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Re: Satellite Demo Audio Box



For the satellite special event station at Pacificon we built an audio
distribution system with eight stations.  Each has a set of headphones and
individual volume control (pad).  The audio from the rig goes into a small
audio amp and the output from that goes into the headphone distribution
system.  We were having trouble with the QRM in the room from people talking
and other things going on.  Some of the signals from the birds (AO-10 in
particular) are weak and noisy.  Works pretty good, but we skimped on the
headphones (walkman style for around $1.50 a set at the swapmeet).

73 - JC,k0hps@amsat.org

----- Original Message -----
From: Rick Allnutt <ws8g@hotmail.com>
To: <amsat-bb@AMSAT.Org>
Sent: Friday, June 30, 2000 10:34 AM
Subject: [amsat-bb] Satellite Demo Audio Box


> Gentlepersons,
>
> Many of you have given demonstrations of satellite communications at field
> day, and outside in general, away from your shack.  My first attempt to do
> this failed when I used a speaker for the audio instead of headphones
> because of feedback through the bird.  If I got the speaker far enough
away
> from the microphone to not have feedback, I couldn't hear very well at
all.
>
> For field day, I bought about $2 worth of components: 4 mini female mono
> plugs, a mini mono to mini mono cord, and a small project box).
>
> I simply wired the monoplugs in parallel inside the box.
>
> Now I can use the cord to plug into the mini-mono speaker jack on my
FT-847
> (or my Icom handheld) and to one of the plugs on the box.  I can use one
of
> jacks for a mono headset, and another for a computer speaker.  I can
listen
> with the headphones, and put the speaker far enough away to avoid feedback
> while allowing others to hear the pass.   The last jack can be used to
> record the pass with a tape recorder.
>
> Same idea could be used with stereo plugs using the stereo headphone jack
of
> the FT-847, a set of stereo computer speakers, stereo headphones, and a
> mini-disk recorder.
>
> 73s de WS8G (Rick)
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