[TowerTalk] 4 square for 80

[Joe Subich, W4TV]

Jim,

The problem is that, in that application, the cables must be 1/4 wave
long electrically.  That already makes them shorter than desired and
"wound" chokes on each end would shorten them by another 5-7 feet
making the spacing of the 4 square much too small.

73,

    ... Joe, W4TV

On 9/25/2016 4:38 AM, Jim Brown wrote:
> 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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>
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