Sign In
Upload
Manuals
Brands
ICOM Manuals
Transceiver
IC-746
ICOM IC-746 Manuals
Manuals and User Guides for ICOM IC-746. We have
4
ICOM IC-746 manuals available for free PDF download: Service Manual, Faq, Instruction Manual
Icom IC-746 Faq (113 pages)
HF/VHF Transceiver
Brand:
Icom
| Category:
Transceiver
| Size: 2.1 MB
Table of Contents
Icom IC-746 Faq
1
Recent Changes
2
Table of Contents
3
1 Administrivia
9
What Is an FAQ
9
Where Can I Get a Copy
9
Where Do I Send Feedback
9
What Are the Future Plans for the FAQ
10
What Questions Still Need to be Answered
11
What Does this Abbreviation or TLA Mean
11
2 General Info
12
Should I Buy an IC-746
12
What Are the IC-746'S Features
12
How Does the IC-746 Stand up to the
12
Where Can I Buy/Sell a Used IC-746
13
How Much Is a Used IC-746 Worth
13
Is There a Dedicated HF Net for the IC-746
14
Are There Electronic Copies of 746 Instruction Manuals
15
Are There Electronic Copies of the Circuit Schematics
15
Are There Electronic Copies of 746 Service Manuals
16
How Do I Fix the Font Substitution Error in the PDF Manual
16
How Does an IC-746S Differ from an IC-746
16
What Is the IC-7400
17
What Is the IC-746-PRO
17
Where Can I Find Info on Other Icom Rigs
18
Where Is Info on the 706, 718, 756, 765, 735
18
What Articles Have Been Written about the IC-746
19
Can I Transmit 100W at 100% Duty Cycle on CW, SSB, RTTY, PSK, Etc
21
I Thought the LCD was Blue, but Photos Show It as Green
22
Can the IC-746 Work on the 60M Band
22
Can the IC-746 Work on the Alaska Emergency Frequency
22
3 Accessories
23
Power Supplies
23
What Power Supply Should I Use with the IC-746
23
Continuous Vs. Intermittent Load
25
Antennas
28
What Antenna Should I Use with the IC-746
28
What Range Can the Automatic Antenna Tuning Unit (ATU) Handle
29
Will the Internal ATU Handle "Random" Wire Antennas
29
Will the Internal ATU Handle "Long Wire" Antennas
29
Are There any "Tips" to Using the ATU
29
Can I Use the Internal ATU Along with an External ATU
29
Does the Internal ATU Work on Receive
30
Any Other "Gotchas" with the Internal ATU
30
How Do I Use a "Beverage" Antenna
31
How Do I Use Different Antennas for Receive Vs. Transmit
31
Split VFO Method
31
External Antenna Switcher Method
31
External RF Sense Antenna Preamp Method
31
How Do I Measure SWR While in SSB
31
How Do I Tune up in CW Without a Key
32
What about Using an External, Automatic, ATU
32
Can the TUNER Button Activate an External Automatic ATU
33
Why Doesn't the Rig SWR Meter Match My External SWR Meter
34
Which SWR Meter Should I Trust: Internal or External
34
How Do I Repair the Detector Diodes in the Internal ATU
35
How Do I Switch between more than Two Antenna Ports
35
Microphones
37
What Is the Best Microphone to Use with the IC-746
37
Can I Hook up a Different Microphone Directly to the IC-746
37
Can I Use a Heil Microphone with the IC-746
38
How Do I Adjust the IC-746 for a Heil Headset
38
Do I Need a Pre-Amp to Use a Heil Microphone
38
What Are the Pin-Outs on the Microphone Connector
39
Keyers
40
Can I Hook My Straight Key to the Front "Elec Key" Jack
40
Can I Connect My Own Electronic Keyer to the IC-746
40
How Do I Wire up My Paddles for Use with the Internal Keyer
40
For a Straight Key or External Keyer
40
To Use the Built in Electronic Keyer with Paddles
40
Can I Use the Internal and External Keyers at the same Time
41
Amplifiers
42
How Do I Hook up an Icom IC-PW1 RF Power Amplifier
42
What if I Hook up more than Just an IC-PW1
42
How Do I Hook up a Non-Icom RF Power Amplifier
43
Do I Really Need an External Amplifier Switching Relay
43
Why Do I Need an External Amplifier Switching Relay
43
My SEND Relay Seems to be Stuck, What Do I Do
47
Where Can I Get an External Switching Relay
47
Can't I Just Use the ACC Port to Key My Amp
48
How Do I Build My Own SEND Relay Isolation Circuit/Relay
48
Why Do I Get IC-746 Birdies When I Turn on My IC-2KL
49
How Do I Hook up a Yaesu Quadra (VL-1000) Amp to an IC-746
49
Tnc
50
How Do I Hook up a TNC to the IC-746
50
4 If Filters
51
How Many Optional if Filters Can I Install into the IC-746
51
What Optional if Filters Are Available for the IC-746
51
Which Optional if Filters Should I Buy
52
What Is an if Filter's "Bandwidth
52
What Is an if Filter's "Shape Factor
52
Why Do Filter "Bandwidth" or "Shape Factor" Matter
53
What Is Considered to be a Narrow Filter
53
What Are Narrow if Filters Used for
53
Can an if Filter be too Narrow
54
What's the Difference between if Filters from Inrad Vs. Icom
54
Which if Should I Put an Optional Filter into
55
What's Different between if Filters for 9Mhz Vs. 455Khz
55
What Are the 9Mhz if Filters Best for
55
What Are the 455Khz if Filters Best for
55
How Do I Get the Best Results from TPBT
55
How Do I Configure the IC-746 to Use an Optional Filter
56
How Do I Configure the IC-746 to Use a Non-Icom Filter
56
How Do I Use a CW Filter in SSB Mode to Receive PSK31
56
Why Is There Only One Optional 455Khz if Filter Slot
57
Any Tips on Installing 9Mhz Inrad Filters
57
Where Do I Install a 2Nd Inrad 9Mhz if Filter
57
Where Can I Find more Information on Filter Characteristics
57
What Are some Popular Filter Combinations
58
5 Computer Control
59
How Do I Wire the IC-746 up for Computer Control
59
What Cables Do I Need
59
What Are CT-17, OPC-478, OPC-662 All about
59
Do I Need a Special Cable to Connect a CT-17 to an IC-746
61
What Is the Control Protocol for the IC-746
61
What Is CI-V
61
What Is the CI-V Address of the IC-746
62
What Computer Software Is Available
62
Where Can I Get Computer Software and Upgrades
62
Why Doesn't Computer Software Update Freq When Tuning the 746
65
How Do I Wire up the IC-746 for Use with PSK31
65
Why Isn't My Computer Control Working
65
6 Problems and Clarifications
66
What's that Funny Rattling Noise I Hear When I First Power on
66
What's that "Click" I Hear as I Tune Across Certain Frequencies
66
Why Doesn't the ALC Meter Work While Adjusting the "MIC Gain
66
Why Can't I Set Numbers into Memory Names, CW Keyer, Etc
66
Why Isn't My Output Power up at 100 Watts
67
Low DC Supply Voltage
67
You Have an IC-746S Instead of an IC-746
67
Blown Internal Fuse
67
The RF Driver Transistors May Have Failed
68
The RF Power Amplifier Transistors May Have Failed
68
Blown Output Detector Diodes
68
Your ALC Circuit May Have Failed
68
SWR Foldback
68
Confused Meter Readings
68
CW Break-In Turned off
69
Internal Adjustments Set a Little Low
69
How Low Can the IC-746 Supply Voltage be
69
The Backlight in My LCD Has Stopped Working. What's Wrong
70
Is There some Way to Get the Icom-746 to Generate DTMF Tones
73
Why Don't My "Band Edge Beeps" Match the US Amateur Bands
74
Can I Transmit All the Way out to the "Band Edge Beeps
74
Can I Reprogram the "Band Edge Beeps
74
Do We Know Anything about the "Band Edge Beeps
74
How I Reset Back to Factory Default Settings
75
What "Birdies" Does the IC-746 Have
75
How Do I Adjust the LCD Display
76
The Noise Blanker Doesn't Seem to Do any Good. What's Wrong
76
How Do I Get Rid of Ignition Noise
77
How Do I Adjust or Make the NB Work Better
77
How Do I Fix a Loose Rubber Grip from the Tuning Knob
78
Where Should I Go for Repairs
78
How Do I Fix Scratches on the LCD
80
What Can I Do about Sticky Switches
80
Why Does the S-Meter Seem Low on 2M FM
81
Why Is My Tuning Shaft/Knob Loose and Sloppy
81
Why Is My Audio Cutting in and out
81
7 Modifications
82
What TX/RX "Mods" Are There for the IC-746
82
What Other "Mods" Are There for the IC-746
82
6Khz Wide if Filters
82
Safe 2M TX/RX Sequencing
83
Simple CAT Interface
83
Separate 2M TX/RX Antenna Lines
83
Increased MONITOR Volume
84
LCD Driver Transistor Replacement
84
Poor Man's TCXO
85
Upgrading Stock Ceramic if Filter to a Crystal Filter
85
Can I Increase My RF Power Output Beyond 100W
85
I'M Brave; What Untested "Mods" Are There
86
Replacing PIN Diodes in the Demodulator
86
Removing the BCB Attenuator
87
What "External" Mods Are There for the IC-746
87
Remote, Direct Frequency Entry Keypad
87
Cordless Headset Microphone
87
Automatic Antenna/Amplifier Selection by Band
87
2M TX/RX Sequencer
88
External Tuner Pulser
88
Unmuffling Icom Hand Mics
89
8 Misc
90
Are There Different Versions of the IC-746
90
Can I Operate 2M on Reduced Power
90
Where Can I Find Plugs for the ACC Connectors
90
What Are the Pin-Outs on the ACC-1 Connector
91
What Are the Pin-Outs on the ACC-2 Connector
92
Does Audio to Pin 4 of ACC-1 Trigger the VOX
92
Where Can I Get Replacement Power Connectors
92
Where Can I Get Replacement Microphone Connectors
93
What Is "Lo-Fi" SSB Operation
93
What Is "Hi-Fi" SSB Operation
93
How Does One Improve the Fidelity of a Received Signal
94
How Does One Improve Transmission Fidelity
95
Can the IC-746 Transmit at Less than 5 Watts
95
How Do I Turn on both HF Pre-Amps at the same Time
95
How Do I Adjust the 746 for Best am Performance
96
Is the IC-746 Suitable for CAP and MARS Operation
96
How Do I Adjust the Noise Reduction (NR)
96
How Do I Program a Non-Standard Repeater Offset
97
How Do I Turn on Repeater (PL) Tones
97
How Do "Zero-Beat" a CW Signal
98
Instruction Manual Errata
99
Incorrect
99
External Speaker and Remote Interface Jacks Are Swapped
99
BAND EDGE BEEPS Simply Do Not Work as Expected
99
Page:19 SSB TX Tone Affects more than SSB
99
TRANSMIT Button Does Not Transmit on CW
99
Only One Bar for CW Sidetone Level, Not Two
100
No ALC Adjustment for FM
100
Incorrect Filter Diagram
100
Page:42 Incorrect
100
No ALC Adjustment for Either am or FM
100
Speech Compressor
100
Page:27 Only One Bar for CW Sidetone Level, Not Two
100
Page:53 Enter Numbers Via Keypad, Not Tuning Dial
101
Page:56 Incorrect
101
Unclear Voltage Specification
101
Overoptimistic SWR Specification
101
Unclear UT-102 Installation Instructions
101
Page:79 Incorrect SEND Relay Specifications
101
Incorrect Bandwidth Listing
101
Service Manual Discrepancies
102
Identity of Q302
102
Identity of R1271
102
Glossary
103
Contributors + Acknowledgements
105
Disclaimer & Copyright
108
Revision History
109
Advertisement
Icom IC-746 Service Manual (130 pages)
HF/VHF
Brand:
Icom
| Category:
Transceiver
| Size: 51.57 MB
Table of Contents
Ordering Parts
2
Repair Notes
2
Table of Contents
3
Specifications
4
Inside Views
5
Main and RF Units
5
PA and CTRL Units
6
Disassembly and Option Instructions
7
Opening the Transceiver's Case
7
UT-102 Voice Synthesizer Unit
7
Optional if Filters
8
CR-282 High Stability Crystal Unit
8
Circuit Description
9
Receiver Circuits
9
RF Switching Circuit
9
RF Filter Circuit
9
1St Mixer and 1St if Circuits
10
2Nd Mixer and 2Nd if Circuits
10
3Rd Mixer and 3Rd if Circuits
10
4Th Mixer Circuit
10
AF Amplifier Circuit
11
AGC Circuit
11
Noise Blanker Circuit
11
S-Meter Circuit
11
Transmitter Circuits
12
Twin PBT Circuit
12
Tone Squelch
12
Microphone Amplifier Circuit
12
VOX Circuit
13
Speech Compressor Circuit
13
IF Amplifier and Mixer Circuits
13
RF and PA Circuits
13
PLL Circuits
14
APC Circuit
14
Temperature Protection Circuit
14
Monitor Circuit
14
Antenna Tuner Circuits
15
Matching Circuit
15
Detector Circuits
15
Marker Circuit
15
Power Supply Circuits
16
Motor Control Circuit
16
Antenna Tuner CPU Port Allocation
16
Port Allocations
17
Adjustment Procedures
21
Preparation before Servicing
21
Required Test Equipment
21
Connection
21
PLL Adjustment
22
Main and RF Units (Bottom Side of the Transceiver)
23
Transmitter Adjustment
24
PA and CTRL Units (Top Side of the Transceiver)
25
Parts List
32
Mechanical Parts
58
Semi-Conductor Information
64
Board Layouts
66
S-Logic Board (Top View)
66
S-Logic Board (Bottom View)
68
Display Board (Top View)
70
Mode Board
70
Phone Board (Top View)
71
PBT, RIT and MIC Boards
72
Phone Board (Bottom View)
72
Display Board
72
Tenkey and Filter Boards
74
Main Unit (Top View)
76
Main Unit (Bottom View)
80
RF Unit (Top View)
84
RF Unit (Bottom View)
86
PA Unit (Top View)
88
CTRL and Tuner Unit
92
Block Diagram
96
Voltage Diagram
100
ICOM IC-746 Instruction Manual (90 pages)
VHF/HF ALL MODE TRANSCEIVER
Brand:
ICOM
| Category:
Transceiver
| Size: 2.08 MB
Table of Contents
Important
2
Explicit Definitions
2
Built-In Dsp
2
Table of Contents
3
1 Panel Description
4
Front Panel
4
Rear Panel
8
Function Display
9
Panel Description
9
2 Menu Selection
10
Menu Set 1 Flow Chart
10
Menu Set 2 Flow Chart
11
Menu Selection
11
3 Basic Operation
12
Before Operating
12
Adjusting Volume
13
Squelch and Receive (RF) Sensitivity
14
Selecting Vfo/Memory Mode
15
Toggling between VFO A/B and Transferring Contents
15
Setting a Band and Frequency
16
Selecting an Operating Mode
19
Basic Operation
19
4 Using Different Operating Modes
20
Operating SSB
20
Operating CW
22
Electronic Keyer Functions
25
Operating RTTY (FSK)
30
Operating am
32
Operating FM
34
Repeater Operation
36
Packet Operation
38
Using Different Operating Modes
38
5 Functions for Receive
39
Simple Band Scope
39
Preamp and Attenuator
40
RIT Function
40
AGC Function
41
1/4 Function
41
NB Function
41
Noise Reduction
42
Auto Notch (ANF) Function
42
Dial Lock Function
42
Twin PBT
43
Selecting if Filters
44
Functions for Receive
44
6 Functions for Transmit
45
VOX Function
45
Break-In Function
46
TX Function
47
Monitor Function
47
Speech Compressor
48
Split Frequency Operation
49
Quick Split Function
50
Functions for Transmit
50
7 Memory Channels
51
General
51
Memory Channel Selection
51
Transferring a Memory to VFO
52
Clearing a Memory
52
Selecting the Call Channel
53
Programming a Memory
53
Programming the Call Channel
54
Programming Scan Edges
54
Assigning Memory Names
55
Memo Pads
56
Memory Channels
56
Scan Operation
57
Scan Types
57
Programmed Scan and Fine Programmed Scan
58
Memory Scan
59
Select Memory Scan
59
F Scan and Fine F Scan
60
Scan Operation
60
9 Internal Antenna Tuner
61
Before Operating
61
Tuner Operation
61
Set Mode
62
Selecting Set Mode
62
Set Mode Items
62
Set Mode
66
Adjustments
67
Tuning Dial Brake
67
Frequency Calibration
67
Measuring SWR
68
Adjusting the LCD
68
12 Setup and Connections
69
Front Panel
69
Rear Panel
70
Selecting a Location
71
Power Supply Connections
71
Grounding
72
Antenna
72
Data Communications
74
RTTY Connections
75
Remote Jack
76
Setup and Connections
77
13 Optional Installations
78
Opening the Transceiver's Case
78
Voice Synthesizer Unit
79
High Stability Crystal Unit
79
Optional if Filters
80
Linear Amplifier Connections
81
External Antenna Tuner Connections
82
Optional Installations
82
14 Maintenance
83
Fuse Replacement
83
Resetting the CPU
83
Troubleshooting
84
Maintenance
85
15 Specifications and Options
86
Specifications
86
Options
87
Advertisement
Icom IC-746 Service Manual (128 pages)
HF/VHF
Brand:
Icom
| Category:
Transceiver
| Size: 50.89 MB
Advertisement
Related Products
ICOM IC-746PRO
ICOM IC-7410
ICOM IC-7400
ICOM IC-740
Icom IC-745
Icom IC-7200
ICOM IC-756PRO III
Icom IC-706MKII
ICOM IC-726
ICOM IC-703
ICOM Categories
Transceiver
Receiver
Repeater
Radio
Two-Way Radio
More ICOM Manuals
Login
Sign In
OR
Sign in with Facebook
Sign in with Google
Upload manual
Upload from disk
Upload from URL