Hi, welcome to my blog !

My name is Jerzy and thanks for dropping in. I am very glad you are surfing around here so I would like to take this opportunity and present myself. I have been a radio amateur since 1969. My first SWL signature was SP8-1871 and a short time after I got SP8DXL. After 1976 I used SP2DXL and since 1988 I am LA4YGA. From 2004 I am also as SP4DXL when visited Poland. My QTH is Kristiansand, in the south part of Norway, WW locator is JO48be. My favorite subjects in HAM radio are VHF/UHF propagation and construction of RF equipment.

Standings

Standings

Worked DXCC entities and squares

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Unexpected tropo to G/GM

This morning, unexpected found tropo path to G/GM. Did 7 QSO´s and best QRB was 1128 km with G4RRA. Signals were stronger from GM direction, as predicted by F5LEN forecast.   Tropospheric propagation forecast by courtesy of F5LEN  

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Modification WCDMA 2170MHz to 13cm

For original description of the modification go to IZ4BEH . The page is in Italian but using Google Translator is easy to understand main ideas and way to go. I found it very easy to do. One should be, of course,  very carefully not to damage components around the modified places. With 28V supply it is […]

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WSPR Power Amp

Finally finished a power amplifier for Ultimate3S. The idea I had found on net, see page VK3PE . I contacted Glen and he gave me needed GERBER files to order PCB. Used  Seeedstudio.com and got 5 pcs very quickly. Had some problems to complete components, see my story about fake RD166HHF1 devices. Finally ampilfier is ready and working. I […]

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Beware fake semiconductors

I bought a pack of 5 x RD16HHF1 HF power mosfets via eBay from good-module based in China and ended up with a problem, devices were supplied but they weren’t RD16HHF1’s !  🙁 I fitted one device on the amp PCB and applied power. The power supply went into overcurrent shutdown straight away! Measurements indicated that […]

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ICOM IC-7100 ALC modification

After updating soft to Release E5 for sometimes ago I decided to do hardware modification as well. For instruction and explanation I recommend go to TRX Bench on YouTube – https://www.youtube.com/watch?v=YaGy4pUxkHc . The rig after modification is working excellent and issue with low power is solved.

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