Kenwood TK-7100H Service Manual

Also see for TK-7100H: Specifications Service manual

Contents

5 Scan Information175.2 Description of Functions5.2.1 PriorityPriority Scan allows you to check the presence ofSignals on the Priority Channels by adding them tothe Scan List.The Look Back operation activates when receiving acall on a normal Channel during Priority Scan.You can operate Priority Scan by selecting “Fixed” or“Selected” in Priority Scan. Fixed Priority ScanThe transceiver scans the preset Channel as thePriority Channel. Selected Priority ScanThe transceiver scans the Selected Channel asthe Priority Channel. You cannot select theSelected Priority Channel using the FPU.5.2.2 Priority Group/ChannelYou can select a Group/Channel for executing FixedPriority Scan.5.2.3 Look BackThis function allows you to check the presence of asignal on the Priority Channel while receiving a callon a normal Channel during Priority Scan.This function routinely monitors calls from PriorityGroups. Look Back Time A is used when no signalsare present and Look Back Time B is used whenthere is a Carrier with unmatched signalling on thePriority Channel. Look Back Time AThis is the time period for monitoring the PriorityChannel during Priority Scan when no signals arepresent. Look back Time A must be shorter thanLook Back Time B as the transceiver may receivea signal on the Priority Channel. The transceiverexecutes the scan smoothly when there is noCarrier signal on the Priority Channel. Thetransceiver receives signals on normal Channelseven if Look Back Time A is shorter than LookBack Time B. Look Back Time BThis is the time period for monitoring the PriorityChannel when a carrier does not match theprogrammed QT/DQT during Priority Scan.Other stations may be using the same frequencyas the Priority Channel therefore Look back TimeB must be longer than Look Back Time. A as thetransceiver may not receive a call from the PriorityChannel immediately.The Priority Channel stand-by time becomeslonger as the transceiver checks the QT/DQTwhen there is a Carrier signal on the PriorityChannel. In this case, the user may not hear thereceiving signal immediately. You can set arelatively long time for Look Back Time B using theFPU. Priority Scan operationThe transceiver monitors signals in the followingsequence: Priority CH -> Normal CH -> PriorityCH -> Normal CH -> Priority CH ->… ExampleCH1 = Priority CHCH2 (ADD)CH3 (DEL)CH4 (Not stored)CH5 (ADD)CH1(P) CH2(N) CH1(P) CH5(N) CH1(P) CH2(N)The transceiver receives a signal on a normalChannel and pauses Scan (Priority CH = NotBusy). Example: Scan pauses on CH 5.CH5(N) CH1(P) CH5(N) CH1(P)Look Back Time A Look Back Time AThe transceiver receives a signal on a NormalChannel and pauses the scan (Priority CH = Busy,QT/DQT = Unmatched).CH5(N) CH1(P) CH5(N) CH1(P)Look Back Time B Look Back Time BNote: The normal Channel is displayed even if thetransceiver executes the Look Back function after Scanpauses on that Channel.Note: The transceiver receives a call and moves to thePriority Channel when receiving a Carrier signal andQT/DQT while the Look Back function is operating.5.2.4 Revert ChannelThe Revert Channel is the Group/Channel that isused for transmitting while pressing the PTT switchduring Scan.There are four types of Revert Channels: Selected,Selected + Talkback, Priority and Priority + TalkBack. SelectedYou can transmit using the selectedGroup/Channel (selected Channel). Selected + TalkBack