[TenTec] 1 kHz IMD with Preamp ON/OFF

[Carl Moreschi]

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 at adelphia.net>
To: <tentec at 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 at contesting.com
> [mailto:tentec-bounces at contesting.com]On Behalf Of Eric Scace K3NA
> Sent: Monday, December 22, 2003 7:13 AM
> To: tentec at 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 at contesting.com
> [mailto:tentec-bounces at contesting.com]On Behalf Of Bill Tippett
> Sent: 2003 December 22 06:45
> To: tentec at 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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