[1000mp] FT1000MP Key Clicks

Fri, 27 Dec 2002 08:07:07 -0700

Jaakko,

It looks like our results are very similar.  I didn't bring a spectrum
analyzer home from work, so I don't have any spectrum plots.  But my scope
waveforms seem very similar to yours.  I have attached them as JPG files to
this email message.  I would love to hear any comments you have about them.

Did you leave the W8JI key click mod installed in your MP, even though it
has this first-dit quirk?  If you find any circuit change that helps the
first-dit problem, I would love to hear about it.

Thanks, and 73,
Tom / W7GT

----- Original Message -----
From: "Jaakko" <[email protected]>
To: <[email protected]>
Sent: Friday, December 27, 2002 1:40 AM
Subject: Re: [1000mp] FT1000MP Key Clicks

> 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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>
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