INSTRUCTION MANUAL HF/50 MHz ALL MODE TRANSCEIVER This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. IMPORTANT READ THIS INSTRUCTION MANUAL CAREFULLY before attempting to operate the transceiver. EXPLICIT DEFINITIONS WORD R WARNING CAUTION NOTE DEFINITION Personal injury, fire hazard or electric shock may occur. Equipment damage may occur. If disregarded, inconvenience only. No risk or personal injury, fire or electric shock. SAVE THIS INSTRUCTION MANUAL. This manual contains important safety and operating instructions for the IC-756PROIII. FOREWORD We understand that you have a choice of many different radios in the market place. We would like to take a couple of moments of your time to thank you for making your IC-756PROIII your radio of choice, and hope you agree with Icom's philosophy of "technology first." Many hours of research and development went into the design of your IC-756PROIII. 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) ...................................... 1 t CW keyer plug (AP-330) .................................. 1 D FEATURES +30 dBm class IP3 (at 14 MHz band) and further improved 3rd order IMD characteristics Real time spectrum scope with mini-scope function Boudot RTTY demodulator and RTTY transmit message memory Selectable SSB transmission passband width (Each for Higher and lower pass frequency) Digital IF filter allows you to select 51 types of filter shapes while receiving a station q w e r t Spurious may be received near the following frequencies. These are made in the internal circuit and does not indicate a transceiver malfunction: 6.144 MHz, 8.000 MHz, 12.288 MHz, 12.890 MHz (when spectrum scope is ON), 18.433 MHz, 24.573 MHz, 52 MHz i Icom, Icom Inc. and the are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries. PRECAUTIONS R WARNING RF EXPOSURE! This device emits Radio Frequency (RF) energy. Extreme caution should be observed when operating this device. If you have any questions regarding RF exposure and safety standards please refer to the Federal Communications Commission Office of Engineering and Technology's report on Evaluating Compliance with FCC Guidelines for Human Radio Frequency Electromagnetic Fields (OET Bulletin 65). AVOID using or placing the transceiver in areas with temperatures below ­10°C (+14°F) or above +50°C (+122°F). Be aware that temperatures on a vehicle's dashboard can exceed 80°C (+176°F), resulting in permanent damage to the transceiver if left there for extended periods. AVOID placing the transceiver in excessively dusty environments or in direct sunlight. AVOID placing the transceiver against walls or putting anything on top of the transceiver. This will obstruct heat dissipation. Place unit in a secure place to avoid inadvertent use by children. During mobile operation, DO NOT operate the transceiver without running the vehicle's engine. When transceiver power is ON and your vehicle's engine is OFF, the vehicle's battery will soon become exhausted. Make sure the 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 magnetic navigation compass to prevent erroneous indications. BE CAREFUL! The heatsink will become hot when operating the transceiver continuously for long periods. BE CAREFUL! If a linear amplifier is connected, set the transceiver's RF output power to less than the linear amplifier's maximum input level, otherwise, the linear amplifier will be damaged. The LCD display may have cosmetic imperfections that appear as small or dark spots. This is not a malfunction or defect, but a normal characteristic of LCD displays. Use Icom microphones only (supplied or optional). Other manufacturer's microphones have different pin assignments, and connection to the IC-756PROIII may damage the transceiver. For U.S.A. only R WARNING HIGH VOLTAGE! NEVER attach an antenna or internal antenna connector during transmission. This may result in an electrical shock or burn. RWARNING! NEVER operate the transceiver with a headset or other audio accessories at high volume levels. Hearing experts advise against continuous high volume operation. If you experience a ringing in your ears, reduce the volume or discontinue use. R CAUTION! NEVER change the internal settings of the transceiver. This result in reduced transceiver performance and/or damage to the transceiver. In particular, incorrect settings for transmitter circuits, such as output power, idling current, etc., might damage the expensive final devices. The transceiver warranty does not cover any problems caused by unauthorized internal adjustment. R NEVER apply AC to the [DC13.8V] jack on the transceiver rear panel. This could cause a fire or ruin the transceiver. R NEVER apply more than 16 V DC, such as a 24 V battery, to the [DC13.8V] jack on the transceiver rear panel. This could cause a fire or ruin the transceiver. R NEVER let metal, wire or other objects touch any internal part or connectors on the rear panel of the transceiver. This may result in an electric shock. R NEVER expose the transceiver to rain, snow or any liquids. R NEVER installing the transceiver in a place without adequate ventilation. Heat dissipation may be affected, and the transceiver may be damaged. R NEVER operate or touch the transceiver with wet hands. This may result in an electric shock or damage to the transceiver. CAUTION: Changes or modifications to this device, not expressly approved by Icom Inc., could void your authority to operate this device under FCC regulations. ii TABLE OF CONTENTS IMPORTANT .................................................................. i FOREWORD ................................................................. i EXPLICIT DEFINITIONS ............................................... i SUPPLIED ACCESSORIES .......................................... i PRECAUTIONS ............................................................ ii TABLE OF CONTENTS .............................................. iii 1 PANEL DESCRIPTION ..................................... 1 ­ 12 Front panel ....................................................... 1 LCD display ..................................................... 9 Screen menu arrangement ............................ 10 Rear panel ...................................................... 11 Microphone (HM-36) ...................................... 12 2 INSTALLATION AND CONNECTIONS .......... 13 ­ 20 Unpacking ...................................................... 13 Selecting a location ........................................ 13 Grounding ...................................................... 13 Antenna connection ....................................... 13 Required connections .................................... 14 Advanced connections ................................... 15 Power supply connections ............................. 16 Linear amplifier connections .......................... 17 External antenna tuner connections .................................................... 18 Transverter jack information .......................... 18 Microphone connector information ................ 18 FSK and AFSK (SSTV) connections .................................................... 19 Accessory connector information ................... 20 3 BASIC OPERATION ....................................... 21 ­ 32 When first applying power (CPU resetting) .............................................. 21 Initial settings ................................................. 21 VFO description ............................................. 22 Selecting VFO/memory mode ........................ 23 Main/Sub band selection ............................... 23 Selecting an operating band .......................... 24 D Using the band stacking registers ............... 24 Frequency setting .......................................... 25 D Tuning with the tuning dial ........................... 25 D Direct frequency entry with the keypad ....... 25 D Quick tuning step ......................................... 26 D Selecting "kHz" step .................................... 26 D Selecting 1 Hz step...................................... 27 D 1/4 tuning function (SSB data/CW/RTTY only) .......................... 27 D Auto tuning step function ............................. 28 D Band edge warning beep............................. 28 Operating mode selection .............................. 29 Volume setting ............................................... 29 Squelch and receive (RF) sensitivity ............. 30 Meter function ................................................ 31 SWR reading ................................................. 31 Basic transmit operation ................................ 32 D Transmitting ................................................. 32 D Microphone gain adjustment ....................... 32 4 RECEIVE AND TRANSMIT ............................ 33 ­ 54 Operating SSB ............................................... 33 D Convenient functions for receive ................. 33 D Convenient functions for transmit ................ 34 D About 5 MHz band operation (USA version only) ....................................... 34 Operating CW ................................................ 35 D Convenient functions for receive ................. 35 D Convenient functions for transmit ................ 36 D About CW reverse mode ............................. 36 D CW side tone function ................................. 36 D About CW pitch control ................................ 37 Electronic CW keyer ...................................... 38 D Memory keyer send screen ......................... 39 D Editing a memory keyer ............................... 40 D Contest number set mode ........................... 41 D Keyer set mode ........................................... 42 Operating RTTY (FSK) .................................. 44 D Convenient functions for receive ................. 44 D About RTTY reverse mode .......................... 45 D RTTY filter/Twin peak filter........................... 45 D Functions for the RTTY decoder indication . 46 D Setting the decoder threshold level ............. 46 D RTTY memory transmission ........................ 47 D RTTY tuning meter ...................................... 47 D Editing RTTY memory ................................. 48 D RTTY decoder set mode.............................. 49 Operating AM ................................................. 50 D Convenient functions for receive ................. 50 D Convenient functions for transmit ................ 50 Operating FM ................................................. 51 D Convenient functions for receive ................. 51 D Convenient functions for transmit ................ 51 Repeater operation ........................................ 52 D Setting the repeater tone ............................. 52 Tone squelch operation .................................. 53 Data mode (SSTV/PSK31) operation ............ 54 5 FUNCTION FOR RECEIVE ............................ 55 ­ 65 Spectrum scope screen ................................. 55 D Mini scope screen........................................ 55 D Scope set mode........................................... 56 Preamplifier .................................................... 57 Attenuator ...................................................... 57 RIT function .................................................... 58 AGC function .................................................. 59 Twin PBT operation ........................................ 60 IF filter selection ............................................. 61 DSP filter shape .............................................. 62 Dualwatch operation ...................................... 63 Noise blanker ................................................. 64 Notch function ................................................ 64 Noise reduction .............................................. 65 Dial lock function ............................................ 65 iii TABLE OF CONTENTS 6 FUNCTION FOR TRANSMIT ......................... 66 ­ 72 VOX function .................................................. 66 D Using the VOX function ............... ...