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Old January 29th 14, 11:50 PM posted to rec.radio.amateur.antenna
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Default 3/8x24 2 meter mobile

On Wednesday, January 29, 2014 11:15:17 AM UTC-6, R. Scott wrote:


Anyway ... Ill start with 3/4 wave of wire and wrap the 1/2 wave section

in a coil and have the last 1/4 go vertical up the fiberglass ...


That will be way too much coil, and not enough vertical.
I think a 5/8 for 2m is around 48-50 inches or so, depending on
freq. The coil will only be a few turns. If the converted base
loaded CB version is 5 turns, with the thinner glass whip form,
it would take just a few more turns. Like maybe 8 or so using a
thin glass whip form. You could hang a 5/8 length of wire from
something, and then wind a coil on a pencil or something about
the same dia as the whip to get an idea on the number of turns.
The vertical section up the glass must be the correct length.
IE: 48-50 inches. Otherwise it will not be a 5/8 whip.
With a 1/4 wave going up the whip, it's a 1/4 wave with a loading
coil at the base detuning it.




 
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