Kenwood TH78E, TH-78A instruction manual Duplex Operation

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DUPLEX OPERATION

Normally this transceiver operats in a simplex mode, i.e. No receive audio from the sub-band is fed to the speaker during transmit on the main or active band.

If you prefer duplex operation, i.e. Receive audio from sub-band is fed to the speaker during transmit you must perform the following procedure.

Press the F key then press the DUAL key. The DUP indicator will appear on the display.

Duplex operation is now possible.

Occasionally the microphone might pick up receive audio, causing howling to occur. To prevent howling in the duplex mode, use an earphone (see page 50) to listen to the receive audio, or perform the following operation.

Press and hold the F key for longer than one second then press the DUAL key. The DUP indicator will flash.

In this mode, the microphone sensitivity and receive audio are reduced automatically to prevent howling. The transmitter output power is also automatically set to the EL position.

You can select the desired transmitter output power by pressing the F key then the D/LOW key.

To cancel this function, repeat the procedure for setting the function. The DUP indicator disappears from the display.

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Contents TH-78A Contents Dual Tone Squelch System Dtss Accessories Before OperationControls Overview Key Page Page Tuning Control and Volume Control Receiver OperationGetting Started Separate volume control function Separate tuning control functionReturning to the original mode Selecting a Frequency Direct Keyboard Frequency Entry12.5 62.5 37.5 87.5 Using the Tuning Control Step Size SelectionChanges in the Displayed Frequency Programmable VFO Tuning Limits VFO tuning range 144.000 145.000 146.000 147.000 Basic Receiving FunctionsChanging Transmitter Output Power Transmitter OperationTo transmit, follow these steps Time-Out-Timer Output PowerwattsTX. Stop Function Initializing The Memory Using the MemoryMicroprocessor Memory Backup Memory ChannelEntering Normal Simplex/Repeater Channels Memory ContentsEntering Memory Data Clearing a Memory ChannelEntering Split Channel Frequencies Entering The Call Channel FrequencyUsing the numeric keypad Recalling Memory ChannelsMemory Shift Memory Channel Character Display Function SettingMessage Display Cancel Character registrationHold/Resume Programming Scan operation cancelScanning Hold/Resume SelectionScan Options Scanning Memory ChannelsBand scan Programmable Band ScanMHz Scan Confirming Scan LimitInitiating Programmable Band Scan VFO/Memory Scan11 V/M/CVFO/Memory/CALL Scan CALL/VFO ScanCall / Memory Scan Alert FunctionAutomatic Offset Selection Repeater OperationTransmitter Offsets Selecting the Offset DirectionManual Offset Selection Reverse FunctionTone Operation Selecting Tone FrequenciesTone Function Operating Selecting Delay Time Autopatch OperationsTo activate the keypad Recalling Stored Dtmf Codes in Receive Mode Dtmf MemoryStoring Dtmf Codes Operation AS a Repeater Making a Dtmf CallCtcss Operation Operating the Ctcss FunctionDtss Code Using the Dtss FunctionDual Tone Squelch System Dtss Selecting Dtss CodesPaging Operation Overview Setting Paging Codes Paging Code MemorySending Pages Calling Group Communication Network ExampleCalling All Group Members Code setting mode Paging mode Calling a Specific Group MemberReceiving Pages Wait Receiving a Page with an Individual CodeReceiving a Page with a Group code Locking Out Codes Canceling Signal SquelchCanceling signal type squelch Answer-BackMessage Transmission and Reception Using the Message MemoryMemory write procedure Message Transmission ModesLnpu t Key Message Memory Transmission Dtss modeMessage Memory Check Message ReceptionPaging mode Receive Message MemoryReceive message memory clear Enhanced Receiver Functions Tone Alert SystemSelecting a Beep Sound Lamp MonitorBeepOff Key LockVolume adjustment when you use an earphone CAUT/ONTo simultaneously receive two VHF band signals To simultaneously receive two UHF band signalsAutomatic Band Change Function MHz Mode Single Band OperationChannelized Frequency Display Automatic Power Off APO Power Saver FeaturesBattery Saver Mode Battery Save Time SelectionTime Alarm Setting Time SettingTimer Function Switch-on Timer SettingSwitch-off Timer Setting Timer Start/StopAlarm Function Duplex Operation Changing Power-on Message Power on Message and Function MessagePower On Message Function Message250MS 450MSGeneral Information MaintenanceService Record KeepingTroubleshooting Optional unit Battery charger SMC-31 SMC-34 TSU-7 ME-1DVB lNVlSIS3tl LNflOk-4 13AIMS Installing the Ctcss Unit TSU-7 Memory Expansion Unit ME-l Programming the SMC-33 Remote Control Speaker Microphone Memory Control Functions Press the key below Press the F key, then Key belowUsing Other Microphone Specifications GeneralQuick Reference To do this PressThen f2 To do this

TH78E, TH-78A specifications

The Kenwood TH-78A and TH-78E are dual-band handheld transceivers that have earned a reputation for their advanced features and reliable performance in the amateur radio community. These transceivers are designed to operate on both the VHF and UHF bands, making them versatile tools for communication across different frequencies.

One of the standout features of the TH-78A and TH-78E is their dual receive capability, which allows operators to monitor two frequencies simultaneously. This is particularly useful for those who need to keep track of multiple communication channels, providing flexibility during operations. The transceivers also support a wide frequency range, ensuring compatibility with a diverse array of communication channels.

Both models are equipped with a large, easy-to-read display that enhances readability even in low-light conditions. The display provides essential information, such as frequency, channel, and battery status, ensuring operators can quickly access important data while on the move. An adjustable backlight further aids visibility in dark environments, making these radios a reliable choice for night operations.

The Kenwood TH-78A and TH-78E are known for their robust audio performance. They utilize advanced audio processing technology that enhances sound clarity, allowing for clear communication even in noisy environments. Additionally, the transceivers support a variety of digital modes, including CTCSS and DCS, which enable users to communicate securely by encoding their transmissions.

With a built-in 1000 memory channels, users can store and easily access their favorite frequencies. This extensive memory capability simplifies the task of switching between channels, making it easier for amateur radio enthusiasts to program and manage their communications. Furthermore, the radios feature programmable function keys that allow users to customize frequently used settings for quick access.

The TH-78A and TH-78E also come with a built-in GPS receiver, which is particularly beneficial for outdoor activities and emergency communications. The GPS functionality allows users to transmit their location coordinates, making it easier for others to locate them in case of emergencies.

In conclusion, the Kenwood TH-78A and TH-78E are powerful and versatile handheld transceivers that cater to amateur radio enthusiasts and professionals alike. Their dual-band operation, dual receive capabilities, comprehensive memory options, and advanced audio performance make these radios suitable for various communication needs. Whether for casual use or emergency situations, the TH-78 series remains a reliable choice for effective and efficient communication.
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