[Boatanchors] Boatanchors Digest, Vol 102, Issue 19

[James Liles]

Hi Mac:

It will probably work ok --- choke just keeps the energy at the shield side 
of the antenna rather than some of it following the shield down.  I used to 
connect the coax directly to the antenna and had good results but 
experienced some anomalies not related to performance.

When I operated 40 meters the electronic switches on my sumps would turn on 
and never turn off.  After replacing three pumps, I decided to monitor 
coincidence and voila it was me and 40 meters.  Snapped the 6 chokes around 
the coax at the antenna end of the coax and problem solved.  Also took care 
of some RF bites my better half received from some lamp switches.  Have no 
idea why it was 40 meter specific and don't much care.  Thanks for the 
suggestion.

A good day to you --- Kindest regards Jim K9AXN



Message: 2
Date: Sat, 14 Jul 2012 21:21:43 -0700
From: mac <w7qho at aol.com>
Subject: Re: [Boatanchors] Ferrite Choke
To: "James Liles" <james.liles at comcast.net>
Cc: boatanchors at mailman.qth.net
Message-ID: <4B8F9CD1-7282-480F-99F2-59F9749F4EF9 at aol.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes

Might be interesting to put the antenna up without any choke or
ferrite and see how it works out......

Dennis D.  W7QHO
Glendale, CA

******************
On Jul 14, 2012, at 12:42 PM, James Liles wrote:

>
>
> Hi Keith:
>
> Simplest way is to determine how many turns of coax that are
> recommended for
> the antenna/band.  Then wrap it and measure the inductance.  Then
> slip a
> snap on choke onto a piece of coax and measure the inductance with and
> without the choke.  Now you know how many to install.
>
> I use a series of 6 TDK ZCAT3035-1330 snapped around RG8 to simulate
> 12
> turns of coax.  They add about 3uh per core.
>
> Good luck and a great day to you Keith.
>
> Kindest regards Jim K9AXN
>
> ----------------------- ORIGINAL MESSAGE
> -----------------------------------
> Message: 1
> Date: Fri, 13 Jul 2012 13:13:20 -0400
> From: "Keith Densmore" <kmd at xplornet.ca>
> Subject: [Boatanchors] Ferrite Choke
> To: <boatanchors at mailman.qth.net>
> Message-ID: <380FD25D51E9464DA026C471D633FE78 at keith3dc125020>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Greetings Listmates,
> Just finished installing a off center fed dipole here and I thought
> I had
> enuff coax to wind a choke but alas, no exta coax.
> Does anyone know where I can find the snap on ferrite chokes that
> would fit
> RG 213 ??
>
> Thanks, 73,
>
> Keith ve3ts
>
>
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End of Boatanchors Digest, Vol 102, Issue 19
********************************************