[Motorola] MOTRAN base/rptr

Mon, 18 Mar 2002 22:27:03 -0600

ok...but doesnt it still sound like the signal is a bit strong?  (covers 
on, outside the room....half strength 15 or 20 feet away)

At 04:23 AM 3/19/2002 +0000, you wrote:
> > 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
>
>
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      //////////////////////////////////////////////////////
     //        Kenneth R. Cechura, KC9UMR                //
    //             [email protected]                     //
   //           President, W0EEE, 2002                 //
  // University of Missouri-Rolla Amateur Radio Club  //
//////////////////////////////////////////////////////