On 8/19/2012 11:59 AM, Jeff DePolo wrote:
>
> If the cable shields are properly bonded to the tower at the top and bottom
> of the vertical run as they should be, if for no other reason than lightning
> protection, then it doesn't matter whether they are inside or outside the
> tower.
IF and I emphasize the "IF" you ground the coax shield to the tower at
the top and bottom of the tower then it should really make no difference
that I can see even if shunt feeding the tower. However you would need
to make sure the grounds at top and bottom were very low ohm.
OTOH if the tower gets climbed much being inside would offer more
protection.
73
Roger (K8RI)
>
> --- Jeff WN3A
>
>> -----Original Message-----
>> From: towertalk-bounces@contesting.com
>> [mailto:towertalk-bounces@contesting.com] On Behalf Of Larry
>> Sent: Sunday, August 19, 2012 11:39 AM
>> To: towertalk@contesting.com
>> Subject: Re: [TowerTalk] Feedlines: inside or out on tower?
>>
>> I believe it is ON4UN's book where there was discussion of inside vs
>> outside. If you wanted to shunt feed the tower then inside
>> was preferable as
>> I recall. Apparently minimizes RF on the feedlines.
>>
>> 73, Larry W6NWS
>>
>> -----Original Message-----
>> From: Jim Hoge
>> Sent: Sunday, August 19, 2012 11:10 AM
>> To: towertalk
>> Subject: [TowerTalk] Feedlines: inside or out on tower?
>>
>> After reading John's (KK9A, P40A) post regarding tower
>> painting, I have a
>> question for the group. While I would be hard pressed to
>> recall a tower I
>> have worked on that has not had its feedlines and control
>> cables run on the
>> inside of leg, it is obvious from his post that not everyone
>> does so. What
>> is the thinking behind running the cables on the inside or
>> the outside? BTW,
>> I've even seen hardline run on the inside of 45 and 55, glad
>> it wasn't me
>> who had to install it.
>>
>> 73,
>> Jim W5QM
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