I have fabricated many chokes using the data in K9YC's cookbook and
performance has been as specified. A NEMA box, some THHN #12 and some #31
ferrite and it works every time.
Ron N9AU
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Steve Maki
Sent: Tuesday, July 21, 2020 5:38 PM
To: towertalk <towertalk@contesting.com>
Subject: Re: [TowerTalk] Balun for Force 12 6 Element 20 Meter Monobander
On 07/21/20 11:42 AM, Robert Harmon wrote:
> I just looked at the 5KW choke balun on the MyAntennas site. I like the
fact that they show the choking impedance. Not so with most of the other
providers. I looked for the choking impedance data on the DXE baluns and
could not find it. I guess I could call them and find out.
>
> The last two choke baluns I installed, I made myself from Jim's cookbook.
I know what the choing impedance is and it cost much less than buying
one.............
From what I've heard, the properties of ferrites can vary wildly,
especially from run to run, so unless you measure the one you make, you
don't know.
OTOH, I'm not sure that it's possible to make a choke using recommended (by
K9YC) method & parts and end up with a *useless* choke. It may not have the
theoretical best impedance, but still......
-Steve K8LX
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