[App_rpt-users] Interfacing Radios

Steve Mahler kizzy at lusfiber.net
Mon Sep 28 13:24:29 EDT 2015

Good Day!  I am looking for proven working interface wiring and signal 
trimming to interface a single URIx to two different radios. I need to 
interface a cross-band repeater to a URIx. [I have two URIx's.  If fully 
connection two radios has advantages or is easier please explain.]

The receiver side is a Yaesu/Vertex VX 2100.  I don't see a 
discriminator out, so maybe just AF Out on pin 2.  I don't see a 
PL/CTCSS/COR/COS out, so manipulation of the RSSI on pin 5, maybe? It 
looks like you can program some output general purpose pins on the 
radio, but I have not found a list of those capabilities.  Would 
appreciate interconnect information from anyone using this radio with an 

The transmitter side is a Yeasu/Vertex VXR-9000.  It has AF input on pin 
3 and PL input on pin 4. The external PTT on pin 12 seems straight 
forward.  I would appreciate confirmation of a working interconnection 
to a URIx.

All pointers appreciated.
...STeve - KF5VH

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