95% velocity factor will probably be allright, a thin wire is typically 3%
shorter for quarter wave resonance then free space calculates.
73
Peter
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
Richard (Rick) Karlquist
Sent: Mittwoch, 1. Juli 2020 23:46
To: Jim Thomson; towertalk@contesting.com
Subject: Re: [TowerTalk] Common Mode RF choke on a 50 MHz yagi
On 7/1/2020 10:27 AM, Jim Thomson wrote:
> Date: Sun, 28 Jun 2020 15:10:18 -0700
>
> shorter. Using Ricks 56 inches, thats a 5% shortening. No loop
required,
> except for normal rotor loop.
>
> Jim VE7RF
>
I meant 59 inches for 50.000 MHz. Quarter wave free space.
Looks like I miscalculated or something and ended up typing
56 inches. I wasn't trying for 5% short. My bad.
Anyway, I think your method makes even more sense.
As a former network analyzer designer, I am impressed
that you were able to think outside the box and use
a current probe as a superior modality. That emulates
the architecture of the HP 4815 vector impedance
meter, which is nothing like a VNA. Good job!
73
Rick N6RK
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