[UK-CONTEST] Inverted V help

[Cooper Stewart]

Hi John,
I would, initially anyway, get rid of the balun until you have a resonant
antenna. I use an inverted V on 80m just now, with only 5 ferrite cylinders
on the feeder. No ATU either. It's got a narrow bandwidth, but it gives me a
good match. I keep little pigtails in the store for CW and RTTY parts of the
band and just use a choc connector to attach them to the wire element ends
when required! Great antenna.
Good luck,
Stewart  GM4AFF
PS I think we all gravitate downwards in frequency. I even worked W5UN in
the ARRL on 40m last weekend! See you perhaps next Sunday in the 4m
Cumulative.

-----Original Message-----
From: john lemay [mailto:john.lemay at which.net]
Sent: 18 February 2003 12:34
To: uk-contest at contesting.com
Subject: [UK-CONTEST] Inverted V help


Hello all

In one of my very rare forays below 50MHz, I decided to try an inverted V
for 80m. It would use my modest Versatower for the central support, and the
ends would end up where-ever.

I knew it would be a compromise :-

I probably could not get enough height
I probably could not get the right apex angle
One end in particular would need to be close to the house and bent through
90 degrees
The other end would be in trees.

Even so, I thought that at least I would get an antenna that would be within
the limits of a typical internal ATU on my rig.

Wrong !

It received quite well, and nicely quiet compared to my HF6V. But the match,
checked out on the MFJ analyser was about 10 to 1. I have done the obvious
tests, such as continuity of wire, continuity through balun etc.

Today, I have taken down the 1:1 balun (Watson) and checked it out with a
resistor across the terminals. Interesting: - Using a 50ohm resistor which
is suitable for low frequency rf use, the match through the balun at 3.0MHz
is about 2 to 1. It gets worse going lf, and improves to 1.2 to 1 by about
10MHz. Then not surprisingly above 40MHz the match gets lots worse.

What I need help in deciding, is whether my abysmal match with something
resembling an inverted V is due to too many antenna compromises or is it due
to a dodgy balun ? (Preferably without too many more sessions freezing in
the garden, or hauling the tower up and down).

Regards

John G4ZTR




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