[Elecraft] K2 CW train of dots when ptt

[Arie Kleingeld PA3A]

Giulio,

Yes, the ptt line of the mic is the same as the dot-paddle. This is one
of the design flaws in the K2. 
Don Wilhelm made a beautiful mod for this, but it is not a simple one.
You can see it on his website.

Over to you Don.


Arie PA3A


-----Oorspronkelijk bericht-----
Van: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] Namens Giulio Pico
Verzonden: zondag 25 mei 2008 18:37
Aan: elecraft at mailman.qth.net
Onderwerp: [Elecraft] K2 CW train of dots when ptt


I made yesterday the mod suggested by Don about having an external PTT
for CW, and a problem came up. After I found the problem I have had a
talk with the K2 owner and he told me that the problem was present even
before the mod ( He wasn't bothered about this because he doesn't go cw
on air... ). Straight to the problem: When I push the new PTT  in CW
mode the radio starts transmitting a train of dots when in iambic mode
(tried A or B, no change) and a fixed note when in straight key mode. On
SSB everything seems to work good, when i press the PTT foot switch the
radio goes tx regularly. I don't use an external keyer, just a bencher
iambic key connected directly with the radio via the stereo jack on the
rear panel. I'm pretty sure about the mod (used a BS170 instead of
2N7000 and a 74HC153 instead 74AC153 but these shouldn't be a problem)
and the confirm of my friend who had this trouble before the mod made me
think about investigate somewhere else. He confirmed to me that when in
CW mode when he pressed the PTT on the mic the radio started
transmitting dots. The key is not operational with the radio in any case
(and wasn't before the mod), neither on test mode. Tried to modify QSK
delay with no success. Something suggest me that the problem could be in
some software configuration i can't find, or in the PTT/DOT coexistence
on the same pin of the key socket.

Any Idea????

TNX and 73 de Giulio IW3HVB

--
Follow the path of the Prophets...
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