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Welcome to the Home Page of KO4LZ!

Welcome to my amateur radio homepage! A little bit about me and my station:


After many years as a SWL, I began amateur radio as a Technician class licensee (KD4ENH) in the early 1990s, upgraded shortly thereafter to Advanced class (KO4LZ) and now hold an Extra class license. Propagation permitting, I operate regularly on HF (mostly CW) and hold DXCC, WAS, and VUCC.

Professionally, I work as an Applications Engineer at Rohde and Schwarz covering RF test and measurement equipment. Some of my specialties include interference hunting, direction finding, EMC, and amplifiers, so amateur radio is a nice complement to my "day job." You can find links to many of my presentations, whitepapers, and webinars at my personal website.


My station setup is very modest : I use an ICOM 718 as my primary radio with a Rigblaster Advantage for digital work and an LDG AT-200Pro II autotuner.

For a variety of reasons, I use indoor antennas for all of my HF activity. Before 2005, I was using a 7 meter end-fed random wire in the attic, tuned with an Icom AH-4.

The wire was (allegedly) "balanced" by using a similar piece of wire as a counterpoise. Due to a number of RFI issues and lackluster performance, I eventually decided to move to a real dipole which I connected to an Icom AH-4 tuner via ladder line.

The dipole itself was made of 33 feet of regular antenna wire (about the length of my attic), which happily corresponds to the 20m PSK frequency (14.070 MHz). The dipole was connected to the ladder line via a ladder lock connector. If you had an HF QSO with me between 2005 and 2016, this is the antenna I was using.

Note that Icom officially disavows connecting the AH-4 this way (splitting the ladder line and attaching the two conductors to the top and bottom of the AH-4), but it does work. A feedline choke and a short, straight run of ladder line are however highly recommended.

In late 2015 I finally replaced this arrangement with a "proper" homemade dipole (1:1 balun) fed with coax and tuned with the LDG autotuner. The dipole is cut for 20 meters, but with the tuner I can work everything from 40 to 10 meters with reasonably good results and (manageable) RFI issues. All of my (non-portable) HF QSOs since December 2015 were made using this antenna.


I enjoy sending and receiving paper QSLs and will gladly QSL any and all contacts. For paper QSLs, please QSL direct or via the bureau. I automatically upload all of my contacts to LoTW and QRZ, and will also QSL via eQSL on request.

 Paul Denisowski's home page


8419055 Last modified: 2017-10-30 00:41:53, 5119 bytes

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DX World Award#5042
Granted: 2017-02-01 12:02:02   (KO4LZ)

United States Counties Award#1353
Granted: 2016-07-19 20:00:05   (KO4LZ)

  • 100 Counties Digital
  • 100 Counties Mixed
  • 250 Counties Mixed
United States Award#2221
Granted: 2016-06-03 18:45:02   (KO4LZ)

World Continents Award#13801
Granted: 2016-05-28 22:35:02   (KO4LZ)

  • 20 Meters Mixed
Grid Squared Award#10942
Granted: 2016-03-13 23:10:02   (KO4LZ)

  • 20 Meters Mixed
  • 6 Meters Mixed
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