This manual contains important safety and operating instructions for the IC-718. PRECAUTIONS RWARNING HIGH VOLTAGE! NEVER attach an antenna or internal antenna connector during transmission. This may result in an electric shock or burn. RNEVER apply AC to the [DC13.8V] jack on the transceiver rear panel. This could cause a fire or ruin the transceiver. RNEVER 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

VERSION SYMBOL #02 Europe EUR #04 Australia AUS #06 U.S.A. USA-1 #07 Korea KOR NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than 16 V. This will ruin the transceiver. DO NOT expose the transceiver to rain, snow or any liquids. DO NOT reverse the polarities of the power supply when connecting the transceiver. DO NOT apply an RF signal of more than 20 dBm (100 mW) to the antenna connector. This could damage the transceiver’s front end. To upgrade quality, an

5-1 5-2 TRANSMITTER CIRCUITS.................................................... 5-2 5-3 PLL CIRCUITS ............................................................. 5-4 5-4 DIGITAL CIRCUITS.......................................................... 5-5 5-5 POWER SUPPLY CIRCUITS................................................... 5-5 5-6 PORT ALLOCATIONS........................................................ 5-5 SECTION 6 ADJUSTMENT PROCEDURES 6-1 PREPARATION.................................

Install the optional unit as follows. © Rotate [VOL] to turn the power OFF, and remove the battery pack. @ Remove the unit cover as below. (The removed unit cover can not be used again.) © Install the unit as below. © Cut the pattern on the PC board at “MIC” and “DISC” as below. (This modification is not necessary for UT-108R installation.) "DISC “MIC" © Remove the paper backing of the supplied unit cover, and attach the unit cover and the battery pack, then rotate [VOL] to turn the power

RN ORDER NO. DESCRIPTION M. H/V LOCATION L901 6200006190 S.COL BLM21 PG300SN1 D T 8.7/6 C901 403001 7460 S.CER ECJ0EB1E102K T 5.6/6 C902 4030017420 S.CER ECJ0EC1H470J T 5.6/7 J901 6910015881 CNR 9230B-1-02Z141 -PT1 M.=Mounted side (T: Mounted on the Top side, B: Mounted on the Bottom side) S.=Surface mount 7 - 5 • BC-160 (Optional product) [MAIN UNIT] REF NO. ORDER NO. DESCRIPTION M. H/V LOCATION IC1 1110006480 S.IC NJM2801U1-0543-TE1 B 10.2/62.3 IC2 1110003071 S.IC MPC494GS-

The amplified MIC signals are output from pin 8, and passed through the analog switch (IC3, pins 4, 3), AF mixer (IC5, pins 6, 7) where the MIC signals and tone signals are mixed with. * TONE SIGNALS The CTCSS/DTCS signals are generated by the CPU (IC22) and output from pins 19-21. The output signals are passed through the 3 resistors (R222-R224) to change its waveform. The waveform changed CTCSS/DTCS signals are passed through the LPF (IC7, pins 10, 8), tone filter switch (Q40) and D/A conver

NO. ORDER NO. DESCRIPTION QTY. J1 6910015910 Connector ANT connector-104 1 J2 6910015860 Connector IMSA-6277S-02A-G 1 SP1 2510001060 Speaker K036NA500-47 1 W1 8900009640 Cable OPC-963 1 MP1 8010020410 2927 chassis 1 MP2 8210022970 2927 T-front panel assembly [10-key] 1 8210022980 2927 S-front panel assembly [4-key] 1 MP8 8210020550 2721 rear panel 1 MP9 8310066450 2927 window plate 1 MP10 8930069510 2927 window sheet 1 MP12 8930069490 2927 keyboard [10-key] 1 8930069700 29

RN ORDER NO. DESCRIPTION M. H/V LOCATION L901 6200006190 S.COL BLM21 PG300SN1 D T 8.7/6 C901 403001 7460 S.CER ECJ0EB1E102K T 5.6/6 C902 4030017420 S.CER ECJ0EC1H470J T 5.6/7 J901 6910015881 CNR 9230B-1-02Z141 -PT1 M.=Mounted side (T: Mounted on the Top side, B: Mounted on the Bottom side) S.=Surface mount 7 - 5 • BC-160 (Optional product) [MAIN UNIT] REF NO. ORDER NO. DESCRIPTION M. H/V LOCATION IC1 1110006480 S.IC NJM2801U1-0543-TE1 B 10.2/62.3 IC2 1110003071 S.IC MPC494GS-

• Pu (PUSH): After pushing the [SQL] for 1 sec., and emits audio while pushing and holding • Ho (HOLD): After pushing the [SQL] for 1 sec., the squelch and emits audio even [SQL] is released. To close the squelch, push any key. PUSH Monitor action PUSH Monitor action Hold (default) D Automatic backlighting “ bL” This function is convenient for nighttime operation. The automatic backlighting can be adjusted from OFF, 1 (dark) – 3 (bright); 3 (default). Select 1– 3 to turn this function ON. • The

WARNING: MODIFICATION OF THIS DEVICE TO RECEIVE CELLULAR RADIO TELEPHONE SERVICE SIGNALS IS PROHIBITED UNDER FCC RULES AND FEDERAL LAW. FOREWORD Thank you for purchasing this The IC-R20 COMMUNICATIONS RECEIVER is designed and built with Icom’s superior technology and craftsmanship. product should provide you with years We want to take a couple of moments of your for making your IC-R20 your radio of choice, agree with Icom’s philosophy of “technology first.” Many hours of research and development