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Icom i746PRO Instruction Manual

Manual is about: HF/VHF ALL MODE TRANSCEIVER

Summary of i746PRO

  • Page 1

    2001 new hf/vhf all mode transceiver i746pro instruction manual 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 interfe...

  • Page 2

    I 2001 new 2001 new foreword we understand that you have a choice of many differ- ent radios in the market place. We want to take a cou- ple of moments of your time to thank you for making the ic-746pro your radio of choice, and hope you agree with icom’s philosophy of “technology first”.Many hours ...

  • Page 3: Table of Contents

    Ii supplied accessories the transceiver comes with the following accessories. Qty. Q dc power cable (opc-025d) ............................ 1 w hand microphone (hm-36) ................................ 1 e spare fuses (fgb 30 a) .................................... 2 r spare fuse (fgb 5 a) .............

  • Page 4: Quick Reference Guide

    I quick reference guide 2001 new ■ installation 1. Install a ground system for dc noise suppression and rfi suppression 2. Install your dc power supply 3. Install lightning protection. This will help protect more than your gear. 4. Install and connect an antenna system for the ap- propriate bands of...

  • Page 5

    Ii quick reference guide 3. Installing lightning protection although you may not live in an area with high occur- rence for lightning storms, it is always wise to take precautions for lightning or static discharges. Proper lightning protection not only offers protection to the ham gear, but the shac...

  • Page 6: ■ Operation

    Iii quick reference guide 2001 new 2001 new 5. Connect other peripheral equipment everyone has his or her favorite ad-on gear; now is the time to connect this gear! We will cover the basic devices that can be connected to your ic-746pro. If you do not see the particular item you are wanting to conne...

  • Page 7: ■ Your First Contact

    Iv quick reference guide 2001 new 3. Other convenient items headphones: a 6.35(d) mm ( 1 ⁄ 4 ″) mono jack for operation without using the internal or external speakers. Perfect for op- eration without disturbing others in the room. External speaker: a 3.5(d) mm ( 1 ⁄ 8 ″) mono jack for operation wit...

  • Page 8

    V quick reference guide 2001 new 2001 new d d just listening 3. Verify proper antenna has been selected. 1. Select the desired band on your ic-746pro, an easy way of changing bands is by using the keypad located just above the tuning knob on the right hand side of the display. You will no- tice each...

  • Page 9

    Vi quick reference guide 2001 new d d what are you hearing? Stop and focus on what you are hearing. Do you hear a lot of noise? Is the signal intelligible? Are you set up for the right mode? How about the filters? 1. Verify mode your ic-746pro has many features to reduce qrm and qrn from the desired...

  • Page 10

    Vii quick reference guide 2001 new 2001 new c. Notch: there are two notch systems on your ic- 746pro. • automatic: the automatic notch will track up to three heterodynes. This is helpful for eliminating annoying transmitter “tune up” tones on any band, and to min- imize continuous tone “heterodynes”...

  • Page 11

    Viii quick reference guide 2001 new d. Filters:— continued • on the fly adjustment: once the adjustments have been made in the filter set mode, you can make on the fly changes by using the twin pass band tuning, twin pbt. You will be able to see the effects of the twin pbt on the upper left hand sid...

  • Page 12: ■ Ready to Call Cq?

    Ix quick reference guide 2001 new 2001 new once you have mastered your filter settings, one last feature to enable the most intelligible audio is the ac- tual audio tone you hear. You can adjust the equal- ization of your received audio ±5db. Q push [menu] several times, or until m2 is shown on the ...

  • Page 13

    X quick reference guide 2001 new verify you have selected a clear frequency and call out your cq! The capability of changing the pass band of your transmit audio, is at your finger tips. Regardless of the condition of the speech compressor, you can adjust it by selecting the [f4 tbw]. You will find ...

  • Page 14: Panel Description

    1 1 panel description 2001 new ■ front panel q power switch [power] ➥push momentarily to turn power on. • turn the optional dc power supply on in advance. ➥push for 1 sec. To turn power off. W transmit switch [transmit] selects transmitting or receiving. • the [tx] indicator lights red while transmi...

  • Page 15

    2 1 panel description • when functioning as rf gain control (squelch is fixed open; ssb, cw, rtty only) • when functioning as squelch control (rf gain is fixed at maximum.) while rotating the rf gain control, noise may be heard. This comes from the dsp unit and does not indicate an equipment malfunc...

  • Page 16: ■ Front Panel

    3 1 panel description 2001 new 2001 new ■ front panel (continued) !8 multi-function switches [f1]–[f5] ➥push to select the function indicated in the lcd display above these switches. (p. 11) • functions vary depending on the operating mode. ➥push to input a character for memory keyer pro- gramming o...

  • Page 17

    4 1 panel description 2001 new @3 vox/break-in switch [vox/bk-in] ➥in ssb, am and fm modes, push momentarily to turn the vox function on and off (p. 55); push for 1 sec. To enter vox set mode (p. 55). ➥in cw mode, push momentarily to turn the semi break-in, full break-in or break-in off (p. 56); pus...

  • Page 18: ■ Front Panel

    ■ front panel (continued) #8 transmit frequency check switch [xfc] (pgs. 45, 48) monitors 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 [xf...

  • Page 19

    6 1 panel description 2001 new $6 split switch [split] ➥turns the split function on and off when pushed.(p. 59) ➥turns the quick split function on, when pushed for 1 sec. (p. 60) • the offset frequency is shifted from the displayed fre- quency. • the quick split function can be turned off using set ...

  • Page 20: ■ Rear Panel

    ■ rear panel !5 !3 t r !2 !1 !0 o i u y q w e !4 7 1 panel description 2001 new 2001 new q dc power socket [dc 13.8v] (pgs. 14, 16) accepts 13.8 v dc through the supplied dc power cable (opc-025d). W antenna connector [ant 144mhz] e antenna connector 2 [ant2] r antenna connector 1 [ant1] (pgs. 14, 1...

  • Page 21

    8 1 panel description 2001 new d data socket d acc sockets acc (1) pin no. Name description specifications 1 2 3 4 5 6 7 8 “high” level : more than 2.4 v 1 rtty controls rtty keying “low” level : less than 0.6 v output current : less than 2 ma 2 gnd connects to ground. Connected in parallel with acc...

  • Page 22: ■ Lcd Display

    9 1 panel description 2001 new 2001 new ■ lcd display q frequency readouts shows the operating frequency. W multi-function meter indication ➥shows receiving signal strength, etc. During re- ceive. ➥shows transmit output power, alc and swr dur- ing transmit. E vox indicator (p. 55) appears when the v...

  • Page 23: ■ Lcd Display

    10 1 panel description 2001 new ■ lcd display (continued) !5 break-in indicators (p. 56) ➥“fbk-in” appears when the full break-in function is activated. ➥“bk-in” appears when the semi break-in function is activated. !6 monitor indicator (p. 57) appears when the monitor function is activated. !7 prea...

  • Page 24: ■ Multi Function Switches

    11 1 panel description 2001 new 2001 new ■ multi function switches d d m1 functions during ssb operation during ssb data operation during cw operation during rtty operation during am operation during fm operation agc (p. 49) ➥push momentarily to change the time constant of the agc circuit. ➥push for...

  • Page 25: ■ Microphone

    ■ microphone (hm-36) q up/down switches [up]/[dn] change the selected readout frequency or memory channel. • continuous pushing changes the frequency or memory channel number continuously. • while pushing [xfc], the transmit readout frequency can be controlled while in spilt frequency operation. • t...

  • Page 26: ■ Unpacking

    2 13 installation and connections 2001 new ■ unpacking after unpacking, immediately report any damage to the delivering carrier or dealer. Keep the shipping cartons. For a description and a diagram of accessory equip- ment included with the ic-746pro, see ‘supplied ac- cessories’ on p. Ii of this ma...

  • Page 27: ■ Required Connections

    2 14 installation and connections ■ required connections • front panel • rear panel i746pro power f 1 menu ssb f 2 cw/rtty f 3 am/fm f 4 filter f 5 xfc mp-w gene 50 mp-r 0 21 7 24 8 28 9 10 4 14 5 18 6 1.8 1 3.5 2 7 3 144 ent ts a/b split f-inp v/m m-cl pbtc mw twin pbt m-ch lock/ spch ∂tx rit clear...

  • Page 28: ■ Advanced Connections

    ■ advanced connections • front panel • rear panel 15 2 installation and connections 2001 new 2001 new power transmit phones elec-key mic nr a/notch tuner ant hf/vhf transceiver nr notch af mic gain rf pwr cw pitch f 1 f 2 f 3 f 4 f 5 xfc mp-w gene 50 0 21 7 24 8 28 9 14 5 10 4 18 6 3.5 2 1.8 1 7 3 1...

  • Page 29

    16 2 installation and connections 2001 new ■ power supply connections use an optional dc power supply with a 25 a capacity and above when operating the transceiver with ac power. Refer to the diagrams below. Connecting ps-125 dc power supply connecting a dc power supply connecting a vehicle battery ...

  • Page 30

    2001 new 17 2 installation and connections 2001 new ■ linear amplifier connections connecting the ic-pw1 turn off the transceiver’s antenna tuner while tuning the ic-pw1’s tuner. Connecting a non-icom linear amplifier r warning: set the transceiver output power and linear ampli- fier alc output leve...

  • Page 31: Basic Operation

    Before first applying power, make sure all connections required for your system are complete by referring to chapter 2. Then, reset the transceiver using the fol- lowing procedure. Note: when first applying power or when operat- ing in cold environments, the display may flicker or appear faint. This...

  • Page 32

    19 3 basic operation 2001 new 2001 new ■ selecting an operating band 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. See the table below for a list of the bands available and the de...

  • Page 33: ■ Vfo Operation

    20 3 basic operation 2001 new ■ selecting vfo/memory mode vfo is an abbreviation of variable frequency oscilla- tor, and is commonly referred to as a main tuning func- tion. The tuning dial is often called the “vfo knob.” ➥ push [v/m] to switch between vfo and memory modes. • pushing [v/m] for 1 sec...

  • Page 34: ■ Frequency Setting

    21 3 basic operation 2001 new 2001 new ■ frequency setting the transceiver has several tuning methods for conve- nient frequency tuning. D d tuning with the tuning dial q push the desired band key on the keypad 1–3 times. • 3 different frequencies can be selected on each band with the band key. (p. ...

  • Page 35

    22 3 basic operation 2001 new d d selecting the 1 hz step the minimum tuning step of 1 hz can be used for fine tuning. Q push [ts] momentarily to turn the quick tuning step off • “ ▼” disappears. W push [ts] for 1 sec. To toggle the 1 hz tuning step on and off. D d band edge warning beep when select...

  • Page 36: ■ Volume Setting

    23 3 basic operation 2001 new 2001 new ■ operating mode selection ssb (usb/lsb), ssb data (usb data/lsb data), cw, cw reverse (cw-r), rtty, rtty-r (rtty reverse), am, am data, fm and fm data modes are available in the ic-746pro. Select the desired operation mode as follows. To select a mode of opera...

  • Page 37

    3 basic operation 24 2001 new adjusts the rf gain and squelch threshold level. The squelch removes noise output from the speaker (closed position) when no signal is received. • the squelch is particularly effective for fm. It is also avail- able for other modes. • the control can be set as the rf ga...

  • Page 38

    25 3 basic operation 2001 new 2001 new ■ basic transmit operation d d transmitting before transmitting, monitor your selected operating frequency to make sure transmitting won’t cause inter- ference to other stations on the same frequency. Q push [transmit] or [ptt] (microphone) to trans- mit. • the...

  • Page 39: Receive And Transmit

    2001 new 4 26 receive and transmit ■operating ssb q push a band key to select the desired band. W push [ssb] to select lsb or usb. • below 10 mhz lsb is automatically selected; above 10 mhz usb is automatically selected. E rotate [af] to set audio to a comfortable listening level. R rotate the tunin...

  • Page 40: ■Operating Cw

    27 4 receive and transmit 2001 new 2001 new ■operating cw q push a band key to select the desired band. W push [cw/rtty] to select cw. • after cw mode is selected, push [cw/rtty] for 1 sec. To toggle between cw and cw-r modes. E rotate [af] to set audio to a comfortable listening level. R rotate the...

  • Page 41

    28 4 receive and transmit 2001 new d d about cw reverse mode 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. Q push [cw/rtty] several times to...

  • Page 42

    29 4 receive and transmit 2001 new 2001 new ■electronic keyer functions the transceiver has a number of convenient functions for the electronic keyer that can be accessed from the memory keyer menu. Q push [cw/rtty] to select cw mode. W push [menu] to select m1. E push [f4 key] to select the memory ...

  • Page 43

    30 4 receive and transmit 2001 new f 1 f 2 f 3 f 4 f 5 f 2 f 1 f 4 f 3 repeat indicators count up trigger indicator counter m 1 m 2 m 3 m 4 - 1 m 1 m 2 m 3 m 4 - 1 m2 send indication m 1 m 2 m 3 m 4 - 1 c q t e s t c q 0 0 1 c q t e s t c q 0 0 1 q r z ? M 1 m 2 m 3 m 4 - 1 u r 5 n n 0 0 1 b 0 0 1 0...

  • Page 44

    31 4 receive and transmit 2001 new 2001 new d d editing a memory keyer the contents of the 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 k...

  • Page 45

    32 4 receive and transmit 2001 new d d contest number set mode this menu is used to set the contest (serial) number and count up trigger, etc. • setting contents q push [menu] to select m1, then push [f4 key] to select the memory keyer menu. W push [f4 001] to enter the contest number set mode. E pu...

  • Page 46

    33 4 receive and transmit 2001 new 2001 new d d keyer set mode this set mode is used to set the cw side tone, mem- ory keyer repeat time, dash weight, paddle specifica- tions, keyer type, etc. • setting contents q push [menu] to select m1, then push [f4 key] to select the memory keyer menu. W push [...

  • Page 47

    34 4 receive and transmit 2001 new 5. Rise time this item sets the envelop time period which the out- put power becomes the set transmit power. • 2, 4, 6 or 8 msec. Can be selected. 4 m s 5 r i s e t i m e key action tx output power • about rise time tx rx set tx power level time 6. Paddle polarity ...

  • Page 48: ■Operating Rtty (Fsk)

    35 4 receive and transmit 2001 new 2001 new ■operating rtty (fsk) before operating rtty, be sure to consult the manual that comes with your tnc. Q push a band key to select the desired band. W push [cw/rtty] several times to select rtty. • after rtty mode is selected, push [cw/rtty] for 1 sec. To to...

  • Page 49: ■Rtty Functions

    36 4 receive and transmit 2001 new ■rtty functions the transceiver has a number of convenient functions for the rtty operation that can be accessed from the rtty menu. Q push [cw/rtty] to select rtty mode. W push [menu] to select m1. E push [f4 rty] to select the rtty menu. R push one of the multi-f...

  • Page 50

    D d rtty filter/twin peak filter the transceiver has 5 rtty filters in addition to nor- mal if filters. The passband width 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 r...

  • Page 51

    38 4 receive and transmit 2001 new f 1 f 2 f 3 f 4 f 5 f 1 f 2 f 3 f 4 f 5 f 1 f 2 f 3 f 4 f 5 a g c d u p 1 / 4 r t y s c p d e c f i l s e t a d j r t t y - f i l o n push [f4] push [f2] appears while the rtty decoder screen is freezed with [f2] operation. Push [f3] to erase the displayed characte...

  • Page 52

    39 4 receive and transmit 2001 new 2001 new d d rtty set mode this set mode is used to set the mark and shift fre- quencies, keying type, decode usos function, etc. • setting contents q push [menu] to select m1, then push [f4 rty] to select the rtty menu. W push [f5 set] to select rtty set mode. E p...

  • Page 53: ■Operating Am

    40 4 receive and transmit 2001 new ■operating am q push a band key to select the desired band. W push [am/fm] to select am. E rotate [af] to set audio to a comfortable listening level. R rotate the tuning dial to tune a desired signal. • s-meter indicates received signal strength. • the default tuni...

  • Page 54: ■Operating Fm

    41 4 receive and transmit 2001 new 2001 new ■operating fm q push a band key to select the desired band. W push [am/fm] to select fm. E rotate [af] to set audio to a comfortable listening level. R rotate the tuning dial to tune a desired signal. • s-meter indicates received signal strength. T push [t...

  • Page 55

    42 4 receive and transmit 2001 new d d tone squelch operation tone squelch operation is a method of communica- tions using selective calling. Only received signals hav- ing a matching tone will open the squelch. Before communicating using tone squelch, all members of your party must agree on the ton...

  • Page 56

    43 4 receive and transmit 2001 new 2001 new d d dtcs operation dtcs function is an another method of communica- tions using selective calling. Only received signals hav- ing a matching 3-digit code will open the squelch. Q push [am/fm] to select fm mode. W push [menu] several times to select m1. E p...

  • Page 57: ■Repeater Operation

    44 4 receive and transmit 2001 new ■repeater operation a repeater amplifies received signals and retransmits them at a different frequency. When using a repeater, the transmit frequency is shifted from the receive fre- quency by an offset frequency. A repeater can be ac- cessed using split frequency...

  • Page 58

    45 4 receive and transmit 2001 new 2001 new d d transmit frequency monitor check you may be able to receive the other party’s transmit signal directly without having to go through a repeater. This function allows you to check this. ➥while receiving, push and hold [xfc] to see if you can receive the ...

  • Page 59

    46 4 receive and transmit 2001 new d d auto repeater function this function automatically activates the repeater set- tings (dup– or dup+ and/or tone encoder on/off) when the operating frequency falls within the general repeater output frequency range and deactivates them when outside of the range. ...

  • Page 60: Functions For Receive

    5 47 functions for receive 2001 new ■ simple band scope the band scope function allows you to visually check signal conditions around a specified frequency. The ic- 746pro’s band scope function can be used in any op- erating mode and frequency band. The band scope measures receive signal conditions ...

  • Page 61: ■ Preamp/attenuator

    48 5 functions for receive ■ preamp/attenuator the preamp amplifies received signals 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 distor- tion when very strong signals ar...

  • Page 62: ■ Agc Function

    49 5 functions for receive 2001 new 2001 new ■ agc function the agc (auto gain control) controls receiver gain to produce a constant audio output level even when the received signal strength is varied by fading, etc. The transceiver has 3 agc characteristics (time con- stant; fast, mid, slow) for no...

  • Page 63: ■ If Filter Selection

    50 5 functions for receive 2001 new ■ if filter selection the transceiver has 3 passband width if filters for each mode. For ssb and cw modes, the passband width can be set within 50 to 3600 hz in 50 or 100 hz steps. A total of 41 passband widths are available. For rtty mode, the passband width can ...

  • Page 64: ■ If (Dsp) Filter Shape

    51 5 functions for receive 2001 new 2001 new [nb] n b l e v e l 5 o % shows noise blanker level “nb” appears while noise blanker is activated. ■ if (dsp) filter shape the type of if (dsp) filter shape for ssb and cw can be selected independently from soft and sharp. Q push [ssb] or [cw/rtty] to sele...

  • Page 65: ■Twin Pbt Operation

    52 5 functions for receive 2001 new ■twin pbt operation general pbt (passband tuning) function electronically narrows the if passband width by shifting the if fre- quency to slightly outside of the if filter passband to reject interference. This transceiver uses the dsp cir- cuit for the pbt functio...

  • Page 66: ■ Noise Reduction

    53 5 functions for receive 2001 new ■ noise reduction the noise reduction function reduces noise compo- nents and picks out desired signals which are buried in noise. The received signals are converted to digital signals and then the desired signals are separated from the noise. Q push the [nr] swit...

  • Page 67

    54 5 functions for receive ■ voice squelch control function this function is useful when you don’t want unmodu- lated signals. When the voice squelch control function is activated, the receiver checks received signals for voice components. If a receiver signal includes voice components, and the tone...

  • Page 68: Functions For Transmit

    6 55 functions for transmit 2001 new ■ vox function the vox (voice-operated transmission) function switches between transmit and receive with your voice. This function provides an opportunity to input log en- tries into your computer, etc., while operating. • using the vox function q select a phone ...

  • Page 69: ■ Break-In Function

    56 6 functions for transmit ■ break-in function the break-in function is used in cw mode to automat- ically toggle the transceiver between transmit and re- ceive when keying. The ic-746pro is capable for full break-in or semi break-in. D d semi break-in operation during semi break-in operation, the ...

  • Page 70: ∂Tx Function

    57 6 functions for transmit 2001 new 2001 new ■ ∂ ∂tx function the ∂tx function shifts the transmit frequency up to ±9.99 khz in 10 hz steps without moving the receive frequency. • see #2 on p. 4 for function description. Q push the [∂tx] switch to turn the ∂tx function on and off. • “ ∂tx” and shif...

  • Page 71: ■ Speech Compressor

    58 6 functions for transmit 2001 new ■ speech compressor the speech compressor increases average rf output power, improving signal strength and readability in ssb, am or fm. When adjusting the compression level, it is necessary to turn the comp meter on in the set mode, in ad- vance (p. 82). • in ss...

  • Page 72

    59 6 functions for transmit 2001 new 2001 new ■ split frequency operation 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. The following is an examp...

  • Page 73: ■ Quick Split Function

    60 6 functions for transmit 2001 new ■ quick split function when you push the [split] switch for 1 sec., split fre- quency operation is turned on, the undisplayed vfo is automatically changed according to the plus/minus shift frequency programmed in set mode (p. 83) or equalized when 0 khz (default ...

  • Page 74: ■ Measuring Swr

    61 6 functions for transmit 2001 new 2001 new ■ measuring swr the ic-746pro has a built-in circuit for measuring an- tenna swr— no external equipment or special adjust- ments are necessary. The ic-746pro can measure swr in 2 ways— spot measurement and plot measurement are available. D d spot measure...

  • Page 75: Memory Operation

    7 62 memory operation 2001 new ■ memory channels the transceiver has 101 memory channels (plus 1 call channel). The memory mode is very useful for quickly changing to often-used frequencies. All 101 memory channels are tuneable which means the programmed frequency can be tuned temporarily with the t...

  • Page 76: ■ Programming A Memory

    63 7 memory operation 2001 new 2001 new ■ programming a memory memory channel programming can be preformed ei- ther in vfo mode or in memory mode. D d programming in vfo mode q set the desired frequency and operating mode in vfo mode. W rotate [m-ch] to select the desired memory chan- nel. • “blank”...

  • Page 77

    2001 new 64 7 memory operation ■ selecting the call channel by default 145.00000 mhz/fm is programmed into the call channel. However, this can be changed to suit your operating preference. (see below) q push [call] to select the call channel. • “c” appears. W push [call] again to return to the previ...

  • Page 78: ■ Frequency Transferring

    65 7 memory operation 2001 new 2001 new ■ frequency transferring the contents of a memory channel (frequency, oper- ating mode, etc.) can be transferred to the vfo. Frequency transferring can be performed in either vfo mode or memory mode. D d transferring in vfo mode this is useful for transferring...

  • Page 79: ■ Programming Scan Edges

    66 7 memory operation 2001 new ■ programming scan edges memory channels p1 and p2 are the program scan edges. They are used to program an upper and lower frequency for programmed scan (p. 71). By default, p1 is programmed with 0.50000 mhz and p2 is pro- grammed with 29.99999 mhz. If p1 and p2 are pr...

  • Page 80: ■ Assigning Memory Names

    67 7 memory operation 2001 new 2001 new ■ assigning memory names all memory channels (including scan edges) can be tagged with alphanumeric names of up to 9 characters each. [example]: programming “dx spot” into memory channel 99. Q push [v/m] to select memory mode, if necessary. W rotate [m-ch] to ...

  • Page 81: ■ Memo Pads

    68 7 memory operation 2001 new ■ memo pads the transceiver has a memo pad function to store fre- quency and operating mode for easy write and recall. The memo pads are separate from memory channels. The default number of memo pads is 5, however, this can be increased to 10 in set mode if desired. (p...

  • Page 82: Scans

    8 69 scans 2001 new ■ scan types ■ preparation • channels for programmed scan: program scan edge frequencies into scan edge mem- ory channels p1 and p2. For ∂ ∂f scan: set the ∂f span (∂f scan range) in the scan screen. For memory scan: program 2 or more memory channels except scan edge memory chann...

  • Page 83: ■ Scan Set Mode

    70 8 scans ■ voice squelch control function this function is useful when you don’t want unmodu- lated signals pausing or cancelling a scan. When the voice squelch control function is activated, the receiver checks received signals for voice components. If a receiver signal includes voice components,...

  • Page 84

    71 8 scans 2001 new 2001 new ■ programmed scan/fine programmed scan (vfo mode) programmed scan searches for signals between scan edge memory channels p1 and p2. The default fre- quencies for these memories are 0.500000 mhz and 29.99999 mhz, respectively. See p. 66 for scan edges programming. Q push ...

  • Page 85: ■ Select Memory Scan

    72 8 scans 2001 new ■ memory scan operation (memory mode) memory scan searches through memory channel 1 to 99 for signals. Blank (unprogrammed) memory chan- nels are skipped. Q push [v/m] to select memory mode, if necessary. W push [menu] to select m2. E push [f1 scn] to select the scan menu. • see ...

  • Page 86

    73 8 scans 2001 new 2001 new ■ ∂ ∂f scan operation and fine ∂f scan ∂f scan searches for signals within the specified range with the displayed vfo or memory channel fre- quency as for center frequency. The frequency range is specified by the span. Q push [v/m] to select vfo mode or memory mode, as d...

  • Page 87

    74 8 scans 2001 new ■ tone scan/dtcs code scan operation by monitoring a signal that is being operated with a re- peater, tone squelch or dtcs, you can determine the tone frequency necessary to open a repeater or the squelch. Q push [am/fm] to select fm mode. W push [menu] several times to select m1...

  • Page 88: Antenna Tuner Operation

    9 75 antenna tuner operation 2001 new ■ antenna connection and selection the ic-746pro has 2 antenna connectors for the hf/50 mhz bands, [ant1] and [ant2], and 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 mem...

  • Page 89: ■ Antenna Tuner Operation

    76 9 antenna tuner operation ■ antenna tuner operation the internal automatic antenna tuner matches the transceiver to the connected antenna automatically. Once the tuner matches an antenna, the variable ca- pacitor angles are memorized as a preset point for each frequency range (100 khz steps). The...

  • Page 90

    ■ optional external tuner operation d d ah-4 hf/50 mhz automatic antenna tuner the ah-4 matches the ic-746pro to a long wire an- tenna more than 7 m/23 ft long (3.5 mhz and above). • see the ah-4 instruction manual for ah-4 installation and antenna connection details. Never operate the ah-4 without ...

  • Page 91: Data Communication

    10 78 data communication 2001 new ■connections ■ when connecting to [data] • when using a pc application • when using a tnc q data in w gnd r data out (9600 bps) y p sql* t af out (1200 bps) e ptt p tx audio gnd rx audio sql ptt q data in w gnd r data out (9600 bps) y p sql* t af out (1200 bps) e pt...

  • Page 92: ■Packet (Afsk) Operation

    79 2001 new 2001 new 10 data communication ■packet (afsk) operation before operating packet (afsk) be sure to consult the operating manual that came with your tnc. Q connect a tnc and pc. (p. 78) w push a band key to select an operating band. E push [ssb] or [am/fm] to select the desired operat- ing...

  • Page 93: ■Data Transmission Speed

    2001 new 80 10 data communication ■adjusting the tnc output level when setting data transmission speed to 9600 bps, the data signal coming from the tnc is applied exclu- sively to the internal limiter circuitry to automatically maintain band width. Never apply data levels from the tnc of over 0.6 v ...

  • Page 94: Set Mode

    11 81 set mode 2001 new 2. Lcd backlight this item adjusts the brightness of the lcd from 0% to 100% in 1% steps. (default: 50%) l c d b a c k l i g h t 5 o % 2 ■ general set mode d d entering set mode set mode is used for programming infrequently changed values or conditions of functions. • set mod...

  • Page 95

    82 11 set mode 6. Beep a beep sounds each time a switch is pushed to con- firm it. This function can be turned off for silent op- eration. On confirmation beep on (default) off confirmation beep off the volume level can be set in 3. Beep level. (p. 81) b e e p 6 o n 7. Band edge beep a beep sounds w...

  • Page 96

    83 11 set mode 2001 new 2001 new 11. Quick split when this item is set to on, pushing [split] for 1 sec. Sets the transmit frequency using the displayed frequency and the split offset, set in split off- set item below, and activates the split function au- tomatically. On quick split on (default) off...

  • Page 97

    2001 new 84 11 set mode 17. One touch rptr this item turns the one touch repeater function on (dup- or dup+) and off. When [f2 dup] is pushed for 1 sec. In m1, the se- lected offset direction and the programmed duplex offset frequency (depending on the operating fre- quency band) is set with the dis...

  • Page 98

    85 11 set mode 2001 new 2001 new 22. [ant] switch you can set the antenna connector selection to auto- matic, manual or non-selection (when using 1 an- tenna only for the hf/50 mhz bands). Auto : the antenna switch is activated and the band memory memorizes the se- lected antenna. (default) manual: ...

  • Page 99

    86 11 set mode 2001 new 27. Dial auto ts this item sets the auto tuning step function. When ro- tating the tuning dial rapidly, the tuning step automat- ically changes several times as selected. There are 2 type of auto tuning steps: high (fastest) and low (faster). High : auto tuning step is turned...

  • Page 100

    87 11 set mode 2001 new 2001 new 32. Ssb/cw synchronous tuning this item selects the displayed frequency shift func- tion from on and off. When this function is activated, the receiving signal can be kept in receive even when the operating mode is changed between ssb and cw. On : the displayed frequ...

  • Page 101

    88 11 set mode 2001 new 38. Ci-v transceive transceive operation is possible with the ic-746pro connected to other icom hf transceivers or receivers. On : transceive on (default) off : transceive off when “on” is selected, changing the frequency, op- erating mode, etc. On the ic-746pro automatically...

  • Page 102: ■ Tone Control Set Mode

    89 11 set mode 2001 new 2001 new ■ tone control set mode d d entering tone control set mode tone levels (bass and treble) for each transmit and re- ceive audio can be set for each phone mode indepen- dently. • set mode operation q push [menu] several times to select m2. W push [f4 tcn] to select the...

  • Page 103: Option Installation

    12 90 option installation 2001 new ■ opening the transceiver’s case follow the case and cover opening procedures shown here when you want to install an optional unit or adjust the internal units, etc. Caution: disconnect the dc power cable from the transceiver before performing any work on the trans...

  • Page 104: ■ Cr-338

    91 12 option installation 2001 new 2001 new ■ cr-338 high stability crystal unit by installing the cr-338, the total frequency stability of the transceiver will be improved. Q remove the bottom covers as shown on the previ- ous page. W remove the 4 screws from the shield cover of the rf unit, and di...

  • Page 105: Maintenance

    2001 new 13 92 maintenance scan ■ troubleshooting the following chart is designed to help you correct problems which are not equipment malfunctions. If you are unable to locate the cause of a problem or solve it through the use of this chart, contact your near- est icom dealer or service center. Pro...

  • Page 106: ■ Fuse Replacement

    93 13 maintenance 2001 new 2001 new ■ fuse replacement if a fuse blows or the transceiver stops functioning, try to find the source of the problem, and replace the dam- aged fuse with a new, rated fuse. The ic-746pro has 2 types of fuses installed for transceiver protection. • dc power cable fuses ....

  • Page 107: ■ Resetting The Cpu

    2001 new ■ resetting the cpu when first applying power or when the function does not seem to be operating normally, reset the cpu as follows: q make sure the transceiver power is off. W while pushing [m-cl] and [f-inp], push [power] for 1 sec. To turn power on. • the internal cpu is reset. • the tra...

  • Page 108: Control Command

    14 95 control command 2001 new • ci-v connection example the transceiver can be connected through an optional ct-17 ci-v level converter to a personal computer equipped with an rs-232c port. The icom communi- cations interface-v (ci-v) controls the following func- tions of the transceiver. Up to 4 i...

  • Page 109

    96 14 control command • command table (continued) command sub command description 0e a1–a7 set ∂f scan span (a1=±5 khz, a2=±10 khz, a3=±20 khz, a4=±50 khz, a5=±100 khz, a6=±500 khz, a7=±1 mhz) b0 set as non-select channel b1 set as select channel d0 set scan resume off d3 set scan resume on 0f 00 tu...

  • Page 110

    97 14 control command 2001 new 2001 new • command table (continued) command sub command description 1a 0548 send/read fm tx tone (treble) level (0=–5 to 10=+5) 0549 send/read fm rx tone (bass) level (0 =–5 to 10=+5) 0550 send/read fm rx tone (treble) level (0=–5 to 10=+5) 0551 send/read contact numb...

  • Page 111

    98 14 control command 2001 new • command table (continued) d d to send/read memory contents when sending or reading memory contents, additional code as follows must be added to appoint the memory channel. ➥additional code: 0000–0102 (0100=p1, 0101=p2, 0102=call) d d band stacking register to send or...

  • Page 112

    D d split/duplex frequency setting the following data sequence is used when sending/reading the split or duplex frequency setting. D d repeater tone/tone squelch frequency setting the following data sequence is used when sending/reading the dtcs code and polarity setting. D d dtcs code and polarity ...

  • Page 113: Specifications

    15 100 specifications 2001 new • general • frequency coverage : (unit: mhz) receive 0.030– 60.000000* 108.000– 174.000000* transmit 1.800– 2.000000 3.500– 3.999999 7.000– 7.300000 10.100– 10.150000 14.000– 14.350000 18.068– 18.168000 21.000– 21.450000 24.890– 24.990000 28.000– 29.700000 50.000– 54.0...

  • Page 114: Options

    16 101 options 2001 new ic-pw1 hf/50 mhz all band 1 kw linear amplifier full-duty 1 kw linear amplifier including an automatic antenna tuner. Has automatic tuning and band selection capability. Full break-in (qsk) oper- ation is possible. The amplifier/power supply unit and the remote control unit a...

  • Page 115

    2001 new ic-746pro.Qxd 02.4.2 11:32 page 102.

  • Page 116

    1-1-32 kamiminami, hirano-ku, osaka 547-0003 japan a-6085h-1us-w printed in japan © 2001, 2002 icom inc. 2001 new ic-746pro.Qxd 02.4.2 11:32 page z.