Johnson's Techworld

What is a Helical Antenna? Helical antenna, as the name implies, is an antenna in which one or more conducting wires are wound in the form of a

What is a Log-periodic Antenna in Amateur Radio? Log-periodic antennas are typically used for VHF and UHF frequencies. There are radio amateurs who have built it for 20-6m

What is a Bazooka Balun? Balun stands for balanced line to unbalanced line, typically connected between a balanced antenna and an unbalanced feeder coaxial cable. Bazooka balun is

Cobweb Antenna is a small, light weight, multiband antenna, typically covering five ham radio bands from 14 MHz to 28 MHz. Cobweb antenna requires only one support and

My First Attempt to Hear GreenCube Failed, Why? I have been able to listen to the digipeater signals from International Space Station during its pass overhead even though

How Will VHF Ham Radio Antenna Perform on UHF? It is well known among Ham Radio operators that a 7 MHz dipole antenna will work at 21 MHz

ജെ പോൾ ആന്റിന 2 മീറ്റർ, 70 സെന്റീമീറ്റർ പ്രവർത്തനങ്ങൾക്കായി ഹാം റേഡിയോ ഓപ്പറേറ്റർമാർക്കിടയിൽ പ്രചാരത്തിലുള്ള ഒരു വെർട്ടിക്കൽ ഓമ്നിഡയറക്ഷണൽ ആന്റിനയാണ് ജെ പോൾ ആന്റിന. ഇത് ഒരു എൻഡ് ഫെഡ് ആന്റിന ആയതിനാൽ, ആന്റിനയുടെ ഹാഫ് വേവ്

Is Monopole Antenna Used in Ham Radio? All of us are familiar with various types of dipole antennas like inverted V and horizontal dipole antennas. What about monopole

What is a Whip Antenna? Whip antenna is a common sight on four wheelers these days as most of them have a built in radio, often covering FM

Checking SWR with a Cross Needle SWR Meter Checking SWR using a patch cable to connect the SWR meter between the radio and the antenna was discussed earlier.