Icom - IC-446S - Transceiver
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Equipment:
IC-446S
Date:
1999
Category:
Group:
Sub Group:
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
1 Manual
Service manual
Manual type:
Service manual
Pages:
27
Size:
946.1 KB
Language:
english
Revision:
Manual-ID:
S-136007II-CD
Date:
Quality:
Electronic document, no scan, very well readable.
Upload date:
July 19, 2015
MD5:
c9954d5e-10f2-e123-8e0f-9abe264ea1a1
Downloads:
685
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