[Johnson] G5RV info request

[Joel R. Hallas]

Gents,

I am a happy G5RV user, but think I should point out something about both the
G5RV and the various Windom antennas. These antennas happen to have various
frequencies at which they have a somewhat reasonable match to 50 ohm coax,
however, at most frequencies they have a rather high swr, perhaps 5:1 to 10:1.
This will look lower at the transmitter end of the line due to the loss of the
reflected signal getting to the bridge.

Take a look at Fig 14 of Chap 24 in the current ARRL antenna book and see the
additional loss in coax as a function of swr. For example foam RG-58 has a loss
of about 1.5 dB/100 ft when matched. An SWR of 5:1 will add another 1.5 dB so
half the power will not get to the end of the coax. It gets progressively worse
when the SWR gets higher.

After measuring the SWR from my G5RV, I replaced my small coax with 9913 which
improves the situation but doesn't eliminate it.

The Windom seems to work best in those areas with good ground conductivity where
the vertically polorized radiation from the feed can help. For those of us with
rocks under the antenna, Horizontal is still best for any height.

Just my $.02

Joel Hallas, W1ZR

Brian Hunsaker wrote:

> At 7:49 PM -0700 1/2/04, KENNETH A CRIPS wrote:
> >Before you purchase the AES G5RV take a look a the link below this outfit
> >makes the best
> >wire antennas I know of.  Their G5RV is the best "store bought" G5RV in know
> >of.
> >However the Carolina Windom they make is hands down a better antenna
> >
> >http://www.radioworks.com/PDFantenna.html
> >
> >                                  Ken
> >
> >
> >
> >
> >Kenneth A. Crips Station W7ITC Cheyenne, Wyoming.
> >
> >_______________________________________________
> >Johnson mailing list
> >Johnson@mailman.qth.net
> >http://mailman.qth.net/mailman/listinfo/johnson
>
> I just purchased a Windom (80 - 10 version, 132') from Antennas and
> More - (www.antennasmore.com), and it is a real killer.  I am getting
> great reports on 80, 40, 20, and they are all without a tuner. In
> fact, it loads up on 20 better with out a tuner, than if you put a
> tuner in the line. Mine is about 35' above the ground.  Price - $122
> with shipping. They have G5RVs also, but I agree with Ken that the
> Windom is a better aerial.
>
> My two cents,
>
> Brian - W5YE
> --
> r. b. hunsaker
>   ***  The Ark was built by an amateur - the Titanic by professionals.  ***
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