There are 10 types of people in this world; those who understand binary notation and those who don't. Some years ago I experimented with using a Ground Tuning Unit (GTU a.k.a. Artificial Ground) to replace radials/counterpoises on my field expedient vertical antennas. A GTU is simply a series L-C tuned circuit with a current sensor … Continue reading Improving a Ground Tuning Unit – using binary coded inductance and capacitance
Category: Ground
Posts about radials, counterpoises, Ground Tuning Units (GTUs)
An Improved Self-Supporting, Low Footprint Field Expedient Antenna for 20m
In my post https://hamradiooutsidethebox.ca/2024/02/28/field-testing-the-antenna-called-long-tall-sally-oops-and-downs/ I wrote: Now what if it were possible … … to maintain the small footprint on the ground while simultaneously reducing the height of the antenna. Could it be done? That’s a project I am working on now. I have some ideas that I think are going to work. Stay tuned. … Continue reading An Improved Self-Supporting, Low Footprint Field Expedient Antenna for 20m
Antennas: a Riddle Wrapped in a Mystery Inside an Enigma
I owe the title of this post to Sir Winston Churchill who once used it to describe a country that is prominently in the news at the present time. It seemed an appropriate description for ham antennas too because the more I know about antennas, the more I realize how much I don't know. Maybe … Continue reading Antennas: a Riddle Wrapped in a Mystery Inside an Enigma
A Most Unusual Vertical Antenna for 20m
There has been quite a lot of online discussion recently about minimizing ham footprints, reducing environmental impact and showing respect for other public space users. Parks on the Air (POTA) has been indelicately described as a 500 pound gorilla due to its immense and still growing popularity among hams. As that growth continues there is … Continue reading A Most Unusual Vertical Antenna for 20m
Building a Manpack – Part 1, the Antenna
To start, let me define what I mean by "manpack". My manpack is a manually transportable, rapidly deployable, field expedient complete radio station for operating while pedestrian mobile or pedestrian stationary . The HFpack group of /PM enthusiasts are the experts in operating Pedestrian Mobile. Personally I prefer the Pedestrian Stationary style of operating. The … Continue reading Building a Manpack – Part 1, the Antenna
Year End Review
I am very pleased to learn that Ham Radio Outside the Box appeared in 2 of the top 10 posts in 2023 on Ham Radio Weekly. The post "A strange but proven antenna" occupied 8th place and "A 200ft wire antenna up zero feet" came in at 4th place. Many thanks to Cale K4HCK who … Continue reading Year End Review
An Itsy Bitsy Teeny Weeny Upside Down HF Whip
If the title of this post has you thinking about yellow polka dot bikinis we are probably in the same age range. But today's discussion isn't about ladies' swimwear, its actually about HF antennas. Something has always troubled my mind when I think about very short whip antennas. Take the Elecraft AX1 for example - … Continue reading An Itsy Bitsy Teeny Weeny Upside Down HF Whip
A Very Versatile Unun for Field Operations
Whenever I venture out into the Big Blue Sky Shack - which is often (even in winter) - my entire station has to fit into a backpack. Radio, Bioenno LFP battery, paddles, headphones, logbook, pencils, lapdesk, antennas, stool and all the other bits and pieces necessary to operate out in the bush. Everything has to … Continue reading A Very Versatile Unun for Field Operations
9:1, 4:1, 1:1 or None:None?
When using a Random Wire antenna (also known as an End-Fed Random Wire - EFRW), the impedance at the feed end of the wire is usually higher than 50 ohms. In order to maintain a good match with a transceiver some form of impedance transformation is required to minimize SWR losses in the antenna system. … Continue reading 9:1, 4:1, 1:1 or None:None?
A 200ft Wire Antenna Up Zero Feet – How Does it Perform?
One of my local stores was offering 100ft reels of 16ga insulated wire on sale for a good price. I have bought this wire before and was very pleased with its flexibility - an important factor for field portable use where the antenna is subjected to constant winding and unwinding. The wire extends 200ft across … Continue reading A 200ft Wire Antenna Up Zero Feet – How Does it Perform?
Ham Radio Outside the Box 