Kenwood TK-7100H Service Manual

Also see for TK-7100H: Specifications Service manual

Contents

662 Channel Information2.1 OverviewYou can program Channels in “Edit > ChannelInformation > Channel Edit” in the FPU.The maximum number of channels is 64.2.1.1 Receive FrequencyYou must program the transceiver receive frequencywithin the range of permitted frequencies.2.1.2 Transmit FrequencyYou must program the transceiver transmit frequencywithin the range of permitted frequencies.2.1.3 QT/DQTQT/DQT is the Signalling used to facilitatecommunication within a Group when sharing thesame channel with several groups (Talk Group).Using this type of signalling, you do not need to hearunwanted communications.The transceiver mutes unwanted calls that areprogrammed with different QT/DQT settings.QT/DQT Signalling uses frequencies outside thevoice frequency range so that it does not interferewith communications.The transceiver can distinguish the Signalling, whichis a continuous wave form, even if reception beginsmidway through a transmission.The Squelch Tail Eliminator, when using QT/DQT,eliminates the noise burst heard by the receivingparty from the transmitting party radio. QTQT (Quiet Talk) uses a continuous sub-audiblesinewave (67.0 Hz ~ 254.1 Hz).The Reverse Burst function that reverses thephase of the sine wave works as the Squelch TailEliminator. DQTDQT (Digital Quiet Talk) uses a 23-bit binarynumber.You can program the DQT code from 023 ~ 754 inHexadecimal.The DQT signal has polarity and can be programmedas either Normal or Inverse, corresponding to arepeater or the circuit configuration of the othertransceiver. The Squelch Tail Eliminator when usingDQT reverses the polarity from what is currentlybeing used.When the received QT/DQT code matches theQT/DQT code programmed in the transceiver, thespeaker unmutes.The speaker mutes when the transceiver receives aReverse Burst (QT) or a Turn Off Code (DQT).2.1.4 QT/DQT EncodeThe transceiver transmits the QT/DQT codeprogrammed in the transceiver when the PTT switchis depressed.The Reverse Burst in QT and the Turn Off Code inDQT are transmitted for 176 ms after releasing thePTT switch.2.1.5 Channel NameThe programmed channel may have a nameassigned to it using the FPU.The Channel Name allows you to easily identify thecaller (Ex. “BASE”, “DELIVERY”, “FRONT”,“PORTER”).You can program up to 8 characters for the ChannelName using the following characters:(space) # $ % ( ) * + , - / 0 1 2 3 4 5 6 7 8 9 = @ \ _ AB C D E F G H I J K L M N O P Q R S T U V W X Y ZThe Channel Name appears in “Optional Features >Display Character > Channel Name” of the FPU.2.1.6 Wide/NarrowYou can select 25 kHz (Wide Bandwidth) or 12.5 kHz(Narrow Bandwidth) for the bandwith of eachChannel.2.1.7 TX PowerThis function allows you to set the transmit poweroutput for each Channel to either High or Low.2.1.8 Option SignallingOption Signalling is used for receiving calls from theDispatcher.Option Signalling may include “DTMF”, “2 Tone” and /or ”MSK”; the TK-7100H/8100H uses “DTMF” forOption Signalling.