valutazioni - 2, GPA: 4
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5-1 5-2 TRANSMITTER CIRCUITS.................................................... 5-2 5-3 PLL CIRCUITS ............................................................. 5-4 5-4 DIGITAL CIRCUITS.......................................................... 5-5 5-5 POWER SUPPLY CIRCUITS................................................... 5-5 5-6 PORT ALLOCATIONS........................................................ 5-5 SECTION 6 ADJUSTMENT PROCEDURES 6-1 PREPARATION............................................................. 6-1 6-2 FREQUENCY ADJUSTMENT.................................................. 6-4 6-3 TRANSMIT ADJUSTMENT.................................................... 6-5 6-4 RECEIVE ADJUSTMENT..................................................... 6-6 SECTION 7 PARTS LIST SECTION 8 MECHANICAL PARTS AND DISASSEMBLY SECTION 9 SEMICONDUCTOR INFORMATION SECTION 10 BOARD LAYOUTS SECTION 11 BLOCK DIAGRAM SECTION 12 VOLTAGE DIAGRAM SECTION 13 BC-160 SECTION 1 SPECIFICATIONS [USA], [GEN] [EUR] • Frequency coverage 136-174 MHz • Type of emission Wide 16K0F3E (25.0 kHz) Middle - 14K0F3E (20.0 kHz) Narrow 11K0F3E (12.5 kHz) 8K50F3E (12.5 kHz) • Number of programable channels 128 channels (8 zones) GENERAL • Antenna impedance 50 Q (nominal) • Operating temperature range -22°F to +140°F -25°C to +55°C • Power supply requirement Specified Icom’s battery packs only (Operatable voltage; 7.2 V DC negative ground) • Current drain RX Stand-by 75 mA (approx.) Max.audio 250 mA TX at 5 W 1.5 A at 1 W 0.7 A • Dimensions (projections not included) 2 3/32 (W) X 4 23/32 (H) X 1 9/32 (D) in 53.0 (W) x 120.0 (H) x 32.5 (D) mm • Weight (with BP-231, approx.) 9.2 oz 260 g • Transmit output power 5 W (High), 2 W (Low2), 1 W (Low1) • Modulation Variable reactance frequency modulation • Max. permissible deviation Wide ±5.0 kHz Middle - ±4.0 kHz Narrow ±2.5 kHz • Frequency error ±2.5 ppm ±1.5 kHz TRANSMITTER • Spurious emission 80 dB typ. 0.25 |jW (<1 GHz), 1.0 |jW (>1 GHz) • Adjacent channel power Wide More than 70 dB (80 dB typ.) Middle - More than 70 dB (80 dB typ.) Narrow More than 60 dB (70 dB typ.) • Audio harmonic distortion 3% typ. (with 1 kHz AF 40% deviation) • FM hum and noise Wide More than 40 dB (46 dB typ.) - (without CCITT filter) Narrow More than 34 dB (40 dB typ.) - • Residual modulation Wide - More than 45 dB (53 dB typ.) (with CCITT filter) Middle - More than 43 dB (51 dB typ.) Narrow - More than 40 dB (48 dB typ.) • Limiting charact of modulation 60-100% of max. deviation • Microphone impedance 2.2 kO • Receive system Double-conversion superheterodyne • Intermediate frequencies 1st IF; 46.35 MHz, 2nd IF; 450 kHz • Sensitivity 0.25 |jV typ. at 12 dB SINAD -4 dB|jV (EMF) typ. at 20 dB SINAD RECEIVER • Squelch sensitivity (at threshold) 0.25 p,V typ. -4 dB|jV (EMF) typ. • Adjacent channel Wide More than 70 dB (75 dB typ.) selectivity Middle - More than 70 dB (75 dB typ.) Narrow More than 60 dB (65 dB typ.) • Spurious response More than 70 dB • Intermodulation More than 70 dB (75 dB typ.) More than 65 dB (67 dB typ.) • Audio output power 0.5 W typ. at 5% distortion with an 8 Q load • Audio output impedance 8 Q Measurements made in accordance with EIA-152-C/204D, TIA-603 ([USA], [GEN]) or EN 300 086 ([EUR]). All stated specifications are subject to change without notice or obligation. 1 - 1 SECTION 2 INSIDE VIEWS MAIN UNIT TOP VIEW BOTTOM VIEW AF amplifier (IC15: TA7368FG) IF amplifier (Q7: 2SC5107) PLL IC (IC2: MB15A02PFV1) IF IC (IC9: TA31136FNG) LCD driver (IC20: LC75834W) CPU5 regulator (IC17: NJM2870) 1st mixer (Q6: 3SK324) R5 regulator (Q25: 2SA1577) Ceramic filter 450 KHz (FI2: CFWM450F) S5 regulator (Q23: 2SA1577) T5 regulator Q24: 2SA1577 Q49: UNR9213J Analog switch IC3: CD4066BPWR +5 regulator Q26: 2SB1132 Q27: XP6501 Q28: UNR9213J TX VCO Q16: 2SC5006 D10,D13,D34: HVC375B RX VCO Q17: 2SC5006 D9,D11,D33: HVC375B VCO circuits Crystal oscillator ï 15.3 MHz (X2: CR-783) D/A converter (IC12: M62364FP) Reset IC (IC8: BD5242G) EEPROM (IC10: HN58X2464TI) CPU (IC22: HD64F2238BTF13V) PA UNIT TOP VIEW BOTTOM VIEW Antenna switch (D701: 1SV307) Pre-drive amplifier (Q704: 2SC5006) Antenna switches D704:1SV307 D706:1SV307 Power amplifier (Q701: RD07MVS1) APC amplifier (IC701: TA75S01F) Drive amplifier (Q702: RD01MUS1 2 - 1 SECTION 3 DISASSEMBLY INSTRUCTIONS 1 REMOVING THE CHASSIS UNIT © Unscrew ANT nut ®, and remove knob @. © Unscrew 2 screws ©, and remove the jack panel. © Unscrew 2 screws @, and unplug the connector © from the chassis unit. © Take off the chassis unit in the direction of the arrow from the front panel. 2 REMOVING THE MAIN UNIT © Remove the main seal ©. © Unscrew VR nut ©, and remove the top plate ©. © Unscrew 6 screws ®. © Remove the side plate ®. © U...
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