SB-104A - Spike in the speaker?

[Jan Eliasson, SM7NDX]

Hello!

I have a spike in the speaker when unkeying the TX in CW mode.

Burst Of RF When PTT Is Released In SSB Mode are described in Service
Bulletin SB-104-80 from December 11, 1978.

--
This burst of RF when the PTT is released can occur on all bands.  Three
causes of this are:

1.  A spike on the audio output of board B caused by the +RX mute voltage
applied to pin 2 of IC201B through R212. The solution is to let IC201B
remain active all the time.  This is done by connecting R212 to ground
instead of Q-205's collector.
--

This fixed the problem in SSB, but what to do in CW?

73 de SM7NDX, Jan

--
Jan och Margareta Eliasson
sm7ndx at ssa.se / sm7udx at ssa.se
http://sm7ndx.navab.net

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