Re: [amsat-bb] YABSQ (Yet Another Beginner's Stupid Question)

[ahelmfelt@xxxxxxxxxxxx]

Hi all...

There no stupid questions, THERE ARE STUPID ANSWERS........ji





At 10:23 PM 16/08/2001 -0500, you wrote:
>Hello All:
>
>Well, here is YABSQ (Yet Another Beginner's Stupid Question).
>
>First, let me describe my AO40 station:
>
>Andrew 26T-2400-1 Grid (BBQ) Dish Antenna:   24db GAIN
>DEM 13ULNA Preamp: 15db GAIN  .7 NF
>Millicom MC-251R (DRAKE TYPE) Downconverter: 27db. GAIN  3 NF
>Icom 820H Transceiver (assumed NF 13)
>(Distance to antennas is approx. 50 feet using LM400 coax.)
>
>Using the W3PM's AO40.XLS software and plugging in all these figures, it
>shows a relatively good receiving station
>
>In fact, I receive the Middle Beacon with a plus 20 to plus 30 signal level
>on the Icom meter.  Tonight it was varying and fading with a Squint Angle of
>about 34 and cloudy weather.  Using the AO40Rcv software, gives good and bad
>CRC's.
>
>I have been told that this is "about normal."  However, the other night was
>the first time that I was able to receive QSO's, other than just the beacon,
>and they were down in the noise without much audio.
>
>Question:   It seems to me to be a signal-to-noise problem.   If so, what is
>a remedy?  I have a preamp and reasonably good coax.  I realize that a
>better downconverter might help, but that's extra bucks.
>
>In addition, I find the beacon at differing "indicated" frequencies on my
>radio.  I am assuming that this is caused by drift from the downconverter.
>Excluding a dry ice application for stabilization, how may I stabilize the
>drift to be able to determine what the REAL frequency is while operating?  I
>can't  just say that "I think it's 145.xxx, or so!
>
>73,
>Jerry N5GPC
>
>
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>


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