Magnetic Loop antenne's. Error 404 - Page Not Found Sorry, but the page or file you were looking for no longer exists. QSL.NET hosts more than 30,000 websites, all maintained by different people, so we will not be able to help you find the page or file you were looking for. We suggest you try to reach the website owner directly, if possible. You might also try an Internet Search to find what you were looking for. If this error is due to a missing file for the QSL.NET web site, then please feel free to contact us to report the problem. Screwdriver Antenna. Remotely tuned, antennas have been around for decades.
Our military and others used them during WWII for HF radio communications. Normally, capacitors and inductors are tuned by electric motors with gear boxes to reduce shaft speed and provide the torque necessary to rotate the component. Spiderbeam© High Performance Lightweight Antennas. Portable HF Transmitting Loop Antenna. November 12, 2004 While HF antennas are not normally known for their small size, magnetic loops can offer quite respectable performance, at the cost of some efficiency and extremely narrow bandwidth.
This tunable magnetic loop antenna is my contribution to the well established art of amateur loop making. It is small and light enough to carry while operating, it disassembles into small but rugged pieces that fit easily in a backpack or gym bag, and it can be tuned from 14 MHz to 30 MHz.