K3 5-pole plots

[Gary Hvizdak]

On Thu Nov 29 2007 at 21:36:03 EST Paul (N4LCD) wrote ...

Does anyone know the URL of plots of the K3's two 5-pole roofing filters?

--

Paul,

   The last time I checked there were no 5-pole filter plots on Elecraft's
website.  Further, if you know where to look the identical 8-pole plots can
also be found on the new INRAD site at http://www.inrad.net/  (Using the
INRAD site's built-in advanced search, look for filters with a center
frequency of "8215" and then ignore the results that are "8215.9".)

   Given Elecraft's current focus on shipping K3, my *guess* is that 5-pole
plots won't be available anytime soon, unless an independent lab, (like the
ARRL or Sherwood Engineering) makes them available.

73,
Gary  KI4GGX

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[Paul-285]

>
>
>Does anyone know the URL of plots of the K3's two 5-pole roofing filters?
>
>
>
>    The last time I checked there were no 5-pole filter plots on Elecraft's
>website.  Further, if you know where to look the identical 8-pole plots can
>also be found on the new INRAD site at http://www.inrad.net/  (Using the
>INRAD site's built-in advanced search, look for filters with a center
>frequency of "8215" and then ignore the results that are "8215.9".)

I went to Inrad's site and searched on "8215" and got 13 8-pole
filters, but no 5-poles.

Then I searched on just "5-pole" with no results.






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[Gary Hvizdak]

Paul N4LCD wrote ...

I went to Inrad's site and searched on "8215" and got 13 8-pole
filters, but no 5-poles.  Then I searched on just "5-pole" with no results.

--

Paul,

    I got the impression that the other filters were made by Elecraft.  If you look at Craig Rairdin's, (NZ0R) K3 assembly pictures you'll see the difference between the INRAD's filters and Elecraft's filters.

73,
Gary  KI4GGX

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[Matt Kastigar]

Elecraft is in Aptos, Ca;  
Inrad is in Aptos, CA.... Any connection, or just '*the* place to be'?!

thx, -Matt W0XEU


>>> <[hidden email]> 11/30/2007 11:32 AM >>>
Paul N4LCD wrote ...

I went to Inrad's site and searched on "8215" and got 13 8-pole
filters, but no 5-poles.  Then I searched on just "5-pole" with no results.

--

Paul,

    I got the impression that the other filters were made by Elecraft.  If you look at Craig Rairdin's, (NZ0R) K3 assembly pictures you'll see the difference between the INRAD's filters and Elecraft's filters.

73,
Gary  KI4GGX



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[AJSOENKE]

I believe the 5 pole filters are made in house at Elecraft and the 8pole
filters are sourced to Inrad.

Here's a question -

I have a perfectly good  Yaesu FT990 and have always wanted a narrow CW
filter for its 2nd IF ( The first IF has a "roofing filter" of sorts). Anything
between 100Hz  and 4/500Hz would be acceptable. The original filter options
appear to have been Inrad products, and many web references come back to Inrad. But
the well is dry when looking for one. (Anyone out therhave one to sell?)

I haven't had a chance to check the 990 manual for IF freq, but am wondering
if it is 8215, how difficult could it be to adapt a K3 designed filter to the
990? The 990 filter board has large enough space to do a 2 step with
intermediate adapter board. That's something I can handle.

Al WA6VNN



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