[Antennas] CushCraft R-7 problems

[Robert G Strickland]

My antenna is an R8, not an R7. So much for knowing what I'm doing!

On 12/27/2015 18:29, Robert G Strickland wrote:
> I have put up a CC R7 and can't get it to "work." CC has replaced the
> match box. Twice, I have taken it down, cleaned all connecting surfaces
> and put it back up. I have a lot of mechanical experience, and I'm
> generally satisfied that I assembled it correctly. Using an MFJ256B at
> the antenna, there is no resonant frequency dip on 30m, 17m, 15m and
> 12m; on these bands the SWR is generally flat in the 2.5 to 7.5 range.
> On 40m there is a distinct dip at 7.05 MHz with SWR 2.5:1. On 20m there
> is a distinct dip at 13.850 MHz with SWR 2.5:1. On 10m there is a dip at
> 27.500 MHz with SWR 2.3:1 . Also, when taking these readings there was a
> slight breeze and the SWR measurements were extremely unstable even
> though the vertical is guyed just below the traps. Aside from the usual
> comments about verticals and CC in particular, these results seem way
> out of line to me. A local ham has one, and using the 256B shows results
> that generally agree with those in the back of the assembly
> instructions. Any suggestions much appreciated. Happy New Year to all.
>
> ...robert

-- 
Robert G Strickland, PhD ABPH - KE2WY
rcrgs at verizon.net.usa
Syracuse, New York, USA