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

Thu, 18 Mar 2004 19:30:00 -0800

Read it a little closer.....
Para 5.9 step A 
"connect PTT line to GROUND  at mike jack"

The tx must be keyed before anything will happen.

Regards

Dave Harmon
NSRCA 586
K6XYZ[at]comcast[dot]net
Torrance, Ca.

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of [email protected]
Sent: Thursday, March 18, 2004 6:48 PM
To: [email protected]
Subject: [Drake] T4XC Carrier Oscillator, Filter Match, Mod Bal adj

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
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