Based on what I can get out on 15, I'm suspecting that I'll need to re-do
the 10 alignment. The previous owner said he rarely used it on 10 and
mostly QRP. The fact I can get 100W+ on 15 suggests I just need to realign
based on what you've said here.
I'm loving a feature that not too many people mention as an advantage of the
B over the T-4X: a separate VOX delay control on the rear apron. This
allows me to get nearly QSK CW - though I've got it set for more of a delay
to save the relay and finals. Still, the T/R changeover on CW certainly is
more like the C-Line.
Thanks for the as-always valuable info.
Steve Wedge, W1ES/4
To be is to do - Socrates
To do is to be - Plato
Do be do be do. - Sinatra
All my computers have my signature with various pearls of wisdom appended
thereto.
--------------------------------------------------
From: "Garey Barrell" <[email protected]>
Sent: Saturday, October 01, 2011 11:13 PM
To: "Steve Wedge" <[email protected]>
Cc: "Drake List" <[email protected]>
Subject: Re: [Drakelist] What's normal 4-line output on 10m?
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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