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Cross-band APX4500 VHF and APX 6500 UHF

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Berlach

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Dec 6, 2016
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I'm looking to cross-band two mobile radios for inter-ops. I've never actually done this before, so I'm just looking for some guidance. I know I have to connect the two radios through the accessory connector in the back of the radio, but it's very difficult to find the pinout diagram and information.
 

N1GTL

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Jun 14, 2005
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Pin outs start on page 9-3 of the basic service manual.
 

jim202

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Mar 7, 2002
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New Orleans region
There are a couple of things to bear in your mind working with Motorola radios. The first is that there is a filtered audio output generally available that has a fixed audio level not controlled by the radio volume control.

The second is that normally the mic audio in line and the RX audio fixed output line both have a DC bias voltage on them. This needs to be taken into consideration with any interface circuitry you plan to use. The best way is to control this is about a slam dunk with some effort.

Don't forget you will need a ground connection and the external mic connection on the radio. I tend not to use any AGC connection setting. This only trends to build up the background noise.

Your interface should contain some sort of a TX time out timer or program the radios to time out after say 2 minutes. It should also have a way of adjusting the audio throughput. This way you can control the audio level coming out of the receive audio and feeding the TX.
 

dfc2

Newbie
Joined
Dec 7, 2001
Messages
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Any luck?

I am trying to set up an emergency repeater for one of the inter op freqs. (800). have you had any luck? im looking for some guidance.

DFC2
 
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