This is the 40Mhz RF amplifier circuit. The sensitivity of a receiver may be significantly increased if this circuit is inserted between the receiver and the antenna. The amplifier circuit does not use resonant circuits and is suitable for both medium and for the short waves, up to 40 MHz.
The gain of this RF amplifier is 20db and it consumes 7mA electric current, when it is supplied with 12 until 15V dc. The input and the output should be connected with coaxial cable, resistance 75ohm.
Parts List:
| R1 = 75ohm
R2 = 10Kohm R3-7 = 5.6Kohm R4-5 = 4.7Kohm R6 = 820ohm R8 = 470ohm R9 = 2.2Kohm R10 = 68ohm | C1-3 = 47nF/100V
C2-4 = 10nF/100V C5-6 = 47nF/100V Q1-2-3 = AF125 J1-2 = Jack BNC |
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