[TowerTalk] Rotor loop coax

[Mel Whitten]

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 at contesting.com] On Behalf Of k7lxc--- via TowerTalk
Sent: Thursday, August 23, 2018 11:37 AM
To: towertalk at contesting.com; jim at 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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