Parts List:
R1 = 27K
R2 = 270 ohm
R3 = 1K
Tr1,Tr2 = 22pF, trimmer cap (15-40pF)
C1,C2 = 5.6pF
C3 = 0.001uF (1nF), ceramic
C4,C5 = 0.01 (10nF), ceramic
C6 = 0.1uF (100nF), ceramic
Q1 = 2SC2498, 2SC2570, 2N5179, SK9139, or NTE10. NPN VHF/UHF transistor
L1 = 4 turns of 20SWG magnet wire, 5mm diameter. (so-called 3T+1)
L2 = 3 turns of 20SWG magnet wire, 5mm diameter.
Semiconductors: Q1 = MPF102, JFET. (2N4416, NTE451, ECG451, etc.) Q2,Q3,Q4 = 2N3904, NPN transistor Resistors: All Resistors are 5%, 1/4-watt R1 = 1 MegOhm R5 = 10K R2,R10 = 22 ohm R6,R9 = 1K R3,R11 = 2K2 R7 = 3K3 R4 = 22K R8 = 470 ohm Capacitors (rated at least 16V for a 9V supply): C1,C3 = 470pF C2,C5,C6 = 0.01uF (10nF/103) C4 = 0.001uF (1nF/104) C7,C9 = 0.1uF (100nF/102) C8 = 22uF/16V, electrolytic Miscellaneous Parts & Materials: B1 = 9-volt Alkaline battery S1 = SPST on-off switch J1 = Jack to match (your) receiver cable ANT1 = Telescoping whip antenna (screw mount), wire, brass rod (about 12") MISC = PCB materials, enclosure, battery holder, 9V battery snap, etc.
Semiconductors: Q1 = MFE201, SK3991, or NTE454. N-Channel, dual-gate MOSFET (see text) Q2 = 2SC2570, NTE10, NTE107. NPN VHF/UHF silicon transistor (see text) Note: If you use the NTE107 as a replacement, make sure to insert it correctly into the pcb. The orientation is different than as shown on the parts layout diagram. (e-c-b seen front view for NTE107). See this Data Sheet Resistors: All Resistors are 5%, 1/4-watt R1 = 1 Mega Ohm R2 = 220K R3,R6 = 100K R4 = 100 ohm R5 = 10K potentiometer, (pc mount) Capacitors: C1,C2,C5,C6 = 0.01uF, ceramic disc C3 = 100pF ceramic disc C4 = 4.7 to 10uF, 16WVDC, radial lead electrolytic Additional Parts & Materials: B1 = 9-volt alkaline battery S1,S2 = DPDT PC mount pushbutton switch J1,J2 = PC mount RCA jack ANT1 = Telescoping whip antenna (screw mount) MISC = PCB materials, enclosure, enclosure, battery holder and connector, wire, solder, etc.
