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Interface product for back to back radios

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RFguy
Posts: 1278
Joined: Wed Dec 21, 2005 6:17 am

Interface product for back to back radios

Postby RFguy » Thu Aug 31, 2017 9:15 pm

Not sure what section to put this in, so I just put it in the general area.

I need to patch a simplex analog channel to a talkgroup on a MOTOTRBO Capacity+ system.

It's only occasional use so I'm looking at using 2 mobiles with some type of bi-directional interface. Ideally it would have some voice delay (1/4 to 1/2 second). More delay needed for the simplex analog to the Cap+ system than the Cap+ to simplex system.

What I'm looking for is an off-the-shelf controller. I can do the interfacing no problem, I just prefer to use a standard controller of some type.

Any suggestions of a controller?

Thanks.

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Bill_G
Posts: 3036
Joined: Thu Sep 17, 2009 5:00 am

Re: Interface product for back to back radios

Postby Bill_G » Fri Sep 01, 2017 3:48 am

Bi-directional controllers are common. It's the delay that isn't. You could put two NXU-2A's back to back using the RX buffer to set your delay timing.

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Bigred
Posts: 93
Joined: Mon Apr 14, 2008 7:08 pm
What radios do you own?: Junk that comes and goes...

Re: Interface product for back to back radios

Postby Bigred » Fri Sep 01, 2017 6:37 am

Or if you want cheaper, go with a RICK or one of the many cables that serve the same purpose. When audio delay is needed I use the RAD board from Arcom. Easy to work with and splice inline.
Lots and lots of watts...

ve3nsv
Posts: 277
Joined: Sat May 27, 2006 8:43 am

Re: Interface product for back to back radios

Postby ve3nsv » Fri Sep 01, 2017 11:16 am

I find the delay on the TRBO vocoder is usually sufficient enough when going from analog to TRBO. I would just go radio to radio and give it a try.

PTT to COR
COR to PTT
TX to RCV
RCV to TX
GND to GND

RFguy
Posts: 1278
Joined: Wed Dec 21, 2005 6:17 am

Re: Interface product for back to back radios

Postby RFguy » Sat Sep 02, 2017 8:26 am

Great info. Thanks.

I think I'll try the simple route first as ve3nsv suggested and see how it works. can always go more complicated as needed.

I did find this product on a Google search:

Bi-directional repeater controller http://www.nhrc.net/nhrc-7/
Audio delay card http://www.nhrc.net/nhrc-dad-2/index.php

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wavetar
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Re: Interface product for back to back radios

Postby wavetar » Thu Sep 14, 2017 8:08 am

I've done a number of direct back to back TRBO-to-other radio set ups and haven't ran across any issues with syllables being cut off, etc. I really like using the XPR mobiles even on the analog side, since you can turn off AGC and control the analog & digital rear accessory mic gains on both sides of the set up to get very good audio levels. Not so good if you leave the AGC on though!
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