MOSFET VRF2933
HF-MOSFET
After the topic of power supply was clarified, I searched for the best RF transistor for this project. It should be robust and affordable. I discovered the SD2933 from ST which is still available but no longer produced. More interesting seemed to me the VRF2933 from Microsemi.
| VRF2933 | SD2933 | |
| Drain Source Voltage | 170 V | 125 V |
| Drain Current | 42 A | 40A |
| Gain | 22 dB | 20 dB |
| Power | 300 W | 300 W |
| VSWR all Phases | 70:1 | 3:1 |
That looked already good, to get the VRF2933 unintentionally
broken seemed almost impossible and also Dick Frey, developer
at Microsemi, does not manage it in a really breathtaking
video. Who also raises the voltage to 65VDC to get a whopping
600W out of a MOSFET and then pulls sparks with a screwdriver
at the output at 1200W!
Note, however, that this was a pulsed signal and not CW.