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Old May 12th 07, 02:03 PM posted to rec.radio.amateur.antenna
Dave Dave is offline
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First recorded activity by RadioBanter: Jul 2006
Posts: 797
Default Long inverted V not working well, why?


"Rick (W-A-one-R-K-T)" wrote in message
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I just put up an inverted V that is up about 70 feet in the center and
about 15 feet at the ends. Each leg is about 130 feet long, or about 260
feet overall, which is right around a half wave for 160 meters. It is fed
with ladder line and an LDG auto-tuner.

I also have a dipole antenna that's up about 17 feet and is a half wave
for certain MARS / CAP frequencies above the 75 meter band, hence it's a
bit short for 75 meters. That antenna is coax fed and goes through a
different LDG auto-tuner which allows me to use it on 75/80 meters with a
good match.

The long and high inverted V doesn't work any better than the short and
low dipole, and in some cases doesn't work as well.

I have checked all the connections on the inverted V and even did a
continuity check from each side of the ladder line, up through the feed
point, out each leg to the end of each leg, and all seems OK.

I have tried switching auto-tuners (taking the one that's on the coax-fed
dipole and putting it on the inverted V) with no discernible difference.

Seems very strange. Any ideas that might account for why the V doesn't
work better?


you left out many details.
1. on what band did you do these tests?
2. what where your criteria for evaluating 'better'? swr, rx noise, rx
signal strength, tx field strength, tx signal measurements by someone at
some distance from you?
3. at what distance were the stations you compared, if that is what you did?
4. at what time of day/night, and on what date (important if there was some
kind of geomagnetic disturbance or some other propagation anomaly that day).
5. over how long of a period of time have you made these observations?
6. in what directions were the stations relative to each of the v's?
7. how close together are the v's?
8. what is supporting the v's?