Kenwood TH-78A manual

144/430 MHz FM Dual Bander 144/440 MHz FM Dual Bander TH-78A 144/430MHz FM Dual Bander TH-78E INSTRUCTION MANUAL KENWOOD CORPORATION @PRINTED IN JAPAN B62-0248-30(W)(MC) 94/654321 93/1211 109876543 2[...]

ACCESSORIES ................... . BEFORE OPERATION ............. . Controls Overview ............. . THE BATTERY PACK 1 NiCd Battery Pack (PB-13). ...... . . . . . . . . . 2 Recharging. .................. . 3 Installing The Battery Pack. ..... . . 4 Battery Voltage Level .......... . . . 5 Battery Operating Time ........ . . RECEIVER OPERATION 1 Ge[...]

THE DUAL TONE SQUELCH SYSTEM (DTSS) 1 DTSS Code. .......................... . 36 2 Using the DTSS Function ............... . 36 3 Using DTSS with a Repeater. ............ . 37 PAGING 1 Paging Operation Overview ............. . 38 2 Paging Code Memory .................. . 39 3 Setting Paging Codes ................. . .39 4 Sending Pages (Calling). .[...]

ACCESSORIES Antenna . . . . . . . . . . . . . . . . . . . . . . . T90-0444-X X Belt Hook . . . . . . . . . . . . . . . . . . . . . . J29-0465-X X Hand Strap . . . . . . . . . . . . . , . . . . . . J69-0312- X X Rubber Cap . . . . . . . . . . . . . . . . . . . . B09-0330- X X AC plug (M type only) . . . . . . . . . . . . . E19-0254- X X Battery Case[...]

Controls Overview This transceiver has different key layouts for each destination. Check the version of your transceiver first by looking at the following illustration. All types except U.K and European version U.K and Europe version only 6[...]

This diagram will help you locate the keys, switches, DC IN TERMINAL and knobs you’ll need to perform necessary operations. Please study these controls carefully. By ANTTENA SPEAKER/HEADPHONE JACK the time you reach the end of this manual, you will CONNECT MICROPHONE JACK have had to use each of them many times. BUSY (GREEN)/ON AIR (RED) INDICATO[...]

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RECEIVER OPERATION 1 Getting Started Connect the battery pack and the supplied antenna. Press the POWER switch to turn the transceiver on. One of the default frequencies should appear on the display. 2 Tuning Control and Volume Control This transceiver assigns two volume and tuning control functions to the two controls. Before proceeding to the nex[...]

When you press the BAND key, control of each function is transferred to the VHF band. When you press and hold the E.CHG key (or within two seconds of pressing the E.CHG key), each control temporary control of the volume or tuning control passes to the VHF band. We recommend that you use this function in order to temporarily change the volume or fre[...]

Whenever you are selecting frequencies, your first step should be to set the squelch control. The squelch helps eliminate “white noise” or static until you receive active communications on a frequency. There are two squelch controls, one for the UHF band and one for the VHF band. To set the squelch controls: 3 Selecting a Frequency You have sev[...]

For the European version and some other markets, Next press numeric keys 0 and 5. 5 The transceiver actually changes frequency only after the 1 kHz digit is entered. The 1 kHz digit is not displayed if it is a zero. If you do not enter the 1 kHz digit, the indicator flashes and the transceiver defaults to the previous operating frequency. Notes 1 I[...]

Using the Tuning Control The tuning control selects frequencies in up or down sequentially. Rotate the tuning control clockwise or counterclockwise to select the desired operating frequency. 4 Step Size Selection 1 2 14 The transceiver must be in the VFO mode to select frequency steps. To select the desired tuning or scan step size use the followin[...]

From step size 12.5 or 25 To step size 5,10, 15, or 20 Frequencies Display as 0 0 12.5 10 25 20 37.5 30 50 50 62.5 60 75 70 87.5 80 5 Programmable VFO Tuning Limits This radio provides the capability of programming the VFO tuning range, in 1 MHz band segments, as well as providing a separate programmable band scan function. (See page 26) For exampl[...]

5 To confirm that the programming was properly performed rotate the Tuning control. The transceiver should not go above or below the programmed band limits. 6 Basic Receiving Functions When receiving a signal, the Main/Sub S-meter deflects and the Main/Sub BUSY indicators appea Rotate the volume control to the desired level. VFO tuning range 144.00[...]

TRANSMITTER WARNING: Before you attempt to transmit, attach an antenna with a low standing wave ratio to the antenna connector. Failure to provide a proper load may cause damage to the final amplifier section. Always check that the frequency is clear before transmitting. 1 To transmit, follow these steps: 1 Use any of the frequency selection method[...]

3 TX. Stop Function The TX Stop function allows you to temporally disable the transceiver transmit, preventing accidental or unauthorized transmission. Press the F key, then press the f 2 /TX.S key to turn the TX. Stop function on or off. No indicator means the high power position has been selected. Use high power for maximum transmitter power. See[...]

USING THE MEMORY 1 Microprocessor Memory Backup All memory channel data is backed up in EEPROM. It is not lost unless you reset the memory. All other data that you set is retained by a secondary lithium battery that will provide memory backup for about 20 days if you remove the battery pack or external DC power. A fully discharged battery will requ[...]

4 Memory Contents Each memory channel can store information as shown in the chart below. X =Can be stored in memory Normal Split Channel Channel RX frequency TX frequency Tone(CTCSS) frequency, Tone (CTCSS) status Frequency step Shift status, REV on/off X N/ A DTSS code. DTSS status X X 5 Entering Memory Data Entering memory data is a simple operat[...]

6 Entering Split Channel Frequencies Use the numeric keypad to select the desired receiver frequency, tone and other information. If the desired frequency is already on the display, continue to step 2. Press the M key. The memory indicator will flash. Use the keypad to select any desired memory channel number (O-49). For example, use a two digit nu[...]

3 Select the desired call channel transmit frequency. 4 Press the M key. 5 Press and hold the PTT switch and press the CALL key. 6 Release the PTT switch. 8 Recalling Memory Channels Press the MR key. You can change the memory channel by the following two methods. Using the Tuning Control Rotate the tuning control clockwise or counterclockwise to s[...]

10 Memory Channel Character Display You can display the memory channel frequency with your own spelling. It may be up to six characters long. You can use numerics 0 to 9 and the letters A 4 Enter your message with the keypad. See the list on page 45 for the key combinations for each letter. 5 If you enter the wrong message, press the VFO key to sta[...]

SCANNING You must adjust the squelch to the threshold point for proper scan operation. You cannot use scan in conjunction with the tone alert function and paging. Scanning occurs separately in the VHF and UHF bands. You can reverse the direction by turning the Tuning control or MESSAGE key. 1 Hold/Resume Programming This transceiver provides two ty[...]

3 Scan Options The following scan options are available: * Memory Scan Scans through those memory channels that have data stored and that have not been locked out. This function operates only in the memory mode. * Band Scan Scan proceeds over the entire band. This function operates only in the VFO mode. (page 26) n Programmable Band Scan The scan r[...]

2 Press the F key, then the 0/L.OUT key. A * indicator appears below the memory channel number on the display, indicating that channel will be skipped in the memory channel scan mode. 3 Repeat steps 1 and 2 to lockout any other channels you may want to skip. 4 To cancel the lockout, select the memory channel number. If it was locked out, it will ha[...]

5 Press and hold the M key for longer than one second, then press the 4 key. Notes 1 Initialize the VFO memory (VFO RESET) to clear both programmed limits simultaneously. Press and hold the F key and turn on the power. You can reprogram either limit independently. Initiating Programmable Band Scan 1 Adjust the SQL control to the threshold point. 2 [...]

2 Press the F key, then press the MR key. 3 The VFO frequency and the last used memory channel are scanned alternately. 9 CALL/VFO Scan 1 Press and hold the CALL key for longer than one second in VFO mode. 2 The frequency and CALL frequency are scanned alternately. 10 CALL / Memory Scan 1 Press and hold the CALL key for longer than one second in me[...]

REPEATER OPERATION 1 Transmitter Offsets All amateur radio repeaters use a separate receive and transmit frequency. The receive frequency may be above or below the transmit frequency. Most repeater configurations fall into one of the following categories. Offset Direction UHF Band (European version VHF Band UHF Band only) 2 Selecting the Offset Dir[...]

4 Manual Offset Selection 5 The Reverse Function The factory default sets the automatic offset frequency. You can select any offset frequency in the range 0 to 99.9 MHz in 100 kHz steps. Some repeaters use a ’ reverse pair’, that is, the transmit/receive frequencies are the reverse of other repeaters. 1 Press and hold the SHIFT/REV key and swit[...]

6 Tone Operation Some repeaters require a control signal to activate them. Several different methods are currently in use. In the United States, sub-audible tones are sometimes used. This transceiver will generate sub- audible frequencies. In Europe and the United Kingdom, a 1750 Hz tone is used in transmitting. Simply press and hold the TONE key t[...]

7 Autopatch Operations (U.S.A. versions only) Some repeaters offer a service called autopatch. This feature allows you to dial a telephone number from your transceiver and carry on a telephone conversation. This function requires the use of a DTMF (Dual Tone Multi Frequency) keypad. The transceiver also provides four additional keys - A, B, C, and [...]

8 DTMF Memory You can store 10 DTMF telephone numbers up to a maximum of 15 digits long in memory. Storing DTMF Codes 1 Press the M key, then press the MHz key to select the DTMF code entry mode. 2 Enter the DTMF code on the keypad 3 Press the MR key after entering the DTMF code. 4 Select the channel (O-9) where you want to store the DTMF code and [...]

Making a DTMF Call 1 Hold the PTT switch down and press the MHz key. 2 Press the numeric key (O-9) for the channel where the DTMF code is stored. 3 The DTMF code appears on the display. Note Transmission continues until the whole code string is recalled, even if the PTT switch is released. You cannot stop DTMF code transmission once it is initiated[...]

CTCSS OPERATION The CTCSS unit (TSU-7) is included only with models delivered to the United States and Canada. The CTCSS unit (TSU-7) installation instruction are shown on page 63. If the Continuous Tone Code Squelch System (CTCSS) function is activated, the transceiver will not open squelch until it receives the proper PL tone (tone squelch). Sele[...]

THE DUAL TONE SQUELCH SYSTEM (DTSS) DTSS allows squelch activation in the receive mode when the transceiver receives a three-digit code matching the DTSS code you have selected. Once squelch is activated, it operates normally from then on. If no signal is received for more than two seconds, squelch turns off until the transceiver receives a matchin[...]

Paging uses a DTMF (Dual Tone Multi Frequency) signal and is useful in calling members of a group, a specific station, or for waiting for a call from another station. F: 145.020MHz Individual Code: 111 F: 145.020MHz F: 145.020MHz F: 145.020MHz lndividual Code 222 lndividual Code: 333 lndividual Code 444 Member 1 Member 2 Member 3 You should determi[...]

2 Paging Code Memory There are 8 paging code memories. Memory Cod e 1~ 6 Use Stores your station ID code in memory. Automatically stores the calling station’s code during reception. Can temporarily set the code for the station to be called. Stores group codes and local station codes in memory. 3 Setting Paging Codes First, you must program your I[...]

The chart shows how members of a group might communicate with each other. You may wish to refer back to this chart as you read the examples on the following gages. Your station ID code is preset in memory A. You Group Communication Network Example Predetermined frequency 145.020MHz Your Individual code Member 1 Member 2 Member 3 Group code 111 Indi[...]

Press the PTT switch. Communication is possible in both the Paging and code setting mode. In the code setting mode In the Paging mode 145.02 MHz The group code 789 and your station ID code 111 are transmitted. Calling a Specific Group Member Use the following procedure to call a specific group member: 1 Select the local station code memory. In this[...]

5 Receiving Pages (Wait) 1 Tune to the predetermined frequency. 2 Press the F key then press the 1 key to enter the Paging mode. Receiving a Page with an Individual Code 1 When the proper code is received, your squelch will open and you will hear an alert tone sequence coming from the speaker. 2 If the calling station transmits your individual call[...]

6 Canceling Signal Squelch Squelch will not open when operating in the paging mode when the paging codes do not match. It is possible to reprogram the transceiver so that squelch will open regardless of the incoming page code. Even when signal squelch is canceled, a beep sounds and the individual code of the local station is displayed when the prop[...]

MESSAGE TRANSMISSION AND RECEPTION This function lets you transmit your message to the other party or display a message from the other party on your transceiver using the DTMF (Dual Tone Multi Frequency) signal and alphanumeric display. You can use the numerics 0 to 9 and letters A to Z. The message that can be transmitted and received at one time [...]

Relationship between input characters and keys (Note: “ + ” means press two keys in sequence (with in 2 seconds)) lnpu t characters Key operation 0 0 1 1 2 2 3 3 lnput characters Key operation Z 1+B (M) B 2+B(M ) E 3+B (M) H 4+B(M ) K 5+B (M) N 6+B (M) R 7+B (M) U 8+B (M) X 9+B (M) (space) L 5+c (f² ) O 6+ C (f²) S 7+C (f²) V 8+C (f²) Y 9+C[...]

5 Press a key (0 to 9) corresponding to the numeric you want to enter to memory. 6 To cancel message input mode, press the PTT switch. 3 Message Memory Check 1 Press and hold the F key for longer than one second, then press the MESSAGE key. 2 Press a desired key (0 to 9). 3 To return to the normal frequency display, press any key (except 0 to 9 key[...]

H Paging mode Press any key 6 Receive Message Memory This transceiver has 10 incoming message memory channels, in which received messages are stored. If you press the MESSAGE key in the message mode, the last stored message is displayed. You can store your message in memory using one of the following two methods. You can select the desired mode. n [...]

ENHANCED RECEIVER FUNCTIONS 1 The Tone Alert System The Tone Alert function provides an audible alarm to indicate when someone is transmitting on the frequency you are monitoring. If you use the tone alert function with the CTCSS, paging, or DTSS function, you can use the functional more effectively since you can wait for a call from a specific rem[...]

2 Monitor Even if the squelch or CTCSS, DTSS, or PAGING is ON, you can monitor the channel by pressing the MONI key. 3 BeepOff The transceiver produces beeps when you push the front panel keys. If you want to disable this function, press and hold the 6 key and press the POWER switch. 4 Lamp If you press the LAMP key, the LCD illumination lamp light[...]

6 Volume adjustment when you use an earphone r CAUT/ON If you use an earphone, you may feel that the volume is too high even if the volume level is set to minimum. We recommend that before connecting the earphone, you set the volume level to the minimum and perform the following operation to protect your ears. 1 Press and hold the 4 key and turn th[...]

8 Automatic Band Change Function The Automatic Band Change function automatically switches transmit control from the RX/TX band to the RX only band whenever a signal is received that opens squelch on the RX only band. 1 Press the F key, then press the BAND/A.B.C. key within 10 seconds. The A B C indicator displays. 9 Simultaneous Receive Function o[...]

Notes on simultaneous in Band reception 1 When two signals on the same band are received simultaneously, the receive performance, such as image interference and sensitivity, may be reduced. 2 If the two frequencies are the same, the volume may decrease at some VOL control positions. To return to normal operation press the f² key again. 10 Single B[...]

POWER SAVER FEATURES 1 The Battery Saver Mode This transceiver provides a battery saver mode to conserve on battery power. The battery saver circuit activates 10 seconds after the last key is pressed. The squelch must be closed. This function deactivates whenever a key is pressed or the squelch opens. The battery saver does not operate during scann[...]

CLOCK FUNCTION If you press the F key, then the 7 key in receive mode, the clock is displayed on the Sub band display. The time is displayed on a 24-hour basis. If you press the F key, then the 7 key again, the clock is canceled, and the normal frequency display returns. 1 Time Setting 1 Press and hold the F key for longer than one second, then the[...]

Switch-off Timer Setting Timer Start/Stop 1 If you press and hold the F key for longer than one second, then the 9 key, you enter the switch-off timer setting mode, and the TIMER.OFF indicator and the “Hour” display will flash. If you press the F key, then the 8 key, the switch-on timer starts or stops. When the switch-on timer starts, the TIME[...]

56 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 and hold the F key f[...]

POWER ON MESSAGE AND FUNCTION MESSAGE 1 Power On Message When you first switch the POWER on, “TH78A” or “TH78E” appears on the display for two seconds. You can change this factory-set message to your own message as follows: Changing Power-on Message 2 Function Message When you select a function, the corresponding function message is display[...]

EAR Earphone mode MSG M1 MSG MX MSGCLR OPG OFF OPG ON PROGSCN PROGVFO SHIFT SP SPLIT Store receive messages in up to 10 memory channels If more than 10 messages are received, the oldest message are replaced with the new ones Message transmission memory clear Signal squelch ON Canceling signal squelch Programmable scan range setting and recall Progr[...]

MAINTENANCE 1 General Information Your transceiver has been factory aligned and tested to specification before shipment. Under normal circumstances the transceiver will operate in accordance with these instruction manuals. All adjustable trimmers and coils in your transceiver has been adjusted at the factory and should only be readjusted by a quali[...]

TROUBLESHOOTING The following problems are generally caused by improper transceiver operation or connection, not by defective components. If you experience any of these problem causes and corrective actions before requesting service. Symptom Probable Cause Corrective Action Indicators do not light and no 1. Low voltage. 1. Recharge/ replace the bat[...]

ACCESSORIES Note: Some optional accessories may not be available in your area. SPEAKER MICROPHONE SMC-31 SMC-32 SMC-33 SMC-34 HEADSET with VOX/PTT HMC-2 CLIP MICROPHONE with EAR PHONE EMC-l Optional unit Battery charger TSU-7 (CTCSS unit) ME-1 (Memory expansion unit) (Wall charger) BC-15A[...]

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1 Installing the CTCSS Unit (TSU-7) 1 Slide the release button to unlock, then pull out the battery case. 2 Unscrew the four screws on the rear (Fig. 1). The screw near the antenna connector is a short one. 3 Put your finger into the battery holder, and release the claw of the rear case. (Fig. 2) 4 Position the set with its front facing forward. 5 [...]

2 Memory Expansion Unit (ME-l) 1 Slide the release button to unlock, then pull out the battery case. 2 Unscrew the four screws on the rear (Fig. 1). The screw near the antenna connector is a short one. 3 Put your finger into the battery holder, and release the claw of the rear case. (Fig. 2) 4 Position the set with its front facing forward. 5 Open [...]

3 Programming the SMC-33 Remote Control Speaker Microphone VFO MR CALL PTT switch Earphone jack LOCK switch These keys function just like the VFO, MR, and CALL keys on the front panel of the transceiver. To reset the function of the transceiver keys. 1 Connect the SMC-33 to the MIC jack on top of the transceiver. 2 Press and hold Microphone key 1 ([...]

Memory Control Functions Press the key below. Press the F key, then the key below. Tuning control (II) Encoder/Volume selecting mode LAMP LAMP (Turns off 5 seconds after the (Does not turn off automatically) last key operation) MONI TONE TX output power selection MHz VFO Memory shift MR V/M scan CALL V/M/C scan MESSAGE Message function on/off BAND [...]

4 Using Other Microphone If not using the SMC-33, we recommend using an electret type microphone. The input impedance is 2k ohms and the DC voltage on the microphone terminal is approximately 4 volts (Max. 3.5 mA). Do not use a dynamic microphone. Speaker PTT 67[...]

SPECIFICATIONS GENERAL U.S.A. Version FREQUENCY RANGE (MHz) U.K.and Europe 144 to 146 Other market 144 to 148 ANTENNA IMPEDANCE OPERATING TEMPERATURE POWER REQUIREMENTS BATTERY PACK CURRENT DRAIN Transmit mode(13.8VDC) H Transmit mode(13.8VDC) L Transmit mode(13.8VDC) EL SIMPLEX Receive mode with no signal SIMPLEX Battery Save mode DUPLEX Receive m[...]

QUICK REFERENCE Note : The plus symbol (+) means press two keys simultaneously. “then” means press two keys in sequence. “(1 second)” means press the key for longer than one (1) second. TO DO THIS PRESS Temporarily change the volume or frequency of the band that cannot control E.CHG DetermIne if a frequency is in use before transmitting The[...]

Switching speaker output when a external Turn CLOCK function on or off F then 7 Turn switch on timerfunction on or off F then 8 Turn switch off timerfunction on or off F then 9 Activate memory channel lock out function F then 0 Turn KEY LOCK function on or off F then M Turn TX STOP function on or off F then f 2 Select transmit output power level F [...]

TO DO THIS Enter a data into the call channel Message memory buffer clear Enter displayed data in lower limit frequency of programmable VFO tuning limit Enter displayed data in upper limit frequency of programmable VFO tuning limit - - Enter displayed frequency in lower limit frequency of programmable band scan Enter displayed frequency in upper li[...]