OK1RR DX & Contesting Page

Ham Radio web site dedicated to CW DX operating and contesting
1 turn

How to sort unknown ferrite cores

Do a single loop through the core windows and measure the impedance with some sort of analyzer. Even an MFJ259B with a short connection to the jack will work well for this. If X=R someplace much higher, you can be sure it is a different mix. The Q=1 frequency, where X=R or where loss tangent

TR4W is now Open Source

  2015-05-19   The TR4W support group is pleased to announce that TR4W is now Open Source’d on GitHub and licensed under GPL V3. TR4W (TRlog 4 Windows) is an amalgam of base TRLOG code (TR4W/SRC/TRDOS) -originally authored and Copyrighted by N6TR, with a Windows application layer (TR4W/SRC) -originally authored and Copyrighted by UA4WLI. TR4W

A Soundcard Digimode Interface

Many years ago I wanted to test RTTY and the new digital modes. Not too seriously, with a simple interface in KISS (Keep It Simple Stupid) style. There is nothing to improve, except my awful PCB design matched to the box I discovered in my junk store. For AF isolation I used small transformers made
A single turn through the core

Yet another transformer for Flags and Pennants

Many Flag and Pennant users recommending a very straightforward design – Amidon BN73-202 binocular core with 3 turns for a primary and 12 turns for a secondary winding. Wind the transformer with the low impedance winding first, and put the high impedance over it. For the primary, a plastic coated wire can be used, the

WAS, DXCC 60m program

Recently I did an article concerning the 60m WAS program, and now I will try to give a brief, concise discussion as it relates to DX chasing on our 60m channels. The subject is extremely complicated, and one would have to be a DXer from day one in July 2003 to appreciate the difficult nature of working DX and chasing DXCC countries on the band. Those new DXers trying out the 60m channels need to read the history of 60m and become informed on what etiquette has developed over the years, especially with respect to getting along with ragchewers and being more gentlemanly in our efforts to work DX on 60m and not become deliberate QRMers. We all know how much that has destroyed DXing these past few years.

Arm strap in action

Drop-Proof Antenna Analyzer

While working on antennas some people have a bad experience with the antena analyzer dropping from the tower etc. An useful solution would be to attach some kind of lanyard (cord, line) and then have the loop end over your head. That way, if this unit were to slip out of a pocket it would just hang at the end of the lanyard. I was also afraid of dropping the unit, or putting strain on the antenna connector of my SARK-110. Here is the solution.

Everything Works

a reprint of the revolutionary article by Thomas H. Schiller, N6BT (QST July, 2000)

"N6 Bravo Tango, this is N0 Papa Golf. Tony, Iowa, number 69591." I made it with one call: February 5th, 2000, my first contact with "The Illuminator." KB9TQI, Indiana; N0IJ, Minnesota; K4CIH, Alabama; WA9TPQ, Illinois; N5MT, Texas; KB0MZG, Kansas; and, KX9DX, Illinois were other contacts made in the 10/10 Contest, slipping into the radio room from time to time while working in the yard. The path to Indiana was the farthest on record for me with the 150-W light bulb perched on a fence post. What a pleasant surprise, and there was more to come.


A common modern practice is to use THX or THNX abbreviations as an expression of thanks. These two „new form“ abbreviations came from internet but our new radio brethren transferred them onto radio waves. It is unchangeable sign that the user of such junky abbreviations is a NO-CODER. A thinking skilled ham can easily compare

Facebook Says OK to Ham Calls As Alternate Name

Officially licensed amateur radio operators may now use their call sign as their alternate name, or nickname, on their individual Facebook profiles. This thanks to Richard Bobbitt, NW7OR, who recently organized a petition drive on the social media site in the hope of achieving this goal. It turned out that Jeff Ferland, KB1PNB, who works

Fake FTDI chips

It was only a matter of time before fake FTDI RS232-USB adapter chips began to appear. http://zeptobars.ru/en/read/FTDI-FT232RL-real-vs-fake-supereal This fascinating page shows how some anonymous Chinese company has created a fake FT232RL chip using a mask-programmable microcontroller, and printed it with the “FTDI” name and logo. Like Prolific (the real Prolific company, that is) FTDI have