[TowerTalk] CM Choke

[Dave Hachadorian]

Speaking of "tuning" a choke, couldn't you just run 50 watts into 
a dummy load, and tee off a choke and a 100 ohm resistor to 
ground, and calculate the impedance of the choke by measuring the 
RF voltage across the resistor and the RF voltage across the 
dummy load?

Dave Hachadorian, K6LL
Yuma, AZ


-----Original Message----- 
From: Máximo EA1DDO_HK1H
Sent: Tuesday, October 10, 2017 2:15 AM
To: Carol Richards ; TowerTalk at contesting.com
Subject: Re: [TowerTalk] CM Choke

Hi Carol,


43 mix works fine for CM chokes, but it depends the frequencies 
you need to cover.

Best procedure is to use a VNA and "tune" the choke for best 
choke impedance over the required frequencies.

Basically the number of turns, diameter, etc.


I've been testing some 43 mix cores some days ago, and depending 
on those variables, the choke will present the higher impedance 
over different frequencies.

You can hava a look at next link; 
http://foro.ea1ddo.es/smf/index.php?topic=3.0


I am sure more experienced colleagues will you explain further 
next.


73, Maximo


________________________________
De: TowerTalk <towertalk-bounces at contesting.com> en nombre de 
Carol Richards <n2mm at comcast.net>
Enviado: lunes, 9 de octubre de 2017 21:11
Para: towertalk at contesting.com
Asunto: [TowerTalk] CM Choke

Hello all...


Quick question... I know 31 mix is better, but I have 8 cores, 43 
mix. I
was thinking of 5 cores, 6 or 7 turns RG213 Or RG8X. Yes or no?


Carol

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