Ramsey Electronics FR6 Manuel d'utilisateur télécharger pdf (Page 6)

FR6 • 6

practical level for speaker or headphone operation. Pin 16 of U2 will ground

the input of U3 when the squelch is closed.

L4, a 450 KHz IF coil, permits adjustment of the 90-degree voltage-current

phasing ("quadrature") of FL2's output to the FM detector demodulator (pin 8

of the MC3359).

PARTS LIST

Inductors

 2 .15 uH inductors [looks like a resistor with brown-green-silver

bands] (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)

1 2 3 4 5 6 7 8 9 10 11 ... 23 24

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Ramsey Electronics FR6 Manuel d'utilisateur Page 6