[Motorola] MOTRAN base/rptr

[motorola@mailman.qth.net]

> Question....  Got a MOTRAN base/repeater...  Tx is (based on xtal 
> calculation) 453.175, actual is 453.180 (no big deal)...  Problem is, as 
> soon as we plug it in (granted, its with a crappy antenna) the test 
> receiver being used (Yaesu VX5R or FT847, across the room) opens squelch, 
> as in receives signal....  and I can still hear it on the HT 10 feet away, 
> through a wall...  and this is with the MOTRAN UNKEYED.  when it is keyed 

You didn't say which frequency the signal is radiating on.  I will presume you 
mean the transmit frequency radiates a signal even though unkeyed. What is 
probably happening is that the transmitter channel element is remaining 
energized during the time the unit is in the receive mode.  I haven't looked at 
the UHF Motran base manuals in some time but there should be a way to make sure 
the element only gets energized when the transmitter goes on the air.  There is 
probably some control wiring setup which is energizing both the receive and 
transmit elements continuously for a particular channel instead of just the 
receive one.  In a remote or repeater application, the receiver wouldn't hear 
the transmitter anyway, so it wouldn't matter.  It sounds like just a question 
of tracing out why the transmit element is staying energized.  The UHF models 
may leave the elements energized to increase stability, I can't recall. 

Geoff Fors WB6NVH