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S-Band AO-51 hints



Hi Art,
Sorry to hear you are having troubles with V/S. If I could make a few suggestions.....

Pick a pass that is not right overhead, something to the east or west where you mainly only have to deal with pointing in azimuth.

Take the feed off the dish and connect directly to the downconverter. Still plenty of gain, and easier to hold, and less picky about how accurately you point it.

Use a 2m rig with 5 khz steps to receive. Let the AFC do some of the fine tuning for you, get it +/- 5 and you'll hear it. 

Start out +40 to 50 khz, tune around 15-20 khz while trying to acquire the signal. Know if your downconverter is not spot on or if it requires an offset!

Remember that at Time of Closest Approach you should be right around .200. Doppler really moves here in this part of the curve. 

Remember you only need to tune down once you find it.

If you need to, just twist your wrist during fades. Even "circular" patches and helixes are not perfectly circular.

TREES KILL at 2.4 Ghz. CLear sky is what you need.

Be sure to pick up the right mike or radio when you make your first call, ;-)

I know some of these might sound simple, but I wanted to reiterate them for everyone's benefit. I've been working 51 V/S from my parked truck this week. Downconverter held out the window, HT to receive in my lap, use the rig in the car to TX on. Have made QSOs on passes as low as 8 degrees. You can do it too, I have faith.

73, Drew KO4MA

-----Original Message-----
From: KC6UQH <kc6uqh@cox.net>
Sent: Jun 22, 2005 1:27 AM
To: amsat-bb@amsat.org
Subject: [amsat-bb] S-Band AO-51

I tried my 20" dish, heard a partial call and then lost signal close to the
zenith of the pass. Never found it again. Doing this out in the dark with no
computer, and trying to tune for doppler having drops in the signal while
trying to point the antenna is a hopeless task. It might be fun for a
computer tech who dosn't mind picking out signals from the computer birdes
but it is not for me. I suspect that the S band antenna is mounted on
another corner of the bird that rotates in and out of view causing the loss
of signal.  I will pin my Field day hopes on FO-29 and try for 51 only if I
have nothing else to do.
Art ,KC6UQH
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