[1000mp] FT1000MP Key Clicks on first element DO Matter

Mon, 30 Dec 2002 07:34:56 -0700

Since I may have started this MP first-dit discussion, I"ll go with Barry --
my money is on the MP being the culprit.

I hope some talented EE out there will take the challenge to drag out the
schematics and an oscilloscope and try to invent a proper solution to the
keying wave shape problem in the MP.  I read the comment in Tom, W8JI's key
click mod, that he thought his mod was already bordering on being too
difficult.  But I, for one, would have been quite willing to spend more time
on the mod, or perhaps have a more complicated circuit, to have a
first-class keying waveform of which I could feel proud on the air.  A lot
of the work is just in getting ready to do the mod -- opening the MP,
removing connectors and boards, etc.  But I just don't have the equipment,
or maybe the energy, to dig into the MP circuit diagrams and try to invent
the golden fix.  And if the golden fix came from a commercial company (e.g.
Inrad), I'll bet quite a few hams would gladly fork out a few bux for such a
fix.

NOTE:  This message is in no way intended as a dig at either Inrad's or
W8JI's key click mods.  I haven't tried the Inrad mod, but I incorporated
W8JI's, and think what it did was a very good thing, and I will leave it in
my rig.  I just wish there was a mod that went all the way and produced a
crisp, clean waveform on each and every dit.  With this, the otherwise
fabulous MP might not be the subject of so much discussion of being a poor
CW neighbor on the bands.  :)

73, and HNY to all,
Tom / W7GT

----- Original Message -----
From: "Barry N1EU" <[email protected]>
To: <[email protected]>
Sent: Monday, December 30, 2002 5:43 AM
Subject: Re: [1000mp] FT1000MP Key Clicks on first element DO Matter

> I think I've stated this before but I guess I wasn't clear about it.  The
> recording is when I tuned up 800hz to W8FJ's fundamental so you can hear
his
> actual transmitted signal along with the pop/click.  When listening on my
> frequency, 800hz below him, all you hear is that pop/click of the first
> element and his fundamental is completely outside of the 500hz filter
> passband.  I think this is causing confusion when folks listen to the
> recording.  It is NOT an AGC problem, and his fundamental received signal
> was not overly strong.
>
> However, W8FJ was wondering if there is a problem with his amp switching
> which might be causing the first element pop/click, rather than his MP's
> keying waveform so yes, that is a possibility.
>
> 73,
> Barry N1EU
>
> >From: lhlousek <[email protected]>
> >Reply-To: [email protected]
> >To: [email protected]
> >Subject: [1000mp] FT1000MP Key Clicks on first element DO Matter
> >Date: Sun, 29 Dec 2002 19:27:46 -0800
> >
> >Barry,
> >
> >What you recorded sounds like some other problem than the usual key click
> >problem.  I've heard many MPs on the air and
> >none ever sounded like that.  It sounds more like an AGC problem in the
RX
> >or a ALC problem in the TX, or maybe in the
> >amp if he was using one.  The normal keyclick problem due to fast rise
and
> >fill times causes excessive bandwidth, not
> >popping,  and really isn't heard when listening to the signal.  It is
heard
> >more plainly when tuned above or below the
> >signal far enough that it is outside of the bandpass of the selected
> >filter.
> >
> >Lou W7DZN
> >
> >
>
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