[TenTec] Orion 1 SWR

[Jeff (W4DD)]

Wondering if anyone has run across an Orion 1 with SWR that remains at 1.7,
even running into a 50 Ohm dummy load.  The problem appears to be on the CPU
board, not on the filter board or IF board.

 

In TUNE Mode (25W):

V_Fwd = 1.2V

V_Ref = .14V 

 

I can ground the V_Reflected line prior to going into the CPU board (assures
ref power is zero) and the SWR remains at 1.7

 

If I ground the V_Ref line at the A to D converter, the SWR goes to 1.0

 

I've done a lot of checking and so far can't seem to determine where that
.14V is coming from.  Ideas appreciated.

 

 

Thanks,

Jeff W4DD