The VHF Quagi from an article by Wayne Overbeck, K6YNB in QST April 1977; “Building a 440MHz Quagi” description is from Gary Bonnor – VK4ZGB There have been many half-hearted attempts to combine a Yagi … Read More
Software allows the production and detection of signals used for transferring SSTV pictures. Most SSTV software allows for both sending and receiving SSTV signals, with the ability to auto-detect which mode is being received. A … Read More
Simplified ionospheric models portray the ionosphere as a series of horizontal layers that vary with time, location and sunspot activity. The real ionosphere is much more complex than this, particularly in equatorial and polar regions. … Read More
A small transmitting loop, small tuned loop or magnetic antenna is defined as a loop antenna of less than one-tenth to one-quarter of a wavelength in circumference. These are normally constructed as a single turn of heavy-gauge wire (AWG #10 or larger), … Read More
Basics of Cavity Filter Cavity filters are the basic circuitry behind a Duplexer and are sharply tuned resonant circuit that allow only certain frequencies to pass. Generically, filter of this kind is known as notch filters. … Read More
What is Phonetic Alphabet? A number of phonetic alphabets exist. The NATO version is most common and can be considered to be the “international” phonetic alphabet. Letter Code Word Pronunciation A Alfa AL FAH B Bravo … Read More
Related wiki pages FAQ When adding information to these pages, please link to other pages in the wiki wherever possible. A AC: Alternating Current ADC: Analogue to Digital Converter. Also known as A/D and A-to-D. … Read More
Basics The troposphere is the layer of the atmosphere closest to earth. It is approximately 10km deep on average but can extend to 20km in tropical areas. Tropospheric propagation occurs when signals are reflected scattered or … Read More
The Rag Chewers Club, traditionally an introductory amateur radio award, was issued to the operators of thousands of amateur radio stations and many long-time operators can proudly claim to have received it as their first award in … Read More