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Padraigh ProAmerica January 10th 12 11:21 PM

Beverage antenna questions
 
The beverage antenna seems to be an excellent mw receiving antenna.

1) Is there a reasonable minimum length?

2) The beveage is supposed to be grounded through a resistor at the far
end. What type of resistor and how much ohmage?

--
"The graveyards are full of indispensible men."--

Charles deGaulle


Geoffrey S. Mendelson January 10th 12 11:44 PM

Beverage antenna questions
 
Padraigh ProAmerica wrote:

end. What type of resistor and how much ohmage?


There are several antenna books which make the same suggestion, so I have
no way of citing the original source.

They all sugest you take a mechanical hour timer and connect a terminating
potentiomiter to the shaft of the timer, start the timer and record the
noise from the antenna. Note where it reaches the minimum.

A more modern possibility is to use two HT's and have one person monitor the
noise, while the other adjusts the resistance.

You probably could do it with a laptop, wifi and skype, but that may affect
the results.

Geoff.


--
Geoffrey S. Mendelson, N3OWJ/4X1GM
My high blood pressure medicine reduces my midichlorian count. :-(



Paul Drahn January 11th 12 01:05 AM

Beverage antenna questions
 
On 1/10/2012 3:21 PM, Padraigh ProAmerica wrote:
The beverage antenna seems to be an excellent mw receiving antenna.

1) Is there a reasonable minimum length?

2) The beveage is supposed to be grounded through a resistor at the far
end. What type of resistor and how much ohmage?

--
"The graveyards are full of indispensible men."--

Charles deGaulle

The answers to all your questions and some you haven't thought of are
answered in ON4UN's book: Low-band DXing. See ARRL for the book. Great
reading any time.

Paul, KD7HB

J.B. Wood January 12th 12 01:31 PM

Beverage antenna questions
 
On 01/10/2012 06:21 PM, Padraigh ProAmerica wrote:
The beverage antenna seems to be an excellent mw receiving antenna.

1) Is there a reasonable minimum length?

2) The beveage is supposed to be grounded through a resistor at the far
end. What type of resistor and how much ohmage?

--
"The graveyards are full of indispensible men."--

Charles deGaulle

Hello, and the chapter "Long Wire and Traveling Wave Antennas" in "The
ARRL Antenna Book" gives theory and practical Beverage antenna designs
for one- and two-wire types. For the case of a one-wire Beverage a
non-inductive terminating resistor in the range of 400-600 ohms is
typical. It should be emphasized, however, that the precise value of
the termination has to be determined by experiment for optimum rejection
of rearward signals. Sincerely, and 73s from N4GGO,

--
J. B. Wood e-mail:


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