Johnson's Techworld

What is Duct Propagation of Radio Waves? Duct propagation is a special type of propagation around the curvature of the earth even as much as 1000 km, at

Morse Code for Ham Radio Part 6 So far we have covered up to EISH, TMO, AN, UD and VB till Morse Code for Ham Radio Part 5.

What is a Sector Antenna? Sector antennas are a familiar sight on top of mobile towers everywhere. The name comes from the sector shaped radiation pattern and not

Microstrip antenna is a relatively recent invention, mainly used in microwave band. It is possible to integrate a microstrip antenna along with driving circuit on a common printed

Morse Code for Ham Radio Part 5 In Morse Code for Ham Radio Made Easy 4 we practised EISH, TMO, AN and UD. Now we will add two

Why do you need circularly polarized antenna for working amateur radio satellites? Most of the antennas which radio amateurs use on HF/VHF/UHF bands have linear polarization, either vertical

Homebrewing VHF Yagi Part 4, The Tests! One more hole was drilled in the L shaped metal piece for holding the SO 239 antenna connector to be fixed

Extremely Low Frequency (ELF) for Submarine Communication The lowest frequency allocated to Radio Amateurs in India is the 135.7-137.8 kHz in the Low Frequency or LF band from

Video Tour of ICOM 2730 VHF-UHF Dual Bander Previous post: ICOM 2730 VHF/UHF Dual Band Ham Radio Transcript of the YouTube video tour with still images: Here is