Give full output in CW is now gets complex.
Yeasu never supplies levels, anywhere.
My guesses:
1. Audio board capacitors, level out to IF board low..
2. IF filter cocked up, were you able to set the CAR OFFSETS for
USB and LSB?
3. Is there any difference with speech amp on of off? That is
another stage before the driver board.
Good luck,
Randy W7CPA
On 8/29/2021 12:01 PM, n3kcb via
groups.io wrote:
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Rex,
Yes, I have tried a peak reading wattmeter and verified that I do
not get more than about 15-20 watts peak when speaking about 3
inches from the mic (mic gain at max). With mic gain controls at
maximum, I need to whistle sharply into the microphone with it
directly in front of my mouth to get full power out. I have
checked using the Heath HM-2140 in PEP and average modes and the
W-4. All will show 100+ out if I whistle directly into it with no
clearance at the mic. I would expect a sharp whistle at a few
inches with microphone gain at a mid setting to produce full power
(or close to it). It acts as though I have a bad mic, but I have
tried a half dozen known good microphones and they are all the
same. The original Yaesu mic is actually a little better than the
rest.
The radio has no problem producing the power in CW. In fact, It
does not require more than 50-60% drive to achieve full power. I
am fairly confident that I do not have a gain issue in the
remainder of the TX chain.
