Our Club has started a journey to more power, how to lite up a FT817 HD. 300 watts NEC UHF was the average from these boards with minimal input drive. Its off to the paint shop, then too the wiring up specialist VK4AMG.
VK4NE has started the mock up of the first 70cm NEC 300-400 watt Amplifiers. as above.
A second 70 cm NEC-UHF Amplifier has been started and the inside has been juggled to fit its second hand box. These pictures show some of the setup and workings to get the results 300 plus watts for this one. These Amplifiers have SWR/Oner power protection as pictures show.
There is a third 70cm NEC-UHF Amplifier which CRO is building will post progress as it happens.
Lastly is the Club 70cm NEC-UHF Board these pictures show more of the workings and front panel 150 watts is aceived with 5 watts drive from the used radio. VK4AMG has made this project easier with the help of his expertise.
Club NEC SSPA is finished. 150W for 5W drive. Only has 16.5A power supply, that’s all it can do even if driven harder.
Pin trip is set for 15W; SWR for 2.5:1; temp 60 deg C.
The power supply was 50V so I supplied a 28V one.
A laminated instruction sheet to stick on the top to explain
its operation in particular the uP controller.
