It’s been a while, but I finally have put together another video. It starts a new series on small transmitting loops (“magnetic loops”), the workhorse type of antenna at my station. These antennas are a great option for working on HF when you have very limited space. Part I of the series gives introductory information and how to do the calculations to design a loop that works for your situation. Later videos will show how to build and use this type of antenna.
I finally finished off the 6-meter Yagi project and got it on the air. I’ve actually been using it for a while, but needed the ARRL VHF contest to get enough activity on the band to shoot video in a reasonable amount of time showing me making QSOs. I was running 50 watts into the 4-element Yagi and worked sporadic-E clouds to 30 different Maidenhead grids, including two in New Hampshire, which were my first double-hop sporadic-E QSOs. Enjoy!
Wow, it seems like just a year ago that I posted my first video! Okay, it actually was a year ago. This video is a how-to guide for audio processing of FM broadcast band recordings to make it easier to find and easier to hear sporadic-E and meteor scatter propagation.
Now that I’ve been working on ham radio antennas, I have a couple of projects for the video blog. The first one is a 6-meter 4-element Yagi. It is designed to be semi-portable, and for me this is particularly important because it’s not practical for me to leave up an antenna for any significant length of time. Perhaps impudently, I am posting this introduction and design video before I actually have the antenna on the air! However, I have tested the antenna itself (sans 1:1 balun) with a VNA and it seems to behave more or less as expected.
I spend a lot of time talking about various design parameters and the actual modeling procedure, so this may seem a little dry if you’ve done this before. But, I try to keep my speech pace relatively slow on these videos, so there’s always the 1.25x and 1.5x speed options on YouTube. Part II will detail the construction process, and Part III will show testing and hopefully actual on-air performance.
The third part of the Superloop antenna series is up on YouTube (and has been for a while, I forgot to announce it here). This part goes into detail on the impedance matching transformer needed to deliver a high percentage of the signal from the high-impedance antenna to the 50-ohm feedline.
Episode 2 of my video blog has been posted to YouTube. This is the second video in the Superloop antenna series, and shows the construction of a decade resistance box to use as the terminating resistance of the antenna. The box allows you to repeatably set the resistance to the value you want, as opposed to trying to make fiddly adjustments of a potentiometer. This part of the project went well, other than it having a 2 ohm offset due to resistance in the thumbwheel switches, wires, and banana plug connectors. Enjoy!
Finally! My first Arizona Signal Watcher video blog episode is now available on YouTube. This is the first of a several-part series on the “Superloop” receiving antenna. This design was developed by Bruce Conti and this is my take on the design and construction. The antenna is very useful and convenient when needing a signal null in one direction and good reception in other directions, and when portability is important. The first video is entitled “Superloop Antenna Part I: Introduction” and gives an overview of the antenna design and some theory behind it. Subsequent videos will detail the construction of the antenna and the electrical/electronic components needed to optimize the antenna performance. Comments here or on the YouTube page are very much welcomed. Enjoy!