Homebrew amplifier6/9/2023 There was no documentation, but there are many articles available on the internet. I ordered one of these kits and it arrived several weeks later. There is a 100W version which uses a purpose designed dual RF transistor MRF9120 – I built this also for comparison. They are not optimized for RF with a quite a significant input capacitance which has to be “swamped” with resistance for broadband use.īut they are cheap at $1-2 ea and a useful amplifier can be made with these. The 70W version uses two IRF530 MOSFETs designed for power switching applications. It uses a broadband balanced push-pull configuration with bias, PTT and changeover relay circuits. For $US35 or so for the kit this seems excellent value. These claim an SSB power output of 70-100W over the HF bands using cheap MOSFET switching transistors such as the IRF 530. A full featured 100W amplifier will set you back anything up to US$1000.īut there are cheap kits sold on eBay and from Chinese suppliers such as AliBaba. These are suitable for low power data modes or CW but struggle on SSB – many operators are looking for a step up with a linear amplifier. QRP for HF is now popular – rigs such as the Yaesu FT818 or low power SDR transceivers are readily available. The MiniPA Linear amplifier for HF – in practice
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