ANNOUNCEMENT!!! Due to component variations we have noticed that on Rev F and Rev G amp boards, the power dissipation on 20 meters is quite high; ~135W for Rev F and ~150W for Rev G. In the case of Rev G boards, extended operation on 20M can cause relay failure due to excessive heat. We have made adjustments in the V3.0D firmware that adjusts the internal configuration of the amp to reduce the dissipation on 20M to less than 120W. If you have a Rev G amp please update the firmware to V3.0D Instructions for installing new firmware can be found in the operating manual or online here.    Welcome to the Hardrock-50 power amplifier site! The Hardrock-50 is a complete 5W in, 50W out power amplifier kit. The HR50 is FCC Type Approved for commercial sale and can be purchased at HobbyPCB.com. The HR50 uses 4 Mitsubishi RF16HHF1 power MOSFETs and microprocessor controlled for easy reliable operation. The amplifier is based on Jim Veatch's award winning design developed for the ARRL's 2nd Homebrew Challenge competition and was tested extensively by the ARRL labs for output power, linearity and durability. More than 200 kits have been sold and builders receive excellent support and resources the successfully complete the kit. The HR50 interfaces with popular QRP transceivers like the Elecraft KX3, Yaesu FT-817 and Flexradio Flex-1500 to provide additional power when necessary or to act as an intermediate amplifier for driving even higher power amps. The HR50 can be fitted with a 0.5W input 5W output driver amplifier that fits inside the case and integrates seamlessly with HR50's operation allowing it to work with low power SDR kits like the Softrock, Peaberry SDR and others. For CW operators a QSK board is available that replaces the electromechanical relay with fast, silent PIN diode switching. Have a look at the reviews on Eham.net (opens in a new window).
NEWS: The Toroid Guy now offers pre-wound toroid kits for the Hardrock-50 For $35 you can get a complete set of prewound toroids for the Hardrock-50. It includes L6 thru L15, the next time I have to build one of these, I'm ordering a set! Ordering infor is on the Toroid Kit page. Thanks to Mychael for providing this excellent service for us. Serial Number: 1151 Date: 11 Oct 2013
The measurements are taken at 50W out or 5W drive if 50W cannot be achieved. Serial Number: 1140 Date: 24 September 2013
The measurements are taken at 50W out or 5W drive if 50W cannot be achieved. |