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Re: [TowerTalk] Coax ground braid

To: "Bob Ad5vj" <ad5vj@ad5vj.com>, <jim@audiosystemsgroup.com>, <towertalk@contesting.com>
Subject: Re: [TowerTalk] Coax ground braid
From: "Jim W7RY" <jimw7ry@gmail.com>
Reply-to: Jim W7RY <jimw7ry@gmail.com>
Date: Mon, 16 Apr 2012 19:12:20 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Or the jacket has contaminated the braid by out-gassing. The coax was 
probably MUCH older that anyone though it was.

73
Jim W7RY


--------------------------------------------------
From: "Bob Ad5vj" <ad5vj@ad5vj.com>
Sent: Monday, April 16, 2012 3:54 PM
To: <jim@audiosystemsgroup.com>; <towertalk@contesting.com>
Subject: Re: [TowerTalk] Coax ground braid

> So it is water damage.
>
> When I make up my coaxes, I always solder all the holes at the pl-259 and 
> seal it with coax selfsealing tape and adhesive lined doublewalled 
> heatshrink. So no water got in at the connectors I dont think.
>
> This coax was given to me on a roll 500' long to make 2 80 meter bazookas. 
> He said the roll was found some years before and kept in a shed and I 
> could keep the rest. So the water damage must have been there all along.
>
> Free is not always free.
>
> I will remake the station grounds, even though I spent all afternoon 
> taking the station apart and cutting out the braids to make sure it was 
> right.
>
> I was always told to use flat braid for station grounds in years past for 
> RF purposes and if you didnt have any, make it from coax braid.
>
> Guess W3LPL has found out different.
>
>
> tnx Bob AD5VJ
>
>
> Sent from my Samsung Epic™ 4G
>
> Jim Brown <jim@audiosystemsgroup.com> wrote:
>
> On 4/16/2012 11:08 AM, Bob Ad5vj wrote:
>> In doing so, after removing the outer jacket I see places where the 
>> copper is black in some areas. Some places as much as a foot long.
>>
>> 1. Will this hurt the conductivity as a ground braid assuning I clean it 
>> up where I make contact from the equipment?
>
> YES -- that's corrosion, and it can greatly reduce the conductivity of
> the braid.
>
>>
>> 2. Has anyone seen this before?
>
> Sure. it means your coax has gotten wet.
>
>>
>> 3. Does this mean I need to changeout all my 3yr old coax outside which 
>> came off the same roll at the same time?
>
> If it all looks like that, YES.  I'd do some more inspection first.
> Water gets into coax either at connectors, or at tiny breaks in the
> outer jacket, look for damage and for poor waterproofing.
>
> And I would be a lot more careful with what  I bought to replace it, and
> I'd also be VERY careful about proper installation of connectors, and of
> waterproofing all the connections.
> 73, Jim K9YC
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