I also noticed a lot of "warbling" on the AO-7 stations I heard. I'm assuming this is the "FM'ing" I've read about. I cranked my power down to about 10 Watts on the AO-7 passes I tried to work, and my downlink sounded "OK", but some guys had a very 'watery' sound. I also noticed a couple of sats where the downlink seemed to "drop out" after I heard some very LOUD stations on them. I don't think it was receive blockage causing me to lose the signal, but it was something I never heard before. Jim
--- On Sun, 6/28/09, n3tl@bellsouth.net n3tl@bellsouth.net wrote:
From: n3tl@bellsouth.net n3tl@bellsouth.net Subject: [amsat-bb] Re: Advice for transponder ops To: "Andrew Glasbrenner" glasbrenner@mindspring.com, amsat-bb@amsat.org Date: Sunday, June 28, 2009, 8:45 AM
AMEN brother!
I called CQ multiple times on AO-7 in CW last night between 145.940 and 145.944 (downlink), and NOBODY was tuning down that far. I found that very disappointing, as I did the close proximity of all the stations on FO-29 and VO-52.
I believe a lot of us could have made a lot more contacts on the linear satellites if we'd just used the passband.
Thanks for this post Drew!
73 to all,
Tim - N3TL -------------- Original message from "Andrew Glasbrenner" glasbrenner@mindspring.com: --------------
I took this screen grab of this morning's eastern FO-29 pass, and what it shows is in my opinion very illustrative of a problem that is getting worse even on days other than Field Day.
http://i139.photobucket.com/albums/q305/glasbrenner/radio/FO-29FDanotated.jp...
Spread out! There is no good reason that we should have a dozen operators fighting over the center 15 kHz of a 100 kHz wide transponder. Remember the gentlemen's agreement is the lower third is for CW, middle 1/3 is for mixed ops, and the upper 1/3 is for SSB. There is nothing magic about the Doppler shift at the very center of the passband that simple addition and subtraction can't duplicate elsewhere.
Just my opinion, and please take it constructively.
73, Drew KO4MA
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
Indeed. Some folks, especially on FD weekend, are a little fuzzy on the concept of "linear," aka "Zero sum game." Still, it is amazing what we were able to get out of the old bird.
Alan WA4SCA
AO-7 was about as busy last night as I've ever heard it. CW all over the bottom half of the passband, SSB in the upper half, lots of both coming through very loud. Everything was pumping up and down and left and right with the strain of all that RF being aimed at it. The beacon sounded a lot like the one on Compass. All things considered, I think our grand old lady performed very well.
I managed to snag my satellite QSO for Field day on AO-7. My "plan" was to use AO-51 L/U, as I'd probably have a fair chance of getting through. Fewer stations competing for the L-band uplink, went the theory. Well, in practice, the competition was ZERO. After figuring out that the downlink was on .150 instead of .300 (Doh!), I found that I had the satellite all to my self.
Even as bad as the audio was on AO-7, at least one could communicate. In contrast, the VU side of AO-51 was mostly an unproductive zoo.
Greg KO6TH
Date: Sun, 28 Jun 2009 08:51:16 -0700 From: kq6ea@pacbell.net To: glasbrenner@mindspring.com; amsat-bb@amsat.org; n3tl@bellsouth.net Subject: [amsat-bb] Re: Advice for transponder ops
I also noticed a lot of "warbling" on the AO-7 stations I heard. I'm assuming this is the "FM'ing" I've read about. I cranked my power down to about 10 Watts on the AO-7 passes I tried to work, and my downlink sounded "OK", but some guys had a very 'watery' sound. I also noticed a couple of sats where the downlink seemed to "drop out" after I heard some very LOUD stations on them. I don't think it was receive blockage causing me to lose the signal, but it was something I never heard before. Jim
--- On Sun, 6/28/09, n3tl@bellsouth.net n3tl@bellsouth.net wrote:
From: n3tl@bellsouth.net n3tl@bellsouth.net Subject: [amsat-bb] Re: Advice for transponder ops To: "Andrew Glasbrenner" glasbrenner@mindspring.com, amsat-bb@amsat.org Date: Sunday, June 28, 2009, 8:45 AM
AMEN brother!
I called CQ multiple times on AO-7 in CW last night between 145.940 and 145.944 (downlink), and NOBODY was tuning down that far. I found that very disappointing, as I did the close proximity of all the stations on FO-29 and VO-52.
I believe a lot of us could have made a lot more contacts on the linear satellites if we'd just used the passband.
Thanks for this post Drew!
73 to all,
Tim - N3TL -------------- Original message from "Andrew Glasbrenner" glasbrenner@mindspring.com: --------------
I took this screen grab of this morning's eastern FO-29 pass, and what it shows is in my opinion very illustrative of a problem that is getting worse even on days other than Field Day.
http://i139.photobucket.com/albums/q305/glasbrenner/radio/FO-29FDanotated.jp...
Spread out! There is no good reason that we should have a dozen operators fighting over the center 15 kHz of a 100 kHz wide transponder. Remember the gentlemen's agreement is the lower third is for CW, middle 1/3 is for mixed ops, and the upper 1/3 is for SSB. There is nothing magic about the Doppler shift at the very center of the passband that simple addition and subtraction can't duplicate elsewhere.
Just my opinion, and please take it constructively.
73, Drew KO4MA
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 _______________________________________________ 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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participants (3)
-
Alan P. Biddle -
Greg D. -
Jim Jerzycke