[TowerTalk] Fwd: Fwd: Terminate braid at top of tower...or not?

[Hans Hammarquist via TowerTalk]

Sorry Jim,


You are right about the generated heat. I was more thinking about it from an electrical point-of-view.


Connecting the shields on each side of the choke with each other will defeat the purpose of the choke. That's what I was pointing out.


Putting the choke inside a metal box would be OK provided the box is large enough (to be able to conduct generated heat to the outside) or ventilated (although not to allow rain, snow and insects to get inside.


Hans - N2JFS



-----Original Message-----
From: Jim Brown <jim at audiosystemsgroup.com>
To: towertalk <towertalk at contesting.com>
Sent: Sun, Nov 2, 2014 1:04 am
Subject: Re: [TowerTalk] Fwd:  Terminate braid at top of tower...or not?


On 11/1/2014 6:01 AM, Hans Hammarquist via TowerTalk wrote:
> Using a metal box to contain your current choke is OK

I disagree, because the box contains any heat produced in the choke, 
reducing the dissipation of that heat to the outside air, thus reducing 
the power handling of the choke.

The reason for bonding coax at top and bottom of a conventional tower 
has nothing to do with the shack, but rather is to keep the shield of 
the coax at the same potential as the tower, with the intent of reducing 
the likelihood of arcing between the coax shield and the tower in the 
event of lightning. In other words, it is to protect the coax.

73, Jim K9YC
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk