[Drake] T4XC Carrier Oscillator, Filter Match, Mod Bal adj

[email protected] [email protected]
Thu, 18 Mar 2004 21:48:09 EST


I had very little luck following the procedure in the manual for setting 
carrier oscillator, filter match, and modulator balance.  I wonder if there is an 
alternate procedure.

My experience:  I checked my carrier oscillator and discovered it was nearly 
100 Hz off.  I decided to follow the alignment procedure, sec 5.9 in my 
manual.  Step 1:  set carrier balance full CCW. Step 2: Adjust carrier osc trimmer 
(C6) to increase plate current to .1 Amp.  No matter how much I tweaked C6 the 
plate current didn't budge.  The carrier oscillator frequency was moving 
according to my frequency counter but the plate current was not changing.  I should 
have stopped there.  Instead I tweaked transformers T14, T2, T3 hoping to see 
a peak in plate current as the manual said I would.  No change.  Now 
everything was out of whack. To get it running again for a sched, I put the carrier 
oscillator on frequency fired it up in Tune, tweaked the transformers for peak 
output then set the carrier balance for lowest S meter reading on a nearby 
receiver.  This has got to be wrong but the transmitter at least talks.   

Does someone have a procedure that works better than the one in the book?

Thanks,

Jon, K6JEK