Icom IC-746 User Manual Download | Manualshive

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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 may cause undesired operation.

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Summary of Contents for IC-746

Page 1: ...ice 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 receive...

Page 2: ...iods 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...

Page 3: ...8 7 MEMORY CHANNELS 49 54 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 51 7 6 Programming a memory 51 7 7...

Page 4: ...pushed momentarily Starts to tune the antenna manually when pushed for 2 sec When the tuner cannot tune the antenna the tuning circuit is bypassed automatically after 20 sec u ANTENNA SELECTOR SWITCH...

Page 5: ...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 to toggle the attenuator function ON and OFF 9 NOISE BLANKER SWIT...

Page 6: ...an operating band GENE selects the general coverage band Push the same key 2 or 3 times to call up stacked frequencies in the band Icom s band stacking register memorizes 3 frequen cies and modes in e...

Page 7: ...when the squelch is open 7 LOCK INDICATOR LOCK p 40 Lights when the dial lock function is activated 8 SPEECH SWITCH SPEECH p 77 Announces the selected readout frequency when an optional UT 102 is inst...

Page 8: ...quency and operat ing mode into the displayed memory channel when pushed for 2 sec This function is available in both VFO and memory modes 9 MEMORY CLEAR SWITCH M CL p 50 Clears the selected readout m...

Page 9: ...r VFO A VFO B the call channel or memory mode is selected 0 BLANK MEMORY INDICATOR p 49 Appears when the selected memory channel is blank 1 SELECT MEMORY INDICATOR p 57 Appears when the selected memor...

Page 10: ...GC DUP 1 4 RTY SCP 2125 RTTY Mark RTY F1 F2 F1 F2 F3 F4 F5 M1 AGC DUP TON TSQ SCP F1 F2 F3 F5 M1 AGC DUP CMP SCP VFOA SSB MODE BAND SCOPE MENU RTTY MODE AM MODE FM MODE CW MODE To band scope menu EDIT...

Page 11: ...ET MENU LCD MENU MEMORY NAME MENU NAME EDIT MENU p 53 p 66 p 53 p 60 SCAN MENU pgs 56 58 2 2 Menu set 2 flow chart MENU MODE F1 F2 F3 F4 F5 SSB q AGC w DUP e CMP r TCN t SCP CW AGC DUP y 1 4 u KEY SCP...

Page 12: ...T ELEC KEY MIC M CH V M CALL M VFO LOCK XFC TWIN PBT NR APF ANF AF RF SQL NR APF RIT TX MIC GAIN RF PWR CW PITCH P AMP ATT KEY SPEED NB VOX BK IN MONITOR SPEECH LOCK TX RX MENU SSB CW RTTY AM FM FILTE...

Page 13: ...follows While pushing F INP M CL push POWER to turn power ON After the CPU has been reset turn power ON by pushing POWER only Push POWER for 1 sec to turn power OFF F INP M CL POWER BLANK CH ANT USB A...

Page 14: ...t ting of the RF SQL control When setting as RF gain squelch control When setting as RF gain squelch is fixed open Adjusting RF gain receive sensitivity Normally RF SQL is set to the 11 o clock positi...

Page 15: ...modes Pushing V M for 2 sec transfers the contents of the se lected memory channel to VFO mode p 50 3 4 Toggling between VFO A B and transferring contents In VFO mode VFO A or VFO B can be selected I...

Page 16: ...memorized in the second band stacking register Push 21 again then select another frequency and operating mode This frequency and operating mode are memorized in the third band stacking register When...

Page 17: ...ed off in set mode if desired p 61 Tuning steps automatically change according to the rate at which the tuning dial is rotated When rotated slowly one complete revolution of the tuning dial changes th...

Page 18: ...uning steps can be set individually for each operating mode Push TS again to exit tuning step program mode 1 Hz TUNING For critical tuning a 1 Hz tuning step can be selected While the tuning step func...

Page 19: ...perating fre quency In addition in CW and RTTY modes pushing CW RTTY for 2 sec toggles between reverse and normal modes SSB mode Above 10 MHz USB is automatically selected below 10 MHz LSB is automati...

Page 20: ...e near you w Noise blanker p 39 The noise blanker is used to reduce pulse type noise caused by vehicle ignition systems and key clicks from strong CW signals on nearby frequencies e Noise reduction p...

Page 21: ...ference In addition the speech compres sor function p 46 can be used to increase your talk power Push SSB to select LSB or USB Push MENU to select M1 Push F4 to display the tone control menu Push MONI...

Page 22: ...ase the pitch frequency counterclockwise to decrease the pitch frequency NOTE When adjusting the CW pitch and the audio peak frequency is ON see above the center fre quency of the audio peak filter ma...

Page 23: ...noise compo nents and picks out desired signals which are buried in noise This function digitally transposes receive audio components to produce desired AF frequency characteristics at the IF stage r...

Page 24: ...y your CW signals The P0 meter indicates transmitted CW signal strength ABOUT KEYING SPEED CW SIDE TONE FUNCTION The transceiver s internal electronic keyer speed can be adjusted from 6 to 60 wpm Rota...

Page 25: ...1 1 F CW M1 AGC DUP 1 4 KEY SCP Memory keyer menu Keyer set SET menu Contest number 001 menu Edit EDT menu Transmit SND menu ELECTRONIC KEYER FUNCTIONS The transceiver has a number of convenient func...

Page 26: ...aracters can be sent using the memory keyer send menu Contents of the memory keyer are set using the edit menu Push TRANSMIT to set the transceiver to transmit or set the break in function ON p 44 Whe...

Page 27: ...s contact numbers etc Total capacity of the memory keyer is 50 characters per memory channel Push F1 M1 to select memory for editing Input the desired character by rotating the tuning dial or by pushi...

Page 28: ...e below for details Push MENU 2 times to return to regular operation M1 This item sets the numbering system used for con tact serial numbers normal or morse cut numbers Normal does not use morse cut n...

Page 29: ...de tone level limit When the AF control is rotated above a specified level the CW side tone does not increase OFF CW side tone level is not limited ON CW side tone level is limited When sending CW usi...

Page 30: ...e at tenuator prevents a desired signal from distorting when very strong signals are near the desired fre quency or when very strong electric fields such as from a broadcasting station are near you w...

Page 31: ...ate AF to set audio to a comfortable listening level Push TRANSMIT to set the transceiver to the transmit condition or transmit a SEND signal from your TNC The P0 meter indicates transmitted RTTY sign...

Page 32: ...ou w Noise blanker p 39 The noise blanker is used to reduce wide pulse type caused by vehicle ignitions and key clicks from strong CW signals on nearby frequencies In some cases using the noise blanke...

Page 33: ...phone to transmit The P0 meter indicates transmitted AM signal strength Push TRANSMIT or release PTT to return to re ceive Convenient functions for transmit q Speech compressor p 46 The speech compres...

Page 34: ...a beep sounds and the tone frequency is programmed into the selected mode Tone scan pauses when a tone frequency is detected Tone squelch operation is a method of communica tions using selective call...

Page 35: ...and sensitivity The at tenuator prevents a desired signal from distorting when very strong signals are near the desired fre quency or when very strong electric fields such as from a broadcasting stati...

Page 36: ...set repeater operation with the push of one switch To set the transceiver for repeater operation using the one touch repeater function follow the steps above but instead of steps and push AM FM for 2...

Page 37: ...e auto repeater function OFF in set mode p 62 Turn the quick split function ON in set mode p 61 Push AM FM to select FM mode Pushing AM FM toggles between AM and FM modes Push A B to select VFO A Rota...

Page 38: ...ansmitting won t cause inter ference to other stations on the same frequency Connect a TNC and personal computer p 68 Push a band key to select an operating band Push a mode key to select an operating...

Page 39: ...ing a signal you wish to communicate on simple communicate normally If you want to return to the previous frequency before ro tating the tuning dial push F3 for 2 sec While receiving if you want to up...

Page 40: ...s in the front end circuit to improve the S N ratio and sensitivity Set this to preamp 1 or preamp 2 when receiving weak signals The attenuator prevents a desired signal from distort ing when very str...

Page 41: ...ion is not effective for AM and FM or non pulse type noise Push NB to toggle the noise blanker function ON and OFF When the noise blanker function is turned ON in AM mode and a strong signal is receiv...

Page 42: ...s function electronically locks the tuning dial Push LOCK to toggle the dial lock function ON and OFF When the dial lock function is turned ON the LOCK in dicator lights red LOCK Lights when the dial...

Page 43: ...ion electronically narrows the receiver s IF passband widths to reduce interference Moving both TWIN PBT controls to the same position shifts the IF Rotate the TWIN PBT controls to adjust this func ti...

Page 44: ...2 1 8 kHz FL 96 2 8 kHz FL 257 3 3 kHz FL 101 250 Hz FL 232 350 Hz FL 100 500 Hz FL 223 1 9 kHz FL 103 2 8 kHz Mixer 9 MHz IF filter 455 kHz IF filter 9 MHz optional filters 455 kHz optional filters 3...

Page 45: ...the function is ON Push VOX BK IN for 2 sec to select VOX program mode ADJUSTING THE VOX GAIN ADJUSTING THE ANTI VOX ADJUSTING THE VOX DELAY Push F1 or F2 to select VOX Gain While speaking into the mi...

Page 46: ...lly returns to receive after a pre set time from when you stop key ing Push CW RTTY to select CW or CW R mode Push VOX BK IN one or more times to select semi break in operation BK IN appears when semi...

Page 47: ...NU or MONITOR to return to menu set 1 MONITOR Tuning dial MENU BLANK CH VFOA ANT AGC AMP P SWR ALC Po S 1 20 50 3 3 2 1 1 5 5 7 9 20 40 60 100 1 1 S USB MONITOR Level MON MONI The TX functions shifts...

Page 48: ...SB and AM modes Push SSB or AM FM to select SSB or AM mode While menu set 1 is selected push F3 CMP to turn the speech compressor ON COMP appears when the function is ON Set the MIC GAIN to the 9 to 1...

Page 49: ...t frequency operation allows you to transmit and re ceive in the same mode on two different frequencies one in VFO A the other in VFO B EXAMPLE Operating split with VFO A set to receive 7 06200 MHz LS...

Page 50: ...e the tuning dial to set the frequency offset between transmit and receive When XFC is released the receive frequency is indi cated SPLIT LOCK FUNCTION SPLIT OFFSET FREQUENCY SETTING By setting an oft...

Page 51: ...memory mode IN VFO MODE Push V M to select VFO mode if necessary then rotate M CH to select a memory channel number All memory channels including blank channels can be selected BLANK appears when no...

Page 52: ...ry channels become blank chan nels The scan edge channels P1 and P2 and the call channel cannot be cleared Push V M to select memory mode if necessary Rotate M CH to select the memory channel to be cl...

Page 53: ...ears if the selected memory channel is a blank channel and does not have contents Push MW for 2 sec to program the displayed fre quency and operating mode into the memory chan nel To check the program...

Page 54: ...4 00000 MHz as the lower frequency Push MW for 2 sec to program 14 00000 MHz into scan edge P1 Rotate M CH to select scan edge P2 Rotate the tuning dial to set 14 35000 MHz as the upper frequency Push...

Page 55: ...d can be used EXAMPLE Programming DX spot into memory channel 99 Push V M to select memory mode if necessary Rotate M CH to select memory channel 99 Push MENU to select menu set 2 Push F2 MEM to selec...

Page 56: ...its own unique combination of frequency and operating mode memo pads having identical settings cannot be writ ten AGC SWR ALC Po S 1 20 50 3 3 2 1 1 5 5 7 9 20 40 60 100 M1 AGC DUP CMP TCN SCP FM F CH...

Page 57: ...F5 Tuning dial MENU SCN 10k F PRO F FIN SPN SET SCAN Speed HIGH SET SET SCAN Resume ON When the squelch is open scan continues until it is stopped manually it does not pause on detected sig nals When...

Page 58: ...0 MHz and 29 99999 MHz respectively See p 56 for program ming scan edges Push V M to select VFO mode if necessary Push a mode key to select the desired operating mode Operating mode can also be select...

Page 59: ...top memory scan The MHz and kHz decimal points flash during scan At least 2 memory channels must be programmed for memory scan to proceed Rotating the tuning dial during memory scan cancels the scan S...

Page 60: ...ory channel is specified by the span Push V M to select memory mode or VFO mode as desired Push MENU to select M2 Push F1 to select the scan menu Push F4 one or more times to select the desired span v...

Page 61: ...R CANNOT TUNE THE ANTENNA Check the unaltered antenna SWR less than 3 1 for HF bands less than 2 5 1 for 50 MHz band Repeat manual tuning several times Tune with a 50 dummy load and re tune the an ten...

Page 62: ...vel for confirmation beep tones The level is selectable from 0 to 100 in 1 steps When beep tones item 7 are turned OFF this setting has no effect 2 BeeP Level lmt This item allows you to set a maximum...

Page 63: ...function can be turned OFF for silent op eration See item 1 for setting the volume level 8 Band Edge Beep A beep sounds each when an operating frequency enters or exits an amateur band This functions...

Page 64: ...repeater offset for the 50 MHz band The offset frequency can be set from 4 MHz to 4 MHz in 1 kHz steps 16 DUP Offset 144M This item sets the offset difference between transmit and receive frequencies...

Page 65: ...tivated and selects an antenna manually When OFF is selected the antenna switch is not ac tivated and does not function The ANT1 connector is always selected in this case 22 SPEECH Language When the o...

Page 66: ...transceiver has its own Icom standard address in hexadecimal code The IC 746 s is 56h When 2 or more IC 746 s are connected to an op tional CT 17 LEVEL CONVERTER rotate the tuning dial to select a di...

Page 67: ...ting frequency for 9 999 00 MHz Other standard frequencies can also be used Select CAL Marker in set mode p 60 and set to ON Adjust the calibration pot CAL on the rear side of the transceiver for a ze...

Page 68: ...N SCP VFOA SWR 3 2 1 1 5 11 4 Adjusting the LCD The function display backlighting and contrast can both be adjusted to suit your preference and to provide op timum readability under varying lighting c...

Page 69: ...RTTY AM FM FILTER MW MP W HF VHF TRANSCEIVER MP R TS M CL RIT TX CLEAR 1 8 1 3 5 2 7 3 10 4 14 5 18 144ENT 6 21 7 24 8 28 9 GENE 50 0 A B SPLIT F INP HEADPHONES ELECTRONIC KEYER MICROPHONES CONNECTOR...

Page 70: ...50 MHz ANTENNA p 70 ANT2 ANT1 PS 85 optional HF 50 MHz ANTENNA p 70 SP 20 optional Impedance 4 8 Input for external remote control signals Connect this terminal to a ground to prevent electrical shoc...

Page 71: ...POWER SUPPLY or non Icom power supply etc when operating the transceiver with AC power Refer to the diagrams below CAUTION Before connecting the DC power cable check the following important items Mak...

Page 72: ...ssion line should be a coaxial cable When using 1 antenna use the ANT1 connector v CAUTION Protect your transceiver from lighten ing by using a lightening arrestor ANTENNA SWR Each antenna is tuned fo...

Page 73: ...n optional external antenna tuner and HF antenna are connected to ANT1 and a 50 MHz antenna is connected to ANT2 ANTENNA SELECT FUNCTION Manual ANTENNA SELECT FUNCTION OFF In this case only ANT1 and t...

Page 74: ...0 3 V 5 mA 6 SQLS Goes to ground when squelch Squelch closed More than 6 0 V 100 A opens 7 13 8 V 13 8 V output when power is ON Output current Max 1 A Connected in parallel with ACC 2 pin 7 Control v...

Page 75: ...3 4 5 6 7 8 BREAK SWITCH SELECTOR MAGNETS RTTY DEMODULATOR LOOP CURRENT POWER SUPPLY 1RTTY 5AF 2GND AF 60 mA or 20 mA LOOP TTY MACHINE ACC 1 SOCKET PHOTO COUPLER 5 V LEVEL CONVERTER When operating RTT...

Page 76: ...l mini plug cable CONTROLLER TO IC 746 FE FE 56 E0 Cn Sc Data area FD Preamble code fixed Transceiver s default address Controller s default address Command number see table at right Sub command numbe...

Page 77: ...ing step 11 3 xx Toggles ATT ON OFF 0 OFF 20 ON 12 01 Selects ANT1 connector 02 Selects ANT2 connector 00 Sets UT 102 for S level freq mode 13 01 Sets UT 102 for S level freq 02 Sets UT 102 for mode 0...

Page 78: ...therwise there is danger of elec tric shock and or equipment damage Carrying handle Top cover Bottom cover Shield cover Shield cover Speaker screws Remove the 2 screws from the left side of the trans...

Page 79: ...rn the PLL UNIT and bottom cover to their orig inal positions J701 UT 102 Connect a frequency counter here and adjust the frequency to 60 00000 MHz J262 J151 J121 Internal crystal PLL UNIT CR 282 L190...

Page 80: ...4k 9M 455k FIL 2 4k 2 4k 9M 455k Selects the 455 kHz filter Selects the 9 MHz filter Filter program mode When selecting the narrow filter 9 MHz filter 1 455 kHz filter 9 MHz filter 2 D INSTALLATION Re...

Page 81: ...SEND relay are 16 V DC 2 A If this level is exceeded a large ex ternal relay must be used RF OUTPUT RF INPUT ALC SEND SEND ALC Antenna Supplied cable IC 746 Non Icom linear amplifier GND GND GND CONN...

Page 82: ...c The transceiver automatically selects CW mode and out put power of 10 W then automatically tunes the con nected antenna TUNE flashes during tuning When tuning is complete the previously selected ope...

Page 83: ...ed fuse with a new rated fuse v CAUTION DISCONNECT the DC power cable from the transceiver when changing a fuse The IC 746 has 2 types of fuses installed for trans ceiver protection DC power cable fus...

Page 84: ...d The transceiver is in the transmitting condition An external speaker or headphones are connected The antenna is not connected properly The antenna feed line is cut or shorted The antenna for another...

Page 85: ...gh COMP GAIN is rotated too far clock wise with the speech compressor ON The dial lock function is activated The internal CPU has malfunctioned 2 or more memory channels have not been programmed 2 or...

Page 86: ...kg 19 lb 10 oz CI V connector 2 conductor 3 5 d mm 1 8 TRANSMITTER Output power USB LSB FM 5 100 W AM 5 40 W Modulation system USB LSB AM Balanced modulation FM Variable reactance modulation Spurious...

Page 87: ...CW nar FL 52A FL 53A FL 96 FL 222 and FL 257 455 kHz FILTERS FL 52A 500 Hz 6 dB CW RTTY nar FL 53A 250 Hz 6 dB CW nar FL 96 2 8 kHz 6 dB SSB wide FL 222 1 8 kHz 6 dB SSB nar FL 257 3 3 kHz 6 dB SSB w...

Page 88: ...Count on us 6 9 16 Kamihigashi Hirano ku Osaka 547 0002 Japan A 5482H 1EX i Printed in Japan 1997 Icom Inc...

Page 89: ...EDT to select the memory edit menu Push F1 ABC one or more times to select the type of characters for input ABC inputs capital letters A to Z abc inputs small letters a to z etc is used to input other...

Page 90: ......

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