[TowerTalk] Fwd: Insulated elements, Yes - No?

[Joe Subich, W4TV]

 > BUT -- if you happen to be loading your tower on 80 or 160, you may
 > appreciate the additional top loading of elements bonded to the boom.

However, if that is the case, a short wire connected from the center of
the last director and reflector to the boom will provide the desired
connection for top loading on 80/160 without upsetting the element
lengths by introducing odd size sections (mounting plate and boom) in
the element on the beam's operating frequencies.

73,

    ... Joe, W4TV


On 2014-08-05 2:55 PM, Jim Brown wrote:
> On 8/5/2014 11:42 AM, Stan Stockton wrote:
>> Dan/Hans,
>>
>> I cannot imagine building another antenna with parasitic elements
>> mounted to an aluminum plate with the elements electrically connected
>> to the boom and haven't made one that was connected in over a decade.
>> FWIW,  I don't think you will find an element on any antenna at W3LPL
>> or K3LR grounded to the boom.
>
> The boom is NOT at ground potential, except at DC.  A better way of
> describing a connection to the boom is "bonded." Bonding to the boom is
> also beneficial for lightning protection.
>
>>   It is certainly easier to model the antennas if they are floating.
>
> The difficulty in modeling is estimating the effective diameter of the
> boom and the mounting plate.
>
> BUT -- if you happen to be loading your tower on 80 or 160, you may
> appreciate the additional top loading of elements bonded to the boom. :)
>
> I'm confident that you know all this stuff, but others may not. :)
>
> 73, Jim K9YC
>
>
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