Equipment information

Icom IC-446S Transceiver
Manufacturer
Icom
Model IC-446S
Date 1999
Category: Radio, Communication
Group Transceiver
Description FM TRANSCEIVER
Information
                                    Ô GENERAL
Number of channels : 8 ch
Type of emission : 8K50F3E
Frequency stability : ±2.5 kHz
Frequency resolution : 12.5 kHz
Power supply requirements : 3 ´ AA(R6) dry, alkaline;
(negative ground) or optional BP-202
Current drain : Less than 500 mA
Operating temperature range : –20°C to +55°C
Number of CTCSS frequency : 38 (67.0–250.3 Hz)
Dimensions (mm) : 55.5(W)´102.5(H)´26.5(D)
(proj. not included)
Weight (included 3 cells) : 180 g
Ô TRNSMITTER
Output power : 500 mW
Modulation system : Variable reactance
frequency modulation
Max. freqequency deviation : ±2.5 kHz
Spurious emissions : Less than 0.25 μW
Adjacent channel power : More than 60 dB
External mic.connector : 3-conductor
2.5(d) mm/2.2 k½
Ô RECEIVER
Receiving system : Double conversion
superheterodyne
Intermediate frequency : 1st 21.7 MHz
2nd 450 kHz
Sensitivity (12 dB SINAD) : Less than 0.25 μV; –12 dBμV
Adjcent chnnel selectivity : 55 dB
Spurious response : 65 dB
Intermoduration : 60 dB
Audio output power : 100 mW at 10% distortion
(at 4.5 V DC) with an 8 ½ load
External SP connector : 2-conductor
3.5 (d) mm (1⁄8")/8 ½

These manuals are available for the above equipment:

Icom -- IC-446S -- Service Manual
File name Icom-6902-Manual-Page-1-Picture
Manual Type Service Manual
Pages 27
Size 946.05 Kbytes (968757 Bytes)
Language english
Revision
Manual-ID/Number S-136007II-CD
Date 1999
Quality Electronic document, no scan, very well readable.
Upload date
MD5 c9954d5e10f2e1238e0f9abe264ea1a1
Downloads 79 since 19 July 2015
Information
This service manual describes the latest service information
for the IC-446S PMR446 FM TRANSCEIVER at the time of
publication.

SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASEMBLY INSTRUCTION
SECTION 4 CIRCUIT DESCRIPTION
4-1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . .4-1
4-2 TRANSMITER CIRCUITS . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. .4-2
4-3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . .4-2
4-4 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
4-5 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . .4-3
SECTION 5 ADJUSTMENT PROCEDURES
5-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . .5-1
5-2 PLL AND TRANSMITTER ADJUSTMENTS . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . .5-2
5-3 RECEIVER ADJUSTMENT . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. .5-3
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
SECTION 8 SEMI-CONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
9-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . .9-1
9-2 RF UNIT . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . .9-3
SECTION 10 BLOCK DIAGRAM
SECTION 11 VOLTAGE DIAGRAM
11-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . .11-1
11-2 RF UNIT . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . .11-2
Icom-6902-Manual-Page-1-Picture
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