Description:
Antennas: theory, techniques and construction.
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Alliance Tenna-Rotor for sale
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I have an Alliance Tenna-Rotor model T-20 with control box for sale. It has about 87 feet of 4 conductor cable that goes with it. It can be viewed at: [link] or [link] I'm asking $30 plus shipping CUS.... more »
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Art's quiet mesh antenna
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Bill wrote: ...Based on his "designs", which don't seem to exist except as whimsical nonsense, I would wager large amounts of cash that you couldn't possibly have a QSO with him. tom K0TAR
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Lossy Coax: how is energy lost ?
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In a lossy coax the lost energy is, I suppose, heating up the dielectric. To try to visualize that I stripped off 30 cm of dielectric from an old RG58 cable and put it in a 900 W 2450 MHz standard microwave oven together with a 100cc cup of water as dummy load. 2 minutes after switching on the water was boiling but the polyethylene was... more »
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Parallel tank circuit
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A tank circuit represents an antenna closed circuit where in the absence of friction shows the action of electric field changing to a magnetic field as a sample of perpetual motion. However perpetual motion does not exist so to account for all forces involved we have to determine the amount of friction. We cannot use a series circuit as we... more »
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Follow Up On Coax & Connectors To Use
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Hi, Just a bit of a followup from my previous post. Am in my 70's now, and not too sharp with this stuff anymore. But, I really enjoy sw listening. Doing some re-plumbing. The suggestion was made that the common RG-6 that is everywhere would do me just fine, as I'm talking about about 3 foot patch cord lengths.... more »
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Mesh curtain antenna
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My latest antenna is up! It is a window mesh curtain 8 foot by 100 foot about 1 foot off the ground. It is an all bander with the xmitter tuner on all the time, later I will trim it so I can leave the internal tuner off. At the moment the red light comes on when I am right in the center only of the top band and the SWR reads 1.5 for the middle section only!.... more »
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Alliance Tenna-Rotor for sale
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I have an Alliance Tenna-Rotor model T-20 with control box for sale. It has about 87 feet of 4 conductor cable that goes with it. It can be viewed at: [link] or [link] I'm asking $50 plus shipping CUS.... more »
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Turn an FM Transmitter into a Micro Pirate Radio
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Corporate radio is preprogrammed junk. But don’t curse the DJ; seize the airwaves! With a soldering iron and a cheapo FM transmitter — the kind used to play an iPod through a car radio — you can transform your humble Honda into a Radio Free Civic that can broadcast your tunes up to ... 100 feet.... more »
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