[amsat-bb] Re: Cross Boom

[Joe]

Because you now have a metal object  (the coax) running along the 
fiberglass boom,  and this WILL effect the radiation pattern of the 
antenna. and possible the match also.

Jeff Yanko wrote:

> Hi all,
> I found this line confusing....
>
> "But then  if you go insulated  then do not run the feedline along it 
> either or you just defeated the purpose of the insulated boom."
>
> My question is if you run the coax along an insulated crossboom, ie. 
> fiberglass, how could that affect the coupling of the transmission 
> line when the object it is being attached to is "insulated"?
>
>
> 73,
>
> Jeff  WB3JFS
>
>
>
>
>
> ----- Original Message ----- From: "Joe" <nss at mwt.net>
> To: "Billy Simpkins" <bsimpkins31 at dishmail.net>
> Cc: <amsat-bb at amsat.org>
> Sent: Wednesday, April 22, 2009 7:06 AM
> Subject: [amsat-bb] Re: Cross Boom
>
>
>> It all depends on how the elements are mounted.
>>
>> If at 45 to 90 degrees from the crossarm,  no propblem and use anything,
>>
>> But if in the same plane  then need insulated  crossboom,
>>
>> But then  if you go insulated  then do not run the feedline along it
>> either or you just defeated the purpose of the insulated boom.
>>
>> Billy Simpkins wrote:
>>
>>> Is a fiber glass or some other non-conductive material necessary for 
>>> a cross boom?  What or the advantages and disadvantages versus a 
>>> metal one?
>>>
>>> Thanks,
>>> Billy KF0CK
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>
>
>