Topband: First attempt at beverage antenna, not working as expected
kl7ra at ptialaska.net
Sun Jan 16 01:05:33 PST 2011
> My first beverage, I was expecting better results.
Most will mention 250 feet is too short and that might be the reason as it
will not match 9:1 or that 450 Ohm resistor.
A working beverage is easy to recognize as the noise drops to zero and signals
really "pop" out of the noise. They are magic antennas when they are built
correctly and I can tell quickly when one has a problem.
I suggest measuring the antenna with a MFJ 259B and check the SWR. All
mine run around 2:1 from 1.8 to maybe 2.2 Mhz. If the SWR is high and
the coax and all connections are okay I would change the length some how
to 500+ feet or use one of the variable transformers with its variable resistor
package sold by some companies that sell Beverage electronics.
By the way I built a new Beverage this winter and it didn't work, excess SWR.
I found the new 500 ft spool of RG-6 from Home depot had a bad spot in it
where there spliced the cable by a simple overlap of the braid.
73 Rich KL7RA
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