Icom IC-746PRO Manual Download Page 57

Page: 57 / 164

Tuning Knob

• The transceiver has several tuning methods for convenient frequency

tuning.

• When rotating the tuning dial rapidly, the tuning step

automatically

changes several times as selected.

• The operating frequency can be changed in kHz

steps

(0.1, 1, 5, 9, 10,

12.5, 20 or 25 kHz selectable) for quick tuning.

• The minimum tuning step of 1 Hz can be used for fine tuning.

• If the dial lock function is activated, the lock indicator lights, and the tuning

dial does not function. In this case, push [LOCK/SPCH] to deactivate the lock
function.

Summary of Contents for IC-746PRO

Page 1: ... the IC 746PRO Use your mouse to navigate through the presentation by clicking the desired control or function To start this tour click either the Front Panel or Rear Panel view Use the arrow button at the bottom of each page to return to the previous slide ...

Page 2: ...Front Panel Rear Panel ...

Page 3: ...Rear Panel Front Panel ...

Page 4: ...POWER Connector Accepts 13 8 V DC through the supplied DC power cable OPC 025D ...

Page 5: ...TX Indicator Lights red while transmitting ...

Page 6: ...RX Indicator Lights green while receiving a signal and when the squelch is open ...

Page 7: ...ctivated The dial lock function prevents accidental changes caused by the tuning dial Push LOCK SPCH to turn the dial lock function ON and OFF LOCK indicator lights while the dial lock function is activated Lights while the dial lock function is activated ...

Page 8: ...ration Split frequency operation allows you to transmit and receive in the same mode on two different frequencies The split frequency operation is basically performed using 2 frequencies in VFO A and VFO B SPLIT Lights during split operation ...

Page 9: ...ansceiver has a keypad for direct frequency Push F INP F INP indicator lights Input the desired frequency Input decimal point between the MHz units and kHz units Push 144 ENT to enter the input frequency To cancel the input push A B instead of 144 ENT Lights when keypad input is activated ...

Page 10: ...POWER Switch Push momentarily to turn power ON Turn the optional DC power supply ON in advance Push for 1 sec to turn power OFF ...

Page 11: ...AH 4 Connector Connection for the AH 4 Automatic Antenna Tuner ...

Page 12: ...ACC Connectors Connectors used for Accessories ...

Page 13: ...iver through the GROUND terminal on the rear panel For best results connect a heavy gauge wire or strap to a long earth sunk copper rod Make the distance between the GND terminal and ground as short as possible WARNING NEVER connect the GND terminal to a gas or electric pipe since the connection could cause an explosion or electric shock ...

Page 14: ...V LEVEL CONVERTER to a personal computer equipped with an RS 232C port The Icom Communications Interface V CI V controls the following functions of the transceiver Up to 4 Icom CI V transceivers or transceivers can be connected to a personal computer equipped with an RS 232C port ...

Page 15: ...External Speaker Jack for an External speaker 2 conductor 3 5 d mm 8W More than 2 0 W at 10 distortion with an 8Ω load ...

Page 16: ...SEND Connector Goes to ground while transmitting to control external equipment such as a linear amplifier Max control level 16 V DC 0 5 A ...

Page 17: ...com linear amplifier WARNING Set the transceiver output power and linear amplifier ALC output level referring to the linear amplifier instruction manual The ALC input level must be in the range 0 V to 4 V and the transceiver does not accept positive voltage ...

Page 18: ...Key Jack Rear Jack to be used for Keying via a Straight Key or Computer ...

Page 19: ...Data Connector Data connection for Packet operation ...

Page 20: ...s the transmit frequency when pushed and held While pushing this switch the transmit frequency can be changed with the tuning dial keypad or memo pad When the split lock function is turned ON pushing XFC cancels the dial lock function ...

Page 21: ...shing the same key 2 or 3 times calls up other stacked frequencies in the band ICOM s triple band stacking register memorizes 3 frequencies in each band After pushing F INP enters a keyed frequency Pushing 144 ENT is necessary at the end e g to enter 14 195 MHz push F INP 1 4 1 9 5 144 ENT ...

Page 22: ... select another frequency and operating mode This frequency and operating mode are memorized in the second band stacking register Push 14 5 again then select another frequency and operating mode This frequency and operating mode are memorized in the third band stacking register When a fourth frequency and operating mode are selected on a band the first register is repeated ...

Page 23: ...Triple Band Stacking Register The transceiver has a triple band stacking register This means that the last 3 operating frequencies and modes used on a particular band are automatically memorized ...

Page 24: ...out frequency and operating mode into a memo pad The 5 most recent entries remain in memo pads The transmit frequency is programmed when pushed together with XFC The memo pad capacity can be expanded from 5 to 10 in set mode for your convenience ...

Page 25: ...requency and operating mode in a memo pad The 5 or 10 most recently programmed 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 ...

Page 26: ...A B Push to toggle between VFO A and VFO B Push for 1 sec to equalize the frequency and operating mode of the two VFO s ...

Page 27: ...he split function ON and OFF when pushed Turns the quick split function ON when pushed for 1 sec The offset frequency is shifted from the displayed frequency The quick split function can be turned OFF using set mode ...

Page 28: ...Frequency Input Push to toggle keypad input between frequency and band The frequency input indicator lights during frequency input is selected for the keypad ...

Page 29: ...M CH Knob Selects a memory channel Rotate clockwise to increase the memory channel rotate counterclockwise to decrease the memory channel ...

Page 30: ...V M Switches the selected readout operating mode between the VFO mode and memory mode when pushed Transfers the memory contents to VFO when pushed for 1 sec ...

Page 31: ...Memory Write Stores the selected readout frequency and operating mode into the displayed memory channel when pushed for 1 sec This function is available both in VFO and memory modes ...

Page 32: ...y channels plus 1 call channel The memory mode is very useful for quickly changing to often used frequencies All 101 memory channels are tunable which means the programmed frequency can be tuned temporarily with the tuning dial etc in memory mode ...

Page 33: ...ars the selected readout memory channel contents when pushed for 1 sec in memory mode The channel becomes a blank channel Any unnecessary memory channels can be cleared This switch does not function in VFO mode ...

Page 34: ...PBTC Clears the Twin PBT settings when pushed for 1 sec ...

Page 35: ...ses the DSP circuit for the PBT function Moving both TWIN PBT controls to the same position shifts the IF The LCD shows the passband width and shift frequency graphically Push FILTER for 1 sec to enter the filter set mode Current passband width and shift frequency is displayed in the filter set mode screen To set the TWIN PBT controls to the center positions push PBTC for 1 sec Advanced Twin PBT O...

Page 36: ...d best when there is no interference When PBT is used the audio tone may be changed Variable range is set to half of the IF filter passband width 25 Hz steps and 50 Hz steps are available These controls function as an IF shift control while in AM mode and when the RTTY filter is turned ON Only the inner control may function in this case Graphics of these controls function as an IF shift control ...

Page 37: ...Advanced Twin PBT Graphs ...

Page 38: ...LCD Shows the operating frequency function switch menus band scope screen memory name screen set mode settings etc Click on display for more details ...

Page 39: ...LCD Breakdown ...

Page 40: ...Frequency Readout Show the operating frequency Showing MHz KHz and depending on the Quick Tuning Step Setting 1 Hz resolution ...

Page 41: ...RIT Readout Shows the RIT or TX frequency offset ...

Page 42: ...VFO Readout Indicates whether VFO A or VFO B is selected ...

Page 43: ...A B Push A B to switch between the VFO A and VFO B VFO A or VFO B appears Use two VFOs as a quick memory When you find a new station but you wish to continue searching the Two VFO system can be used for quick memory storage VFO equalization Push A B for 1 sec to equalize the undisplayed VFO condition to the displayed VFO 3 beeps sound when the VFO equalization is completed ...

Page 44: ...Memory Channel Readout Appears when the selected memory channel is set as a select memory channel Also indicates when the memory channel is blank ...

Page 45: ...RIT Readout Shows the RIT or TX frequency offset ...

Page 46: ...Antenna Readout Display outlines the antenna being used Mode and Voice Scanning Conditions ...

Page 47: ...Tune Indicators TUNE appears when the antenna tuner is ON TUNE appears and flashes during manual tuning EXT appears when the optional AH 4 external antenna tuner is connected to ANT1 ...

Page 48: ...damaged NEVER operate the AH 4 when it is not grounded Transmitting before tuning may damage the transceiver Note that the AH 4 cannot tune when using a 1 2 l long wire or multiple of the operating frequency When connecting the AH 4 the antenna connector assignments are ANT2 for the internal tuner and ANT1 for the AH 4 The antenna indicator in the LCD displays EXT when the AH 4 is connected and se...

Page 49: ... damaged NEVER operate the AH 4 when it is not grounded Transmitting before tuning may damage the transceiver Note that the AH 4 cannot tune when using a 1 2 l long wire or multiple of the operating frequency When connecting the AH 4 the antenna connector assignments are ANT2 for the internal tuner and ANT1 for the AH 4 The antenna indicator in the LCD displays EXT when the AH 4 is connected and s...

Page 50: ...AH 4 Antenna Tuner Installation ...

Page 51: ... 144 MHz band a total of 3 antenna connectors Antenna Selections For each operating band the IC 746PRO covers there is a band memory which can memorize a selected antenna When you change the operating frequency beyond a band the previously used antenna is automatically selected see below for the new band This function is convenient when you use 2 antennas for HF and 50 MHz bands operation ...

Page 52: ...sired mode switch momentarily Push the switch again to toggle between USB and LSB CW CW R and RTTY RTTYR AM and FM if necessary Push the switch for 1 sec to toggle between CW and CW R RTTY and RTTY R or to select data mode if necessary D appears when SSB data AM data or FM data mode is selected ...

Page 53: ...Multi Function Display Indicates the functions assigned to the multi function switches F1 F5 Toggles between menu 1 M1 and menu 2 M2 ...

Page 54: ...Multi Function Meter Indicator Shows receiving signal strength etc during receive Shows transmit output power ALC and SWR during transmit ...

Page 55: ...Common Functions Shows the status of commonly used functions ...

Page 56: ...As with memory channels the call channel can also hold split frequencies By default 145 00000 MHz FM is programmed into the call channel IMPORTANT When the call channel is selected with the CALL switch the frequency CANNOT be changed using the tuning dial band keys or keypad input However when the call channel is selected using M CH in memory mode the frequency CAN be changed ...

Page 57: ...es several times as selected The operating frequency can be changed in kHz steps 0 1 1 5 9 10 12 5 20 or 25 kHz selectable for quick tuning The minimum tuning step of 1 Hz can be used for fine tuning If the dial lock function is activated the lock indicator lights and the tuning dial does not function In this case push LOCK SPCH to deactivate the lock function ...

Page 58: ...lly changes several times as selected There are 2 type of auto tuning steps HIGH Fastest and LOW Faster HIGH Auto tuning step is turned ON Approx 5 times fastest tuning step during rapid rotation default LOW Auto tuning step is turned ON Approx 2 times faster tuning step during rapid rotation OFF Auto tuning step is turned OFF ...

Page 59: ...ammed kHz steps 0 1 1 5 9 10 12 5 20 and 25 kHz quick tuning steps are available While the quick tuning step is OFF turns the 1 Hz step ON and OFF when pushed for 1 sec 1 Hz indication appears in and the frequency can be changed in 1 Hz steps While the quick tuning step is ON enters the quick tuning step set mode when pushed for 1 sec ...

Page 60: ...Lock Push momentarily to toggle the dial lock function ON and OFF Pushing for 1 sec announces the selected readout frequency and S meter indication when an optional UT 102 is installed ...

Page 61: ...T 102 announces the accessed readout s frequency mode etc S meter level can also be announced in a clear electronically generated voice in English or Japanese Push LOCK SPCH for 1 sec to announce the frequency etc ...

Page 62: ...to suit your preference The brake adjustment screw is located on the right side of the tuning dial Turn the brake adjustment screw clockwise or counterclockwise to obtain a comfortable tension level while turning the dial continuously and evenly in one direction ...

Page 63: ...ng the transmit frequency while the RIT function is ON Rotate the control clockwise to increase the frequency or rotate the control counterclockwise to decrease the frequency The shift frequency range is 9 99 kHz in 10 Hz steps or 9 999 kHz in 1 Hz steps ...

Page 64: ...ing the receive frequency while the TX function is ON Rotate the control clockwise to increase the frequency or rotate the control counterclockwise to decrease the frequency The shift frequency range is 9 99 kHz in 10 Hz steps or 9 999 kHz in 1 Hz steps ...

Page 65: ... Tuning shifts the receive frequency without shifting the transmit frequency This is useful for fine tuning stations calling you on an off frequency or when you prefer to listen to slightly different sounding voice characteristics etc ...

Page 66: ... TX The TX shifts the transmit frequency without shifting the receive frequency This is useful for simple split frequency operation in CW etc ...

Page 67: ... clear the RIT TX shift frequency Quick RIT Clear this item selects the RIT TX frequency clearing ON Clears the RIT TX frequency when CLEAR is pushed momentarily OFF Clears the RIT TX frequency when CLEAR is pushed for 1 sec default ...

Page 68: ...r function ON and OFF What is the preamp The preamp amplifies received signals in the front end circuit to improve the S N ratio and sensitivity Select P AMP1 or P AMP2 when receiving weak signals 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 broadcasting sta...

Page 69: ... as that generated by automobile ignition systems This function cannot be used for FM or non pulse type noise NB appears while the noise blanker is activated Enters the noise blanker level set mode when pushed for 1 sec When using the noise blanker received signals may be distorted if they are excessively strong ...

Page 70: ...h as that generated by automobile ignition systems This function cannot be used for FM or non pulse type noise NB appears while the noise blanker is activated Enters the noise blanker level set mode when pushed for 1 sec When using the noise blanker received signals may be distorted if they are excessively strong ...

Page 71: ...OX function ON and OFF Push for 1 sec to enter VOX set mode What is the VOX function The VOX function voice operated transmission starts transmission without pushing the transmit switch or PTT switch when you speak into the microphone then automatically returns to receive when you stop speaking ...

Page 72: ...semi break in full break in or break in OFF Push for 1 sec to enter Break in set mode mode What is the break in function The break in function switches transmit and receive with CW keying Full break in QSK can monitor the receive signal during keying ...

Page 73: ... semi break in full break in or break in OFF Push for 1 sec to enter Break in set mode mode What is the break in function The break in function switches transmit and receive with CW keying Full break in QSK can monitor the receive signal during keying ...

Page 74: ...VOX function ON and OFF Push for 1 sec to enter VOX set mode What is the VOX function The VOX function voice operated transmission starts transmission without pushing the transmit switch or PTT switch when you speak into the microphone then automatically returns to receive when you stop speaking ...

Page 75: ... VOX to keep the rig keyed Anti VOX Sets the VOX so sounds in the shack do not trigger the VOX VOX Delay Sets the interval before returning to receive BREAK IN Set Mode Sets the break in delay time the delay from transmit to receive For both Full and Semi Break in setting ...

Page 76: ...monitor your transmit IF signals in any mode through the speaker Use this to check voice characteristics while adjusting SSB transmit tones The CW sidetone functions when MONITOR is OFF in CW mode Enters to monitor set mode when pushed for 1 sec ...

Page 77: ... monitor your transmit IF signals in any mode through the speaker Use this to check voice characteristics while adjusting SSB transmit tones The CW sidetone functions when MONITOR is OFF in CW mode Enters to monitor set mode when pushed for 1 sec ...

Page 78: ...MONITOR Set Mode Enters to monitor set mode when pushed for 1 sec ...

Page 79: ...TRANSMIT SWITCH Selects transmitting or receiving The TX indicator lights red while transmitting and the RX indicator lights green when the squelch is open ...

Page 80: ...HEADPHONE JACK Accepts headphones 1 4 mono type jack Output power 5 mW with an 8 Ω load When headphones are connected the internal speaker or connected external speaker does not function ...

Page 81: ...on Selection between the internal electronic keyer bug key and straight key operation can be made in keyer set mode A straight key jack is separately available on the rear panel Keyer polarity dot and dash can be reversed in keyer set mode 4 channel memory keyer is available for your convenience ...

Page 82: ...MICROPHONE CONNECTOR Accepts the supplied or optional microphone ...

Page 83: ...AF RF SQUELCH CONTROL Concentric control for the AF Control and RF Squelch ...

Page 84: ...AF CONTROL Inner control varies the audio output level from the speaker or Headphone outputs ...

Page 85: ...signal is received The squelch is particularly effective for FM It is also available for other modes 12 to 1 o clock position is recommended for any setting of the RF SQL control The control can be set as Auto RF gain control in SSB CW and RTTY squelch control in AM and FM or squelch control RF gain is fixed at maximum in set mode as follows ...

Page 86: ...e input gain The transmit audio tone in SSB AM and FM modes can be adjusted in tone control set mode How to set the microphone gain Set the MIC control so that the ALC meter sometimes swings during normal voice transmission in SSB mode ...

Page 87: ...RF POWER CONTROL Continuously varies the RF output power from minimum less than 5 W to maximum 100 W AM mode less than 5 W to 40 W ...

Page 88: ...CW PITCH CONTROL Shifts the received CW audio pitch and monitored CW audio pitch without changing the operating frequency The pitch can be changed from 300 to 900 Hz in approx 25 Hz steps ...

Page 89: ...ELECTRONIC CW KEYER SPEED Adjusts the internal electronic CW keyer s speed 6 wpm min to 60 wpm max can be set ...

Page 90: ...nd Automatic Notch when pushed What is the notch function The notch function eliminates unwanted CW or AM carrier tones while preserving the desired signal s audio response The filtering frequency is adjusted to effectively eliminate unwanted tones via the DSP circuit ...

Page 91: ...and Automatic Notch when pushed What is the notch function The notch function eliminates unwanted CW or AM carrier tones while preserving the desired signal s audio response The filtering frequency is adjusted to effectively eliminate unwanted tones via the DSP circuit ...

Page 92: ...O NOTCH The auto notch function automatically attenuates more than 3 beat tones tuning signals etc even if they are moving ANOTCH appears when auto notch is in use NOTCH appears when manual notch is in use ...

Page 93: ...NR NOTCH CONTROL Concentric control for the Noise Reduction and Manual Notch features ...

Page 94: ...ch function The notch function eliminates unwanted CW or AM carrier tones while preserving the desired signal s audio response The filtering frequency is adjusted to effectively eliminate unwanted tones via the DSP circuit ...

Page 95: ...ce signal by varying the peak frequency of the manual notch filter to pick out a receive signal from interference while the manual notch function is ON Notch filter center frequency SSB 0 Hz to 5100 Hz CW 900 Hz CW pitch freq to 4200 Hz CW pitch freq AM 5100 Hz to 5100 Hz ...

Page 96: ...NOISE REDUCTION Switches the noise reduction ON and OFF NR appears while the noise reduction is activated Used in conjunction with the Noise Reduction control ...

Page 97: ...NOISE REDUCTION 1 Switches the noise reduction ON and OFF NR appears while the noise reduction is activated Used in conjunction with the Noise Reduction control ...

Page 98: ...ved signals are converted to digital signals and then the desired signals are separated from the noise Push the NR switch to turn the noise reduction ON NR appears Rotate the NR control to adjust the noise reduction level Push the NR switch to turn the noise reduction OFF NR disappears NOTE Deep rotation of the NR control results in audio signal masking or distortion Set the NR control for maximum...

Page 99: ...1 antenna connector for the 144 MHz band a total of 3 antenna connectors For each operating band the IC 746PRO covers there is a band memory which can memorize a selected antenna When you change the operating frequency beyond a band the previously used antenna is automatically selected Convenient when you use 2 antennas for HF and 50 MHz bands operation Antenna Suggestions ...

Page 100: ...antenna automatically Once the tuner matches an antenna the variable capacitor angles are memorized as a preset point for each frequency range 100 kHz steps Therefore when you change the frequency range the variable capacitors are automatically preset to the memorized point CAUTION NEVER transmit with the tuner ON when no antenna is connected This will damage the transceiver Be careful of the ante...

Page 101: ... Push to select the function indicated in the LCD display above these switches Functions vary depending on the operating condition Push to input a character for memory keyer programming or memory name M2 Multi Function Buttons ...

Page 102: ...1 Push to select the function indicated in the LCD display above these switches Functions vary depending on the operating condition Push to input a character for memory keyer programming or memory name M2 Multi Function Buttons ...

Page 103: ...for the control of Scanning Memory Channels SWR Scope and Tone Control SCN Selects the scan menu MEM Selects the memory name screen SWR Selects the SWR graph screen TCN Selects the audio tone set mode VSC Enables the VSC Voice Scan Control function ...

Page 104: ... for the control of Scanning Memory Channels SWR Scope and Tone Control SCN Selects the scan menu MEM Selects the memory name screen SWR Selects the SWR graph screen TCN Selects the audio tone set mode VSC Enables the VSC Voice Scan Control function ...

Page 105: ... selection of the type of scanning and the settings for control of the scanning function of the IC 746PRO is found under the SCN Menu Scan speed and the scan resume condition can be set using the scan set mode ...

Page 106: ...acters each Like DX spot into memory channel 10 Push F1 several 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 characters _ are available Use the keypad to directly input numerals 0 to 9 including a decimal point ...

Page 107: ...l equipment or special adjustments are necessary The IC 746PRO can measure SWR in 2 ways spot measurement and plot measurement are available Spot Measurement gives the operator the SWR for the given operating frequency Plot measurement allows you to measure the SWR over an entire band ...

Page 108: ...of the transmit audio tone from 5 dB to 5 dB in 1 dB steps TX Treble This item adjusts the treble level of the transmit audio tone from 5 dB to 5 dB in 1 dB steps RX Bass This item adjusts the bass level of the receive audio tone from 5 dB to 5 dB in 1 dB steps RX Treble This item adjusts the treble level of the receive audio tone from 5 dB to 5 dB in 1 dB steps ...

Page 109: ... memory channels P1 and P2 The default frequencies for these memories are 0 500000 MHz and 29 99999 MHz respectively If the same frequencies are programmed into the scan edge memory channel P1 and P2 programmed scan does not start Memory Scan is selected from this menu when in Memory Mode ...

Page 110: ...Fine Programmed Scan Similar to a programmed scan except when a signal is received Temporarily the scan continues as the tuning step set to 10 Hz ...

Page 111: ...ith the displayed VFO or memory channel frequency as for center frequency The frequency range is specified by the span Set the F span 5 kHz 10 kHz 20 kHz 50 kHz 100 kHz 500 kHz and 1 MHz are selectable As with the programmed scan the F scan also has a fine scan setting ...

Page 112: ...Fine F Scan During F scan when a signal is received scan continues but the tuning step is temporarily set to 10 Hz ...

Page 113: ...arches through memory channel 1 to 99 for signals Blank un programmed memory channels are skipped Select Memory Scan searches through memory channel set as select for signals See below for setting and deleting select memory channels ...

Page 114: ...Fine Scanning There are two types of Fine Scanning Fine Program Scan Fine DF Scan ...

Page 115: ...Select Memory Scanning Select memory scan searches through memory channel set as select for signals ...

Page 116: ...SPAN Sets the F span by pushing 5 kHz 10 kHz 20 kHz 50 kHz 100 kHz 500 kHz and 1 MHz are selectable ...

Page 117: ...s until it is stopped manually it does not pause on detected signals When squelch is closed scan stops when detecting a signal then resumes according to the scan resume condition Scan speed and the scan resume condition can be set using the scan set mode ...

Page 118: ...Scan Speed Rotate the tuning dial to select scan speed from high and low HIGH scan is faster LOW scan is slower ...

Page 119: ...Scan Resume ON when detecting a signal scan pauses for 10 sec then resumes When a signal disappears scan resumes 2 sec later OFF when detecting a signal cancels scanning ...

Page 120: ...ion is activated the receiver checks received signals for voice components If a receiver signal includes voice components and the tone of the voice components changes within 1 sec scan pauses or stops If the received signal includes no voice components or the tone of the voice components does not change within 1 sec scan resumes ...

Page 121: ...ICOM Smart Menu system adjusts to the mode you are operating For SSB Operation these are the following functions AGC Automatic Gain Control DUP Duplex Operation CMP RF Speech Compression TBW Transmit Band Width SCP RX Band Scope ...

Page 122: ...width for SSB mode can be selected from wide middle and narrow Push for 1 sec to select the transmission passband width One of TX BW WIDE TX BW MID or TX BW NAR is displayed for approx 1 sec Transmit filter width NAR 2 0 kHz MID 2 6 kHz WIDE 2 9 kHz ...

Page 123: ...produce a constant audio output level even when the received signal strength is varied by fading etc Select FAST for tuning and select MID or SLOW depending on the receiving condition Push momentarily to change the time constant of the AGC Push for 1 sec to enter to the AGC set mode ...

Page 124: ... produce a constant audio output level even when the received signal strength is varied by fading etc Select FAST for tuning and select MID or SLOW depending on the receiving condition Push momentarily to change the time constant of the AGC Push for 1 sec to enter to the AGC set mode ...

Page 125: ...nd 1 kHz can be selected When the RTTY filter is turned ON the RTTY tuning meter can be used RTTY Decoder The transceiver has an RTTY decoder for Baudot mark freq 2125 Hz shift freq 170 Hz 45 bps An external terminal unit TU or terminal node connector TNC is not necessary for receiving a Baudot signal RTTY Set Mode used to set the mark and shift frequencies keying type decode USOS function etc ...

Page 126: ...RTTY Map The transceiver has a number of convenient functions for the RTTY operation that can be accessed from the RTTY menu ...

Page 127: ...dth can be selected from 1 kHz 500 Hz 350 Hz 300 Hz and 250 Hz When the RTTY filter is turned ON the RTTY tuning meter can be used Moreover the twin peak filter changes the receive frequency response by boosting 2 particular frequencies 2125 and 2295 Hz for better copying of desired RTTY signals ...

Page 128: ... Decoder The transceiver has an RTTY decoder for Baudot mark freq 2125 Hz shift freq 170 Hz 45 bps An external terminal unit TU or terminal node controller TNC is not necessary for receiving a Baudot signal ...

Page 129: ...electable RTTY Keying Selects the keying polarity from normal and reverse NORMAL Key open close Mark Space REVERSE Key open close Space Mark Decode USOS Turn the USOS UnShift On Space function ON OFF ON Decode as letter code OFF Decode as character code Decode New Line Selects the new line code of the internal RTTY decoder CR Carriage Return LF Line Feed CR LF CR LF CR LF and CR LF CR LF CR LF onl...

Page 130: ...ressor is ON Push for 1 sec to enter to the compression set mode What is the speech compressor The speech compressor compresses the transmitter audio input to increase the average audio output level Therefore talk power is increased This function is effective for long distance communication or when propagation conditions are poor ...

Page 131: ...pressor is ON Push for 1 sec to enter to the compression set mode What is the speech compressor The speech compressor compresses the transmitter audio input to increase the average audio output level Therefore talk power is increased This function is effective for long distance communication or when propagation conditions are poor ...

Page 132: ... Mode To set up the RF Speech compression speak normally into the microphone Rotating the tuning dial so the COMP meter reads within the COMP zone When meter peaks above the COMP zone your transmitted audio may be distorted ...

Page 133: ...Duplex Push momentarily to selects the duplex direction or turn the function OFF DUP or DUP indicator appears during duplex operation Push for 1 sec to turn the one touch repeater function ON OFF ...

Page 134: ... repeater operation with push of one switch To set the transceiver for repeater operation using the one touch repeater function follow the steps push for 1 sec NOTE Set the offset shift direction and frequency in advance as well as the tone frequency ...

Page 135: ...d signal strength is varied by fading etc The transceiver has 3 AGC characteristics time constant fast mid slow for non FM mode The FM mode AGC time constant is fixed as FAST 0 1 sec and AGC time constant cannot be selected AGC OFF appears when AGC time constant OFF is set with one of FAST MID or SLOW setting in AGC set mode ...

Page 136: ...ve to the S meter level S1 to S9 with each vertical dot in the band scope indicator equal to one segment of the S meter Signal activity is measured 30 steps from the center frequency with each step equal to the selected sweep step Frequency indicator mark After a sweep indicates the relative position of the selected frequency When the selected frequency is outside of the sweep range indicator flas...

Page 137: ...Band Scope View ...

Page 138: ... Function Buttons ICOM Smart Menu system adjusts to the mode you are operating For SSB Operation these are the following functions AGC Automatic Gain Control DUP Duplex Operation Turn tuning control SCP RX Band Scope ...

Page 139: ... Turn Tuning Control While operating in SSB data CW RTTY the function is available for critical tuning Dial rotation is reduced to of normal when the function is in use ...

Page 140: ...ttons ICOM Smart Menu system adjusts to the mode you are operating For SSB Operation these are the following functions AGC Automatic Gain Control DUP Duplex Operation Turn tuning control KEY Key functions SCP RX Band Scope ...

Page 141: ...Memory Keyer Function The transceiver has a number of convenient functions for the electronic keyer that can be accessed from the memory keyer menu Push to select the memory keyer or keyer send menu ...

Page 142: ...Memory Keyer Function Map ...

Page 143: ... function keys F1 to F4 to send the contents of the memory keyer Pushing a function key for 1 sec repeatedly sends the contents push any function key to cancel the transmission The contest number counter above F5 is incremented each time the contents are sent Push F5 to reduce the contact number count by 1 when resending contents to unanswered calls ...

Page 144: ...memory keyer memories can be set using the memory keyer edit menu The memory keyer can memorize and re transmit 4 CW key codes for often used CW sentences contact numbers etc Total capacity of the memory keyer is 50 characters per memory channel ...

Page 145: ...rse cut number default 190 ANO Sets 1 as A 9 as N and 0 as O 190 ANT Sets 1 as A 9 as N and 0 as T 90 NO Sets 9 as N and 0 as O 90 NT Sets 9 as N and 0 as T 2 Count Up Trig This item sets the count up trigger channel M1 M2 M3 and M4 can be set 3 Present Number This item shows the current number for the count up trigger channel set above Rotate the tuning dial to change the number or push for 1 sec...

Page 146: ... sets the CW side tone level limit When the AF control is rotated above a specified level the CW side tone does not increase ON CW side tone level is limited default OFF CW side tone level is not limited 3 Repeat Time When sending CW using the repeat timer this item sets the time between transmission 1 to 60 sec in 1 sec step can be selected 4 Dot Dash Ratio This item sets the dot dash ratio 1 1 2...

Page 147: ...larity can be selected 3 Keyer Type This item selects the keyer type for ELEC KEY connector on the front panel ELEC KEY BUG KEY and Straight key can be selected 4 Mic U D Keyer This item allow you to set the microphone UP DN keys to be used as a paddle ON UP DN switches can be used for CW OFF UP DN switches cannot be used for CW NOTE When ON is selected the frequency and memory channel cannot be c...

Page 148: ...ons ICOM Smart Menu system adjusts to the mode you are operating For SSB Operation these are the following functions AGC Automatic Gain Control DUP Duplex Operation Turn tuning control RTY Transmit Band Width SCP RX Band Scope ...

Page 149: ...ion Buttons ICOM Smart Menu system adjusts to the mode you are operating For SSB Operation these are the following functions AGC Automatic Gain Control DUP Duplex Operation CMP RF Speech Compression SCP RX Band Scope ...

Page 150: ...ICOM Smart Menu system adjusts to the mode you are operating For SSB Operation these are the following functions AGC Automatic Gain Control DUP Duplex Operation CMP RF Speech Compression TON Tones CTCSS or DTCS SCP RX Band Scope ...

Page 151: ...quelch or CTCSS operation is a method of communications using selective calling Only received signal having a matching tone will open the squelch DTCS function is an another method of communications using selective calling Only received signal having a matching 3 digit code will open the squelch ...

Page 152: ...CTCSS Tone squelch or CTCSS operation is a method of communications using selective calling Only received signal having a matching tone will open the squelch Also has decode scan capability ...

Page 153: ...CTCSS 1 Tone squelch or CTCSS operation is a method of communications using selective calling Only received signal having a matching tone will open the squelch Also has decode scan capability ...

Page 154: ...en matched tone or code is found the scan pauses and the tone frequency or code is set for the selected tone as in step When the tone scan or DTCS code scan is operated in memory or call channel the detected tone frequency or code can be used for temporarily To keep the detected tone frequency or code setting for memory contents you must over written the memory or call channel ...

Page 155: ...DTCS DTCS function is an another method of communications using selective calling Only received signal having a matching 3 digit code will open the squelch Also has decode scan capability ...

Page 156: ...DTCS 1 DTCS function is an another method of communications using selective calling Only received signal having a matching 3 digit code will open the squelch Also has decode scan capability ...

Page 157: ...Menu Push to change the set of functions assigned to the multi function switches Toggles between menu 1 M1 and menu 2 M2 ...

Page 158: ...SSB Selects USB and LSB mode alternately Selects SSB data mode USB D LSB D when pushed for 1 sec in SSB mode ...

Page 159: ...CW RTTY Selects CW and RTTY mode alternately in CW mode switches CW and CW R CW reverse mode when pushed for 1 sec In RTTY mode switches RTTY and RTTY R RTTY reverse mode when pushed for 1 sec ...

Page 160: ...AM FM Selects AM and FM mode alternately Selects AM FM data mode AM D FM D when pushed for 1 sec AM FM mode ...

Page 161: ... of 41 passband widths are available For RTTY mode the passband width can be set within 50 to 2700 Hz in 50 or 100 Hz steps A total of 32 passband widths are available For AM and FM modes the passband width is fixed and 3 passband widths are available independently The filter selection is automatically memorized in each mode The PBT shift frequencies are automatically memorized in each filter ...

Page 162: ...l of 41 passband widths are available For RTTY mode the passband width can be set within 50 to 2700 Hz in 50 or 100 Hz steps A total of 32 passband widths are available For AM and FM modes the passband width is fixed and 3 passband widths are available independently The filter selection is automatically memorized in each mode The PBT shift frequencies are automatically memorized in each filter ...

Page 163: ...ps In RTTY mode the passband width can be set within the following range 50 to 500 Hz 50 Hz steps 600 to 2700 Hz 100 Hz steps Push F 3 for 1 sec to select the default value The PBT shift frequencies are cleared when the passband width is changed This filter set mode screen graphically displays the PBT shift frequencies and CW pitch operations ...

Page 164: ... the antenna is automatically selected whenever that band is accessed Antenna select function Manual When Manual is selected you can use the ANT1 and ANT2 however band memory does not function Antenna select function OFF In this case only ANT1 and the 144 MHz antenna connector can be used ANT switch does not function ...

Search results

Summary of Contents for IC-746PRO

Reviews:

Related manuals for IC-746PRO

Brands by name

Popular brands

Icom IC-746PRO, Manual

Search results

Summary of Contents for IC-746PRO

Reviews:

Related manuals for IC-746PRO

Brands by name

Popular brands