Simple Ham Radio Antennas--2 Meter Loop Antenna. Post #798.
If you're having difficulty viewing this video, please insert this title link into your browser search box: https://www.youtube.com/watch?v=ZEzSlUqPEWw. Sometimes, a mistake can turn out to be something interesting and useful. In this video from KB3TQO, an experimental 70 cm loop antenna was enlarged by accident and turned into a nice, wide banded loop antenna for 2 meters. As some readers have pointed out, the antenna may be wide banded because of the ferrite balun used in the antenna. At VHF frequencies, this balun will serve as a dummy load, leaving only a few watts or less to become a usable signal. The antenna would be more efficient if the 4:1 balun was made from coaxial cable. However, the antenna tunes nicely, presents a good load to the transceiver, and does get contacts on the 2 meter band. Part of the fun of amateur radio is designing antennas such as this, even if there are significant losses in the design. We learn from our mistakes. With a few minor changes, this antenna will be a winner.
When I was a novice licensee in 1977, my first HF contact on 40 meters (7.125 MHz) was made using a Heathkit Dummy Load. I was testing my HW-101 and was trying to adjust the drive and plate current by transmitting CW into the dummy load, not expecting anything unusual. Lo and behold, a ham a few miles away answered my shaky "CQ" and gave me a 549 report! I was quite surprised by all of this. I managed to carry on a very slow conversation for 10 minutes or so and got a chuckle from the other ham when I told him my antenna was a dummy load. One never knows where your signal will go, even if you use a dummy load just to tune up. So, congratulations to KB3TQO for daring to experiment and having some fun. His antenna works, despite the ferrite balun.
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Aloha es 73 de Russ (KH6JRM).