[TowerTalk] 160m vertical

Tom Frenaye frenaye at pcnet.com
Sun Feb 4 18:31:35 EST 2018


At 03:07 PM 2/4/2018, Donald Chester wrote:
>>  Isn't there some restrictions on structures that can effect the field-strength
>> when the structure is near a BC station? I want to remember that if your
>> tower affect the field-strength distribution of a BC station you have to take
>> measure not to disturb it.
>> 
>> I am sure, if you have any sizable voltage/current induced by a nearby BC
>> station you certainly change the radiation pattern from that station.
>> 
>> Just something to be aware of.
>> 
>> Hans - N2JFS
>
>I recall a rule that commercially licensed stations must take the effects of their tower on nearby BC stations into consideration, but I have never seen anything in Part 97 requiring  hams to take a similar precaution, nor have I ever heard of a ham receiving a notification that his antenna was causing a problem.  As I recall, even a 50 ft tower as far as a mile away may affect the directional pattern of some AM BC arrays.
>
>Don k4kyv

Don -

Commercial tower owners need to detune their towers to insure they don't mess up an AM broadcast antenna pattern.

In searching for how to detune my tower with a 160 4-square around it, I ran into a lot of commercial options available for commercial towers.

Just Google "tower detuning". 

     -- Tom


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