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Re: [TowerTalk] Rotor loop coax

To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] Rotor loop coax
From: "Mel Whitten" <mel@melwhitten.com>
Date: Thu, 23 Aug 2018 14:21:31 -0400
List-post: <mailto:towertalk@contesting.com>
I used a very large and very flexible cable from the commercial welding 
industry to "bond" across my prop pitch rotor.  I never thought about passive 
intermodulation.  
I did this 15+ years ago to help protect rotor from a high impulse (lightning). 
 I used hose clamp and with anti-oxidant.   Black insulation on welding cable 
is beginning to crack some but I keep it coated with clear krylon.   I had one 
impulse from lightning that blew up a camera on the tower and DVR but no rotor 
damage.  W0DQY (SK) told me about this "protection" which he used for his Yeasu 
rotors.    

Mel, K0PFX
www.melwhitten.com 

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of k7lxc--- 
via TowerTalk
Sent: Thursday, August 23, 2018 11:37 AM
To: towertalk@contesting.com; jim@audiosystemsgroup.com
Subject: Re: [TowerTalk] Rotor loop coax

 
>  W3LPL has alerted us to the fact that passive intermod is often

generated within rotor housings, the solution for which is to bond around the 
rotor. What do you recommend for making the connection to the mast above the 
rotor? 
 
    I dunno. What does the new N0AX grounding book say? My answer would 
probably be to use some sort of stranded insulated wire with a hose clamp on 
the mast and the bottom end connected to the tower - connection type your 
choice with some anti-oxidant on each end. 
 
    To be honest I've never done this. 
 
Cheers,
Steve     K7LXC
TOWER TECH -
Professional tower services for amateur and commercial 
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