The age of the SDR Txcvr

ZL1AXG
On 19 April 2017 Bernard ZL2BD and Frank ZL2TTS gave us a talk about and subsequently demonstrated this game changing SDR Txcvr from Icom!

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Shed Workshop 4 July - High Current Switch Mode PS and Mixers in the Simple TXCVR

Our July shed workshop was held on 4 July 2021 from 1pm to 3pm at the QTH of Mike ZL1AXG (2 Derry Hill, Churton Park, Wellington). Mike ZL1AXG is building Charlie Morris ZL2CTM's Simple SSB Transceiver. This is a modular design and as each module is completed it is tested. In this second session Mike discussed design and construction features and demonstrated the testing of completed modules. The module in the picture is one of two double balanced mixers constructed from scratch on veroboard (Photo from Charlie ZL2CTM) Bernard ZL2BD also presented on high current Switched Mode Power Supplies suitable for driving Kilowatt amplifiers. He designed a system using two SMPS at 24 v to power a 2Kw linear for another amateur. The SMPS turned out to be very quiet electrically and they are available in 12v and 13.8v and other voltages as well ex China at very reasonable prices. Tea and coffee were available following the workshop.