On 8/27/2012 4:15 PM, Missouri Guy wrote:
> The traps on my Hy-gain antennas are "sorta molded"...
> they use a threaded plastic form for the coil, then the
> outer metal sleeve becomes the "capacitor" which is
> connected to one end of the coil. That forms the parallel
> tuned circuit, which is often tuned below a particular band
> to avoid very high voltages at the operating frequency.
My "old" hy-gain antennas from back in the 70s had blue, molded traps.
The driven element also mounted to the boom via, round, molded fittings
forming a center fed dipole via a balun. IIRC I saw some of those used
to form a tri-band vertical.
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