[TowerTalk] 4 square for 80

[Jim Brown]

Tim,

I agree that they must be choked, but NOT with inductance, because those 
short lines, by virtue of their length, are capacitive (in the common 
mode circuit). So the choke MUST be resistive, which means turns wound 
to make it parallel resonant at the operating frequency. Study my 
RFI-Ham tutorial.

73, Jim

On Sat,9/24/2016 6:42 PM, Tim Duffy wrote:
> Hello Jim,
>
> We are talking about feedlines that are 20 feet (feedlines) above the
> ground. They have to be choked (both ends). The raised radial application
> (which is not as good as the ground mounted solution with 64 plus radials).
> The feedlines must not be radials - that is why they must be choked.
>
> 73,
> Tim K3LR
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Jim
> Brown
> Sent: Saturday, September 24, 2016 3:36 PM
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] 4 square for 80
>
> On Sat,9/24/2016 10:07 AM, David Robbins wrote:
>> I fail to
>> see why the shield of the feedlines is different from the radials it is
> connect to at the base of the vertical.
>
> The radials are not connected to anything at the far end. The feedline is.
>
> I've seen several recommendations from people I view as "authorities"
> say that the feedlines of vertical antennas should be choked. Sorry, I
> don't recall who.
>
> 73, Jim K9YC
>
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