[TowerTalk] Common Mode RF choke on a 50 MHz yagi

[dj7ww at t-online.de]

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 at contesting.com] On Behalf Of
Richard (Rick) Karlquist
Sent: Mittwoch, 1. Juli 2020 23:46
To: Jim Thomson; towertalk at 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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