Steve -
You should be able to get 100+ Watts output on 10M with the T-4X(any).
I was just explaining the other day to 'someone' the problem of the padder capacitors on the side of
the T-4X. The 10M, (and sometimes even 15M,) padders are at or near minimum capacity for proper
alignment. The result is that there is essentially no tension on the adjustment, meaning that often
just turning the transmitter right side up after alignment is enough shock/vibration to move them
off setting. This is why I always put a drop of fingernail polish on the adjuster heads for 10 and
15M. The rest have plenty of tension and hold just fine. Also, be sure the padder actually
'peaks'. IF the RF Drive is set wrong during alignment it's possible to get to where even minimum
is still too much capacitance. It's touchy to get power up to 29.5 MHz before running out of RF
TUNE range. Unless you NEED power up there, it's best to 'fudge' a bit on the RF TUNE setting to
favor the lower part of the band. Yes, you will have to increase the RF GAIN on 15 and 10M, but as
long as you reach the ALC 'plateau' in TUNE you have enough.
New sylvania 6JB6's should give you 130-135 W on 80, 130W on 40, 120W on 20 and 15, and 100-110W on
10M, all in TUNE. More on CW. Obviously this expects a good 50 ohm load and "accurate" wattmeter.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Steve Wedge wrote:
I suspect I may have either soft driver or final. Just acquired a really nice T-4XB from a
colleague on this reflector and it't a real gem. ten opened today, and I couldn't really get it
over about 60W output. Somehow, I'm thinking this isn't too abnormal and I can get 100W out on 15.
I seem to remember getting more out on my C-Lines in years gone by, but I may
be fantasizing.
Steve Wedge, W1ES/4
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