[Antennas] Cushcraft R7000 repair

[David J Windisch]

It is not easy to clean up a manufacturer's mechanical design.
Bad contacts are not limited to those you can see.
CC uses steel against copper against aluminum, and on various antennas, I 
have had to cut off, or at least into, the shrink-tubing boots, in order to 
reconstruct corroded rivet and self-tapping-screw joints and connections, 
and then put new h-s tubing on.
Put Penetrox-A13 on any reconstructed joints.
Another CC assembly quirk is to make right-angle bends, with little or no 
radius, in wire conductors.  Vibration or whatever can cause the wire to 
break at the bend.

73 Dave N3HE

----- Original Message ----- 
From: "Yong Surk Lee/HL1FB" <yonglee at yonsei.ac.kr>
To: <Antennas at mailman.qth.net>; <Boatanchors at mailman.qth.net>
Sent: Tuesday, September 18, 2007 3:25 AM
Subject: [Antennas] Cushcraft R7000 repair


> Hello;
>    My R7000 antenna started to show high SWRs on all bands. I cleaned all 
> contacts but it
> did not solved the problem. It looks like the traps or the matching box 
> are possible source of
> the problem.
SNIP