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beverage
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Basics
General info on the Beverage
How to
Get a perfect Beverage
Wires
How thick, what material?
Feed
From radio
to antenna
Ground
Ground and terminate
— here's how
Remote
Remote control of the Beverage
Views
Love letters about life with
a Beverage |
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Two
wavelengths near optimum
By Earl Cunningham, K6SE
Topband Antenna mail list, October
18, 2000
A specific length for a Beverage antenna is not "optimum" unless
it is the length where the signal in the air and the signal in the
wire are 90 degrees out of phase. This "optimum" length is about
2 wavelengths, depending on the velocity factor in the wire. Beverage
antenna gain will decrease if one goes beyond this length.
However, going beyond this length will improve the antenna's F/B
and F/S ratios, perhaps improving its S/N ratio. I feel that Ford's
tables would be much more useful if they included the S/N ratio
of the antenna as its length increased. To do so, both the antenna
gain and its pattern would have to be taken into account.
The goal on the low bands is to have an antenna with a good receive
S/N ratio. That antenna is not necessarily the one with the most
gain. |
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