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Output amplifier is built as two level - BRF91(90) + MAW11. On input there is combination R/C (470 Ohm + condenser) to adjust narrow frequency range. Condenser is set experimentally after mechanical completion of the device. 1 MHz and 80 MHz frequencies are used as measuring points. Schematics:
PCB is double sided with dimensions 30 x 45 mm:
Components placement:
Photo from the time of tuning:
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