294CONNECTION AND MAINTENANCE4n AntennaA key element in the performance of any communication sys-tem is an antenna. Contact your dealer about antennas andthe best places to mount them.n Fuse replacementA fuse is installed in the supplied DC power cable. If a fuseblows or the transceiver stops functioning, track down thesource of the problem if possible, and replace the damagedfuse with a new rated one.q Fuse rating: 10 AUSE the 10 A fuse only.n CleaningIf the transceiver becomes dusty or dirty, wipe it clean with asoft, dry cloth.AVOID the use of solvents such as benzene or al-cohol, as they may damage the transceiver sur-faces.n Options• RMK-2 separation kit + OPC-609 separation cableAllows you to install the transceiver main unit separatelyfrom the front panel for operating convenience.• SP-5/SP-22/SP-30 external speakersInput impedance : 4 øMax. input power : 5 W (SP-5/SP-22), 40W (SP-30)SP-5 : Large speaker for good audio quality.SP-22 : Compact and easy-to-install.SP-30 : High input power level.• HM-152/HM-152T/HM-148G/HM-148T hand microphonesHM-152 : Hand microphoneHM-152T : DTMF microphoneHM-148G : Self ground heavy duty microphoneHM-148T : Self ground heavy duty DTMF microphoneThe 10-keypad of this microphone can be used forthe DTMF code transmission only.• SM-25 desktop microphone• UT-109 (#02)/UT-110 (#02) scrambler unitsNon-rolling type (UT-109)/Rolling type (UT-110) voice scram-bler unit provides higher communication security.• OPC-617 acc cableAllows you to connect to an external terminal.Some options may not be available in some countries. Please askyour dealer for details.