Icom IC-756 User Manual Download

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INSTRUCTION MANUAL

i756

HF/50 MHz
ALL MODE TRANSCEIVER

Summary of Contents for IC-756

Page 1: ...INSTRUCTION MANUAL i756 HF 50 MHz ALL MODE TRANSCEIVER ...

Page 2: ...e transceiver power is OFF before starting the vehicle This will avoid possible damage to the transceiver by ignition voltage spikes During maritime 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 ...

Page 3: ...0 Split frequency operation 31 Quick split function 32 Monitor function 33 VOX function 33 Meter function 34 Speech compressor 34 SWR reading 34 Electronic CW keyer 35 Memory keyer 36 Spectrum scope screen 37 Band memory for automatic antenna selection 37 Repeater operation 38 Dial lock function 38 Antenna tuner operation 39 Optional external tuner operation 40 5 MEMORY OPERATION 41 46 Memory chan...

Page 4: ...RX indicator lights green when the squelch is open e HEADPHONE JACK PHONES Accepts headphones When headphones are connected the internal speaker or connected external speaker does not function r ELECTRONIC KEYER JACK ELEC KEY p 35 Accepts a paddle to activate the internal electronic keyer for CW operation Selection between the internal electronic keyer bug key and straight key operation can be mad...

Page 5: ...WITCH NB p 26 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 5 S RF METER p 34 Shows the signal strength while receiving Shows the relative output power SWR or ALC levels while transmitting 6 MONITOR SWITCH MONITOR p 33 Monitors your transmitted IF sig...

Page 6: ...P AMP1 or P AMP2 when receiving weak signals Selects 6 dB 12 dB or 18 dB attenuator or bypasses them What is the attenuator The attenuator prevents a desired signal from distorting when very strong signals are near the desired frequency or when very strong electric fields such as from a broad casting station are near your location Activates or selects fast middle or slow AGC time constant when pus...

Page 7: ...9 61 Announces the selected readout frequency when an optional UT 102 is installed 4 TUNING DIAL p 23 Changes the displayed frequency selects set mode items etc 5 MAIN SUB SWITCH MAIN SUB Selects the main or sub readout for access The sub readout frequency is displayed in outline and functions only during split operation or dualwatch 6 VFO MEMORY SWITCH VFO MEMO Toggles the selected readout operat...

Page 8: ...he TX frequency Adds the TX shift frequency to the operating fre quency when pushed for 2 sec What is the TX function The TX shifts the transmit frequency without shifting the receive frequency This is useful for simple split frequency operation in CW etc 4 CLEAR SWITCH CLEAR p 29 Clears the RIT TX shift frequency when pushed for 2 sec 5 CW PITCH CONTROL CW PITCH outer control p 27 Shifts the rece...

Page 9: ...K p 38 Lights when the dial lock function is activated 1 MEMO PAD READ SWITCH MP R p 46 Each push calls up a frequency and operating mode in a memo pad The 5 or 10 most recently pro grammed frequencies and operating modes can be recalled starting from the most recent The memo pad capacity can be expanded from 5 to 10 in set mode for your convenience p 59 2 KEYPAD Pushing a key selects the operatin...

Page 10: ...re quency can be changed in 1 Hz steps While the quick tuning step is ON enters the quick tuning step set mode when pushed for 2 sec 1 TRANSMIT FREQUENCY CHECK SWITCH XFC Monitors the transmit frequency when pushed and held when the split frequency function is ON While pushing this switch the transmit frequency can be changed with the tuning dial keypad memo pad or the Y Z switches When the split ...

Page 11: ...us pushing changes the frequency or memory channel number continuously While pushing XFC the transmit readout frequency can be controlled while in spilt frequency operation The UP DN switch can simulate a key paddle Preset in the keyer set mode p 35 w PTT SWITCH Push and hold to transmit release to receive q w q w e r t y u i 4700p 4700p 10µ 0 33µ MICROPHONE MIC ELEMENT 2k 470 DOWN UP PTT RECEIVE ...

Page 12: ...on switches F 1 F 5 y MULTI FUNCTION SCREEN p 10 Shows the screens for the spectrum scope IF filter selection memory channel scan or set modes u MEMORY CHANNEL READOUTS p 41 Show the selected memory channel contents in VFO mode Show the VFO contents in memory mode i FREQUENCY READOUTS p 23 Show the operating frequency Outline characters are used for non accessing readout o CLOCK READOUT p 51 Shows...

Page 13: ...USB USB USB 14 100 00 14 100 00 56 56ß FILTER SCAN MEMORY SET ANT ANT 1 METER METER Po Po P AMP P AMP OFF OFF ATT ATT OFF OFF AGC AGC MID MID VOX VOX OFF OFF COMP COMP OFF OFF SCOPE TX TX 2 4k 2 4k 9 2 8k 2 8k 455 455 12 34 12 34 1ß VFO VFO 14 195 000 VFO VFO USB USB USB USB 14 100 00 14 100 00 14 205 000 14 205 000 USB USB USB USB 14 100 00 14 100 00 56 56ß MARKER MARKER HOLD HOLD MAX H MAX H EXI...

Page 14: ...internal electronic keyer in keyer set mode p 35 NOTE If you use an external electronic keyer make sure the voltage retained by the keyer is less than 0 4 V when the key is ON y CI V REMOTE CONTROL JACK REMOTE p 20 Designed for use with a personal computer for re mote control of transceiver functions Used for transceive operation with another Icom CI V transceiver or receiver u EXTERNAL SPEAKER JA...

Page 15: ...ut current Tx Less than 200 mA Connected in parallel with ACC 2 pin 3 4 MOD Modulator input Connects to a modulator Input impedance 10 kΩ Input level Approx 100 mV rms 5 AF AF detector output Fixed regardless of AF position Output impedance 4 7 kΩ Output level 100 to 300 mV rms 6 SQLS Squelch output Goes to ground when squelch opens Squelch open Less than 0 3 V 5 mA Squelch closed More than 6 0 V ...

Page 16: ...and sensitivity Se lect antenna s such as a well matched 50 Ω antenna and feedline 1 5 1 of Voltage Standing Wave Ratio VSWR is recommended for a desired band Of course the transmission line should be a coaxial cable When using 1 antenna use the ANT1 connector CAUTION Protect your transceiver from lightning by using a lightning arrestor 13 2 INSTALLATION AND CONNECTIONS PL 259 CONNECTOR INSTALLATI...

Page 17: ... 5 18 6 21 7 24 5 8 28 9 GENE 50 0 F INP ENT MW M CL TS XFC HF 50MHz TRANSCEIVER i756 CW KEY A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode p 35 MICROPHONES p 68 SM 20 HM 36 GROUND p 13 Use the heaviest gauge wire or strap available and make the connection as short as possible Grounding prevents electrical shocks TVI and other problems ANTENNA 1 2 p 1...

Page 18: ...P W MP R DUAL WATCH VFO MEMO MAIN SUB CHANGE 1 8 1 3 5 2 7 3 10 4 14 5 18 6 21 7 24 5 8 28 9 GENE 50 0 F INP ENT MW M CL TS XFC HF 50MHz TRANSCEIVER i756 HEADPHONES MIC The AFSK modulation signal can be input from MIC p 19 ANTENNA 1 2 pgs 17 18 Connects a linear amplifier antenna selector etc EXTERNAL SPEAKER p 68 ACC SOCKETS p 12 RX ANTENNA SP 20 AH 3 p 18 AH 2b REMOTE pgs 20 60 Used for computer...

Page 19: ... AC outlet AC cable 20 A fuses Supplied DC power cable 13 8 V 20 A Black _ Red Transceiver CONNECTING A VEHICLE BATTERY 12 V battery Supplied DC power cable red black Crimp Solder Grommet CAUTION Before connecting the DC power cable check the following important items Make sure The POWER switch is OFF Output voltage of the power source is 12 15 V when you use a non Icom power supply DC power cable...

Page 20: ...NT1 ACC 2 ACC 1 CAUTION Set the transceiver output power for 80 W max with the RF POWER control otherwise a protection cir cuit will activate CONNECTING THE IC 4KL CONNECTING THE IC 2KL CONNECTING A NON ICOM POWER AMPLIFIER 50 Ω coaxial cable NON ICOM LINEAR AMPLIFIER To an antenna Transceiver ANT1 RF OUTPUT ALC SEND RF INPUT ALC SEND RWARNING Set the transceiver output power and linear amplifier ...

Page 21: ... cable CONNECTING THE IC AT500 THROUGH THE IC 2KL Transceiver Ground Coaxial cable supplied with the IC 2KL ACC cable supplied with the IC 2KL ACC cable supplied with the IC AT500 IC 2KL To the IC 2KLPS IC AT500 OPC 118 sold separately To an antenna ANT GND ANT1 ACC 1 ACC 2 Coaxial cable supplied with the IC AT500 NOTE The AH 3 can be used for the HF bands only although the ANT1 connector is used ...

Page 22: ... PTT SQUELCH input Connect the SQUELCH line when required Terminal Node Controller TNC or Scan converter ACC 1 socket Rear panel view 1 2 3 4 5 6 7 8 AF input Ground GND AFSK output PTT SQUELCH input Connect the SQUELCH line when required Terminal Node Controller TNC or Scan converter MIC connector Front panel view 1 2 3 4 5 6 7 8 When connected to the MIC connector MIC GAIN and AF control adjustm...

Page 23: ... controls the following func tions of the transceiver Up to four Icom CI V transceivers or receivers can be connected to a personal computer equipped with an RS 232C port See p 60 for setting the CI V condition using set mode Data format The CI V system can be operated using the following data formats Data formats differ according to com mand numbers A data area or sub command is added for some co...

Page 24: ...ver set controls and switches as shown in the figure below POWER M CL F INP Under cooler temperatures the LCD may appear dark and unstable after turning power ON This is normal and does not indicate any equipment mal function METER Po ANT 1 ATT OFF PRE OFF TWIN PBT Center APF AUTO NOTCH OFF LOCK OFF AGC MID POWER OFF TUNER MONITOR NB NR OFF AF Max CCW RF SQL 11 o clock RF POWER Max CW MIC GAIN 10 ...

Page 25: ...y and oper ating mode like a VFO Even if the frequency or mode is changed the memory channel does not memorize the new frequency or operating mode When the memory channel is selected from another memory channel or VFO mode the memorized fre quency and operating mode appear EXAMPLE 14 100 00 USB USB USB USB 21 025 00 21 025 00 1 Changed frequency 14 123 MHz appears VFO VFO TX ANT ANT 1 METER METER ...

Page 26: ... ANT 1 METER METER Po Po 2 4k 9 2 8k 455 12 34 NOTE If the dial lock function is activated the lock indicator lights and the tuning dial does not function In this case push LOCK to deactivate the lock function The transceiver has a keypad for direct frequency entry as described below q Push F INP appears w Input the desired frequency Input decimal point between the MHz units and kHz units e Push F...

Page 27: ...RTTY only While operating in RTTY the 1 4 function is available for critical tuning Dial rotation is reduced to 1 4 of nor mal when the 1 4 function is in use Push 1 4 to toggle the 1 4 function ON and OFF 1 4 1 4 OFF OFF 1 4 1 4 ON ON 1 4 tuning step OFF 1 4 tuning step ON SELECTING THE 1 Hz STEP The minimum tuning step of 1 Hz can be used for fine tuning q Turn OFF the quick tuning step does not...

Page 28: ...6 SSB LSB USB CW CW R CW reverse RTTY RTTY R RTTY reverse AM FM and FM T FM with subaudible tone Narrow modes of each of these are also available To select a mode of operation push the desired mode switch momentarily Push the switch again to toggle between normal and narrow mode Push the switch for 2 sec to toggle between USB and LSB CW and CW R RTTY and RTTY R FM and FM T if neces sary See the di...

Page 29: ... sepa rated from the noise q Push the NR switch to turn the noise reduction ON NR indicator lights w Rotate the NR control to adjust the noise reduc tion level e Push the NR switch to turn the noise reduction OFF NR indicator does not light Deep rotation of the NR control results in audio signal masking or distortion Set the NR control for maximum readability The noise reduction func tion is not a...

Page 30: ... APF 160 160 APF APF 180 80 APF APF 320 320 APF APF CW reverse mode CW R CW Reverse mode receives CW signals with a reverse side CW carrier point like that of LSB and USB modes Use when interfering signals are near a desired signal and you want to change the interference tone Push CW for 2 sec once or twice to select CW or CW R mode Check the interfering tone Receive audio tone response 27 4 RECEI...

Page 31: ...2 and SSB narrow mode Filter selection 28 4 RECEIVE AND TRANSMIT 1ß 15k NONE FILTER SELECTION FILTER SELECTION 9MHz 9MHz 455kHz 455kHz DEF DEF EXIT EXIT AGC AGC MID MID VOX VOX OFF OFF COMP COMP OFF OFF SSB 2 4K 15k 9k NONE 2 8K 1ß 14 195 00 VFO VFO USB USB USB USB 14 100 00 14 100 00 14 205 00 USB USB USB USB 14 100 00 14 100 00 ANT ANT 1 METER METER Po Po P AMP P AMP OFF OFF ATT ATT OFF OFF TX 2...

Page 32: ...RIT RIT NOTE When RIT and TX are ON at the same time the RIT TX control shifts both the transmit and receive frequencies from the displayed frequency at the same time 29 4 RECEIVE AND TRANSMIT RIT and TX 1 14 195 00 1 25 USB USB 14 100 00 14 100 00 ANT ANT 1 METER METER Po Po P AMP P AMP OFF OFF RIT 2 4k 2 4k 9 2 8k 2 8k 455 455 12 34 12 34 VFO VFO USB USB TX RIT appears RIT TX Low shift High shif...

Page 33: ...sec The main and sub readout frequencies are equalized and the dualwatch function is turned ON y Push F 4 SCAN to select the scan screen If the start up screen is not selected if F 5 s function is EXIT push F 5 one or more times to exit u Push F 1 PROG or F 2 F to start the pro grammed scan or F scan respectively Scan activates on the main readout between the pro grammed scan edges or within the F...

Page 34: ...nction is convenient for tuning the transmit frequency while monitoring both frequencies used for transmitting and receiving SPLIT LOCK FUNCTION Accidentally releasing the XFC switch while rotating the tuning dial changes the receive frequency To pre vent this use both the split lock and dial lock functions to change the transmit frequency only The split lock function cancels the dial lock functio...

Page 35: ... 1ß 21 290 00 21 290 00 VFO VFO USB USB USB USB 14 100 00 14 100 00 21 290 00 USB USB USB USB 14 100 00 14 100 00 ANT ANT 1 METER METER Po Po P AMP P AMP OFF OFF ATT ATT OFF OFF 2 4k 2 4k 9 2 8k 2 8k 455 455 SPLIT SPLIT TX 1ß VFO VFO 1ß 21 290 00 21 290 00 VFO VFO USB USB USB USB 14 100 00 14 100 00 21 310 00 USB USB USB USB 14 100 00 14 100 00 ANT ANT 1 METER METER Po Po P AMP P AMP OFF OFF ATT A...

Page 36: ...tion ON or OFF Adjusting the VOX function q Select a phone mode SSB AM FM w Push VOX to turn VOX function ON e Push VOX for 2 sec to enter VOX set mode r Select the VOX gain item using F 1 or F 2 t While speaking into the microphone rotate the tun ing dial to the point where the transceiver is con tinuously transmitting y Adjust the VOX delay for a convenient interval be fore returning to receive ...

Page 37: ...torted Speech compressor The SWR meter indicates the SWR over the trans mission line in all modes q Push TUNER to turn the antenna tuner OFF w Push METER to select the Po meter e Push RTTY to select RTTY mode r Push TRANSMIT t Rotate RF POWER clockwise past the 12 o clock position for more than 30 W output power 30 y Set transmit meter to the SWR meter u Read the SWR on the SWR meter The built in ...

Page 38: ... up down keys in all modes 2 Push F 5 EXIT to exit keyer set mode Electronic CW keyer KEYING WEIGHT EXAMPLE morse code K DASH Weight setting 1 1 3 default Weight setting Adjusted DASH DOT Fixed Adjustable range SPACE Fixed SPACE and DOT length can be adjusted with KEY SPEED only DEF DEF BK IN BK IN OFF OFF AGC AGC MID MID CW CW KEYER KEYER SETTING SETTING EXIT EXIT Repeat time 2sec 1 1 3 0 NORMAL ...

Page 39: ...rom one of the memory keyer channels The morse cut numbers can be used as the contact numbers The maximum number for contact numbers is 9999 q Push CW to select CW mode w Push KEYER to select keyer set mode e Push F 3 001 to enter contact number screen r Rotate the tuning dial to select the cut number type if desired NORMAL does not use morse cut numbers 190 ANO sets 1 as A 9 as N and Ø as O 190 A...

Page 40: ...5k SPLIT SPLIT TX SUB MARK Appears when the marker is out of range Sub readout or TX marker Appears when the marker is out of range The transceiver covers 0 1 60 MHz over 10 bands Each band key has a band memory which can mem orize a selected antenna ANT1 ANT2 ANT1 RX antenna and ANT2 RX antenna When you change the operating frequency beyond a band the previously used antenna is automatically sele...

Page 41: ...ase PTT to receive i To return to simplex push SPLIT momentarily to clear the sub display TX TX Repeater operation 1ß 29 680 00 29 680 00 VFO VFO USB USB FM T FM T 14 100 00 14 100 00 29 580 00 USB USB FM T FM T 14 100 00 14 100 00 VFO VFO ANT ANT 1 METER METER Po Po P AMP P AMP OFF OFF ATT ATT OFF OFF 2 4k 2 4k 9 2 8k 2 8k 455 455 12 34 12 34 SPLIT SPLIT TX 1ß Tone encoder is auto matically turne...

Page 42: ... MANUAL TUNING During SSB operation at low voice levels the internal tuner may not be tuned correctly In such cases man ual tuning is helpful Push TUNER for 2 sec to start manual tuning A side tone is emitted and TUNER blinks while tuning If the tuner cannot reduce the SWR to less than 1 5 1 after 20 sec of tuning the TUNER switch indicator goes out Push TUNER for 2 sec NOTES If the tuner cannot t...

Page 43: ... AH 3 operation Tuning is required for each frequency Be sure to re tune the antenna before transmitting when you change the frequency even slightly q Set the desired frequency in an HF band The AH 3 will not operate on frequencies outside of ham bands w Push TUNER for 2 sec The TUNER light blinks while tuning e The TUNER light lights constantly when tuning is complete When the connected wire cann...

Page 44: ...MO again Using the keypad q Push F INP w Push the desired memory channel number using the keypad Enter 100 or 101 to select scan edge channel P1 or P2 respectively e Push Y or Z to select the desired memory channel Memory channel selection VFO VFO 14 100 00 CW CW USB USB 14 195 00 14 195 00 TX ANT ANT 1 METER METER Po Po 2 4k 2 4k 9 2 8k 2 8k 455 455 12 34 12 34 1 VFO VFO 24 960 00 CW CW USB USB 1...

Page 45: ...esired memory channel e Push F 3 SELECT to set the memory channel as a select memory or not r Repeat steps w to e to program another memory channel as a select memory channel if desired t Push F 5 EXIT to exit the memory channel screen NOTE Setting select memory channels is also possible in the scan screen MEMORY MEMORY EXIT EXIT 2 4k 2 4k 9 2 8k 2 8k 455 455 12 34 12 34 1ß 14 195 00 VFO VFO USB U...

Page 46: ... LSB LSB 7 088 00 7 088 00 TX ANT ANT 1 METER METER Po Po 2 4k 2 4k 9 2 8k 2 8k 455 455 12 34 12 34 MW or Push for 2 sec Beep Beep Beep Programming in memory mode q Select the desired memory channel with Y Z in memory mode Memory channel contents appear in the memory chan nel readout below the frequency readout appears if the selected memory channel is a blank channel and does not have contents w ...

Page 47: ...0 VFO VFO CW CW TX ANT ANT 1 METER METER Po Po 2 4k 2 4k 9 2 8k 2 8k 455 455 12 34 12 34 or Push for 2 sec Beep Beep Beep VFO MEMO Transferring in memory mode This is useful for transferring frequency and operating mode while operating in memory mode NOTE When you have changed the frequency or operating mode in the selected memory channel Displayed frequency and mode are transferred Programmed fre...

Page 48: ...14 100 00 14 100 00 14 205 00 14 205 00 USB USB USB USB TX VFO VFO 98 99 P1 0 500 00 LSB SCAN EDGE P2 29 999 99 USB SCAN EDGE 1ß 14 100 00 USB 4 5 2 3 SET SET NAME NAME SELECT SELECT VOX VOX OFF OFF COMP COMP OFF OFF ROLL ROLL ANT ANT 1 METER METER Po Po P AMP P AMP OFF OFF ATT ATT OFF OFF AGC AGC MID MID Ç Ç SPACE SPACE DEL DEL Å Å UVWXY UVWXY Z MEMORY MEMORY NAME NAME EXIT EXIT ABCDE ABCDE FGHIJ...

Page 49: ... The oldest written frequency and mode are erased Oldest MP W 21 288 22 USB 21 276 00 USB 21 024 52 USB 21 018 06 USB 14 182 40 USB 14 195 00 USB MEMO PADS Calling up a frequency from a memo pad You can simply call up the desired frequency and op erating mode of a memo pad by pushing MP R one or more times Both VFO and memory modes can be used The frequency and operating mode are called up startin...

Page 50: ...MORY SCAN Repeatedly scans all select memory channels F SCAN Repeatedly scans within F span area This scan operates in memory mode This scan operates in memory mode This scan operates in both VFO and memory modes Scan Scan edge P1 or P2 Scan edge P2 or P1 Jump Mch 1 Mch 5 Mch 2 Mch 3 Mch 4 Mch 6 Mch 7 Mch 99 MEMORY SCAN Repeatedly scans all programmed memory channels Mch 1 Mch 5 Mch 2 Mch 3 Mch 4 ...

Page 51: ...M SCAN 1ß 14 195 00 VFO VFO USB USB USB USB 14 100 00 14 100 00 1ß 14 100 00 14 100 00 14 205 00 14 205 00 USB USB USB USB TX VFO VFO q If the start up screen is not selected if F 5 s func tion is EXIT push F 5 one or more times to exit w Select VFO mode or a memory channel e Select the desired operating mode The operating mode can also be changed while scan ning r Push F 4 SCAN to select the scan...

Page 52: ...00 14 100 00 14 205 00 14 205 00 USB USB USB USB TX VFO VFO q If the start up screen is not selected if F 5 s func tion is EXIT push F 5 one or more times to exit w Select memory mode e Select the desired operating mode The operating mode can also be changed while scan ning r Push F 4 SCAN to select the scan screen t Set RF SQL open or closed See p 47 for scan condition If the RF SQL control funct...

Page 53: ... EXIT EXIT VOX VOX OFF OFF COMP COMP OFF OFF ANT ANT 1 METER METER Po Po P AMP P AMP OFF OFF ATT ATT OFF OFF AGC AGC MID MID SELECT MEMORY SCAN 14 195 00 USB USB USB USB 14 100 00 14 100 00 1ß 14 100 00 14 100 00 14 205 00 14 205 00 USB USB USB USB TX VFO VFO VFO VFO 12 12 q If the start up screen is not selected if F 5 s func tion is EXIT push F 5 one or more times to exit w Select memory mode e ...

Page 54: ...ER Po Po P AMP P AMP OFF OFF ATT ATT OFF OFF AGC AGC MID MID 2 4k 2 4k 9 2 8k 2 8k 455 455 15 24 15 24 EXIT EXIT 0 00 60min Power ON timer set Power OFF period 15 24 Time now Set time appears 1ß VFO VFO SET SET VOX VOX ON ON COMP COMP OFF OFF AGC AGC MID MID TIMER SET TIMER SET EXIT EXIT 0 00 60min Power ON timer set Power OFF period TIME set push SET 15 24 Time now 1ß 14 195 00 VFO VFO USB USB US...

Page 55: ... TIMER SET VOX VOX ON ON COMP COMP OFF OFF AGC AGC MID MID EXIT EXIT 19 30 60min Power ON timer set Power OFF period 12 34 Time now TIMER SET TIMER SET SET SET VOX VOX ON ON COMP COMP OFF OFF AGC AGC MID MID EXIT EXIT 19 30 45min Power ON timer set Power OFF period 12 34 Time now TIMER set push SET q Preset the power on time and power off period as described previously w Push POWER momentarily to ...

Page 56: ...MODE MODE DISP DISP OTHERS OTHERS TIME TIME EXIT EXIT LEVEL LEVEL TIMER SET TIMER SET VOX VOX ON ON COMP COMP OFF OFF AGC AGC MID MID EXIT EXIT 0 00 60min Power ON timer set Power OFF period 12 34 Time now DEF DEF VOX VOX OFF OFF COMP COMP OFF OFF AGC AGC MID MID LEVEL SET LEVEL SET EXIT EXIT TX tone Bass 0dB 0dB 50 TX tone Treble Beep Monitor 50 DEF DEF VOX VOX OFF OFF COMP COMP OFF OFF AGC AGC M...

Page 57: ...it until the LCD becomes stable 10 min or more after turning power ON This is an inherent characteristic of LCDs and LCD backlights and does not indicate a transceiver malfunction 50 50 default Backlight LCD This item adjusts the brightness of the LCD from 0 to 100 in 1 steps 50 50 default Backlight switches This item adjusts the brightness of the switches from 1 to 8 8 Backlight level is 8 Maximu...

Page 58: ...nd NONE are se lectable See p 28 for details Calibration marker This item is used for a simple frequency check of the transceiver See p 65 for calibration procedure Turn the calibration marker OFF after checking the frequency of the transceiver Miscellaneous others set mode ON OFF Calibration marker ON Calibration marker OFF default NONE FL 223 FL 100 No optional 9 MHz filter is installed default ...

Page 59: ...er stopping on a signal or 2 sec after a signal disappears OFF scan does not resume after stopping on a signal See p 47 for scanning details ON OFF Scan resume ON default Scan resume OFF RF SQL control The RF SQL control can be set as the RF squelch control default the RF gain control only squelch is fixed as open or squelch control RF gain is fixed at maximum See p 2 for details RF SQL RF SQL RF ...

Page 60: ...eater There are 50 tones available from 67 0 Hz to 254 1 Hz see table at right Available subaudible tones Unit Hz 88 5Hz 254 1Hz 88 5 Hz subaudible tone default 254 1 Hz subaudible tone Split lock When this item is ON the tuning dial can be used to adjust the transmit frequency while pushing XFC even while the lock function is activated See p 31 for split frequency operation details ON OFF Split l...

Page 61: ... selected in this case AUTO MANUAL OFF Antenna switch is activated and the selection is automatically memorized default Antenna switch is activated Antenna switch is deactivated and ANT1 is always selected RTTY mark freq This item selects the RTTY mark frequency RTTY mark frequency is toggled between 1275 1615 and 2125 Hz Miscellaneous others set mode continued 2125 1275 2125 Hz RTTY mark frequenc...

Page 62: ...0 memo pads can be set 5 10 5 memo pads default 10 memo pads Mic up down speed This item sets the rate at which frequencies are scanned when the microphone UP DN switches are pushed and held High or low can be selected HIGH LOW High speed default 50 tuning steps sec Low speed 25 tuning steps sec Speech synthesizer When the optional UT 102 VOICE SYNTHESIZER UNIT is installed you can select between ...

Page 63: ...th the IC 735 OFF ON 5 bytes of frequency data default 4 bytes of frequency data Miscellaneous others set mode continued CI V baud rate This item sets the data transfer rate 300 1200 4800 9600 19200 bps and AUTO are available When AUTO is selected the baud rate is automati cally set according to the connected controller or re mote controller AUTO 19200 Auto baud rate default 19200 bps CI V address...

Page 64: ...rs to their original positions U T 1 0 2 UT 102 J801 UT 102 VOICE SYNTHESIZER UNIT q Remove 2 screws from the left side of the trans ceiver to remove the carrying handle as shown below w Remove 7 screws from the top of the transceiver and 4 screws from the sides then lift up the top cover e Turn the transceiver upside down r Remove 6 screws from the bottom of the trans ceiver then lift up the bott...

Page 65: ...ers NOTE After filter installation specify the installed filter using set mode p 55 Otherwise the in stalled filter will not function properly 9 MHz optional filter 455 kHz optional filter Optional IF filters By installing the CR 502 the total frequency stability of the transceiver will be improved q Remove the top and bottom covers as shown on the opposite page w Turn the transceiver upside down ...

Page 66: ...nter position Push NB to turn the function OFF Push P AMP once or twice to turn the function OFF Set the NR control for maximum readability p 25 p 25 p 26 p 3 p 26 The ANT switch does not function The antenna switch has not been activated Set the antenna switch in set mode to AUTO or MANUAL p 58 SCAN Programmed scan does not stop Squelch is open RF SQL is assigned to RF gain control and squelch is...

Page 67: ...en changing a fuse The IC 756 has 2 types of fuses installed for trans ceiver protection DC power cable fuses FGB 20 A Circuitry fuse FGB 5 A DC POWER CABLE FUSE REPLACEMENT Circuitry fuse FGB 5 A 20A fuse The transceiver has a lithium backup battery on the inside of the front panel for clock and timer functions The usual life of the backup battery is approximately 5 years When the backup battery ...

Page 68: ...operating frequency for 9 999 00 MHz Other standard frequencies can also be used e If the start up screen is not selected if F 5 s func tion is EXIT push F 5 one or more times to exit r Push F 5 SET to select the set mode screen t Push F 4 OTHERS to enter miscellaneous oth ers set mode y Push F 1 Y several times to select the Calibra tion marker item u Rotate the tuning dial clockwise to turn the ...

Page 69: ...p view RF unit R572 Optional voice synthesizer level adj Space for optional 455 kHz filter PLL unit Space for optional 9 MHz filter Space for optional voice synthesizer UT 102 MAIN unit Space for optional high stability crystal unit CR 502 Reference freq check point cable from J81 60 000 MHz Bottom view ...

Page 70: ...and 55 dB suppression TX variable range 9 999 kHz Microphone connector 8 pin connector 600 Ω ELEC KEY connector 3 conductor 6 35 d mm 1 4 KEY connector 3 conductor 6 35 d mm 1 4 SEND connector Phono RCA ALC connector Phono RCA Receiver Intermediate frequencies Sensitivity SSB CW RTTY 0 16 µV 1 80 29 99 MHz 1 10 dB S N 0 13 µV 50 0 54 0 MHz 2 AM 13 µV 0 5 1 799 MHz 10 dB S N 2 µV 1 80 29 99 MHz 1 F...

Page 71: ...FILTERS FL 52A 500 Hz 6 dB CW nar FL 53A 250 Hz 6 dB CW nar FL 222 1 8 kHz 6 dB SSB nar FL 257 3 3 kHz 6 dB SSB wide IC 2KL HF 500 W LINEAR AMPLIFIER All solid state 500 W linear amplifier The power amplifier unit can be separately set up from the power supply unit IC AT500 HF AUTOMATIC ANTENNA TUNER 500 W automatic antenna tuner Includes an automatic antenna selector for 4 separate antennas SM 8 ...

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Icom IC-756, Instruction Manual

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