[1000mp] FT1000MP Key Clicks

Fri, 27 Dec 2002 10:40:09 +0200

I did recently the same mod and measurements and noticed the same - see
http://wnet.suomi.net/kotisivu/jahla/FT1000MP%20Mark%20V.htm . I did not try
to figure out where the problem comes from. I suspect that it is caused by a
step wise change in biasing point of one or several of the transmitter chain
active elements (amplifier, bal. mixer etc) during the first dit or dah.

Pls. E-mail me your measurement results ([email protected]) -
leave nospam- away.

73, Jaakko oh8nj

----- Original Message -----
From: "Tom Rohlfing" <[email protected]>
To: <[email protected]>
Sent: Friday, December 27, 2002 12:00 AM
Subject: [1000mp] FT1000MP Key Clicks

> Maybe it's not such a good idea to send out a heavy technical question to
> the group on Christmas Eve, because the lack of response was pretty
> surprising.  :)  So I'll just send it out again, hoping to catch a
> sympathetic ear somewhere.
>
> 73,
> Tom / W7GT
>
> --------------------
>
>  Here's a holiday question for the group.
>
>  A few days ago I incorporated the W8JI key-click mod into my MP.  I'm
>  generally happy with the results, and think it did a pretty good job of
>  taming the clicks.  I have before/after Tx output waveform photos for
>  anybody who just HAS to have them.
>
>  So here's the question.  The waveform-softening only works on dots (or
>  dashes) 2-N, but not 1.  So, if I send an "E" it's clicky.  If I send an
> "I"
>  the first dit is clicky, and the second one is nice.  An "S" has a clicky
>  dit, followed by two nice dits.  You get the picture.  But I haven't
> figured
>  out why.  I use an external keyer, and operate the MP in QSK break-in
mode.
>  So how does the MP know the difference between a first dit and a second
> dit?
>  It didn't seem to matter too much what speed my keyer was set to.
>  I don't know if 1) I made an error in the W8JI mod, or if 2) my MP is
> broken and
>  needs repair, or 3) if this is the way the MP is supposed to work with
the
> W8JI
>  mod.
>
>  Has anybody else run into this?  Or has anybody else done the mod and
> carefully measured the Tx waveforms to either confirm or deny what I ended
>  up with?
> >
>  Merry Christmas, Happy New Year, and may there be a new rig under each
> ham's
>  tree!
>
>  73,
>  Tom / W7GT
>
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