Saturday, July 6, 2019

Coax-Fed Multiband Dipole. Post 1920.

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In this video from Stan Gibilisco (W1GV), we see an "elegant but fragile solution to a common conumdrum"--making a monoband dipole antenna capable of operating on several amateur/ham radio bands with only one coaxial cable feed line.

With the aid of an antenna transmatch (i.e. "tuner") and a carefully chosen length of 50 ohm coaxial cable as a feed line, it's possible to cover a few HF bands without too much loss.  Many of us, myself included, used this arrangement when we needed a simple, inexpensive antenna to get on the air.  This arrangement worked fairly well, if one chose 40 meters as the basic antenna.  Even without a "tuner", a 40 meter dipole could give passable performance on 15 meters using the third harmonic of of 7 MHz.

As Stan points out, the antenna works fairly well, considering the mismatch found on the remaining amateur/ham radio HF bands.  Stan does a good job of exploring the pros and cons of this basic dipole antenna. In a later post, Stan will show us how to get better performance and antenna matching using a balanced feed line.

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Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).

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Aloha es 73 de Russ (KH6JRM).