HF power amplifier 1000W VRF2933 (in frame)
1000W HF MOSFET power amplifier.
Operation frequencies 1.8 – 30 MHz
Operation modes SSB, CW
Input power 29 – 37 W
Output power 1000 W
Power supply 13.8VDC, 50VDC
Drain current max 26 – 29 A
IMD3 (@14 MHz, 800W) - 31 dBc
Size 310 x 235 x 160 mm
Weight 6.2 kG
This amplifier use 4 x VRF2933 modern MOSFET transistors. It is equipped with all protections required for safe operation:
max input power,
max output power,
max drain current,
SWR on output higher than 2.0:1.
It has two levels of air cooling fan speed: normal and forced. Forced mode is engaged when copper heat spreader plate temperature rise above 50*C. If temperature rise above 80*C the PTT line is being disabled. Both thermo sensors has 10*C hysteresis.
Two lines LCD shows the output power in Watts and SWR on output. Second line is output power bar graf.
Protection status LEDs are placed on boards, but could be transferred to the front panel.
Rear side has 2 coaxial connectors (input and antenna) and 25-pin control. The control connector is used to select the LPF bands and has +13.8V, ALC and PTT inputs also.
The amplifier is assembled on aluminum frame, easy to place inside the box of suitable size.
The manufacturing time is 2-2,5 weeks.