[Yaesu] FT900 filter help

[Jim Miller]

Just a suggestion but you can see this visually on the screen of a computer
if you use one of the PSK31 programs that displays the "waterfall" of
received signals.  Without the filter engaged, you sill see the signals in
the bandpass and then with it on you should see the narrowed bandpass quite
obviously cutting off the signals outside the filter range.  I use an
original Icom 746 (sorry) but it is very visible when I turn on the optional
filter.

73, de Jim KG0KP

----- Original Message ----- 
From: "Kelly Jones" <kjones at sullivan1.com>
To: <Yaesu at mailman.qth.net>
Sent: Wednesday, August 24, 2005 10:10 PM
Subject: [Yaesu] FT900 filter help


> Hi Guys (and gals),
>
> I recently put an InRad 703 400hz filter in my FT-900 and so far I'm very
> disappointed with the way it performs.  With the CW Narrow engaged, I now
> get all kinds of "images" when tuning the band.  If I punch the CW button
> to take it out of "narrow" most of the images go away, however, there are
> still a few that seem to occur with very strong signals.
>
> As for actually tightening up the receive, I can't say it did anything at
> all.  I can still hear signals well outside of the 500hz range.  In fact,
I
> can still hear signals nearly 2khz away in "narrow".  Is this normal for
> this radio/filter combination?
>
> While I shouldn't compare the performance to my Mark V, I would certainly
> expect more than what I'm seeing.  Something doesn't appear to be right,
> but I can't tell what it is.  As a side note, the 703 used to be a 703C.
I
> removed the circuit board in order to mount the filter in the FT-900.
From
> what I have been told (including InRad), the only difference is that the C
> model has the circuit board attached for the MP line.
>
> Any suggestions or ideas would be appreciated.  I'm getting ready for a
> couple of contest expeditions and was hoping this radio would play.
>
> 73
> Kelly - N0VD
>
>
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