Towertalk
[Top] [All Lists]

Re: [TowerTalk] CM Choke

To: "reflector Towertalk" <towertalk@contesting.com>
Subject: Re: [TowerTalk] CM Choke
From: "Dave Hachadorian" <k6ll.dave@gmail.com>
Reply-to: Dave Hachadorian <k6ll.dave@gmail.com>
Date: Tue, 10 Oct 2017 07:59:19 -0700
List-post: <mailto:towertalk@contesting.com>
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@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@contesting.com> en nombre de Carol Richards <n2mm@comcast.net>
Enviado: lunes, 9 de octubre de 2017 21:11
Para: towertalk@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

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
TowerTalk Info Page - Contesting<http://lists.contesting.com/mailman/listinfo/towertalk>
lists.contesting.com
TowerTalk is for discussion of tower and HF antenna construction topics. TT members have lots of helpful information and are happy to share it.


_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

<Prev in Thread] Current Thread [Next in Thread>