Category Archives: Equipment

2024 Tokyo Ham Fair

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In addition to the large amateur radio fairs in Friedrichshafen / Germany and Dayton / USA, the Tokyo Ham Fair in Japan is by far the largest of these exhibitions. In 2024, it recorded a new record with around 45,000 visitors.
I had long planned to travel to Japan and visit the Ham Fair. This year, it finally worked out. The new exhibition hall “ARIAKE GYM-EX” is located directly on the Pacific and is convenient and easy to reach by public transport.

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The following pictures give a small impression of this great exhibition.


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It was a great pleasure for me to meet many well-known DX’ers ​​in person and to make new friends.
See you in Tokyo or see you again on one of the amateur radio bands.

2m SSPA – Part 1

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After my previous homemade 2m Pa with 2x 4CX250B (build around 1975) is getting old, it was time to think about a new “state of the art” amplifier. Transistorized, high power, a low noise blower and all at an affordable price – that would be nice.

In an article of F1JRD, published in Dubus magazine 4/2010, I found the description of a compact (PCB 12 x 7 cm) 2m power amplifier with a Freescale LDMOS transistor. The tremendous gain of about 27 dB, more than 1.000 watts output power, combined with a relatively little effort, was fascinating.

After a longer search in the Internet I decided to build this project and started to assemble the main components. I ordered a BLF578 transistor at ebay, components from France and the copper heatsink from the Netherlands.
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