Re: [amsat-bb] more tests

[guy lemke <guy@xxxxxxxxxxxx>]

Francesco,
I observed similar signals last night but they were in the 2401.350 to 2401.395
part of the band.  I could not hear the beacon then all the sudden it was their and
very loud.. At 20,000 Km's I had 9 over on my S-meter ( FT-736r).

After acquiring the beacon I could only hear one station out of japan around
2401.375 and two stations using CW around 2401.360. I also heard one station using
voice (english) for a very short period of time calling CQ and then nothing... for
the rest of the pass, also some very deep fades for most of the pass.

I have a ADIC-3733 (3Ft dish) with all the K5GNA mods done to it and it works very
well.. a Yaesu FT-736r for the radio.  My antennas are up about 35 feet with AZ &
EL control (you can see this at www.hamsats.org   under info)..

I hope this helps some..


   guy lemke  kd6mtu

Francesco Messineo wrote:

> Hi all,
> here're the results of new tests I've done trying to hear AO-40.
> My station is in JN53EQ, now I'm quite sure I have good tracking software
> as it gives AZ and EL figures which reasonably agree with those sent to
> me by two other hams. On Aug 1, between 20.30 and 21.30 UTC I wasn't
> able to copy the beacon around the frequency where it's supposed to be
> (yes, plus or minus the doppler shift). I used the 34-turn helix and
> parabolic's downconverter.
> Then I started to point around the sky my antenna and tune around my
> radio. First of all I noticed that the noise floor of the whole
> system is S3-S4 from 144-146 MHz then it rapidly decrease to S1 outside
> this range (tested from 143 to 149 MHz).
> I found "strange" signals  around 147.500 MHz to 148.500 MHz, which
> should be around 2403.500 to 2404.500 according to my converter specifications.
> The signals appear to coming from AZ= 240 to 270 (approx) and EL=30 to 40
> and have been observed for 15-20 minutes around 21.30 UTC (then I went
> QRT). What I heard is signals that sound like SSTV on 2407.968 with S3 to S4
> strength (S1 is the nois floor here), similar signal, around S2, on 2408.055
> also I found a strong (S9) carrier (seems not modulated) around 2408.011.
> For the short period of my observation I couldn't hear any doppler shift.
>
> Now the question is: I'm hearing something that is well known? Or it's
> a product of an image frequency? Can I assume that the LO frequency of
> my dowconverter is reasonably precise (given that they say it should
> convert 2400 MHz frequency to 144 MHz)? How can I test that the LO freq
> is what it should be?
> Has anyone a sample wav file of the AO-40 beacon, just to hear how it should
> sound like?
>
> Thanks and best regards.
>
> --
>
> _ _ _ ___   ___ _ ___ ___   ___ ___ _ _ _   _ _ _ ___ ___   ___ _ _   _
>
> Francesco Messineo      iz5dwf@amsat.org
> _ _   ___ ___ _ _   _ _ _ _ _   ___ _ _   _ ___ ___   _ _ ___ _
>
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