Icom IC-746PRO Service Manual

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Icom IC-746PRO Service Manual Manual pdf 4 page image

SECTION 1 SPECIFICATIONS1 - 1 GENERAL• Frequency coverage:Receive 0.030– 60.000 MHz*1, *2108.000–174.000 MHz*1, *2Transmit 1.800– 1.999 MHz*2 3.500– 3.999 MHz* 27.000– 7.300 MHz*2 10.100–10.150 MHz*214.000– 14.350 MHz*2 18.068–18.168 MHz*221.000– 21.450 MHz*2 24.890–24.990 MHz*228.000– 29.700 MHz*2 50.000–54.000 MHz*2144.000–148.000 MHz*2*1 Except for some frequency ranges.* 2 Depending on version.• Mode : USB, LSB, CW, RTTY, AM, FM• Number of memory channels:101 (99 regular, 1 call, 2 scan edges)• Antenna connector : SO-239 ✕ 3 (2 for HF/50 MHz bandsand 1 for 144 MHz band; 50 Ω)• Usable temp. range: –10˚C to +60˚C (14˚F to 140˚F)• Frequency stability : Less than ±7 ppm from 1 min. to 60min. after power ON. After that therate of stability change is less than ±1ppm at 25˚C (+77˚F). Temperaturefluctuations (0˚C to +50˚C; 32˚F to122˚F) less than ±5 ppm.• Freq. resolution : 1 Hz• Power supply requirement:13.8 V DC ±15 % (negative ground)• Current consumption:Transmit max. power 23.0 AReceive stand-by 2.2 Amax. audio 3.0 A• Dimensions : 287(W) ✕ 120(H) ✕ 316.5(D) mm11 5⁄16 (W) ✕ 423⁄32 (H) ✕ 12 15⁄32 (D) in• Weight : 9.0 kg (19 lb 13 oz)• ACC 1 connector : 8-pin DIN connector• ACC 2 connector : 7-pin DIN connector• REMOTE connector : 2-conductor 3.5(d) mm ( 1⁄8") TRANSMITTER• Output power : SSB/CW/RTTY/FM 5–100 WAM 5–40 W• Modulation system :SSB PSN modulationAM Low power modulationFM Phase modulation• Spurious emission : Less than –50 dB (HF bands)Less than –60 dB (50/144 MHz bands)• Carrier suppression: More than 40 dB• Unwanted sideband suppression:More than 55 dB• ∆TX variable range : ±9.99 kHz• Mic. connector : 8-pin connector (600 Ω)• ELE-KEY connector : 3-conductor 6.35(d) mm ( 1⁄4")• KEY connector : 3-conductor 6.35(d) mm (1⁄4")• SEND connector : Phono (RCA)• ALC connector : Phono (RCA) RECEIVER• Receive system : Triple-conversion superheterodyne• Intermediate frequencies:1st IF freq. 64.455 MHz2nd IF freq. 455 kHz3rd IF freq. 36 kHz• Sensitivity (typical) :SSB, CW, RTTY (10 dB S/N)1.8–29.99000 MHz* 1 0.16 μV50.0–54.0000 MHz*2 0.13 μV144.0–148.0000 MHz*3 0.11 μVAM (10 dB S/N)0.5–1.799999 MHz 13 μV1.8–29.99000 MHz*1 2.0 μV50.0–54.0000 MHz*2 1.0 μV144.0–148.0000 MHz*3 1.0 μVFM (12 dB SINAD)28.0–29.9900 MHz*1 0.5 μV50.0–54.0000 MHz*2 0.25 μV144.0–148.0000 MHz*3 0.18 μV*1 Pre-amp 1 ON * 2 Pre-amp 2 ON *3 Pre-amp ON• Squelch sensitivity (Pre-amp OFF):SSB/CW/RTTY Less than 5.6 μVFM Less than 1.0 μV• Selectivity (typical) :SSB (at 2.4 kHz bandwidth)More than 2.4 kHz/–6 dBLess than 3.2 kHz/–40 dBLess than 3.6 kHz/–60 dBLess than 4.3 kHz/–80 dBCW (at 500 Hz bandwidth)More than 500 Hz/–6 dBLess than 700 Hz/–60 dBRTTY (at 350 Hz bandwidth)More than 360 Hz/–6 dBLess than 650 Hz/–60 dBAM (at 6 kHz bandwidth)More than 6.0 kHz/–6 dBLess than 15.0 kHz/–60 dBFM (at 15 kHz bandwidth)More than 12 kHz/–6 dBLess than 20 kHz/–60 dB• Spurious and image rejection ratio:More than 70 dB (HF/50 MHz band)(except IF through in 50 MHz band)More than 60 dB (144 MHz band)• RIT variable range : ±9.99 kHz• Audio output power (at 13.8 V):More than 2.0 W at 10 % distortionwith an 8 Ω load• PHONES connector: 3-conductor 6.35 (d) mm (1⁄4")• EXT SP connector : 2-conductor 3.5 (d) mm (1⁄8") 8 ΩAll stated specifications are subject to change without notice or obligation.

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