[TowerTalk] FIRST TOWER & 2ND FLOOR SHACK --HELP

Wed Aug 7 12:59:51 EDT 2013

It shouldn't matter where the line of demarcation is between open coax and the coax running through the conduit.  Whether you run the conduit to the top of the tower and put your polyphasers at that point OR run the conduit to the base of the tower and place the polyphasers at that point OR run conduit through the house and place the polyphasers at the entrance point its all about providing that alternate path for lightning that doesn't pass through your hamshack.  At that boundary point between coax and coax in conduit nothing should pass that isn't decoupled to provide that alternate path for the lightning.  Don't carefully ground and polyphaser all the coax cables at this point and then just loop the rotor cable around it which would provide an unfiltered path for lightning straight into your shack.

Not sure how large the inductively coupled component of a strike would be but I would assume that it would be smaller on your short run of coax as compared to the coupling to very long power lines that are probably coming into your home without any filtering.

Earl
N8SS

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Message: 8
Date: Wed, 7 Aug 2013 11:34:54 -0400
From: john at kk9a.com
To: towertalk at contesting.com
Cc: wewill747 at gmail.com
Subject: Re: [TowerTalk] FIRST TOWER & 2ND FLOOR SHACK --HELP
Message-ID: <0da7d0eb6d0651e4d80317b298f23a76.squirrel at www11.qth.com>
Content-Type: text/plain;charset=iso-8859-1

I also have a 2nd floor station, I have no RF ground. W8JI has information
in his site regarding second floor grounding
http://www.w8ji.com/second_floor_grounding.htm

John KK9A

To:	towertalk at contesting.com
Subject: [TowerTalk] FIRST TOWER & 2ND FLOOR SHACK --HELP
From:	 Wayne Willenberg
Date:	 Wed, 7 Aug 2013 09:22:03 -0400

My *first tower* (a 100? crank-up including the mast) is scheduled to
arrive in mid-October.  It will be located 150? from the base of my house.

The problem is, *my shack is located on the second floor of my house*.  So,
all cables that will go to and from the tower first go through the second
floor wall, down the exterior wall (a distance of about 20?) to a central
grounding point.

I just finished reading a technical note from PolyPhaser called ?Ham Radio
Station Protection.?  It suggested for my situation (i.e., shacks that are
above the basement) that coax, ground strap and rotor cables that run
vertically up my outside wall Might inductively couple some energy from the
tower, if it was struck by lightning, to the shack.

The article suggested having all of the cables go through surge protectors
at the base of the tower and then run through EMT (electrical metal tubing)
that is grounded to the tower base *only *and runs all the way from the
tower base to the second floor shack.  The article says the EMT will act
like a *Faraday shield* for the cables inside.

I can understand this approach for the vertical run up the exterior wall of
my house, but does it make sense to use EMT all the way from the tower?
How about the 2? ground strap that will run from the ground protection
system around the base of the tower to my shack.  Following this logic,
shouldn?t it be inside the EMT?

Any help would be greatly appreciated.

Wayne, KK6BT

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Message: 9
Date: Wed, 07 Aug 2013 10:42:49 -0500 (CDT)
From: Gene Smar <ersmar at verizon.net>
To: K7LXC at aol.com, towertalk at contesting.com, patrick_g at windstream.net
Subject: Re: [TowerTalk] Book on Towers
Message-ID: <9249561.1941559.1375890169476.JavaMail.root at vznit170134>
Content-Type: text/plain; charset=UTF-8

Patrick:

I ordered a Trylon Titan 500-64 from Steve in 2001. He was very helpful before and after the sale, answering my questions about my own first tower installation. As for the product itself, if I needed a second medium-duty tower I wouldn't hesitate to buy another Trylon. I built it myself from individual angle pieces (I was able to buy it cheaper broken down into pieces and not factory assembled.)  I am aware of the wind load design limits to the tower and have not overloaded it. It's been up in my suburban back yard since the fall of 2001. Steve and Trylon are a combination worth considering.

73 de
Gene Smar AD3F

On 08/07/13, K7LXC at aol.com wrote:

> I have ordered "Up The Tower" and expect it to be a great source of 
practical information. 

You are correct, sir. 

> I am curious though. With all the positive 
commentary regarding the book and the author that I have read here I find 
it 
interesting that I don't see the brand tower he sells mentioned in emails 
on 
this site. Just curious, what is the "general take" on the towers he 
sells?

Champion Radio Products (K7LXC, Proprietor) mostly sells the Trylon 
Titan self-supporting towers. Best value for the money for a free standing 
tower. I can get Rohn products but they're such a commodity there's no margin 
left in it for us little dealers. 

Cheers,
Steve K7LXC
TOWER TECH
and 
Champion Radio Products
Cell: 206-890-4818
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End of TowerTalk Digest, Vol 128, Issue 31
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