The Satellite Mode found in older rigs is a blast from the past. Specifically P3 birds like AO-10 and AO-13. It depended on the Doppler shift being relatively constant (but not necessarily small) over a reasonable period of time. You could sync your uplink and downlink, and then tune around with the uplink automatically correcting. Over much of the P3 orbit you only needed to resync every 15-20 minutes or more. By comparison, with LEO birds the Doppler shift changes fairly rapidly throughout most of the pass, thus invalidating the basic assumption of the integral Satellite Mode. Fortunately software such as SatPC32 and MacDoppler will work for any orbit. Lacking that, or when operating a satellite such as AO-73 where the LO drifts a bit, purely manual tuning is more of a necessity than an option.
73s,
Alan WA4SCA
<-----Original Message----- <From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Jeff Moore <Sent: Tuesday, March 29, 2016 1:34 PM <To: Amsat BB AMSAT-BB@amsat.org <Subject: Re: [amsat-bb] Is it me? < <I thought the TS-2000 had all the doppler correction built in. Why aren't <you using that since your laptop isn't attached to the radio???? < <Jeff Moore -- KE7ACY < < < <On Mon, Mar 28, 2016 at 8:41 PM, Rick Tejera saguaroastro@cox.net wrote: < <> All, <> <> <> <> While planning upgrades to the shack, I've decided to try my hand at the <> linear birds again, taking myb TS-2000 outside and operating Semi portable. <> So far it has been a lesson in frustration. I've yet to find my downlink. <> Tonight I tried to get on XW-2C on the 0100UT pass which was 70 degrees <> from <> DM33. <> <> <> <> First let me describe how I set up. (I finally solved the memory storage <> issue I wrote about a few weeks ago). basically it's just the radio into an <> ELK on my equatorial tripod mount and the laptop (Still waiting for the <> USB-->Serial converter to get SATPC 32 talking to the radio). <> <> So I started at the center of the passband and using the doppler <> corrections <> in SAtPC, tuned the UHF uplink down to where Sat POC said it would hear at <> the sat and moved around bit trying to hear myself. Kept adjusting the <> uplink and also played with the other way Calling CQ on the uplink and <> moving the downlink trying to find myself.self Didn't hear jack the whole <> pass. <> <> <> <> I did record the pass and thought I might have heard myself, but it was <> toow <> eak to discern my call or grid, (though it did kinda sound like me). <> <> <> <> So, I guess I have two questions: <> <> <> <> 1) Is my methodology correct? if not what am I doing wrong? <> <> 2) Did anyone hear me? <> <> <> <> I'm hoping once I get the Cable and SATPC talking to the radio, it might <> make it easier, but I think knowing how to do this manually should be <> skillset i should have. <> <> <> <> Thanks in advance. <> <> <> <> <> <> Rick Tejera (K7TEJ) <> <> Saguaro Astronomy Club <> <> www.saguaroastro.org <> <> Thunderbird Radio Club <> <> www.w7tbc.org <> <> 623-572-0713 <> <> 623-203-4121 (cell) <> <> SaguaroAstro@cox.net <> <> <> <> _______________________________________________ <> 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: http://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: http://www.amsat.org/mailman/listinfo/amsat-bb