IMPORTANT ............................................................. i PRECAUTIONS ........................................................ i EXPLICIT DEFINITIONS .......................................... i TABLE OF CONTENTS............................................ ii UNPACKING............................................................. ii 1 PANEL DESCRIPTION .....................................1–8 Front panel ............................................................... 1 Function switches ..................................................... 3 Rear and side panels ............................................... 5 Function display ....................................................... 7 Microphone (HM-103)............................................... 8 2 INSTALLATION AND CONNECTIONS .......... 9–14 Unpacking ................................................................. 9 Grounding ................................................................. 9 Antenna .................................................................... 9 Installation ................................................................ 10 Required connections ............................................... 11 Advanced connections ............................................. 12 Power supply connections ........................................ 13 External antenna tuners and linear amplifier ............ 14 3 FREQUENCY SETTING................................15–19 When first applying power (CPU resetting) .............. 15 Initial settings ............................................................ 15 VFO description ........................................................ 16 Frequency setting ..................................................... 17 Mode selection ......................................................... 19 4 RECEIVE AND TRANSMIT .......................... 20–38 Functions for receive ................................................ 20 Functions for transmit ............................................... 25 Split frequency operation .......................................... 29 Tone squelch operation ............................................ 31 Tone scan operation ................................................. 31 One-touch repeater .................................................. 32 Auto repeater function .............................................. 32 Functions for CW ...................................................... 33 Functions for RTTY .................................................. 35 Packet operation ...................................................... 37 SWR ......................................................................... 38 5 MEMORY AND SCAN OPERATION ............ 39–44 Memory channels ..................................................... 39 Memory channel selection ........................................ 39 Memory clearing ....................................................... 39 Memory/call programming ........................................ 40 Frequency transferring ............................................. 41 Memory names ......................................................... 41 Memo pads ............................................................... 42 Scan types ................................................................ 43 Preparation .............................................................. 43 Programmed scan operation .................................... 44 Memory scan operation ............................................ 44 Select memory scan operation ................................. 44 Priority watch ............................................................ 44 6 REMOTE JACK (CI-V) INFORMATION ........ 45–46 7 SET MODE ....................................................47–55 General ..................................................................... 47 Quick set mode items ............................................... 48 Initial set mode items ............................................... 50 8 MAINTENANCE ...................................................56 Fuse replacement ..................................................... 56 Memory backup ........................................................ 56 Cleaning ................................................................... 56 9 TROUBLESHOOTING ..................................57–58 10 OPTIONAL INSTALLATIONS/SETTINGS .. 59–62 Opening the transceiver case ................................... 59 UT-102 VOICE SYNTHESIZER UNIT ............................... 59 CR-282 HIGH-STABILITY CRYSTAL UNIT ........................ 60 IF filters ..................................................................... 60 UT-106 DSP RECEIVER UNIT ....................................... 61 MB-72 CARRYING HANDLE .......................................... 61 AT-180 internal switch description ............................ 62 11 INTERNAL VIEWS.............................................63 12 OPTIONS ....................................................64– 65 13 SPECIFICATIONS .............................................66 14 MENU GUIDE ..............................................67–68