[TowerTalk] Trying to test out my old 40 meter cushcraft

[Jim Rhodes]

If that isn't possible at least point it straight up and get it as far off
the ground as you can. Resonance will still shift up some.


Jim Rhodes
K0XU

On Feb 23, 2018 06:49, "Herbert Schoenbohm" <herbert.schoenbohm at gmail.com>
wrote:

> Dave,  Checking a 40 meter beam that close to the ground will drive the
> best frequency way down the band even below 7.000.  You need to get the 40
> meter beam up at least 50' to get any reasonable results.
>
> Herb, KV4FZ
>
> On Thu, Feb 22, 2018 at 8:38 PM, Dave Thompson <thompson at mindspring.com>
> wrote:
>
> > Gang, Ray
> >
> > I got a 59 foot run of RG8X from the wireman 10 years ago and added the
> > nice 1 to 1 balun.  The first problem I had was the PL259 on the RG8X
> would
> > not match up with the S)239 in the Balun. I tried a ABR 3 foot jumper
> that
> > I had installed in the shack and the rG8X went into the barrel connector
> OK
> > but again the jumper just would not match up with the sO238 in the balun.
> > I found a nice Amphenol 4 foot jumper and it works nicely with the S)239
> in
> > the balun and the barrel connector at the end of the RG8X.  Total length
> is
> > 54 feet connected to the SWR bridge at the test transceiver.
> >
> > First test on 7150 showed 2.4 SWR and I tuned the transceiver down and
> > found the SWY was lowest at 7002. I moved the reflector element 10 feet
> > away from the back side of the driven element and SWR was lowest at 7055.
> > I have a chain link fence about 4 feet away from the tip of the Driven
> > element. I then figured away to lift the end up about 3 more feet and the
> > SWR is lowest (1.  2) at 7080. I will have to hoist the element up with a
> > rope about 10 feet (currently at 12 feet. I did check the measurements
> and
> > it is set for 7150.
> >
> > I am most worried about the SO239 in the balun that may not match the
> > tower guys new coax I got at HRO. Are others having problems with new
> > SO239's like I am having?
> >
> > If I raise the DE to 22 feet what should I see on 7150. The antenna will
> > go up to 82 feet on the tower. I hooked the MFJ-259B to the 4 foot jumper
> > and lowest resonance is 7160 but at just at 2 to 1. I am going to test it
> > Friday at 22 feet but what should I see at 82 feet with the reflector in
> > line?
> >
> > Thanks for any ideas...
> >
> > 73 Dave K4JRB
> >
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