Author Archives: Jerzy

AMS installed at home

Today electrician installed an AMS power consumption meter at my home. Automatic measurement systems (AMS) is a technology that measures power consumption on an hourly basis and automatically sends information about the power consumption of the network company. The meter continuously record the amount of electricity used. This registration is collected and transmitted via radio to the […]

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Unexpected tropo to G/GM

This morning, unexpected found tropo path to G/GM. Did 7 QSO¬īs 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 ! ¬†ūüôĀ 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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