Re: [amsat-bb] AO-40 receive freqs

[Bill Howell <bhowell@xxxxxxxxxxxxxxx>]

Yes, I'd like to see some pictures when you get a chance. What's the URL?

I also got an AIDC unit. I tried putting it on a Meyers dish (similar to the Phillips, I believe.
The Meyers seems to need about 15 inches from the back of dish, to the dipole.

Unfortunately the AIDC is only long enough to give a 10 inch distance from dish face to dipole.
I guess I'll need to modify the bracket which holds the AIDC.

Were you able to get the required 15 inches on your Phillips installation?

As to frequency, I believe that 123.xxx is correct (don't have the .xxx specific here at work).




>I'm  kinda in the bag this morning because I stayed up to
>try my new AIDC-3733 converter on the late AO-40 pass last
>night (East Coast USA).
>
>Unfortunately, I didn't hear anything, so in pondering the
>myriad of variables, I thought I would poll the collected
>knowledge here on the BB and try to nail down some of them.
>
>So first, for an unmodified 3733, where should I look for
>the receive signal (let's ignore doppler for the moment).
>I've seen both 123 and 125 Mhz mentioned as the downconvert
>from 2401 Mhz. Which is right? What would be my base receive
>freq for the beacon before applying doppler correction?
>
>Now doppler. Winorbit showed something like -25Khz. It
>sounds right to me but thought I would ask anyway.
>
>Finally, a couple of lessons learned (by me). RTFM! I was
>powering the converter from my FT-847 which puts 12V on the
>antenna port when you set the proper menu configuration for
>VHF Ant, AND you turn on the RF Amp from the front panel. So
>that's the first lesson learned -- thanks Bernie K3BAZ. The
>second lesson was that the 3733 has a 12V regulator, so
>sending 12V to it isn't going to cut it. If only I hadn't
>misplaced the info sheet... Time to make a bias tee.
>
>FYI for all those who ordered DEM converters -- ours came
>yesterday, so they are shipping now. I'll try mine in the
>next couple of days. I think they will work on the 12V from
>the 847 because they use a 9V regulator. I have two
>Philips-Tech SPG-36 parabolic grid antennas. I replaced the
>feed assembly on one of them with the 3733. Took some
>digital pictures which I'll put up on my web site tonight.
>Very neat installation. So, with both antennas mounted on
>either side of the rotator, I should be able to do a pretty
>good comparison of the two units. Stay tuned.
>
>By the way, Sam at Philips-Tech (
>http://www.philips-tech.com/main.asp?page=page6.asp ) tells
>me the focal length of the SPG-36 is 15 inches. (He also
>mentioned that they have plenty of stock now.)
>
>In any case, any other pointers you all can provide WRT
>working AO-40 would be greatly appreciated.
>
>Tnx and 73,
>Art N3OY
>
>
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-- 

Bill Howell
University of Texas at Austin
College of Fine Arts
Office of Computing Technologies
N5ALO  Amsat 32459  QRP-L 415
	
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