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Re: AO-40 EIRP? & Millicom results



I put my Millicom down converter on the bench and found the converted
frequency to be only 5 khz high.  The gain also came in at 26 db.  The only
thing I wasn't able to measure was the noise.  I was using an unfamiliar
spectrum analyzer and couldn't find the video bandwidth control to get the
bandwidth narrow enough to measure below -100 dbm.  I did notice that the
noise level on my 2m receiver goes up about what I would expect when
connected to the converter so I'm inclined to think it is OK.  I guess my
next check will be to try some passes from a quiet location with fewer
obstructions around.

I'm still hunting for an EIRP value for the current AO-40 configuration.

Lee-KU4OS

----- Original Message -----
From: "Lee" <lee-fl@cfl.rr.com>
To: <amsat-bb@AMSAT.Org>
Sent: Monday, April 02, 2001 22:17 PM
Subject: [amsat-bb] AO-40 EIRP?


> I've searched the AMSAT-NA and UK sites and can't seem to come up with the
> actual RF output of the S-band transmitter.  I did find a reference which
> quoted a power "dissipation" of 50w but no RF power.  I was also looking
for
> the gain of the small helix currently in use but the only antenna gain
> figures I could find were for the high gain antennas.  Could someone point
> me in the right direction?
>
> I'll be putting my Millicom downconverter on the bench at work tomorrow to
> make sure it is alive and get some idea as to the frequency calibration.
> Sunday's AO-40 pass was a complete bust here with a 16 turn helix and the
> downconverter mounted right at the feed.
>
> Thanks,
> Lee-KU4OS
>
> It is hard to imagine a more stupid or more dangerous way of making
> decisions than by putting those
> decisions in the hands of people who pay no price for being wrong.
>  -- Thomas Sowell
>
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>

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