300 W output HF / 50 MHz amplifier SSB/CW for SDR ANAN-10, FLEX-1500 etc. This device is designed for use with SDR radios , like ANAN-10, FLEX-1500 or others.
With 6 to 8 W input power from SDR it delivers 300W output to your antenna. The amplifier\'s output is filtered by LPF with diplexer, so the second and higher harmonics of transmitted signal are suppressed for more than -47 dBc. To switch the filters you need simple open-collector circuit in SDR or external mechanical switch. This amplifier may be used with QRP transceivers like FT-817 or IC-703 (with automatic band decoder) also.
Active elements are matched pair of VRF2933 MOSFET transistors (see schematic) in AB-class. 2-tone measured IMD3 is -40 dBc. New version has transmission line type output transformer for better perfomance.
Measured by KC901H network analyser suppression of second and third harmonics (amplifier with diplexer) is:
10 meters 2nd -52 dB 3rd -55 dB
20 meters 2nd -54 dB 3rd -47 dB
80 meters 2nd -53 dB 3rd -51 dB.The power supply requirements is 50V 10 - 12A.Input power 6-8W
Output power on 1.8-30 MHz is 300W
If comes with BPF ( item number 191722100589) this device will be controlled by HERMES-based SDR completely: RX/TX switching, band changing and SWR protection becomes automaticthrough user programmable pins of accessory connector. To protect and control this amplifier the special device is recommended to use, see item171927308343.Board size 190 x 165 mm.
This device does not include heatsink. Add $40 for ready-to-use aluminium 3000 square cm heatsink and $35 for separate box shipping. More tech info at .
