[1000mp] inrad 1.8 filter experience

[Mike Schatzberg]

Hello John:

To set up the option, to use the wider 2nd and 3rd IF filtering, go to menu
5-0, SSB normal, and select 8.2-455 over the main tuning dial.

If you have previously installed narrow SSB filters, and they were appearing
in bandwidth position NAR 1, you will find a change.

Now, NOR will select thru in the 2nd IF and 6.0 khz in the 3rd IF.  NAR 1
will be cascaded 2.4 filters in the 2nd and 3rd, and NAR 2 will be your
optional narrow pair, if they are installed, both cascaded.

When you select the IDBT button, you take control of both the 2nd and 3rd IF
filters while adjusting both the SHIFT and WIDTH controls.  So while you are
using the EDSP filters, after the 4th mixer, the CPU sets the DSP filter to
match the analog selections in the 2nd and 3rd IF, and tracks all
adjustments together.

So, once you then engage the IDBT, you are controlling both the analog
filters as well as the digital filters following the 4th mixer and before
the AF amplifier.

Try the change in menu 5-0, and see how you like the reception of both large
and small signals.  Notice that you will have maximum fidelity with this
option, which is particularly noticeable with strong wide signals.  For more
selectivity, and less fidelity, but still with low noise, add the IDBT
function.

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 8:04 PM
Subject: Fw: [1000mp] inrad 1.8 filter experience


>
> ----- Original Message -----
> From: "n3drk" <n3drk at triad.rr.com>
> To: <cherokeehillfarm at earthlink.net>
> Sent: Saturday, May 28, 2005 8:01 PM
> Subject: Fw: [1000mp] inrad 1.8 filter experience
>
>
> > > 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.
> >
> > Mike, thanks for the reply. I still do not understand something. The DSP
> > filters are in the 4th IF are they not? What do you mean by using them
in
> > the second IF? Also what do you mean by not using a filter in the second
> IF?
> > Do you physically go into the rig and take the filter out? If not what
do
> > you do in the menu to create this effect?
> >
> > Thanks
> > john
> >
>
> ______________________________________________________________
> 1000mp mailing list
> Home: http://mailman.qth.net/mailman/listinfo/1000mp
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:1000mp at mailman.qth.net