I am testing the antenna on the ground held on a fiberglass pole about 8
feet long, so the base is about 8 feet off of the ground and I am
holding it up and standing under it.
We have a 15 foot piece of RG8X attached to it. There are no other
things in the path.
That goes directly to an antenna analyzer that makes a graph of SWR. For
+/- 50 MHZ centered at 146 MHz we get a straight line 10:1 SWR.
We moved the tap a couple of times with no changes.
It seems like there are no glued parts that could be assembled wrong.
There is no short from center to ground. I get contact from the center
pin of the PL-259 to the tip of the antenna.
I have completely disassembled the antenna, and am using emery cloth on
all the places metal meets metal. I am wondering what else I should do
before I reassemble since I got it apart.
Kip
On Sun, 2013-03-10 at 20:34 -0400, w4lde wrote:
> Kip,
>
> Where are you reading the SWR from? at the antenna or back in the
> shack? Three is no LP, HP filters, lighting protection devices in feed
> line is there? If so did you eliminate them?.
>
> What happens after you move the tap point on the ring, SWR change?
> Anymore info on how you are testing the SWR would help us.
>
> 73 de
> Ron W4LDE
>
> On 3/10/2013 8:19 PM, Kipton Moravec wrote:
> > I was given a used Ringo ARX2B antenna.
> >
> > I checked out the manual and set the three measurements to 145 MHz. When
> > I tried to tune it, the SWR was 10:1 +/- 50 MHz around 146 Mhz.
> >
> > The piece of coax looked weathered and I checked it out and it was fine
> > with the Ohm Meter and did not seem to change SWR or Ohms when I flexed
> > it. But I replaced it anyway.
> >
> > Found their was no contact through the hair pin to the upper section
> > from the Ohm meter. So I replaced the screws and got a good connection
> > according to Ohm Meter.
> >
> > I checked the connections from the end of the coax to all the points on
> > the antenna, and it worked as expected with the Ohm Meter. No unexpected
> > opens or shorts.
> >
> > When I tried the analyzer, I still had a 10:1 SWR for +/- 50 MHz around
> > 146 MHz.
> >
> > So now I have disassembled everything and an using emery cloth on all
> > the connections and replacing all steel nuts and bolts with stainless,
> > and replacing the brass nuts.
> >
> > What else should I look at before I reassemble?
> >
> > I really do not understand how I could have such a bad SWR unless I had
> > an open or a short -- which I proved I did not have before I
> > disassembled. I am not sure what else to look for.
> >
> > The manual is here:
> > http://www.radiomanual.info/schemi/ACC_antenna/Cushcraft_ARX2B_user.pdf
> >
> >
> > Kip
> > AE5IB
> >
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
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> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
>
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