Jerry,
We could put an audio isolation transformer between the mic/preamp stages
and the mixer.
The mixer side will need to be ground isolated then Allards CW will work
and probably the carrier leak on SSB will be minimum.
Some thing like these transformers:
I have some isolation transformers, will experiment when I get back
to town next week.
Cheers
Raj
At 01/06/2017, you wrote:
A very nice $0.01 solution.
Except it kills how Allard is doing CW.
He unbalances the carrier by putting 5v into a 10k resistor that goes to
the top of C107.
Maybe fix this PTT pop somehow in microphone preamp so we can continue to
use Allard's CW method?
Could transmit CW like Farhan is doing it on the uBitx:? Move the
VFO to the transmit freq and unbalance the first ring mixer.? Those
three mixer ports got stirred up considerably on the uBitx, though it is
otherwise the same mixer as on the Bitx40.? Is there a some simple
way to do this without a significant hardware hack to the existing Bitx40
boards?
......snip........
Jerry, KE7ER
On Wed, May 31, 2017 at 08:13 pm, Raj vu2zap wrote:
- See my solution:
-
/g/BITX20/topic/ptt_pop_hack/4460108?p=,,,20,0,0,0::Relevance,,PTT+pop+raj,20,2,0,4460108
?
Raj vu2zap