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.
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.
For this episode, I shot about 2 hours of video of me casually working the 20-meter band on a Saturday with a contest and two state QSO parties in progress, editing the video down to under 30 minutes. I comment on what I’m hearing, make a few domestic QSOs, one QSO with France, and unsuccessfully work Italy. All with 80 watts into a homebrew magnetic loop antenna. Enjoy!
I’m still working on the second part of the 6-meter Yagi video series, so I decided to show an example of trans-Pacific AM broadcast band reception using the RTL-SDR based AM BCB receiver detailed in Episode 006. This was from an SDR recording on the morning of September 21st, 2016 and was a pretty good session. Unfortunately, the audio was rather uneven because I was trying for the first time to “internally” record my laptop screen instead of shooting with the video camera. That part worked great, but the audio didn’t go quite as well. Still, this gives a nice flavor for what I have been able to from Arizona with the RTL-SDR based AM BCB receiver, and the Conti Superloop antenna featured in earlier videos.
Forgot to put this up earlier, but Episode 006 of my Arizona Signal Watcher video blog is up. This one is a brief “tour” of the RTL-SDR based receiver that I use for AM broadcast band DXing. If you think you need to spend several hundred dollars to do well on the AM BCB, you might want to have a look. A $20 RTL-SDR, plus a $45 upconverter, and maybe some amplification (depending on your antenna), and you may do as well as possible considering the crowding on the band and other issues.
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!