Classic G3TXQ Balun / Choke Article

Excellent technical reference article by Steve G3TXQ:

choke_impedances_g3txq

Amateur Radio (G3TXQ) – Common-mode chokes

The above chart presents the results of impedance measurements made on a variety of common-mode choke implementations across the frequency range 1MHz to 30MHz. Amateur frequency allocations are indicated approximately by the vertical grey bands. Continue reading Classic G3TXQ Balun / Choke Article

4,876 total views, 1 views today

Non-Resonant 25 ft Vertical with Metal Fence Counterpoise – 7 Bands

With the interest in 43 foot untuned verticals, and some of the less than accurate claims being made, I thought I’d share the results of a 25 foot untuned vertical antenna I developed a few years ago. Hopefully, I can shed some more light on its practical use, as well as show how to gain a bit more performance.

Continue reading Non-Resonant 25 ft Vertical with Metal Fence Counterpoise – 7 Bands

3,481 total views, no views today

Classic Amateur Radio (G3TXQ) – Cobweb Antenna

Excellent technical reference article by Steve G3TXQ:

G3TXQ-tn_cob9

During recent range testing of a hexbeam I needed a horizontally-polarised resonant antenna covering 20m thru 10m which could be assembled and disassembled quickly and easily. The cobweb antenna meets the requirement nicely – it comprises 5 parallel dipoles bent into a square shape and mounted on a support structure made of fibreglass poles.
Continue reading Classic Amateur Radio (G3TXQ) – Cobweb Antenna

1,675 total views, no views today

Classic Amateur Radio (G3TXQ) – G5RV Antenna

Excellent technical reference article by Steve G3TXQ:

Few antennas polarise opinion as much as the G5RV – it seems you either swear by it or swear at it! The purpose of this article is to present a few technical facts about the antenna and allow the reader to judge whether or not it might be useful for them.

G5RV Antenna

Continue reading Classic Amateur Radio (G3TXQ) – G5RV Antenna

1,352 total views, no views today