[Elecraft] K3 MCU 4.17 (APF beta) kills SSB output?

[Philippe Trottet]

After many tries, on Dummy load first then with distant Ham friends, conclusion was to re-installed MCU 4.14.
Instead of giving the same dynamic with the MH2 microphone, with my Amp on, using 12w drive, using Mic=2 COMP=20, pronouncing the number 6 slowly, I have seen immediately the difference. 
For me, using a Amp w/GU84B tetrode, 12w drive on ssb give 500~600w on normal voice operation. 
With MCU 4.17 it gave only 300~400w and the power increase with difficulty on a single whistle to 500w. and when I pushed to maxi drive 65~70w I was unable to achieve the normal 64dBm+ of the Amp with normal voice. 
Normal cw tune procedure seems not affected and I can achieve the maxi as normal.
 
The most important: 
It has been reported to me during the test on the air, some alteration of the modulation, like a RFI ground phenomena on the microphone or like a under voltage problem during transmitting.
I've checked all connections from A to Z and no problem founded. re-load 4.17, installed it 2 times, with no changes.
When re-installing the MCU 4.14 everything is back to normal with the very clear voice provided by the K3.
Sure Wayne will share with us what's happened, .APF is a so great add-up in weak signal environment !
Bst 73's
Philippe A65BI

>>> Tim Tucker <ae6lx at worldwidedx.com> 05-11-2010 20:02 >>>
I have the same experience that Philippe has.  I thought I had one or both
3cx800A7 tubes  going flat in my amp when I had to increase the drive to a
level I never have been close to approaching to get 1KW out.

It's great to hear that you guys are on this new glitch so quickly.

Tim

On Thu, Nov 4, 2010 at 9:54 PM, Wayne Burdick <n6kr at elecraft.com> wrote:

> We're working on the SSB problem.
>
> 73,
> Wayne
> N6KR
>
> On Nov 4, 2010, at 9:49 PM, Philippe Trottet wrote:
>
> > Same thing to me, I was noticed it when put my Amp w/GU84B on, need
> > 20w+ to obtain 500w in ssb instead of my normal 16w...
>
>
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