This RF FM Amplifier is always essential for the amateur that wants it strengthens some small transmitter. The present circuit of BLY90 can give 50-60W power out with input control 15-20W in FM band II 88-108 MHz.FM amplifier schematic Circuit
Printed Circuit Board
FM Amplifier Parts List
C1-C4 = 10-80pF
C5 = 10nF
C6 = 1000pF
C7 = 100nF
C8 = 2200mF/35V
TR1 = BLY90
L1 = 1 Turn of diameter of 10mms, 1mm
L2 = 7 Turns of diameter of 10mms, 0,8mms
L3 = 3 Turns of diameter of 10mms, 1mm
Source: 50W FM Amplifier BLY90
50W Linear FM Amplifier with BLY90
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The headline is confusing....
Without a bias source connected to the base of BLY90 this transistor runs in Class C and then it is not linear.
For FM or CW class C is OK.