VU2JO Jon

Many radio operators use the terms Resonance and Impedance Matching interchangeably, but they describe two different electrical conditions. Confusing them can lead to misleading SWR readings, inefficient power transfer, and even damaged equipment. youtube.com/shorts/8RfRxFd…

Full wave loop antenna is also known as self-resonant loop antenna and large loop antenna. Other loop antennas are halo antenna and small loop antenna. Perimeter of full wave loop antenna is slightly more than a full wavelength of the operating frequency. youtube.com/shorts/d7AqJD5…

Tropospheric Scatter Propagation is known in short as Troposcatter Propagation. Troposphere is the lowest layer of the atmosphere. Though Troposcatter is typical at microwave or super high frequency or SHF band, it can also occur at VHF and UHF bands. youtube.com/shorts/nQzWJHU…

Hexbeam or hexagonal beam is a directional HF antenna popular among amateur radio operators for DX work and contests. AT3K group of contesters for CQWPX contest 2023 from National Institute of Technology Karnataka had used hexbeam for higher bands. youtube.com/shorts/Xh-ebzz…

Ferrite Rod brings back nostalgic memories of childhood when it was shown to me inside our old transistor radio by none other than my father, who was neither an electronics expert nor an amateur radio operator. youtube.com/shorts/IBquwtF…

Collection of my garden videos. Compiled for the convenience of viewers. youtube.com/shorts/Kh470k5…

Continuation of my garden panorama. The names of this set of plants are approximations from web searches. As they were procured years back from a local nursery, the actual names are missing. Sedges are a type of grass like plants with inconspicuous flowers youtube.com/shorts/6uvW4rB…

The leaves which were maroon coloured with a pinkish border has started developing green colour in the center of new leaves. When exposed to high light intensity Coleus increases anthocyanin amount and decreases chlorophyll content. youtube.com/shorts/wtXtFD0…

Cordyline or Ti Plant is very easy to grow at home. They are quite sturdy and grow with very little care. One variety is also called Hawaiian Ti plant or Good Luck Plant. youtube.com/shorts/dCcQB8A…

Read somewhere that carrot plants flower only in the second year after a winter. Here is my carrot plant flowering in four months. A few ants are also seen, hopefully acting as pollinators. youtube.com/shorts/GS5vjtb…

5/8 λ Vertical Antenna has a length a little more than the usual quarter wave length vertical antenna. It has a similar low angle of radiation useful for local contacts. Hence it is a popular form of mobile antenna which can be mounted on a car. youtube.com/shorts/g30SXtG…

Standing wave occurs when there is impedance mismatch between the transmission line and the load, which is the antenna. When there is an impedance mismatch, part of the signal is reflected back to the transmitter. youtube.com/shorts/awUtl50…

J pole antenna is a vertical omnidirectional antenna popular among Ham Radio operators for 2m and 70 cm operations. youtube.com/shorts/_1HXuaM…

Duct propagation is a special type of propagation around the curvature of the earth even as much as 1000 km, at VHF and UHF frequencies. This occurs when there is a temperature inversion in the troposphere. youtube.com/shorts/oVv9bFZ…

There are several versions of multi-band inverted L antennas out there. I thought of describing a center fed one and an end fed one. Center fed one has been described by W4RNL and end fed one by VK6YSF. youtube.com/shorts/fb50J-F…

Digital Mobile Radio (DMR) has completely transformed the VHF/UHF landscape in amateur radio. Originally developed by European Telecommunications Standards Institute for commercial use, hams adopted it because of its spectrum efficiency...youtu.be/PywOgx3L_0c

The definitive peak—or "solar maximum"—of Solar Cycle 25 occurred in October 2024. At its peak, the cycle reached a maximum smoothed sunspot number of roughly 161. youtu.be/8pe-9Fzf4L8

Designing an End-Fed Half-Wave (EFHW) antenna for 80m through 6m is an excellent homebrew project. It naturally resonates on the harmonic bands. youtu.be/Tb6tAnlzm6Y

Growing beetroot in garden pots is incredibly rewarding, but in a tropical climate with distinct heavy monsoons and intense summers, your biggest challenge isn't space—it's temperature and timing. Beetroots naturally prefer cooler weather (15–25°C). youtu.be/mGY19Af8WtQ