IC-746_user.pdf

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1、INSTRUCTION MANUAL VHF/HF ALL MODE TRANSCEIVER i746 This device complies with Part 15 of the FCC rules. Operation is sub- ject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that m

2、ay cause undesired operation. Downloaded by? Amateur Radio Directory? ? www.hamdirectory.info The IC-746s which display the “CE” symbol, comply with the essential requirements of the 89/336/EEC di- rective for Electromagnetic Compatibility. This compli- ance is based on conformity with the ETSI spec

3、ifi cation prETS300 684 (EMC product standard for Commer- cially Available Amateur Radio Equipment). ii IMPORTANT WORDDEFINITION RWARNING Personal injury, fire hazard or electric shock may occur. CAUTION Equipment damage may occur. NOTE If disregarded, inconvenience only. No risk of personal injury,

4、 fi re or electric shock. READ THIS INSTRUCTION MANUAL CAREFULLY before attempting to operate the transceiver. SAVE THIS INSTRUCTION MANUALThis manual contains important safety and operating instructions for the IC-746. PRECAUTIONS RWARNING!HIGH VOLTAGE! NEVER attach an antenna or internal antenna c

5、onnector during trans- mission.This may result in an electric shock or burn. RNEVER apply AC to the DC13.8V socket on the transceiver rear panel. This could cause a fi re or ruin the transceiver. RNEVER apply more than 16 V DC, such as a 24 V battery, to the DC13.8V socket on the transceiver rear pa

6、nel.This could cause a fi re or ruin the transceiver. RNEVER let metal, wire or other objects touch any in- ternal part or connectors on the rear panel of the trans- ceiver.This may result in an electric shock. NEVER allow children to play with equipment contain- ing a radio transmitter. NEVER expos

7、e the transceiver to rain, snow or any liq- uids. AVOID using or placing the transceiver in areas with temperatures below 10C (+14F) or above +60C (+140F). Be aware that temperatures on a vehicles dashboard can exceed 80C (+176F), resulting in per- manent damage to the transceiver if left there for

8、ex- tended periods. AVOID placing the transceiver in excessively dusty en- vironments or in direct sunlight. AVOID placing the transceiver against walls or putting anything on top of the transceiver. This will obstruct heat dissipation. During mobile operation, DO NOT operate the trans- ceiver witho

9、ut running the vehicles engine. When transceiver power is ON and your vehicles engine is OFF, the vehicles battery will soon become exhausted. Make sure the transceiver power is OFF before start- ing the vehicle.This will avoid possible damage to the transceiver by ignition voltage spikes. During ma

10、ritime mobile operation, keep the transceiver and microphone as far away as possible from the mag- netic navigation compass to prevent erroneous indica- tions. BE CAREFUL! The heatsink will become hot when op- erating the transceiver continuously for long periods. BE CAREFUL! If a linear amplifier i

11、s connected, set the transceivers RF output power to less than the lin- ear amplifi ers maximum input level, otherwise, the lin- ear amplifi er will be damaged. Use Icom microphones only (supplied or optional). Other manufacturers microphones have different pin assignments and connection to the IC-7

12、46 may dam- age the transceiver. EXPLICIT DEFINITIONS The explicit defi nitions described below apply to this in- struction manual. BUILT-IN DSP The IC-746s DSP digitally transposes receive audio components in all modes of operation to produce de- sired AF frequency characteristics at the IF stage o

13、f the transceiver. DSP provides the following functions: Noise reductionreduces various types of noise and enhances receive signal components only. Automatic notch filterautomatically reduces single beat interference and protects the receive voice signals. Selectable APFa total of 3 passband widths

14、are selectable (80/160/320 Hz), for super-narrow filter APF functions in CW mode. The APF center fre- quency is adjustable. DSP iii TABLE OF CONTENTS IMPORTANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii EXPLIC

15、IT DEFINITIONS . . . . . . . . . . . . . . . . . . . . . ii BUILT-IN DSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . iii 1 PANEL DESCRIPTION . . . . . . . . . . . . . . . . . . 27 1-1 Front panel . . . . . . . . . . . . . .

16、 . . . . . . . . . . . . . 2 1-2 Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1-3 Function display . . . . . . . . . . . . . . . . . . . . . . . 7 2 MENU SELECTION . . . . . . . . . . . . . . . . . . . . . 89 2-1 Menu set 1 fl ow chart . . . . . . . . . . . . . . . . . . . 8 2-

17、2 Menu set 2 fl ow chart . . . . . . . . . . . . . . . . . . . 9 3 BASIC OPERATION . . . . . . . . . . . . . . . . . . 1017 3-1 Before operating . . . . . . . . . . . . . . . . . . . . . . 10 3-2 Squelch and receive (RF) sensitivity . . . . . . 12 3-3 Selecting VFO/memory mode . . . . . . . . . . .

18、13 3-4 Toggling between VFO A/B and transferring contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3-5 Setting a band and frequency . . . . . . . . . . . 14 3-6 Selecting an operating mode . . . . . . . . . . . . 17 4 USING DIFFERENT OPERATING MODES . 1836 4-1 Operating SSB . . . .

19、 . . . . . . . . . . . . . . . . . . . 18 4-2 Operating CW . . . . . . . . . . . . . . . . . . . . . . . . 20 4-3 Operating RTTY (FSK) . . . . . . . . . . . . . . . . . 28 4-4 Operating AM . . . . . . . . . . . . . . . . . . . . . . . . 30 4-5 Operating FM . . . . . . . . . . . . . . . . . . . . . .

20、 . . 32 4-6 Repeater operation. . . . . . . . . . . . . . . . . . . 34 4-7 Packet operation . . . . . . . . . . . . . . . . . . . . . . 36 5 FUNCTIONS FOR RECEIVE . . . . . . . . . . . . 3742 5-1 Simple band scope . . . . . . . . . . . . . . . . . . . . 37 5-2 Preamp and attenuator. . . . . . . . .

21、. . . . . . . 38 5-3 RIT function . . . . . . . . . . . . . . . . . . . . . . . . . 38 5-4 AGC function . . . . . . . . . . . . . . . . . . . . . . . . 39 5-5 1/4 function . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5-6 NB function . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5-

22、7 Noise reduction . . . . . . . . . . . . . . . . . . . . . . 40 5-8 Auto notch (ANF) function . . . . . . . . . . . . . . 40 5-9 Dial lock function . . . . . . . . . . . . . . . . . . . . . 40 5-10 Twin PBT . . . . . . . . . . . . . . . . . . . . . . . . . . 41 5-11 Selecting IF fi lters . . . . .

23、. . . . . . . . . . . . . . . 42 6 FUNCTIONS FOR TRANSMIT . . . . . . . . . . . 4348 6-1 VOX function . . . . . . . . . . . . . . . . . . . . . . . . . 43 6-2 Break-in function . . . . . . . . . . . . . . . . . . . . . 44 6-3 :TX function . . . . . . . . . . . . . . . . . . . . . . . . 45 6-4 Monito

24、r function . . . . . . . . . . . . . . . . . . . . . . 45 6-5 Speech compressor . . . . . . . . . . . . . . . . . . . 46 6-6 Split frequency operation . . . . . . . . . . . . . . . 47 6-7 Quick split function . . . . . . . . . . . . . . . . . . . . 48 7 MEMORY CHANNELS. . . . . . . . . . . . . . . .

25、 4954 7-1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 7-2 Memory channel selection . . . . . . . . . . . . . . 49 7-3 Transferring a memory to VFO . . . . . . . . . . . 50 7-4 Clearing a memory . . . . . . . . . . . . . . . . . . . . 50 7-5 Selecting the call channel . . . .

26、 . . . . . . . . . . 51 7-6 Programming a memory . . . . . . . . . . . . . . . . 51 7-7 Programming the call channel . . . . . . . . . . . 52 7-8 Programming scan edges . . . . . . . . . . . . . . 52 7-9 Assigning memory names . . . . . . . . . . . . . . 53 7-10 Memo pads . . . . . . . . . . . . . .

27、 . . . . . . . . . . 54 8 SCAN OPERATION . . . . . . . . . . . . . . . . . . . 5558 8-1 Scan types . . . . . . . . . . . . . . . . . . . . . . . . . . 55 8-2 Programmed scan and fi ne programmed scan . . . . . . . . . . . . . . . . . 56 8-3 Memory scan . . . . . . . . . . . . . . . . . . . . . . . .

28、 57 8-4 Select memory scan . . . . . . . . . . . . . . . . . . . 57 8-5 : F scan and fi ne :F scan . . . . . . . . . . . . . . 58 9 INTERNAL ANTENNA TUNER . . . . . . . . . . . . . 59 9-1 Before operating . . . . . . . . . . . . . . . . . . . . . . 59 9-2 Tuner operation . . . . . . . . . . . . . .

29、. . . . . . . . . 59 10 SET MODE . . . . . . . . . . . . . . . . . . . . . . . . . 6064 10-1 Selecting set mode . . . . . . . . . . . . . . . . . . . 60 10-2 Set mode items . . . . . . . . . . . . . . . . . . . . . 60 11 ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . 6566 11-1 Tuning dial bra

30、ke . . . . . . . . . . . . . . . . . . . . 65 11-2 Frequency calibration . . . . . . . . . . . . . . . . . 65 11-3 Measuring SWR . . . . . . . . . . . . . . . . . . . . . 66 11-4 Adjusting the LCD . . . . . . . . . . . . . . . . . . . 66 12 SETUP AND CONNECTIONS . . . . . . . . . . 6775 12-1 Front p

31、anel . . . . . . . . . . . . . . . . . . . . . . . . . 67 12-2 Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . 68 12-3 Selecting a location . . . . . . . . . . . . . . . . . . 69 12-4 Power supply connections . . . . . . . . . . . . . 69 12-5 Grounding . . . . . . . . . . . . . . . . .

32、. . . . . . . . 70 12-6 Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 12-7 Data communications . . . . . . . . . . . . . . . . . 72 12-8 RTTY connections . . . . . . . . . . . . . . . . . . . 73 12-9 Remote jack . . . . . . . . . . . . . . . . . . . . . . . . 74 13 OPTIONAL INSTAL

33、LATIONS . . . . . . . . . . 7680 13-1 Opening the transceivers case . . . . . . . . . 76 13-2 UT-102 VOICE SYNTHESIZER UNIT. . . . . . . . . 77 13-3 CR-282 HIGH STABILITY CRYSTAL UNIT. . . . . 77 13-4 Optional IF fi lters . . . . . . . . . . . . . . . . . . . . 78 13-5 Linear amplifi er connections

34、. . . . . . . . . . . 79 13-6 External antenna tuner connections . . . . . . 80 14 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . 8183 14-1 Fuse replacement . . . . . . . . . . . . . . . . . . . 81 14-2 Resetting the CPU . . . . . . . . . . . . . . . . . . . 81 14-3 Troubleshooting . . . . .

35、. . . . . . . . . . . . . . . . 82 15 SPECIFICATIONS AND OPTIONS . . . . . . 8485 15-1 Specifi cations . . . . . . . . . . . . . . . . . . . . . . . 84 15-2 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 2 1PANEL DESCRIPTION 1-1 Front panel q POWER SWITCH POWER Push momentarily t

36、o turn power ON. (p. 11) Turn the optional DC power supply ON in advance. Push and hold to turn power OFF. w TRANSMIT SWITCH TRANSMIT Toggles between transmit and receive. The TX indicator lights red while transmitting and the RX indicator lights green when the squelch is open. e HEADPHONE JACK PHON

37、ES (p. 67) Accepts headphones. When headphones are connected, the internal speaker or connected external speaker does not function. r ELECTRONIC KEYER JACK ELEC-KEY (p. 67) Accepts a paddle to activate the internal electronic keyer for CW operation. Selection between the internal electronic keyer, b

38、ug-key and straight key operation can be made in keyer set mode. A straight key jack is separately available on the rear panel. Key polarity (dot and dash) can be reversed in keyer set mode. 4-channel memory keyer is available for your conve- nience. t MICROPHONE CONNECTOR MIC Accepts the supplied o

39、r optional microphone. See p. 85 for appropriate microphones. See p. 67 for microphone connector information. y ANTENNA TUNER SWITCH TUNER (p. 59) Turns the antenna tuner ON and OFF (bypass) when pushed momentarily. Starts to tune the antenna manually when pushed for 2 sec. When the tuner cannot tun

40、e the antenna, the tuning circuit is bypassed automatically after 20 sec. u ANTENNA SELECTOR SWITCH ANT (p. 71) Toggles between the HF and 50 MHz antenna con- nectors. i NOISE REDUCTION LEVEL CONTROL NR (p. 40) Adjusts the noise reduction level when the noise re- duction function is in use. Set for

41、maximum read- ability. o AUDIO PEAK FILTER CONTROL APF (p. 20) Varies the peak frequency of the audio peak fi lter to pick out a CW signal from interference while the APF function is ON. !0 NOISE REDUCTION SWITCH NR (p. 40) Toggles the noise reduction function ON and OFF. Functions in SSB, CW and RT

42、TY modes. !1 AUDIO PEAK FILTER/AUTO NOTCH SWITCH APF/ANF Toggles between the audio peak (p.20) and auto notch (p. 40) functions. The audio peak fi lter functions in CW mode only; the auto notch functions in SSB, FM and AM modes only. The APF or ANF indicator appear in the display de- pending on whic

43、h function is selected. When the APF indicator appears, push this switch for 1 sec., one or more times to select 320 Hz, 160 Hz or 80 Hz bandwidths. Use the APF control to vary the peak frequency. !2 AF CONTROL AF (inner control; p. 12) Varies the audio output level from the speaker. PHONES TRANSMIT

44、 POWER TUNERANT ELEC-KEY MIC NRAPF/ANF AFRF/SQL NRAPF 1 2 3 4 5 6 7 8 9 !1 !2 !3 !0 3 1PANEL DESCRIPTION !3 RF GAIN/SQUELCH CONTROL RF/SQL (p. 12) Adjusts the RF gain and squelch threshold level. The squelch removes noise output from the speaker (closed condition) when no signal is received. The squ

45、elch is particularly effective for FM. It is also available for other modes. The control can be set as the RF gain control only (squelch is fixed open) or squelch control (RF gain is fi xed at maximum) in set mode. !4 MIC GAIN CONTROL MIC GAIN Adjusts the microphone input gain. !5 RF POWER CONTROL R

46、F PWR (p. 84) Continuously varies the RF output power from mini- mum (2 W*) to maximum (100 W*). *AM mode: 240 W, other modes: 5100 W. !6 CW PITCH CONTROL CW PITCH (p. 20) Shifts the received CW audio pitch and monitored CW audio pitch without changing the operating fre- quency. The pitch can be cha

47、nged from 300 to 900 Hz in approx. 3 Hz steps. !7 ELECTRONIC CW KEYER SPEED CONTROL KEY SPEED (p. 22) Adjusts the internal electronic CW keyers speed. 6 wpm to 60 wpm can be set. !8 PREAMP/ATTENUATOR SWITCH P.AMP/ATT (p. 38) Push momentarily to toggle between preamp-1 and preamp-2. Push for 1 sec. t

48、o toggle the attenuator function ON and OFF. !9 NOISE BLANKER SWITCH NB (p. 39) Toggles the noise blanker ON and OFF. The noise blanker reduces pulse-type noise such as that gen- erated by automobile ignition systems.This function cannot be used for FM, or non pulse-type noise. 0 VOX/BREAK-IN SWITCH

49、 VOX/BK-IN In SSB, AM and FM modes, push momentarily to turn the VOX function ON; push for 1 sec. to turn the VOX function OFF. (p. 43) In CW mode, push momentarily to select semi break-in, full break-in or break-in OFF; push for 2 sec. to enter break-in set mode. (p. 44) 1 MONITOR SWITCH MONI (p. 45) Push to toggle the monitor function ON and OFF. Push for 2 sec. to enter and exit monitor set mode. Adjustable range Maximum RF gain Maximum RF gain sensitivity Minimum RF gain sensitivity Setting squelch Setting RF gain Squelch threshold Squelch open S-mete