[TowerTalk] 80 meter quad loops
jimlux at earthlink.net
Fri Nov 4 08:42:49 EST 2005
At 05:28 AM 11/4/2005, Cqtestk4xs at aol.com wrote:
>For the last few years I have been using four sets of rope supported quads..a
>two element facing JA, a two element facing VK, a two element facing SA, and
>a four element facing EU. All are tuned for the SSB part of the band.
>To operate CW contests, I lower the ends of the ropes supporting them screw
>in the extra pieces of wire, and raise them again. It's a pretty simple
>but it doesn't solve the day to day excursions into the CW band.
>The loops are actually flattop delta loops so the pointed end faces toward
>the ground. The ends either have coax at the bottom or a rope at the
>keep it from blowing around.
>So what I would like to do is to put a relay and a coil at the bottom of each
>element to make the element resonant around 3725. They are currently
>resonant around 3775.
What about making the reflector longer, and then switching in a capacitor
to make it electrically smaller. Much easier to get an adjustable
capacitor than an inductor. One could potentially just hang a short piece
of coax or twinlead off there and trim it back until the tuning is right.
More information about the TowerTalk