Kenwood TH-255A Instruction Manual Download Page 7

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Summary of Contents for TH-255A

Page 1: ...INSTRUCTION MANUAL B62 1981 00 K M 09 08 07 06 05 04 03 02 01 00 144 MHz FM TRANSCEIVER TH 255A ...

Page 2: ...operation 100 memory channels or 50 channels with names Long operation period with a Ni MH battery pack optional Writing Conventions Followed in this Manual The writing conventions described below have been followed to simplify instructions and avoid unnecessary repetition Instruction Action Press KEY Momentarily press KEY Press KEY 1s Press and hold KEY for 1 second or longer Press F KEY Press th...

Page 3: ...not specified by Kenwood If the die cast chassis or other transceiver part is damaged do not touch the damaged parts If a headset or headphone is connected to the transceiver reduce the transceiver volume Pay attention to the volume level when turning the squelch off Do not place the microphone cable around your neck while near machinery that may catch the cable Do not place the transceiver on uns...

Page 4: ...nna terminal or if any metallic parts are exposed from the antenna covering Transmitting at such a time may result in a high frequency burn If an abnormal odor or smoke is detected coming from the transceiver switch the transceiver power off immediately remove the battery pack from the transceiver and contact your Kenwood dealer Use of the transceiver while you are driving may be against traffic l...

Page 5: ... not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that the interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the i...

Page 6: ...t Operation Selection 10 Adjusting the Squelch Level 11 Selecting a Frequency 12 Direct Frequency Entry 13 Transmitting 14 Selecting an Output Power 14 MENU SETUP 15 What is a Menu 15 Menu Access 15 OPERATING THROUGH REPEATERS 18 Repeater Access 19 Activating the Tone Function 20 Selecting a Tone Frequency 21 Tone Frequency ID Scan 22 Automatic Repeater Offset K type only 23 Reverse Function 24 Au...

Page 7: ...l Channel 34 Channel Display Mode 35 SCAN 36 Selecting a Scan Resume Method 37 Band Scan 37 Program Scan 38 Memory Scan 39 Call Scan 40 Priority Scan 40 Memory Channel Lockout 42 SELECTIVE CALL 43 Continuous Tone Coded Squelch System CTCSS 43 Digital Coded Squelch DCS 46 DTMF FUNCTIONS 49 Manual Dialing 49 DTMF TX Hold 50 Automatic Dialer 50 Adjusting the DTMF Tone Transmission Speed 52 Adjusting ...

Page 8: ...r On Message 62 Programmable VFO 63 Time Out Timer 64 TX Inhibit 64 Emergency Siren 65 Minimum Maximum Volume 66 Speaker Attenuation 67 Power On Password 67 OPTIONAL ACCESSORIES 69 MAINTENANCE 70 General Information 70 Service 70 Cleaning 71 Microprocessor Reset 71 Operation Notices 73 Receiving Signals in Cities 73 Transmission 73 Internal Beats 73 TROUBLESHOOTING 74 SPECIFICATIONS 77 ...

Page 9: ...sceiver identify the items listed in the table below We recommend you keep the box and packings for the shipping Item Part Number Quantity Antenna T90 1018 XX 1 Belt clip J29 0623 XX 1 Screw set N99 2066 XX 1 Instruction manual B62 1981 XX 1 Antenna Belt clip Screw set ...

Page 10: ...ry pack 2 Match the guides of the battery pack with the corresponding grooves on the upper rear of the transceiver then firmly press the battery case to lock it in place 3 Flip the safety catch into place to prevent accidentally pressing the release latch and removing the battery pack 4 To remove the battery pack lift the safety catch then press the release latch to unlock the battery pack Lift th...

Page 11: ...or Ni Cd batteries in place of Alkaline batteries Always replace all batteries at the same time Mixing old and new batteries or mixing types such as Alkaline with zinc carbon will reduce overall performance and could cause leakage or rupture Remove all batteries from the case when it is not expected to be in use for several months The voltage of new Alkaline batteries varies slightly depending on ...

Page 12: ...a key ring retainer nor a speaker microphone attachment point Using the antenna in these ways may damage the antenna and degrade your transceiver s performance Installing the Belt Clip If necessary attach the belt clip using the two supplied 3 x 4 mm screws Note If the belt clip is not installed its mounting location may get hot during continuous transmission or when left sitting in a hot environm...

Page 13: ... Keys and Controls GETTING ACQUAINTED SP MIC jack cover Antenna Speaker Microphone Display ...

Page 14: ...t CALL Press CALL to select the Call channel page 34 Press CALL 1s to start Call scan page 40 Press F CALL to store the current operating frequency to the Call channel page 34 y Press POWER to turn the transceiver power ON and OFF u F Press F to enter MHz mode page 12 i VFO Press VFO to enter VFO mode page 12 Press VFO 1s to start Band scan page 37 Press F VFO to copy the current Memory channel or...

Page 15: ...SS frequency setup mode page 44 Press F 5 1s to start CTCSS frequency ID scan page 44 Press 5 1s to turn the Speaker Attenuation function ON and OFF page 67 6 Press F 6 to turn the Priority Scan ON or OFF page 41 7 Press F 7 to turn the Reverse function ON or OFF page 24 Press 7 1s to turn the ASC function ON or OFF page 24 8 Press F 8 to select an Offset direction page 19 9 Press F 9 to turn Memo...

Page 16: ... Attenuation function is ON page 67 Appears when a Priority Scan function is ON page40 Displays the strength of received signals An antenna and all 3 strength bars represents strong signals while the antenna by itself no strength bars represents weak signals Displays the Memory channel and Menu number Displays the operating frequency Memory channel name and Menu Appears when the selected channel i...

Page 17: ...while using Low output power page 14 Appears when the Reverse function is ON page 24 Appears when the ASC function is ON Blinks when the ASC function is performing an OK check page 24 Appears when the F key is pressed Note While the Battery Saver is operating page 55 the indicator may flash when receiving a CTCSS DCS signal which does not match the CTCSS DCS tone code set up in your transceiver ...

Page 18: ...ceiver OFF press POWER again Adjusting the Volume Press UP to increase the audio output level and press DOWN to decrease the output level If you are not receiving a signal press and hold MON to unmute the speaker then adjust the volume control to a comfortable audio output level Volume Adjustment Operation Selection With the setting described below you can adjust the volume using either the UP DOW...

Page 19: ... while actually receiving signals The higher the selected squelch level the stronger the signals must be to receive The appropriate squelch level depends on the ambient RF noise conditions 1 Press F MON The current squelch level appears 2 Rotate the Selector or press UP DOWN to adjust the level Select the level at which the background noise is just eliminated when no signal is present The higher t...

Page 20: ...the desired operating frequency is far away from the current frequency it is quicker to use the MHz Tuning Mode To adjust the MHz digit 1 Press F The MHz digit blinks 2 Rotate the Selector or press UP DOWN to select the desired MHz value 3 After selecting the desired MHz value press F or 0 to exit the MHz Tuning Mode and return to normal VFO Mode 4 Continue adjusting the frequency as necessary usi...

Page 21: ...ts entry Pressing fills all remaining digits the digits you did not enter with 0 and completes the entry For example to select 145 000 MHz press 1 4 and 5 then press to complete the entry If you want to revise the MHz digits only leaving the kHz digits as they are press VFO in place of Note If the entered frequency does not match the current frequency step size the frequency is automatically round...

Page 22: ...time specified in Menu No 12 default is 10 minutes page 64 the internal timeout timer generates a warning beep and the transceiver stops transmitting In this case release PTT and let the transceiver cool down for a while then press PTT again to resume transmission Selecting an Output Power Selecting a lower transmission power is the best way to reduce battery consumption if communication is still ...

Page 23: ...timings settings and programming functions on this transceiver to meet your needs without using many controls and switches Menu Access 1 Press MENU A brief explanation of the Menu and the setting and Menu No appear on the display 2 Rotate the Selector or press UP DOWN to select your desired Menu As you change the Menu No a brief explanation of each Menu appears along with its current parameter 3 P...

Page 24: ...e VFO 136 173 MHz 63 2 OFFSET Repeater Offset Frequency 0 000 29 950 MHz 0 600 20 3 SCAN Scan resume method TO CO SE TO 37 4 M CH Memory channel capacity 50 100 50 26 5 M NAME Memory name 6 characters 32 6 MDF Memory name Frequency display MN FRQ MN 33 7 SAV Battery saver OFF 0 2 0 4 0 6 0 8 1 0 2 0 3 0 4 0 5 0 1 0 55 8 APO Automatic Power OFF OFF 30 60 90 120 180 min 30 54 9 VOLUME Minimum volume...

Page 25: ...wer On message 6 characters 62 16 BP Beep ON OFF ON 57 17 BS Beat Shift ON OFF OFF 56 18 SEL Selector unlock ON OFF OFF 59 19 DTMF MR DTMF memory Automatic dialer Up to 16 digits 50 20 SPD DTMF TX speed FA SL FA 52 21 DT H DTMF TX hold ON OFF OFF 50 22 PA DTMF pause time 100 250 500 750 1000 1500 2000 ms 500 52 23 DT L DTMF key Lock ON OFF OFF 53 24 M PF Microphone PF key ON OFF OFF 60 25 ARO Auto...

Page 26: ... much greater distances by using a repeater Repeaters are typically located on mountain tops or other elevated locations They generally operate at higher ERP Effective Radiated Power than a typical station This combination of elevation and high ERP allows communications over considerable distances OPERATING THROUGH REPEATERS TX 144 725 MHz TX tone 88 5 Hz RX 145 325 MHz TX 144 725 MHz TX tone 88 5...

Page 27: ... your transmit frequency to be higher or lower than the receive frequency Press F 8 to select an offset direction Continually press F 8 to toggle the functions as follows OFF The or icon appears indicating which offset direction is selected If the offset transmission frequency falls outside the allowable range transmission is inhibited In this case adjust the reception frequency so that the transm...

Page 28: ...t frequency value The selectable range is from 0 000 MHz to 29 950 MHz in steps of 50 kHz 3 Press MENU to store the setting 4 Press any key other than MON UP DOWN or to exit Menu mode Note After changing the offset frequency the new offset frequency will also be used by Automatic Repeater Offset K type only Activating the Tone Function Press F 1 to turn the Tone function ON Continually press F 1 t...

Page 29: ...r than MON UP DOWN or to exit the tone frequency selection Note If you have set up a Memory channel with a tone setting simply recall the Memory channel instead of setting up the tone frequency every time Available Tone Frequencies Tone Frequency Hz 67 0 82 5 100 0 123 0 151 4 186 2 225 7 69 3 85 4 103 5 127 3 156 7 192 8 229 1 71 9 88 5 107 2 131 8 162 2 203 5 233 6 74 4 91 5 110 9 136 5 167 9 20...

Page 30: ...e transceiver is receiving a signal during Tone Freq ID Scan the signal is emitted from the speaker To reverse the scan direction rotate the Selector or press UP DOWN When the tone frequency is identified a beep sounds and the identified frequency blinks 2 Press MENU to program the identified frequency in place of the current tone frequency Press any key other than MON UP DOWN or to exit the Scan ...

Page 31: ...ll be transmitting on an offset frequency value determined from your offset setting value page 20 and an offset direction depending on your selected frequency Refer to the settings below for offset directions 4 Press any key other than MON UP DOWN or to exit Menu mode Under 145 100 MHz No offset Simplex operation 145 100 145 499 MHz Minus offset 145 500 145 999 MHz No offset Simplex operation 146 ...

Page 32: ...te If the transmit frequency is outside the allowable transmit frequency range when using Reverse pressing PTT will cause an error tone to sound and transmission will be inhibited If the receive frequency is outside the receive frequency range when using Reverse an error tone will sound and Reverse will not operate The ARO Automatic Repeater Offset will not function when Reverse is ON You cannot s...

Page 33: ...n if you are using simplex operation ASC does not function while scanning Activating ASC while using Reverse will switch the Reverse function OFF If you recall a Memory channel or the Call channel and those channels are set up with the Reverse function switched ON the ASC will switch OFF ASC causes received signals to be momentarily intermitted every 3 seconds ...

Page 34: ...ransceiver must be configured to either 100 memory channels without using the Memory Name function or 50 memory channels with the Memory Name function default To change the memory channel capacity 1 Enter Menu mode and access Menu No 4 M CH 2 Press MENU then rotate the Selector or press UP DOWN to select 50 or 100 3 Press MENU SURE appears 4 Press MENU to accept 5 Press any key other than MON UP D...

Page 35: ...n the operations you have in mind Simplex repeater channels allow Simplex frequency operation Repeater operation with a standard offset if an offset direction is stored Odd split channels allow Repeater operation with a non standard offset The data listed below can be stored in each Memory channel Parameter Simplex Repeater Odd split Receive frequency Yes Yes Transmit frequency Yes Tone ON Yes Yes...

Page 36: ...nnel page 40 are reserved for other functions 4 Rotate the Selector or press UP DOWN to select the memory channel in which you want to store the data 5 Press MR to store the data to the channel Storing Odd Split Repeater Frequencies Some repeaters use a pair of reception and transmission frequencies with a non standard offset If you store two separate frequencies in a memory channel you can operat...

Page 37: ...t memory channel 1 Press PTT MON Power ON to enter Memory Storage mode 2 Press then rotate the Selector or press UP DOWN to select the desired frequency and select related data as required Tone CTCSS DTSS etc Pressing toggles frequency select the MHz dot blinks or channel select the channel number blinks 3 Press again then rotate the Selector or press UP DOWN to select the desired memory channel 4...

Page 38: ...sequentially store in memory channels Turn the transceiver power OFF then ON to exit Continuous Memory Storage mode Note If you use Direct Frequency Entry page 13 to select a frequency in step 2 you need not press You cannot start Storage mode when in Channel Display mode You cannot start Menu mode when in Memory Storage mode Recalling a Memory Channel Using the Selector or UP DOWN keys 1 Press MR...

Page 39: ...it memory channel and appear on the display Press F 7 Reverse function page 24 to display the transmission frequency After recalling a memory channel you may modify data such as Tone or CTCSS However these settings are cleared once you select another channel or the VFO Mode To permanently store the data overwrite the channel contents page 28 Clearing a Memory Channel To clear the data from an indi...

Page 40: ... Name function the memory channel capacity must be set to 50 channels To change the memory channel capacity from 100 to 50 access Menu No 4 M CH 1 Press MR then rotate the Selector or press UP DOWN to select your desired memory channel 2 Enter Menu mode and access Menu No 5 M NAME 3 Press MENU A blinking cursor appears 4 Rotate the Selector or press UP DOWN to select a desired alphanumeric charact...

Page 41: ...You can overwrite stored names by repeating steps 2 to 6 The stored name is erased when you clear the Memory channel data Memory to VFO Transfer Transferring the contents of a Memory channel or the Call channel to the VFO can be useful if you want to search for other stations or a clear frequency near the selected Memory channel or Call channel frequency 1 Press MR or CALL to enter Memory Recall m...

Page 42: ...hannels 0 to 99 the Call Channel cannot be cleared Recalling the Call Channel Press CALL to recall the Call Channel The Call Channel frequency and C appear To return to the previous frequency press CALL again Reprogramming the Call Channel 1 Select your desired frequency and related data Tone CTCSS DCS or offset direction etc When you program the Call Channel as an odd split channel select a recep...

Page 43: ...ays the memory channel number in place of the operating frequencies To recover normal operation turn the transceiver OFF and press PTT MR Power ON again The following transceiver keys cannot be used while in Channel Display mode MENU VFO F then VFO Memory to VFO transfer F then MR Storing Memory channel VFO 1s Band scan 7 1s ASC PTT F Power ON Full reset VFO Power ON VFO reset MR Power ON Clearing...

Page 44: ... Memory channel Priority Scan Checks the activities on the Priority channel Pr every 3 seconds Note When the CTCSS or DCS function is activated the transceiver stops at a busy frequency and decodes the CTCSS tone or DCS code If the tone or code matches the transceiver unmutes Otherwise it resumes scanning Press and hold MON to pause scan in order to monitor the scanning frequency Release MON to re...

Page 45: ...between signal drop out and scan resumption Seek mode SE The transceiver remains on a busy frequency or Memory channel even after the signal drops out and does not automatically resume scanning 1 Enter Menu mode and access Menu No 3 SCAN 2 Press MENU then rotate the Selector or press UP DOWN to select a Scan Resume mode to TO CO or SE 3 Press MENU to store the setting 4 Press any key other than MO...

Page 46: ...e 3 memory channel pairs L0 U0 L2 U2 available for specifying the start and end frequencies Program Scan monitors the range between the start and end frequencies that you have stored in these memory channels Before performing Program Scan store the Program Scan frequency range to one of the memory channel pairs L0 U0 L2 U2 Storing a Program Scan Frequency Range 1 Press VFO then rotate the Selector...

Page 47: ...t Program Scan 3 To stop Program Scan press any key other than MON UP DOWN or Note If you press MON Program Scan temporarily pauses Release MON to resume scanning The transceiver stops scanning when it detects a signal If more than 2 Program Scan channel pairs are stored and overlaps the frequency range among the pairs the smaller Program Scan memory channel number has priority To perform Program ...

Page 48: ...e Call Channel and the selected VFO frequency or memory channel are monitored 4 To stop Call Scan press any key other than MON UP DOWN or Note The transceiver stops scanning when it detects a signal You can perform Call Scan even if the recalled memory channel has been locked out page42 Priority Scan You may sometimes want to check your favorite frequency activities while monitoring other frequenc...

Page 49: ...turn the Priority Scan ON or OFF The icon appears when the Priority Scan is ON Note If a signal is received on a Priority Channel with a CTCSS or DCS code programmed the Priority Channel is recalled only when the programmed tone code matches Press and hold MON to pause Priority Scan when the transceiver is not displaying the Priority Channel Release MON to resume Priority Scan If you clear the Pri...

Page 50: ...UP DOWN to select the memory channel to be locked out 3 Press F 9 to toggle locked out ON and OFF The icon appears below the memory channel number indicating the channel is locked out Note The Program Scan memories L0 U0 L2 U2 Priority Channel Pr cannot be locked out Even if a memory channel is locked out you can perform Call Scan between the Call Channel and the memory channel ...

Page 51: ... be private It only relieves you from listening to unwanted conversations Using CTCSS Press F 1 2 times to turn the CTCSS function ON Continually press F 1 to cycle through the functions as follows Tone ON CTCSS ON DCS ON OFF The icon appears when the CTCSS function is ON Note You cannot use the CTCSS and Tone DCS functions simultaneously Switching the CTCSS function ON after having activated the ...

Page 52: ...one Frequency Hz 67 0 82 5 100 0 123 0 151 4 186 2 225 7 69 3 85 4 103 5 127 3 156 7 192 8 229 1 71 9 88 5 107 2 131 8 162 2 203 5 233 6 74 4 91 5 110 9 136 5 167 9 206 5 241 8 77 0 94 8 114 8 141 3 173 8 210 7 250 3 79 7 97 4 118 8 146 2 179 9 218 1 254 1 CTCSS Frequency ID Scan This function scans through all CTCSS frequencies to identify the incoming CTCSS frequency on the received signal You m...

Page 53: ...appears and blinks 2 Press MENU to program the identified frequency in place of the current CTCSS frequency Press any key other than MON UP DOWN or to exit the Scan function Note Received signals are monitored through the speaker while scanning is in progress CTCSS Frequency ID Scan does not scan the tone if a signal is not detected ...

Page 54: ...ction ON Continually press F 1 to cycle through the functions as follows Tone ON CTCSS ON DCS ON OFF The icon appears when the DCS function is ON Note You cannot use the DCS function and CTCSS Tone functions simultaneously Switching the DCS function ON after having activated the CTCSS Tone functions deactivates the CTCSS Tone functions Selecting a DCS Code 1 Press F 4 The current DCS code appears ...

Page 55: ... 532 546 565 606 612 624 627 631 632 654 662 664 703 712 723 731 732 734 743 754 DCS Code ID Scan This function scans through all DCS codes to identify the incoming DCS code on the received signal You may find this useful when you cannot recall the DCS code that the other persons in your group are using 1 Press F 4 1s to start the DCS code ID scan While scanning the decimal point between DCS and t...

Page 56: ...in place of the current DCS code Press any key other than MON UP DOWN or to exit the Scan function Note Received signals are monitored through the speaker while scanning is in progress DCS Code ID Scan does not scan the code if a signal is not detected ...

Page 57: ...ing follow the steps below 1 Press and hold PTT to transmit 2 While transmitting press the keys in sequence on the keypad to send the DTMF tones The corresponding DTMF tones are transmitted and monitored through the speaker Frequency Hz 1209 1366 1477 1633 697 1 2 3 A 770 4 5 6 B 852 7 8 9 C 941 0 D When DTMF TX Hold is ON you do not need to continuously press PTT to remain in Transmission Mode Ho...

Page 58: ... 4 Press any key other than MON UP DOWN or to exit Menu mode Automatic Dialer If you use the 10 dedicated memory channels to store DTMF codes you do not need to remember a long string of digits Storing a DTMF Code in Memory 1 Enter Menu mode and access Menu No 19 DTMF MR 2 Press MENU then rotate the Selector or press UP DOWN to select your desired DTMF memory channel number from 0 to 9 3 Press MEN...

Page 59: ...hout transmitting 8 Press any key other than MON UP DOWN or to exit Menu mode Transmitting a Stored DTMF Code 1 While pressing and holding PTT press MENU 2 Release MENU continue pressing PTT then rotate the Selector or press UP DOWN to select the desired DTMF memory channel number 3 While still holding PTT press MENU again to transmit the selected DTMF tones The code stored in the channel scrolls ...

Page 60: ... press UP DOWN to select FA Fast or SL Slow The tone duration of FAST is 50 ms and SLOW is 100 ms FA Fast is the default setting 3 Press MENU to store the setting 4 Press any key other than MON UP DOWN or to exit Menu mode Adjusting the Pause Duration You can change the pause duration a space digit stored in memory channels The default setting is 500 milliseconds 1 Enter Menu mode and access Menu ...

Page 61: ...ag you sometimes may want to disable the keypad to avoid accidental DTMF transmission In this case turn the DTMF Lock function ON 1 Enter Menu mode and access Menu No 23 DT L 2 Press MENU then rotate the Selector or press UP DOWN to select ON 3 Press MENU to store the setting 4 Press any key other than MON UP DOWN or to exit Menu mode ...

Page 62: ...e the Selector or press UP DOWN to select the APO time 3 Press MENU to store the setting 4 Press any key other than MON UP DOWN or to exit Menu mode Note APO does not function while the transceiver is scanning The APO timer starts counting down the time when no key presses no control adjustments The APO warning beep sounds and APO appears 1 minute before the transceiver turns OFF The APO warning b...

Page 63: ...owing cyclic conditions TX RX Stand by 5 5 90 We recommend you carry extra battery packs with you in case the battery pack becomes discharged Battery Type Output Power Operating Time Hours Approx PB 43N 7 2 V High 8 Low 15 BT 14 9 0 V High 8 Low 15 Battery Saver The Battery Saver extends the operating time of the transceiver It automatically activates when the squelch is closed and no key is press...

Page 64: ...g reception the battery saver function is turned OFF Battery Saver does not function while scanning Beat Shift Since the transceiver uses a microprocessor to control various functions of the transceiver the CPU clock oscillator s harmonics or image may appear on some spots of the reception frequencies page 73 In this case turn the Beat Shift function ON 1 Enter Menu mode and access Menu No 17 BS 2...

Page 65: ...Press any key other than MON UP DOWN or to exit Menu mode The transceiver generates the following warning beeps even if the beep function is turned OFF APO warning beeps Time Out Timer warning beep Note The beep output level is linked to the volume control position Busy Channel Lockout This function is used in order to prevent transmitting on a channel or frequency that somebody else is currently ...

Page 66: ...elector or press UP DOWN to select your desired frequency step size 3 Press any key other than MON UP DOWN or to exit the frequency step size selection Note If you change to a frequency step size that does not match the current operating frequency the transceiver automatically adjusts the frequency to match the new frequency step size Back Light To illuminate the display Press If no other key is p...

Page 67: ...nd microphone PF key 2 Press F MENU to unlock the keys Note You cannot perform the Microprocessor Reset page 71 while the Lock function is ON Selector Unlock While the Lock function is ON you sometimes may want to rotate the Selector or press UP DOWN to change the frequency In this case turn the Selector unlock function ON 1 Enter Menu mode and access Menu No 18 SEL 2 Press MENU then rotate the Se...

Page 68: ... the microphone are programmable with transceiver functions The microphone key default assignments are as follows Mic 1 VFO Mic 2 MR Mic 3 CALL Note Turn the transceiver OFF before connecting the optional speaker microphone While Menu No 24 M PF is OFF or the Lock function is ON you cannot program PF keys If the LOCK switch on the rear of the microphone is ON you must move the switch to the OFF po...

Page 69: ... 7 Reverse 8 Recalling CH 8 Offset direction 9 Recalling CH 9 Channel lock out 0 Recalling CH 0 Back light On To keep the light ON 2 Direct entry Volume adjustment operation selection PTT VFO MR Transmit power Selector Volume or Function Up or Down 1 REMO 1 3 REMO 3 REMO 1 REMO 3 REMO 1 REMO 3 1 After saving a function to a microphone PF key changing the volume adjustment operation selection setti...

Page 70: ...n 1 Press and hold MON The speaker is unmuted and you can monitor the signals 2 Release MON to return to normal operation Power On Message You can change the Power ON Message a maximum of 6 characters when the transceiver is turned ON 1 Enter Menu mode and access Menu No 15 P ON MSG 2 Press MENU A blinking cursor appears 3 Rotate the Selector or press UP DOWN to select a character You can enter th...

Page 71: ... the upper limit the tunable range will be limited from 144 000 MHz to 145 995 MHz 1 Press VFO 2 Enter Menu mode and access Menu No 1 P VFO 3 Press MENU The current programmable frequency range for the band appears 4 Rotate the Selector or press UP DOWN to select the lower limit frequency in MHz 5 Press MENU to store the lower limit frequency The upper limit frequency blinks 6 Rotate the Selector ...

Page 72: ... transceiver from thermal damage and can therefore not be turned OFF 1 Enter Menu mode and access Menu No 12 TOT 2 Press MENU then rotate the Selector or press UP DOWN to select 3 5 or 10 3 Press MENU to store the setting 4 Press any key other than MON UP DOWN or to exit Menu mode Note A warning beep sounds even if you set Menu No 16 BP to OFF TX Inhibit You can inhibit the transmission to prevent...

Page 73: ...lume level 1 Enter Menu mode and access Menu No 11 EMG 2 Press MENU then rotate the Selector or press UP DOWN to select OFF VOL MED or MAX OFF The Emergency siren does not sound VOL The Emergency siren sounds at the same level as the current volume setting MED The Emergency siren sounds using volume level 8 no matter what the current volume level setting is MAX The Emergency siren sounds using vol...

Page 74: ...e Emergency siren will continue to sound until it has been turned OFF When using an earphone or headset do not turn the Emergency Siren function ON Minimum Maximum Volume The transceiver retains the same volume level when the Volume control is turned to the lowest limit Maximum Volume level allows you to limit the volume level to be no higher than the configured level even if a user attempts to in...

Page 75: ...pproximately 10 dB 1 Press 5 1s to turn the Speaker Attenuation function ON The icon appears when the Speaker Attenuation function is ON 2 Press PTT or 5 1s to turn the Speaker Attenuation function OFF Power On Password If power on password is activated you cannot operate the transceiver without first entering your password after turning the transceiver power ON The password can contain up to 6 di...

Page 76: ...o 10 PASSWD 6 Press MENU to confirm the password 7 Press any key other than MON UP DOWN or to exit Menu mode When turning the transceiver power ON while the Password function is programmed PASSWD appears on the display You must enter the password to unlock the transceiver To enter the password 1 Press the 0 9 keys corresponding to the password Press CALL to delete an incorrect character 2 Press ME...

Page 77: ...Speaker microphone SMC 34 Speaker microphone HMC 3 Headset HMC 4 Headset KHS 21 Headset EMC 3 Clip microphone HS 9 Earphone KSC 24 Rapid Charger Note Optional accessories for use with this transceiver may change post production New options may become available and or current options may be discontinued Please refer to the options catalog s for applicable transceivers ...

Page 78: ...you feel they are directly related to the service problem You may return this product for service to the authorized Kenwood dealer from whom you purchased it or any authorized Kenwood service center Please do not send subassemblies or printed circuit boards send the complete product A copy of the service report will be returned with the product Service Note If you desire to correspond on a technic...

Page 79: ...ms to be malfunctioning resetting the microprocessor may solve the problem The following 2 reset Modes are available When performing the reset you may lose memory data and stored information Write down important data before performing the reset VFO Reset This resets the transceiver parameters excluding the stored DTMF Numbers in Memory page 50 and memory channel contents Full Reset This resets all...

Page 80: ...set Mode 3 Press VFO to reset the transceiver Full Reset When the transceiver is turned OFF 1 Press PTT F Power ON The full reset confirmation message FL RST appears 2 Press F to proceed SURE appears Press any key other than or F to exit the Reset Mode 3 Press F to reset the transceiver ...

Page 81: ...overloaded by strong interference signals that are nearby Transmission If you continuously transmit for more than 8 minutes at high power 5 W the transceiver becomes warm If you continue or repeat the transmission before the transceiver cools down the thermal protector gradually decreases the output power down to 1 5 W Internal Beats On some spots of the frequency the antenna indicator moves witho...

Page 82: ...ransceiver is in Channel Display Mode Press PTT MR Power ON to exit Channel Display Mode You cannot recall any memory channel You have stored no data in any of the memory channels Store the desired frequencies in the memory channels You cannot select the exact desired frequency using the selector The current frequency step size does not allow the frequency to be selected Select an appropriate freq...

Page 83: ...t frequency TX inhibit is ON Access Menu No 14 TXI and select OFF The battery pack voltage is too low to transmit Change or replace the battery Repeater cannot be accessed Wrong tone frequency is selected Select a proper repeater access tone Wrong repeater offset frequency is selected Access Menu No 2 OFFSET and select an appropriate offset frequency Wrong offset direction is selected Try other of...

Page 84: ...ring a long transmission The transmission time exceeded the programmed TOT time Access Menu No 12 TOT to select your desired transmission length The TOT cannot be turned OFF protecting the transceiver from the thermal damage The Scan function does not resume scanning after the transceiver detects a signal You have selected SE SEEK for Menu No 3 SCAN Select either TO Time Operated or CO Carrier Ope...

Page 85: ...MHz RX 136 174 MHz Mode F3E Antenna impedance 50 Ω Operating temperature range 10 C 50 C 14 F 122 F Operating Voltage DC 6 0 9 0 V 7 5 V nominal Frequency stability Within 5 ppm Dimensions W x H x D include projections 58 0 x 129 7 x 37 8 mm 2 9 32 x 5 3 32 x 1 31 64 inches with PB 43N 58 0 x 129 7 x 39 0 mm 2 9 32 x 5 3 32 x 1 1 2 inches with BT 14 Weight approx Included antenna Belt clip and Bat...

Page 86: ...ansmitter RF output power approx High 5 5 W Low 0 5 W Modulation Reactance modulation Maximum frequency deviation Within 5 kHz Spurious emission Less than 60 dB Modulation distortion 300 Hz 3 kHz Less than 3 ...

Page 87: ...odyne Intermediate Frequency IF 1st IF 38 85 MHz 2nd IF 450 kHz Sensitivity 12 dB SINAD Less than 0 18 µV Squelch sensitivity Less than 0 13 µV Selectivity 6 dB More than 10 kHz 40 dB Less than 28 kHz Audio output 10 distortion More than 400 mW ...

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Kenwood TH-255A, Instruction Manual

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