Equipment information

Icom IC-761 Transceiver
Manufacturer
Icom
Model IC-761
Date 1988
Category: Radio, Communication
Group Transceiver
Description HF All Band Transceiver General Coverage Receive
Information
                                    ■ COMPLETE HF TRANSCEIVER

•	BUILT-IN AUTOMATIC ANTENNA TUNER
The IC-761 is equipped with an advanced HF antenna tuner
system for quick, complete, and well matched antenna
performance.

•	FULL BREAK-IN FUNCTION
Full break-in as well as semi break-in operation are
provided for smooth, fast, and natural CW conversations.

• BUILT-IN ELECTRONIC KEYER FUNCTION
Automatic keying is possible in the IC-781 with the simple
connection of an iambic paddle. The number of dots and
dashes can be controlled by the operator with the result
that CW operation is easier and more enjoyable.

•	BUILT-IN HIGH STABILITY CRYSTAL UNIT
The IC-761 has a built-in high stability crystal unit which
incorporates a temperature-compensating oven heater,
resulting in a frequency stability of less than ±100Hz at —
10°C ~ +60°C.


OUTSTANDING RECEIVER PERFORMANCE

•GENERAL COVERAGE RECEIVER
The IC-761 features general coverage receive capability with
a tuning range from 100kHz to 30MHz. This wide range is
accomplished by means of up-conversion using a high side IF
and a CPU control system.

•ICOM'S DFM SYSTEM
The ICOM DFM (Direct Feed Mixer) feeds the incoming signals
directly into a high level first mixer developed by ICOM.
This advanced system produces a higher spurious response
rejection ratio, a higher receiver sensitivity and a wider
dynamic range.

• 105dB DYNAMIC RANGE
The IC-761 has a 105dB dynamic range. Even with the PREAMP
switched ON, the dynamic range is approximately 100dB.
LARGE MEMORY CAPACITY CPU INSTALLED

•32 MEMORIES
Thirty-two programmable memories are provided to store mode
and frequency, and the CPU is backed up by an internal
lithium battery to maintain the memories for up to ten years.

•ADVANCED REMOTE CONTROL SYSTEM
Full communications using a personal computer equipped with
an RS-232C jack are possible by using the serial port
mounted on the rear panel of the IC-761. The computer
controls frequency, mode, VFO A/B selection, and memories
when an appropriate interface is used. The serial port uses
a standard 1200bps data rate.

•SCANNING VERSATILITY
The IC-761 incorporates a total of four separate scanning
functions for easy access to a wide range of frequencies.

These manuals are available for the above equipment:

Icom -- IC-761 -- User Manual
File name Icom-5434-Manual-Page-1-Picture
Manual Type User Manual
Pages 72
Size 5.41 Mbytes (5674425 Bytes)
Language english
Revision
Manual-ID/Number A-0927
Date 1988
Quality Scanned document, all readable.
Upload date
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Information
1.	PRECAUTIONS AND PREPARATIONS...... 1

2.	FEATURES.......................... 2

3.	CONTROL FUNCTIONS................. 3

3 - 1 FRONT PANEL...................... 6

3-2	FREQUENCY DISPLAY.................15

3	-3 REAR PANEL.......................16

4.	INSTALLATION......................19

4-1	UNPACKING........................19

4	- 2 PLANNING.........................19

4-3 ANTENNA.........................19

4-4 GROUNDING........................19

4-5	REAR PANEL CONNECTIONS.............20

5.	SYSTEM INTERCONNECTIONS...........21

5-1	EXTERNAL LINEAR AMPLIFIER..........21

5-2	EXTERNAL ANTENNA TUNER............22

5-3	RTTY TERMINAL UNIT................23

5-4	AFSK TERMINAL UNIT................23

5	- 5	SSTV UNIT.........................24

5-6	MIC CONNECTOR INFORMATION..........24

5-7	ACCESSORY SOCKET INFORMATION.......24

5-8	REMOTE CONTROL JACK (Cl-V)

INFORMATION......................26

6.	GENERAL OPERATION.................27

6-1	INITIAL SETTINGS....................27

6-2	FREQUENCY SETTINGS................27

6-3	MODE SELECTION....................28

6-4	SSB OPERATION.....................29

6-5	CW OPERATION.....................31

6-6	RTTY OPERATION....................33

6-7	AM OPERATION.....................34

6-8	FM OPERATION.....................35

6-9	GENERAL COVERAGE RECEIVER.........36

7.	ANTENNA TUNER OPERATION..........37

7-1	PRESETTINGS.......................37

7-2	AUTO-TUNING FAILS TO OPERATE........38

8.	FUNCTIONS OPERATION...............39

8-	1 RIT/ATX OPERATION..................39

8- 2 FILTER SWITCH OPERATION.............41

8- 3 MONITOR OPERATION.................42

8- 4 PREAMP/ATT SWITCH OPERATION.........42

8- 5 AGC SWITCH OPERATION...............42

8- 6 SPEECH COMPRESSOR OPERATION........43

8- 7 NOISE BLANKER (NB) OPERATION........43

8- 8 VOX OPERATION....................44

8-	9 PASSBAND/IF SHIFT OPERATION..........45

8-10 NOTCH FILTER OPERATION.............46

8-11 SWR READING......................46

8-12 SPLIT (DUPLEX) OPERATION............47
9.	MEMORY AND SCANNING OPERATION .... 48

9-1 MEMORY CHANNEL AND VFO SELECTION. . .48

9-2 PROGRAMMING MEMORY CHANNELS.......49

9-3 MEMORY CLEARING..................50

9-4 SCANNING OPERATION................51

10.	CIRCUIT DESCRIPTION................53

10-1 R£CEIVER CIRCUITS..................53

10-2 TRANSMITTER CIRCUITS...............54

10-3 ANTENNA TUNER....................54

10-4	PLL CIRCUIT........................55

11.	MAINTENANCE AND ADJUSTMENTS......56

11-1	MAINTENAMCE......................56

11-2	ADJUSTMENTS......................57

12.	OPTIONS INSTALLATIONS..............59

12-1	IC-EX310 VOICE SYNTHESIZER UNIT.......59

12-2 UT-30 PROGRAMMABLE TONE ENCODER

UNIT.............................60

12-3 FILTERS...........?..............60

12-4	OPTIONS..........................62

13.	INSIDE VIEWS.......................63

13 - 1 TOP VIEW (REGULATOR AND TUNER UNITS). . . 63

13-2	BOTTOM VIEW (MAIN AND RF UNITS)......64

14.	BLOCK DIAGRAMS....................65

15.	SPECIFICATIONS.....................67

SCHEMATIC DIAGRAMS.........SEPARATE
Icom-5434-Manual-Page-1-Picture
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