[Elecraft] K3 choppy CW

[W0MU Mike Fatchett]

N1MM users have had similar issues.  I don't know if AB7R's fix works but
many have just gone to a Winkey keyer as a solution.  I have one built into
my SO2R MK2R+ Microham devices so I have never seen this issue. 


"A slip of the foot you may soon recover, but a slip of the tongue you may
never get over." Ben Franklin
-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Robert Mccormack
Sent: Wednesday, February 25, 2009 4:42 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 choppy CW

At ZM1A (multi-two) during the ARRL DX CW contest we received some reports
of "choppy" CW when CT was keying via the 'Key' socket.
Monitoring the signal with a K2 (dummy load in antenna socket) confirmed the
reports.   CW sent using the paddle was normal.
Both 'station one' K3 and 'station two' K3 had the same problem -
substituting a spare K3 made no difference.   BTW, it's not RF getting into
the computer - the keying is just as bad at 5 watts out.

We continued operating, using the K3 memories for CQing and the exchange -
luckily it wasn't a serial number.<G>

I don't know when this "choppy" keying problem started because the K3s are
only keyed by CT during contests, but today we tried a spare 746Pro which
eliminated the problem.

So the problem is specific to our K3s, all of which had  MCU 2.67 installed
plus the 'CW rise time' and RS-232 RF immunity mods in early February...

Anyone else had this problem?

73,
Ken ZL1AIH (ZM1A in contests)



  


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