RE: [amsat-bb] Satellite Demo Audio Box

["Rick Allnutt" <ws8g@xxxxxxxxxxx>]

Yes the audio will be lower, the amount of audio you have available will 
determine if it is enough.  It has worked with my FT-847 mono speaker which 
has a LOT of audio available.  It also works for my Icom dual band handheld.

By the way, only 3 plugs are draining current, the fourth plug is the source 
of audio current!

I have no doubt that a more complicated version could be designed, with an 
amplifier, volume controls, etc.  My post is just a very simple and perhaps 
elegant solution to demonstrating the birds without feedback.

Vry 73 de WS8G(Rick)


>From: Jamie Hutches <kd5gob@ipa.net>
>To: "'amsat-bb@AMSAT.Org'" <amsat-bb@AMSAT.Org>
>Subject: RE: [amsat-bb] Satellite Demo Audio Box
>Date: Fri, 30 Jun 2000 13:44:49 -0500
>
>Yes that is a great idea, but doesn't that cut down the audio sound level 
>for each added connection?
>I use a stereo headphone splitter on trips so my friend can listen to my CD 
>player. With another headphones plugged in you volume is decreased.. If you 
>had 4 things all plugged into one wouldn't the level be too low?
>
>Jamie, KD5GOB
>
>-----Original Message-----
>From:	Rick Allnutt [SMTP:ws8g@hotmail.com]
>Sent:	Friday, June 30, 2000 12:34 PM
>To:	amsat-bb@AMSAT.Org
>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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