User manual ICOM IC-446S

[. . . ] INSTRUCTION MANUAL PMR446 FM TRANSCEIVER i446S FOREWORD Thank you for purchasing the IC-446S PMR (Private Mobile Radio) FM transceiver. This PMR FM transceiver meets the European PMR specification (PMR446). This transceiver is designed for those who require top-grade quality, performance and outstanding reliability under the most demanding conditions. FEATURES G Free of user-license and applications G All 8 PMR channels are available G 38 convenient group channels G Water-resistant construction G 500 mW (ERP) High output power I ATS (Automatic Transponder System) This convenient function automatically checks station availability within the operating range, and alerts you via function display indication. 17) In addition, a manual transponder is also available for "GROUP MODE" operation to check availability of stations in a specified group within the operating range. [. . . ] · The power on indicator and operating channel number appear on the display. UP 4 R POWE MODE DO W N ` Adjusting the volume q Push and hold [MODE] for 1sec. · Busy indicator appears on the display while the squelch is open. w Adjust the audio to a suitable level using [VOL]. to close the squelch. UP w R POWE MODE DO W N qe What is squelch? A squelch circuit allows you to mute undesired noise while receiving no signal and emit audio while receiving signals. The [MODE] key changes the squelch setting. This is useful to listen to weak signals that do not open the squelch. 8 4 BASIC OPERATION ` Selecting the operating channel Push [UP]/[Y] or [DOWN]/[Z] keys several times until the desired operating channel number appears on the display. · While pushing and holding [UP]/[Y] or [DOWN]/[Z] keys, the displayed channel changes continuously until channel number " 1 " appears. If you want to keep the automatic selection, release the [UP]/[Y] or [DOWN]/[Z] keys then push and hold them again. UP R POWE MODE DO W N · When displayed channel stops at channel number "1", a warning beep is emitted. NOTE: · The transceiver has 8 operating frequency channels. · The selected channel is memorised when you turn off the transceiver. e Push [MODE] to cancel the group mode. NOTE: Only stations with the same group channel number can be heard during group mode operation, even when the busy indicator appears on the display. 11 GROUP MODE (CTCSS) 6 What is CTCSS (Continuous Tone Coded Squelch System) GROUP MODE ?CTCSS (Continuous Tone Coded Squelch System) GROUP MODE allows communication with silent stand by. Only signals containing your group code can open the squelch. This conveniently eliminates unwanted audio and is useful in group activities or security related activities where unwanted output can be a problem. Note that CTCSS group mode is not private--anyone can receive your calls. The IC-446S is equipped with 38 tone codes for CTCSS GROUP MODE use. Selecting a code applies it to all 8 operating channels. Each push of [PTT] superimposes your group code over your transmit signal; and, only signals containing the same code can open your squelch. To temporarily hear all signals (including noise) push and hold [MODE]. Do not use CTCSS GROUP MODE if you want to be able to hear signals on all channels. 12 6 GROUP MODE (CTCSS) D CTCSS code table CH 01 02 03 04 05 06 07 08 09 10 Freq. 67. 0 71. 9 74. 4 77. 0 79. 7 82. 5 85. 4 88. 5 91. 5 94. 8 CH 11 12 13 14 15 16 17 18 19 20 Freq. 97. 4 100. 0 103. 5 107. 2 110. 9 114. 8 118. 8 123. 0 127. 3 131. 8 CH 21 22 23 24 25 26 27 28 29 30 Freq. [. . . ] In such case, we recommend to replace the batteries, when the "Low Battery Indicator" appears during transmission. ` Resetting the transceiver Initialize the operating conditions before using the transceiver for the first time, or if the function display shows erroneous information. While pushing [DOWN]/[Z] and [MODE], push [POWER] ON to initialize the transceiver. UP RPT R POWE MODE DO W N CAUTION: Resetting the transceiver returns all settings to their defaults. 18 8 OTHER FUNCTIONS ` Optional HM-75A functions The optional HM-75A allows you to remotely select operating channels, open the squelch, etc. The switches on the HM-75A function as follows. CAUTION: When connecting the HM-75A to the transceiver, make sure that power to the transceiver is turned OFF, otherwise the transceiver may malfunction. SWITCH A B UP NORMAL Smart-Ring Open squelch Change the operating channel number up. [. . . ]