I concur with this. I've drained water out of a lot of those traps
over the years, and in some cases nobody would have thought it was
full of water.
Jeff/KD4RBG
On 9/4/09, Joe Subich, W4TV <lists@subich.com> wrote:
>
> > 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.
>
>
> Check the dielectric in the 20 and 30 meter traps capacitors -
> http://www.telusplanet.net/public/telwest/R7/cushcraft_trap.htm
> http://www.iol.ie/~bravo/r7_vertical.htm
>
> If SWR is correct on 20 meters and up, it would indicate
> the most likely fault is the 30 meter trap - either the
> capacitor dielectric or the coil.
>
> 73,
>
>
> ... Joe, W4TV
>
>
>
>
>
> > -----Original Message-----
> > From: towertalk-bounces@contesting.com
> > [mailto:towertalk-bounces@contesting.com] On Behalf Of Ray
> > Sent: Friday, September 04, 2009 12:42 PM
> > To: towertalk@contesting.com
> > Subject: [TowerTalk] CushCraft R7 Antenna Problem
> >
> >
> > 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
> >
> > _______________________________________________
> >
>
>
>
> _______________________________________________
>
>
>
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