on your PC, your mobile phone, and the web with Windows®. http://clk.atdmt.com/MRT/go/108588800/direct/01/ _______________________________________________ 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
Yes, I agree. The 3731, if it was modified for 2 meters, output is 145.200 plus/minus doppler. Here on the East coast...I had a nice QSO with a VE3 and K5 with the satellite without anyone else. I had blown my original K5GNA unit as I transmitted into it with my Icom 910. I had a spare-Mr. Murphy planning. Thanks to the AO-51 crew for putting a few days of 2.4 so we can test out units for future ops(Hopefully!!??!!) 73, Dee, NB2F P.S. Get over AO-40 already---I miss it too but.... Let's keep on the BOD to do the right stuff!!??!!
participants (3)
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Dee -
Greg D. -
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