Curt Nixon <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Thanks Garey:
Yes I remember that is always a bit different in tune..I guess I was
surprised about how different it was. Just for grins I replaced the RF
driver and the mic amp tubes. It is much closer to what I remember now
and I get plenty of drive on SSB as well.
I usually was running into a linear that had a scope built in to give
the trapezoidal monitor wfm. It is hard to tell whats going on without
it although my small rf field meter shows peaks pretty well.
I think its working like it should now. Thanks for the reply.
Curt
KU8L
Garey Barrell wrote:
Garey Barrell <[EMAIL PROTECTED]> made an utterance to the
drakelist gang
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Curt -
Sounds like normal operation. The GAIN pot is two pots, one is the
Mic Gain, and the other varies a DC current applied to the Balanced
Modulator diodes to unbalance it. The Bal Mod must be unbalanced to
allow carrier through which is amplified to generate the CW signal.
The GAIN adjustment in TUNE mode should increase until it reaches the
ALC level, which is usually around 11 o'clock, beyond which the output
no longer increases as you turn the control CW.
On CW, the GAIN adjustment is typically above 12 o'clock, even over to
2-3 o'clock for maximum output.
The meter is pretty well damped, and doesn't follow voice peaks. The
only way to know your output power on SSB is with either a Peak
reading wattmeter, or an oscilloscope. There are a LOT of factors
that affect what the meter will show on voice, typically the meter
shouldn't read much over 100 mA. If you want to get an idea of your
PEAK output, try whistling into the mike at a steady level (on a clear
frequency, PLEASE) and you will see it come near to the 320 mA plate
current and the output meter will show approximately the same output
as it does in TUNE mode.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>
Curt Nixon wrote:
Curt Nixon <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Got another question as I bring my R4A/T4X out of hibernation.
After tuning up, if I use the tune position on the T4 and set the
drive gain, it will be much higher than if I close the key. ie. I
need to use a much higher setting when the T4 is running from the key
instead of in Tune.
I seem to need to run the gain to max to get any kind of output
kicking while in SB also.
Does this sound like the 12Ax7 mic amp going soft or something else?
Thanks
Curt
KU8L
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