[Boatanchors] Ferrite Chokes

[Geoff]

It doesnt matter which way the coax is run, the first line of defense is at 
the antenna unless you like the feedline to continue radiating.

Wrapping the coax around 2 of Fair-Rite part 2631803802 at $6.94 each from 
Mouser will be more effective than twice the cost of snap ons.


----- Original Message ----- 
From: "James Liles" <james.liles at comcast.net>
To: <boatanchors at mailman.qth.net>
Sent: Monday, July 16, 2012 1:09 PM
Subject: [Boatanchors] Ferrite Chokes


> Hi again Keith:
>
> Don't know how difficult it is to get to the antenna feed point but here 
> is
> a thought that you might entertain if you are really fussy about your
> antenna.  Simply add a mast mounted or hanging  balun.  That way both 
> halves
> of the antenna wire will participate.  Couple of advantages.  The antenna
> will be a bit less susceptible to noise and there will be a very slight 
> bit
> of gain from driving both wires.  Also would significantly reduce RF on 
> the
> shield --- wouldn't have to use the cores at the antenna.  If the coax is
> not 90 degrees from the antenna, I would still use the snap on cores but 
> at
> the entry to the shack.
>
> Just a thought --- the cores will be just fine though.
>
> Good luck Keith and let us know how all works out.
>
> Kindest regards Jim K9AXN
>
> --------------------------  Original
> message ----------------------------------------
>
> Message: 1
> Date: Mon, 16 Jul 2012 11:25:36 -0400
> From: "Keith Densmore" <kmd at xplornet.ca>
> Subject: Re: [Boatanchors] Ferrite Chokes
> To: <boatanchors at mailman.qth.net>
> Message-ID: <FC2A0A80A16645AABA4B7B15F935A631 at keith3dc125020>
> Content-Type: text/plain; charset="iso-8859-1"
>
>>>> Might be interesting to put the antenna up without any choke or
>>>> ferrite and see how it works out......
>
>
> Thanks to a kind suggestion from one of the list members, I have ordered a
> set of beads from Palomar. The advantage of these is I do not have to
> disassemble the coax connectors to install.
>
> I used to use a multi wire dipole without balun, located not too far from
> the house without any RF feedback issues. Not so with the Off center fed
> dipole which is totally unbalanced, and without a choke causes lots of RF
> back into the shack. I guess there is no such thing as 'free lunch'.
>
> 73
>
> Keith ve3ts
>
>
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