That sounds like 4 poles to me.
Carl Moreschi N4PY
Franklinton, NC
----- Original Message -----
From: "John L Merrill" <jmerrill1@adelphia.net>
To: <tentec@contesting.com>
Sent: Tuesday, December 23, 2003 3:58 AM
Subject: RE: [TenTec] 1 kHz IMD with Preamp ON/OFF
> Looking at the filter there are only 4 crystals.
>
> -----Original Message-----
> From: tentec-bounces@contesting.com
> [mailto:tentec-bounces@contesting.com]On Behalf Of Carl Moreschi
> Sent: Monday, December 22, 2003 10:52 PM
> To: tentec@contesting.com
> Subject: Re: [TenTec] 1 kHz IMD with Preamp ON/OFF
>
>
> I've been misquoted on the 1000 hertz filter. I said it had a shape
factor
> of 3 to 1 but I have not removed it and looked at to see how many poles it
> had. I believe Bill said it was a 4 pole. I do not know. I also believe
> the 3 to 1 shape factor is fine for a roofing filter.
>
> 73,
>
> Carl Moreschi N4PY
> Franklinton, NC
> ----- Original Message -----
> From: "John L Merrill" <jmerrill1@adelphia.net>
> To: <tentec@contesting.com>
> Sent: Tuesday, December 23, 2003 3:46 AM
> Subject: RE: [TenTec] 1 kHz IMD with Preamp ON/OFF
>
>
> > only 4
> >
> > -----Original Message-----
> > From: tentec-bounces@contesting.com
> > [mailto:tentec-bounces@contesting.com]On Behalf Of Eric Scace K3NA
> > Sent: Monday, December 22, 2003 7:13 AM
> > To: tentec@contesting.com; Bill Tippett W4ZV
> > Subject: RE: [TenTec] 1 kHz IMD with Preamp ON/OFF
> >
> >
> > Bill --
> >
> > I would be surprised if the built-in 1000 Hz filter has only 4 poles.
> I
> > would have expected it to have 8 poles, like the 2.4 kHz
> > filter. This would be interesting to clarify.
> >
> > -- Eric K3NA
> >
> > -----Original Message-----
> > From: tentec-bounces@contesting.com
> > [mailto:tentec-bounces@contesting.com]On Behalf Of Bill Tippett
> > Sent: 2003 December 22 06:45
> > To: tentec@contesting.com
> > Subject: [TenTec] 1 kHz IMD with Preamp ON/OFF
> >
> >
> > G3ZEM/5B4AGN wrote:
> > >I wonder about the answer to your first question too and like you I
> > suspect accidental transposition of data as the cause.
> >
> > That's my guess also but QST's summary is consistent with the
ETR
> > graph, so it is not an obvious transposition as the IP2 results were.
> > Will be interesting to see if Michael can help clarify this point.
> >
> > >So far as close
> > in degradation on the K2 is concerned; I strongly suspect this to be due
> > to the rather gentle skirt slope of the K2 xtal ladder filter.
> >
> > Could be, but Orion's 1000 Hz roofing filter used in this test
> does
> > not have a great shape factor either. According to N4PY it is a 4-pole
> > and about a 3:1 shape factor. The biggest difference may be the fact
> > that the older K2 did not have DSP (which it now does) and of course
> > Orion used a 500 Hz DSP filter following the 1000 Hz roofing filter.
> > When ARRL's new test of the K2/100 is published, I suspect the K2's
> > results should be much better.
> >
> > 73 & Merry Christmas!
> >
> > Bill W4ZV
> >
> >
> >
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> >
> >
> >
> >
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