How is this done?

[Moleculo]

Last night someone set up an "echo station" on the airwaves. Whenever you keyed up, about 1 second after you unkeyed, a remote station played back what you said. At first I thought it was just someone who hooked up their radio to a computer and was doing it manually, but it went on for hours. Anybody know how to accomplish this?


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[nomadradio]

I wouldn't mind finding out how. I have my suspicions, but not much more to go on. The only place I've heard this was on 27.095, (11A). Sure had me fooled for a minute or two, until I got the beam pointed to it. Wasn't anywhere around here. Just couldn't figure out who it was with a Browning ping that sounded just like mine. Every time.



Seems to me you would have to have the squelch set just right, to make it key and repeat the receiver audio after you let off the mike. A high noise level, or a lot of bleedover would make this tough, too.



That was what baffled me about the thing. You would think that putting it next to channel 11 would hammer its receiver with bleedover from 11, and nothing else would get through to it.



It does remind me of an idea I had a few years back: the "Internet Watergate". Rather than record a tape, and play it back for everybody to argue about, put a receiver's audio output onto a computer's audio input. Take the audio and put it onto a streaming server, so everybody can log onto it with their browsers and hear how a shoot-out went immediately. It would reduce the delay time between shooting out and the arguments about who they could hear (or couldn't).



Probably wouldn't reduce the arguments.



73

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[Moleculo]

This one was definately done with a radio on the front end because they had it on channel 14 first, then they moved it to 28 where most of the locals hang out at night. There was plenty of people trying to key over each other to see who could be heard on the thing....it primarily picked up the strongest signals, so I think they did have the squelch turned up and the rf gain turned down.



Doing it so there would be no delay between receive and retransmit would be pretty easy if you had two radios and antennas. But this one had about a 1 second delay between the rx and re-transmit. Was pretty cool, actually.


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[Moleculo]

OK Justin, now THAT makes sense. MFJ makes the same exact thing, but it's for VHF/UHF. How do you set it up to work on HF? Got any more of those laying around? That guy that had his set up was WEAK. I need to show him how to do it right..... <img src=http://www.wwdx.org/smilies/posticon24.gif ALT=":lmao">


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[Moleculo]

Darn If you want to cut and paste it over here, then it'll have your name back on it instead of mine...

 

[Moleculo]

Justin, your post was about using an FRS store and forward "repeater" on CB. I found out tonite, that's exactly what it was. I'd like to know how you modified that to work on 27 mhz.

 

[Moleculo]

I see...they're not frequency specific. MFJ has one too. I'd like to find one if these cheap....lots of fun

 

[Captain Kilowatt]

Boy this thread must have missed a few posts. I am assuming that you are talking about what is known as a simplex repeater? They receive and transmit on the same frequency using a digital recorder to record the incoming audio and after the carrier drops from the incoming station it transmits the recorded audio and then resets itself to record again.Pretty neat and can work with most any radio providing a few mods are done to remote PTT the radio and get audio into/out of it.

 

[bandaid kid]

There is a device called a "simplex repeater" where the repeater tranmits what was said by the person immediately after the transmission ends. Don't know if it works on CB, but some hams use it. Several companies market them and I fhink you can find some in QST.

73

 

[theanimalusa]

repeating

Someone had a simplex repeater hooked up to their radio. Rat Shack used to sell them. They can record up to a minute then it retransmits.

- Dave