Month: February 2015

Working CW for people that don’t do CW

This weekend saw a cacophony of CW over the bands, as part of the ARRL DX contest. The idea is to work as many USA stations as you can. They send 5NN and their state, and you send 5NN and your power.

I thought the contest would be ideal to try out the radios in built CW keyer, so I programed it up ready to have a go. As some will know I don’t read CW, but as much is sent via machines / computers these days it will mostly decode in DM780 or you chosen data program.


One programed it was just a case of keep track of what I had worked to avoid dupes, and see what I could add to the log. I used 28, 21 and 7 Mhz and over the course of a few hrs worked 100 stations.

Its always interesting to see the propagation change over the course of the day.

usa cw map

Not too bad for a bit of wire and a couple of hundred watts….

73 Dave M0TAZ


1.8 MHz Contest

The RSGB run a number of top band contests through the year. The first is the February 1.8 MHz covering both SSB and CW.  John M0UKD and myself have taken part in these for a few years now, most notably 3 years ago in 6″ of snow, and last year getting the car bogged in the mud.

Thankfully this year was mild, and not so muddy. The contest runs from 9PM to 1AM, and using a top band dipole fed with 300 Ω feeder. The centre of the dipole was at 60 ft (18m), and with a span of 260ft (80m) you need a large back garden (or access to a large field in the country).chart

Using an Icom 7100 and 32w (the maximum for this part of the band) we managed to work 60 stations including England, Wales, Scotland, Ireland, France, Netherlands and Germany.

Dave M0TAZ

Feb 1.8 mhz

The Birth of a New Digital Mode SIM31

Read the article on how the mode invented by Nizar Ben Rejeb was developed, and the advantages it has over traditional PSK31.

The article is available to read online.

You can download a free copy of the program, and read more online at ON4NB website.

A handy guide to installation can be read here.

Ive been using it for a few days now, but its too early to test its robustness. Many digital modes come and go over the years, but its always interested to test and understand the advantages and disadvantages.  It certainly looks very much like PSK31, but the program helps identify that by a CW ident SIM and in PSK31 you will decode NEW SIM31 on your screen.

It also has an interesting “beacon mode” that can fully automate QSO. Imagine the joy of leaving that on overnight, and in the morning finding out you have worked 10 new DXCC while you have been tucked up in tog heaven dreaming of that 30 meter tower and 5E stepper IR …

Dave M0TAZ