[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