[TenTec] OMNI D ser B low power output--still no joy

[scottsheppard at videotron.ca]

Well,

I am still not getting much power out of the omni...so far I have disconnected the input to the PA and measured direct out from the Low Level Driver (LLD)...almost nothing to measure even on the 5 watt scale...yet, when going thru the PA and adjusting the final PA bias on the control board, I can get close to 4 watts which seems to indicate the PA is taking the very very low input and bringing it up to that level...problem is I am drawing about 8 amps to get 4 watts!

I tried replacing the mrf476 on the LLD with an equiv 2166  and no diff...I also replaced the two other transistors on the LLD with a 2n3503 (or similar)...no difference.

I even went further back to the OT board (the stage before the LLD) and swapped out those transistors...no change at all.

When I transmit into a dummy load for a few seconds the transistors on the low level driver do get warm, yet I again, cant measure anything really from the LLD output...

Any suggestions? I am thinking perhaps switching out the diodes on the LLD next but I am really taking a shotgun approach here. As always, your collective wisdom/comments are welcome...If TEN-TEC has time perhaps they can shed some light as well next week. 

scott va3ied