[TowerTalk] CushCraft R7 Antenna Problem

[Ray]

Recently I tried running about 600 - 700 watts to my old reliable Cushcraft
R7 vertical. Everything went fine on 20m, but when I went to 40m the SWR
became erratic, then jump to a very high level and stayed there (more than 6
- 8:1). The RX is also quite numb on 40m. The same high SWR is on 30m too.
20m is still has a good low SWR. 

 

It seems that there is an open or something bad at the 30m joint or coil,
but a visual inspection and ohm meter check show every think OK. I have not
yet opened the matching box at the base. I did remove the heat shrink at the
30m coil connects, but those connects are fine with no burn spots along the
coil.

 

Any ideas or suggests as to how to track down the problem? Sometime today or
tmw, I will look inside the matching box to see what I can find. But if
anyone as any experience or suggests, please let me know.

 

Ray, N6VR