[TowerTalk] Feedlines: inside or out on tower?

[Chris]

The easiest way is probably just terminating the coax in a PL259 and using a bulkhead connector through a right angle bracket of some sort.  There are also gizmo's out there where you strip away the coax jack and clamp around the braid.  It must be sealed up real good though to keep moisture out if you do that....of course the same holds true with the PL259/bulkhead connector scheme.  If you happen to use a remote coax switch at the top of the tower then you're pretty much automatically grounded.

Chris
KF7P






On Aug 20, 2012, at 9:53 AM, iain macdonnell - N6ML wrote:

> On Mon, Aug 20, 2012 at 5:10 AM, K8RI <K8RI-on-TowerTalk at tm.net> wrote:
>> 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.
> 
> This is probably a really stupid question, but it's Monday morning, so
> I have an excuse...
> 
> How do you "ground" the coax shield at the top of the tower? What do
> you connect it to??
> 
> 73,
> 
>    ~iain / N6ML
> 
> 
> 
>> OTOH if the tower gets climbed much being inside would offer more
>> protection.
>> 
>> 73
>> 
>> Roger (K8RI)
>> 
>> 
>>> 
>>>                              --- Jeff WN3A
>>> 
>>>> -----Original Message-----
>>>> From: towertalk-bounces at contesting.com
>>>> [mailto:towertalk-bounces at contesting.com] On Behalf Of Larry
>>>> Sent: Sunday, August 19, 2012 11:39 AM
>>>> To: towertalk at 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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Apparently I am supposed to be more concerned about the way Mitt Romney spends his money than how Obama spends mine.