Jim,
Do you have a planned date for your pending publication? I would like to be
able to read what you have to say.
Regards,
Jim N9PXO
Life is Good☺
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Jim Brown
Sent: Wednesday, October 31, 2018 6:45 PM
To: rfi@contesting.com
Subject: Re: [RFI] tips on building common mode chokes
Hi Bill,
I strongly suggest that you hold off on this, pending publication of
major work that I've been doing on these chokes over the past year.
73, Jim K9YC
On 10/31/2018 11:56 AM, bill K7WXW wrote:
> I am building a set of feed line common mode chokes to test in my
> shack, using K9YC's published test data and charts (mahalo, Jim!).
> Since the chokes will be inserted into existing feed lines, each
> choke, wound on a type 43 or 31 2.4 inch toroid, will be terminated
> with SO239 and PL259 connectors. I run 200W maximum though my normal
> operating power is less than twenty.
>
> The bifilar chokes use #14 or #12 THHN wire. I can install a PL259
> solder connector designed for LM400 pretty easily on either but the
> SO239 side of things is giving me fits. I just can't figure out how to
> nake a solid solder connection with wire this size and the standard
> SO239, whether in bulkhead or panel mount form. Is there some version
> of the connector I just haven't managed to locate? Some trick to
> getting big wire in a small hole? I've been staring at photos of other
> people's chokes for a couple of days and haven't figured it out.
>
> I will also be making coax versions with both toroids and the clamp on
> ferrites though I am inclined to the bifilar versions based on Jim's
> data. The idea is to compare them all side by side in operation and
> see which work the best in my situation. I'd also test them on a
> vector analyzer if I had one, but alas I don't.
>
> Thanks in advance! 73 de bill K7WXW
>
> ______________
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