Ramsey Electronics FR6 Instruction Manual

Also see for FR6: User manual

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Ramsey Electronics FR6 Instruction Manual Manual pdf 6 page image

FR6 • 6practical level for speaker or headphone operation. Pin 16 of U2 will groundthe input of U3 when the squelch is closed.L4, a 450 KHz IF coil, permits adjustment of the 90-degree voltage-currentphasing ("quadrature") of FL2's output to the FM detector demodulator (pin 8of the MC3359).PARTS LISTInductors 2 .15 uH inductors [looks like a resistor with brown-green-silverbands] (L1,L2) 1 slug-tuned turn coil [blue color] (L3) 1 shielded transformer coil [marked LB 53303] (L4)Semiconductors and IC's 1 2SC2498 or 2SC2570A transistor (Q1) 3 2N3904 transistor (Q2,Q3,Q4) 1 SA602 8-pin IC (U1) 1 MC3359 18-pin FM receiver IC (U2) 1 LM386 8-pin audio amplifier IC (U3) 1 Varactor diode, BB505 [orange body marked BB505] (D1) 1 1N4148 signal diode (D2)Special Components 1 10.24 MHz Crystal (Y1) 1 10.7 MHz ceramic filter [brown, molded, 3 leads] (FL1) 1 450 KHz ceramic filter [black, square] (FL2)Fixed Resistors 1 2 ohm [red-black-gold] (R22) 3 270 ohm [red-violet-brown] (R6,9,20) 1 470 ohm [yellow-violet-brown] (R5) 2 1K ohm [brown-black-red] (R11,12) 3 10K ohm [brown-black-orange] (R7,17,19) 1 18K ohm [brown-gray-orange] (R18) 1 33K ohm [orange-orange-orange] (R14) 4 47K ohm [yellow-violet-orange] (R4,8,13,21) 1 100K ohm [brown-black-yellow] (R16) 1 470K ohm [yellow-violet-yellow] (R15) 1 1 megohm [brown-black-green] (R10)Capacitors 1 4.7 or 5 pF (C2) 2 10 pF (C1,5) 1 22 pF (C19)