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About KK5JY

Most people call me "Matt."

Favorite Activities

I spend most of my radio time doing...

  • Antenna Design, Modeling, Construction and Experimentation
  • Casual HF Contesting
  • CW and Digital Modes
  • HF Mobile Operation

...and combinations thereof, mostly on 160m through 20m.

Station Antennas

At home, my current set of transmitting antennas includes:

  • A custom STL (see photos below, at right) for 30m, 20m, and 17m.
  • A 43' wire vertical antenna on fiberglass, matched with an SG-230 for 160m, 80m and 40m.

Loop Projects

For several years now, I have been experimenting with compact transmitting loops. The performance of these antennas has been quite good, on par with resonant vertical antennas. Many of the lessons learned from building and operating them can be found on my loops page. I have also published an automatic tuner project for these antennas, available on the AutoCap page.  Below are loop antennas for 80m through 6m.

80m/40m QRO STL20m STL (foreground); 15m STL (background)6m STL

Performance Receive Antennas

More recently, I have also been experimenting with different forms of optimized HF receive-only antennas, especially for the lower bands, where noise levels tend to be higher.  These designs have turned out to be very helpful when contesting on 40m, 80m, and 160m.  The main idea is to provide a signal-to-noise ratio that is better than what can be achieved with typical transmitting antennas.

So far, I have tested two different families of antennas:

Such antennas can have performance comparable to long Beverage antennas, but occupy a fraction of the space.  They can be deployed individually, which approximates the performance of an unterminated beverage antenna, or in phased pairs, which approximates a terminated beverage.  All of these antenna projects use untuned (nonresonant) elements, which helps to optimize the signal-to-noise ratio of the recovered signals.

I have specifically avoided working on Beverage antennas, mostly because they are well-studied devices.  I'm trying to focus on alternative designs that are less well-known, and can offer similar performance in smaller spaces.

Embedded Projects

I have enjoyed tinkering with Arduinos, and exploring how much can be done with a very inexpensive microcontroller circuit.  There are several embedded uC projects available on my site:

Commercial Licenses

A few years ago, I updated my résumé with General Phone and GMDSS commercial radio licenses.  I also wrote some flashcard software to help me study the entire question pool for these licenses, and the software now supports amateur elements, as well.


Here are some ham links I would recommend:

Everything HF Mobile: http://k0bg.com/

Real User Reviews: http://www.eham.net/reviews/

Small Transmitting Loops: http://www.aa5tb.com/loop.html

FlDigi Software: http://www.w1hkj.com/Fldigi.html

N3FJP Logging Suite:  http://www.n3fjp.com/

EZ-NEC: http://www.eznec.com/

4NEC2: http://www.qsl.net/4nec2/


8574713 Last modified: 2018-01-11 21:47:58, 6168 bytes

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