[1000mp] 1000MP-MV Filter choice

Thu, 28 Mar 2002 07:35:51 -0600

.> Be aware that, in the MP, two 2nd IF filters--500 and 2400 Hz--are wired
in,
> and must be desoldered to be replaced. I am not sure if the Mk V is the
> same. Desoldering requires detachment of many connectors, and removal of
the
> circuit board, and is not a quick, easy operation. If you are not
> technically adept at such work, either have it done for you, or leave the
> filters be and add only the snap-in filters.
>
> You can move the 500 Hz Collins mechanical filter from the main 3rd IF to
> the sub-receiver 2nd IF and install a 400 Hz INRAD in its place. The
> combination of the wired-in 500 Hz in the 2nd IF and the sharp INRAD in
the
> 3rd IF should suffice--the 400 Hz filter then essentially defines the
> passband, while both define the stopband. If you need to spend more money,
> add a 250 Hz CW INRAD filter to the 3rd IF band, and/or a pair of 2.0 kHz
or
> 1.8 kHz INRADs for SSB.
>
> In my case, I added a pair of 2.0 kHz INRAD filters for SSB, moved the
> mechanical filter to the sub-RX, and added 400 and 250 Hz 3rd IF filters
for
> CW and RTTY.
>
>
> Garry, NI6T

I have done exactly what Gary has done, except I added INRAD 1.8's instead
of 2.0's to my MK V. The factory wired in 500 in combo with the INRAD 400
works very well and I just use the INRAD 250 when the going gets really
rough. The INRAD 1.8's are super. The first few minutes of using them takes
some getting used to but once you adjust to the sound they are great. I use
them 100% of the time in contests but just use the stock filters when
ragchewing on a quiet band.

Jim  N0AV

> > -----Original Message-----
> > From: [email protected]
> > [mailto:[email protected]]On Behalf Of Thomas Rudolph
> > Sent: Wednesday, March 27, 2002 12:46
> > To: [email protected]
> > Subject: Re: [1000mp] 1000MP-MV Filter choice
> >
> >
> > Hello again,
> >
> > please let me answer my question myself ;-)
> >
> > I digged a little bit more in the list archives and the web, and IMHO
the
> > best way is to use complete
> > INRAD filter pairs. So I think I'll use 1.8k and 400Hz pairs +
> > 70MHz IF mod
> > , and that's it.
> >
> > Of course I'm still interested in further experiences and hints.
> >
> > 73 de DK3DUA
> > Thomas
> >
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