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Power amplifier 1000W SDR HERMES FM SSB CW water cooling 1.8-54 MHz from R3KR
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Admin: Transmission line output transformer on 43 material cores Circuit board is FR4 double layer, copper thickness 50 um (1.5 oz) Size 80 x 100 mm Operating frequency band 1.8 - 54 MHz Drain power supply voltage 50-55 V Current consumption 30 A max Input power - 0.5W 500 mW Output power 1000W Cables, wires for the switch - Teflon Copper tube is soldered to standard solder. The transistor is screwed through the liquid metal Coollabaratory. It's better than solder.
Admin: Smart High Current DC Switch with protection triggers for power amplifiers. The application of this DC switch is to gate the power supply current to solid-state amplifier and safely disconnect it in case of emergency. Features: • Overload protection • Current limitation • Short circuit protection • Over temperature protection • Over voltage protection • Diagnostic feedback with load current sense • Operating voltage 5 – 58 VDC • Operating current 44 A max • On-state resistance 7.2 mΩ To allow the switch to be disabled by an emergency signal, 3 protection triggers are added to board: • high VSWR protector to disconnect the amplifier from power supply if SWR rises higher than preset level 2.0:1 (may be varied by user) . Forward and reflected wave voltages from external directional coupler must be provided to determine the VSWR independent of power level. • output power excess protector to disconnect the amplifier if output power is more than preset level. Fine threshold tuning from 150 up to 1500W with one BTS660P and 150 up to 2500W with two BTS660P in parallel. • DC current excess protector to disconnect the amplifier if current consumption is more than preset level. Fine threshold tuning from 20 up to 40A with one BTS660P and 40 up to 80A with two BTS660P in parallel. Red LED shows which trigger is on. Power off and then on to reset device. The onboard current sensor provides about +1VDC at 30 Amps for external current meter. Meter impedance must be at least 10 KOhm. BTS660P has a min switch-off time as low as 30 microseconds, so fast enough to protect the amplifier in case of emergency. Two BTS660P units may be installed on PCB to provide the current up to 2500 W amplifiers without additional heatsinks.
Admin: The SWR sensor. Cable - RG142 Toroid - Micrometalls FT82-43 Schottky diode 1N5711 1.8-54 MHz Power - 100W - 3 KW Size 50x65mm x 25 mm(h)
Admin: Low pass filter 1500W 1.8-30 MHz CW, SSB does not need cooling Toroid - T130-2, T130-6 Winding wires 1.8-3.5 MHz 1.2 mm, 7-14 MHz 1,6 mm, 21-28 MHz 1.6 mm 2 wires Size 120 x 120 x 80(height) mm Weight without packaging 1 kg 3.5-30 MHz capacitors ATC 1.8 MHz capacitors NP0 3000 V Suppression the second and third harmonic more than 30 dB SWR less than 1.15
Admin: RX-TX unit This unit is intended to provide the switching of amplifier between receive and transmit modes. Input signal is PTT line from transceiver. When PTT input goes low, the relays directs the signal from transceiver to PA input and from PA output to antenna. When PTT is high (RX mode) the antenna is connected directly to transceiver. It provides the ALC voltage to control the maximum output power of transceiver and additional +15V in TX mode for different user applications. One more coax connector may be installed on PCB to provide the attenuated (low level) RF voltage for automatic band decoder, if required.
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