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
>
>
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
>
>
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
> ---
> Incoming mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.554 / Virus Database: 346 - Release Date: 12/20/2003
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
---
Incoming mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.554 / Virus Database: 346 - Release Date: 12/20/2003
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|