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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