[1000mp] Re: MP Clicks

Thu, 31 Jan 2002 02:12:05 -0000

Hi Jaakko -

I'd appreciate if you would e-mail me a set of the pictures.  Thanks!

73,

John  W0DC

----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Tuesday, January 29, 2002 16:05
Subject: Re: [1000mp] Re: MP Clicks

> I measured FT1000MpV keying wave shapes etc. with a spectrum analyzer. The
> rise time from 0->100% is about 2.7ms and decay time is about 1.3ms.
> Interestingly the raising edge of the first dot (or dash) after starting
to
> transmit has even a faster rise time than the consecutive dots - less than
> 1ms. If somebody wants to see them or put them for also others to see I
can
> E-mail the pictures from the spectrum analyzer (4 pcs).  My MpV serial
> number is 0K130039.
>
> Jaakko -oh8nj
> ----- Original Message -----
> From: "Tom Rauch" <[email protected]>
> To: <[email protected]>
> Sent: Tuesday, January 29, 2002 6:19 AM
> Subject: Re: [1000mp] Re: MP Clicks
>
>
> > > look equally heinous." ========== I hope that the ARRL's new equipment
> > > review editor is following this thread.  It's about time that the QST
> > > reviews include CW keying bandwidth (clicks) specs as well as envelope
> > > photos.  Maybe that will cause the manufacturers do something about
> > > the problem.
> >
> > Excellent suggestion!
> >
> > That would have the end-effect of everyone complaining with their
> > wallets.
> >
> > Certainly everything is inside the rigs already to make them click-
> > free, for the most part they just aren't using the parts correctly. The
> > cost would be virtually zero to build the things correctly in the first
> > place, so it has to be because either they don't understand the
> > problem or they don't care.
> >
> > A good first step would be to let Mike Tracy know we WANT an
> > actual meaningful click and thump test...not some barely important
> > first dot or multiple dot waveform.
> >
> > He responded to the request for a meaningful narrow frequency
> > blocking and IM test.....and now we can see how good (bad) most
> > rigs are at spacings within roofing filter bandwidth! That was a
> > positive test.
> >
> > For steady repeating clicks a hundred-sweep peak storage with a
> > narrow spectrum analyzer or a good selective level meter with peak-
> > holding capability to measure actual bandwidth would work.
> >
> > A spectrum analyzer would miss things like the infamous IC-
> > 775DSP "thump", so they'd need a sample and hold selective level
> > meter or to use zero-sweep dispersion setting on an analyzer to
> > determine levels of "bumps" when VCO's switch.
> >
> > Let's hope we can get them to include REAL click tests.
> > 73, Tom W8JI
> > [email protected]
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> >
>
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