W7TDC article on restoration of the AL-80A RF amplifier. The Ameritron AL-80A uses a single 3-500Z triode to produce over 1KW of power with only 65 watts of drive. I purchased it in the beggining of July 2003. It had several problems when I got it. The tube was bad, a VHF parastitic had occurred,
An AM loop antenna is one of the true marvels of electronics. Requiring no power, it takes advantage of the resonant properties of aninductor and a capacitor connected in parallel to receive weak AM stations. The “loop” part of the antenna is the inductor, and thetuning capacitor makes it resonate at a desired frequency.
The following are construction details of a 5 element 20 meter monobander antenna originally published by VE3GK. However, this particular yagi was run through a computer program and performed very well. It was also scaled to 70 cm on a test range by the late VE3UD, Bud Punchard and the results compared with the computer
G3SYC designed this antenna in about 1990. The antenna works best between 15 and 20 feet off the ground, and can be worked some nice dx with it. The antenna is easily folded up and stored away when not in use, and has a minimal impact when erected . SPACING Inches ELEMENT LENGTH (Inches)
VE3GK posted this interesting project about an HF Mobile multiband antenna. Can be remotely tuned.
A simple 2.4 GHz double QUAD Antenna
This was my first AO-10 antenna. As goofy as it looked, I managed a few contacts with 10 Watts, including Brazil on SSB. This is a pair of 8-element quagi’s, set up for RHCP. Construction is simple, with no critical tuning elements. They are made from 1/2″ PVC pipe and # 10 wire (stripped from
The G5RV multiband antenna is a very popular design on the HF bands. The “common” G5RV is configured as a 3/2-wave dipole on 20 meters, and works as either a shortened dipole, or a collinear-fed long wire on the other bands. In this configuration, the overall length is 102 ft, with a 28 to 34
The Beverage (or “wave”) antenna was invented in the early 1920s by Dr. Harold H. Beverage. It was first discussed in a paper titled “The Wave Antenna – A New Type of Highly Directive Antenna” written by Beverage, Chester W. Rice and and Edward W. Kellogg for the journal of the American Institute of Electrical
Spacing between elements are 34 and 1/2 inches. The elements are 1/2 inch aluminum tubing of 1/16-inch wall thickness.(you can cut up an old TV antenna they work great). The Boom length is 72 inches (6 feet).The boom is 1 and 1/4 inch tubing. You can attach 50 ohm coax to this antenna after you