300W HF / 50 MHz VRF2933 / SD2933 power amplifier board with LPF and high speed protection triggers without transistors. Whatever you have, a QRP transceiver with only 5 to 10 Watts output or popular SunSDR2 - this is a choise for you to boost your signal. This single board HF/50MHz power amplifier contains all necessary modules for safe operation. 300W output power amplifier on 2 x MOSFET transistors (SD2933 or VRF2933).
7-band low pass filter to cover all HF amateur radio bands as well as 50MHs. Three level high speed protection : high SWR in antenna feeder, wrong or no LPF selected, output power overshoot and drain current excess.The power amplifier has a place for ATT on input, so different drive levels can be accepted, starting from about 3W (without ATT) up to 20W with 8dB attenuation. Amplifier performance: see pictures made with RIGOL.
If power is limited by 200W , the IMD3 is getting close to -40 dBc. LPF is 5-order Chebyshev, 7 pcs: 160 meters, 80 meters, 40 meters, 30/20 meters, 17/15 meters, 12/10 meters and 6 meters. High quality C0G/NPO capacitors by AVX and Johanson are used along with T68 Micrometals cores. SWR on LPF input is better than 1.2:1. Protection system is based on fast intelligent DC switch BTS50085.
It disconnects the drain voltage power supply in case of emergency: high SWR on PA or LPF output, max power and drain current excess. Add LCD power / SWR meter, heatsink and KSD-55 thermo relay (heatsink temperature control) to complete the device. Frequency: 1.8 54 MHz.Size 220 x 157 mm. The item "HF/50 MHz power amplifier 300W output 1.8-54 MHz with LPF and protection VRF2933" is in sale since Monday, July 16, 2018.
This item is in the category "Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Amplifiers". The seller is "r3kbo4" and is located in Voronezh. This item can be shipped worldwide.
Output Power: 300