1.2 KW LDMOS BLF188XR 1.8 - 54MHz power amplifier (tested) - $515 - (Uniontown, PA)

1.2 KW LDMOS BLF188XR 1.8 - 54MHz power amplifier (tested)1.2 KW LDMOS BLF188XR 1.8 - 54MHz power amplifier assembly with 5 by 5 inch copper heat spreader plate (1/8 inch thick). The BLF188XR is rated at 1400 watts RF output. Tested at 14.200 MHz (and at every other amateur radio band in the 3 to 30 MHz range): 4 watts in for 1000 watts out (conservative, see test video below)I recommend not exceeding 5 watts RF input power.Input circuit includes a 4 dB attenuator to achieve a 50-ohm input impedance. This is a youtube video of an identical unit being tested after installation in a complete 1.8 to 54 MHz HF amplifier: https://www.youtube.com/watch?v=kA-DzsBUpxo , which shows my output power number is conservative.They are more adventurous than I and use a +53.5 VDC drain supply voltage, rather than +50 VDC, resulting in a higher RF output power. The higher drain supply voltage raises the device's output impedance slightly with a resulting increase in RF output power. Drain supply voltage +50 VDC. Bias supply voltage +13.6 VDC Drain quiescent (idle) current set at 1 amp. 50 ohm (unbalanced) input and output impedance. Drain supply current at full power is 30 amps (nominal), 35 amps (max). This assembly includes a temperature regulated bias circuit and on-board ESD protection.For use as an amateur radio amplifier, you must add a band-switched LPF assembly. Other than that no tuning is required when changing frequency. This assembly should be mounted on a finned aluminum heat sink with forced air cooling, or other means of cooling, to maintain a temperature of less than 100 degrees C (212 F). Coming soon, a complete, finished, cost-competitive 1.8 to 54 MHz amateur radio amplifier using this 1.2 KW LDMOS BLF188XR 1.8 - 54MHz power amplifier assembly.

Posted in Uniontown, PA, Electronics
From ebay.com - 1 month ago