[1000mp] inrad 1.8 filter experience

[Mike Schatzberg]

Hello John:

My comments refer to the Mark V.

Regards,

Mike
WB2AJI
----- Original Message ----- 
From: "n3drk" <n3drk at triad.rr.com>
To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
Sent: Saturday, May 28, 2005 4:15 PM
Subject: Re: [1000mp] inrad 1.8 filter experience


> Mike, are you referring to the mark V or mp?
> john
>
> ----- Original Message -----
> From: "Mike Schatzberg" <cherokeehillfarm at earthlink.net>
> To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
> Sent: Friday, May 27, 2005 8:39 AM
> Subject: Re: [1000mp] inrad 1.8 filter experience
>
>
> > Hello Yaesu Fans:
> >
> > I removed the 1.8 khz third IF filter, after about 2 years, after
> > experimenting with various Inrad combinations.  The 1.8 khz pair,
provides
> > the best QRM reduction, but the fatigue of listening was too high for
> > everyday DXing.  I achieved the more comfortable sound of the 2.4 khz
> pair,
> > by using the 8 pole Collins 2.0 khz filter in the third IF.  If you use
a
> > slight counterclockwise rotation of the shift control with this
> combination,
> > you may not even realize that you have the narrow pair engaged, as the
> > quality is that good.  I think your ear must get trained to listening to
> the
> > mechanical filter sound, as your 2.4 third IF is also a ten pole Collins
> in
> > the Mark V.
> >
> > The use of the DSP filters in the second IF, adds quite sharp skirts to
> the
> > analog filters, and can be superimposed over the various filter
> > combinations.  When the band is quiet, and the QRM low, I especially
like
> > the use of no filter in the second IF, and the 6 khz ceramic filter in
the
> > third.  For additional selectivity, you then engaged the DSP into the
> second
> > IF.  These combinations give the lowest noise floor possible.
> >
> > All the above I use with the Inrad roofing filter.  You will generally
> find
> > that reducing the IF gain in menu 9-1 by two numbers from the factory
> > setting, will give excellent results, and further reduce the noise floor
> and
> > improve the MDS level.  Please don't forget to use the RF gain control
at
> > all times, reducing the average setting to about 2 o'clock, for the
lowest
> > noise floor, and highest audio quality.
> >
> > I have found the above set up to work extremely well, and to provide the
> > best QRM reduction when necessary, without fatigue.  Even working
pileups
> > for hours is not as tiring as it once was.
> >
> > Regards,
> >
> > Mike
> > WB2AJI
> > ----- Original Message -----
> > From: "k8rs" <k8rs at arrl.net>
> > To: <rick.moskovits at ns.sympatico.ca>; "All about Yaesu 1000mp"
> > <1000mp at mailman.qth.net>
> > Sent: Friday, May 27, 2005 7:55 AM
> > Subject: Re: [1000mp] inrad 1.8 filter experience
> >
> >
> > > Rick,
> > >          The Inrad roofing filter I just installed in my 1000MP has
made
> > the
> > > audio harsh and distorted on strong signals.  Look as if there is too
> much
> > > gain there and has to be reset.
> > >          I am quite satisfied with the two SSB filters I have had for
5+
> > > years.
> > >                            K8RS
> > >
> > >
> > > ______________________________________________________________
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> >
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>
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