Icom IC-746PRO, Service Manual

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SECTION 1 SPECIFICATIONS
1 - 1
■
GENERAL
• Frequency coverage:
Receive 0.030– 60.000 MHz* 1, * 2
108.000–174.000 MHz* 1, * 2
Transmit 1.800– 1.999 MHz* 2 3.500– 3.999 MHz* 2
7.000– 7.300 MHz* 2 10.100–10.150 MHz* 2
14.000– 14.350 MHz* 2 18.068–18.168 MHz* 2
21.000– 21.450 MHz*
2
24.890–24.990 MHz*
2
28.000– 29.700 MHz* 2 50.000–54.000 MHz* 2
144.000–148.000 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 bands
and 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 60
min. after power ON. After that the
rate of stability change is less than ±1
ppm at 25˚C (+77˚F). Temperature
fluctuations (0˚C to +50˚C; 32˚F to
122˚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 A
Receive stand-by 2.2 A
max. audio 3.0 A
• Dimensions : 287(W)
✕
120(H)
✕
316.5(D) mm
11 5 ⁄
16
(W)
✕
4 23 ⁄
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 W
AM 5–40 W
• Modulation system :
SSB PSN modulation
AM Low power modulation
FM 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 MHz
2nd IF freq. 455 kHz
3rd IF freq. 36 kHz
• Sensitivity (typical) :
SSB, CW, RTTY (10 dB S/N)
1.8–29.99000 MHz* 1 0.16 µV
50.0–54.0000 MHz* 2 0.13 µV
144.0–148.0000 MHz* 3 0.11 µV
AM (10 dB S/N)
0.5–1.799999 MHz 13 µV
1.8–29.99000 MHz* 1 2.0 µV
50.0–54.0000 MHz* 2 1.0 µV
144.0–148.0000 MHz* 3 1.0 µV
FM (12 dB SINAD)
28.0–29.9900 MHz* 1 0.5 µV
50.0–54.0000 MHz* 2 0.25 µV
144.0–148.0000 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 µV
FM
Less than 1.0 µV
• Selectivity (typical) :
SSB (at 2.4 kHz bandwidth)
More than 2.4 kHz/–6 dB
Less than 3.2 kHz/–40 dB
Less than 3.6 kHz/–60 dB
Less than 4.3 kHz/–80 dB
CW (at 500 Hz bandwidth)
More than 500 Hz/–6 dB
Less than 700 Hz/–60 dB
RTTY (at 350 Hz bandwidth)
More than 360 Hz/–6 dB
Less than 650 Hz/–60 dB
AM (at 6 kHz bandwidth)
More than 6.0 kHz/–6 dB
Less than 15.0 kHz/–60 dB
FM (at 15 kHz bandwidth)
More than 12 kHz/–6 dB
Less 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 % distortion
with 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
Ω
All stated specifications are subject to change without notice or obligation.