Kenwood TM-281A User Manual

Kenwood TM-281A Manual

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  • Kenwood TM-281A | User Manual - Page 1
    TM-281A/ TM-481A 144 MHz FM TRANSCEIVER 430 MHz FM TRANSCEIVER INSTRUCTION MANUAL 144 MHz FM 430 MHz FM © B62-2348-20 (M,M3) 09 08 07 06 05 04 03 02
  • Kenwood TM-281A | User Manual - Page 2
    ENGLISH INSTRUCTION MANUAL 144 MHz FM TRANSCEIVER TM-281A 430 MHz FM TRANSCEIVER TM-481A
  • Kenwood TM-281A | User Manual - Page 3
    covered by this manual. TM-281A: 144 MHz FM Transceiver TM-481A: 430 MHz FM Transceiver The frequency indication examples in this instruction manual are provided for the TM-281A (VHF model). Therefore, the actual operation frequencies will not match when operating the TM-481A (UHF model). MARKET
  • Kenwood TM-281A | User Manual - Page 4
    . • Do not modify the transceiver unless instructed by this manual or other Kenwood documentation. • Do not expose the transceiver detected coming from the transceiver, turn OFF the power immediately. Contact a Kenwood service station or your dealer. • This transceiver is designed for a 13.8
  • Kenwood TM-281A | User Manual - Page 5
    CONTENTS SUPPLIED ACCESSORIES 1 WRITING CONVENTIONS FOLLOWED IN THIS MANUAL 1 CHAPTER 1 PREPARATION MOBILE INSTALLATION 2 DC POWER CABLE CONNECTION 3 Mobile Operation 3 Fixed Station Operation 4 Replacing Fuses 5 ANTENNA CONNECTION 5 ACCESSORY CONNECTIONS 6 External Speaker 6 Microphone
  • Kenwood TM-281A | User Manual - Page 6
    FREQUENCY ID SCAN 45 1 DCS 46 SELECTING A DCS CODE 46 2 DCS CODE ID SCAN 47 CHAPTER 10 DUAL TONE MULTI-FREQUENCY 3 (DTMF) FUNCTIONS MANUAL DIALING 48 4 DTMF MONITOR 48 DTMF TX HOLD 49 5 AUTOMATIC DIALER 49 STORING A DTMF NUMBER IN MEMORY 49 6 CONFIRMING STORED DTMF NUMBERS 50
  • Kenwood TM-281A | User Manual - Page 7
    12 MICROPHONE CONTROL MIC LOCK 62 CHAPTER 13 OPTIONAL ACCESSORIES CHAPTER 14 TROUBLESHOOTING MAINTENANCE 64 GENERAL INFORMATION 64 SERVICE 64 SERVICE NOTE 64 CLEANING 65 RESETTING THE TRANSCEIVER 65 INITIAL SETTINGS 65 FULL RESET 65 VFO RESET 66 TROUBLESHOOTING 67 SPECIFICATIONS INDEX iv
  • Kenwood TM-281A | User Manual - Page 8
    1 Mounting bracket 1 Screw set 1 Microphone hanger 1 Instruction manual 1 WRITING CONVENTIONS FOLLOWED IN THIS MANUAL The writing conventions described below have been followed to simplify instructions and avoid unnecessary repetition. Instruction Press [KEY]. Press [KEY] (1s). Press [KEY1
  • Kenwood TM-281A | User Manual - Page 9
    PREPARATION 1 MOBILE INSTALLATION To install the transceiver, select a safe, convenient location inside your vehicle that minimizes danger to your passengers and yourself while the vehicle is in motion. Consider installing the unit at an appropriate position so that knees or legs will not strike it
  • Kenwood TM-281A | User Manual - Page 10
    DC POWER CABLE CONNECTION Locate the power input connector as close to the transceiver as possible. MOBILE OPERATION The vehicle battery must have a nominal rating of 12 V. Never connect the transceiver to a 24 V battery. Be sure to use a 12 V vehicle battery that has sufficient current capacity. If
  • Kenwood TM-281A | User Manual - Page 11
    FIXED STATION OPERATION In order to use this transceiver for fixed station operation, 1 you will need a separate 13.8 V DC power supply (not included). The recommended current capacity of your power supply is 14 A or more. 1 Connect the DC power cable to the regulated DC power supply and ensure that
  • Kenwood TM-281A | User Manual - Page 12
    blows, determine the cause, then correct the problem. After the problem is resolved, replace the fuse. If newly installed fuses continue to blow, disconnect the power cable and contact your authorized Kenwood dealer or an authorized Kenwood service center for assistance. Fuse Location Transceiver
  • Kenwood TM-281A | User Manual - Page 13
    ACCESSORY CONNECTIONS EXTERNAL SPEAKER 1 If you plan to use an external speaker, choose a speaker with an impedance of 8 Ω. The external speaker jack accepts a 3.5 mm (1/8") mono (2-conductor) plug. We recommend using the SP-50B speaker. MICROPHONE For voice communications, connect a 600 Ω
  • Kenwood TM-281A | User Manual - Page 14
    to your PC using an optional Programming Cable (via the microphone jack). The MCP-1A is free downloadable software available from Kenwood at the following URL: http://www.kenwood.com/i/products/info/amateur/software_download.html Note: Ask your dealer about purchasing a Programming Cable. 1 7
  • Kenwood TM-281A | User Manual - Page 15
    on the air right away. The instructions below are intended only as a quick guide. If you encounter problems or there is something you would like to know more, read the detailed explanations given later in this manual. 12
  • Kenwood TM-281A | User Manual - Page 16
    the main functions of the front panel controls. Explanations for functions not described here are provided in the appropriate sections of this instruction manual. : @ .;=B> q (Power) switch/ Volume control Press to switch the transceiver power ON or OFF {page 14}. Turn to adjust the level of the
  • Kenwood TM-281A | User Manual - Page 17
    In MR Mode, press [F] then press [VFO] to transfer the contents of the selected Memory Channel to the VFO {page 33}. t MR key Press to enter Memory Recall Mode {page 30}. In this mode, you can change memory channels using the 3 Tuning control or Mic [UP]/[DWN]. Press and hold for 1 second while in
  • Kenwood TM-281A | User Manual - Page 18
    6 Appears when the Automatic Simplex Check (ASC) function is activated {page 26}. 7 Appears when the Priority Scan function is activated {page 42}. 8 "WX" is not used on this transceiver. 9 Appears when narrow FM Mode is selected {page 58}. 10 Displays the frequencies, Menu settings, Memory name and
  • Kenwood TM-281A | User Manual - Page 19
    REAR PANEL : @ . 3 q Antenna connector Connect an external antenna {page 5} here. When making test transmissions, connect a dummy load in place of the antenna. The antenna system or load should have an impedance of 50 Ω. w Power Input 13.8 V DC cable Connect a 13.8 V DC power source here. Use the
  • Kenwood TM-281A | User Manual - Page 20
    keypad to select a frequency {page 16} or Memory Channel number {page 30}. First press the Mic PF key assigned the 3 ENTER function {page 57}. To manually send a DTMF number, press and hold Mic [PTT], then press the DTMF keys on the Mic keypad {page 48} in sequence. You can also use
  • Kenwood TM-281A | User Manual - Page 21
    OPERATING BASICS SWITCHING THE POWER ON/OFF 1 Press [ ] (Power) to switch the transceiver power ON. • A high pitched double beep sounds and a Power-on message {page 58} appears briefly, followed by the frequency and other indicators. 4 ADJUSTING THE SQUELCH The purpose of Squelch is to mute the
  • Kenwood TM-281A | User Manual - Page 22
    TRANSMITTING 1 To transmit, hold the microphone approximately 5 cm (2 inches) from your mouth, then press and hold Mic [PTT] and speak into the microphone in your normal tone of voice. • " " and the RF Power meter appears. The RF Power meter shows the relative transmit output power ( ). • If
  • Kenwood TM-281A | User Manual - Page 23
    MHZ MODE If 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 While in VFO or Call Mode, press [MENU]. • The MHz digit blinks. 4 DIRECT FREQUENCY ENTRY In addition to turning the Tuning control or pressing
  • Kenwood TM-281A | User Manual - Page 24
    Example 1 To enter 145.750 MHz: Key in Display [Enter] --- --- [1], [4], [5] 1 4 5. - - - [7], [5], [0] 1 4 5. 7 5 0 Example 2 To enter 145.000 MHz: Key in Display [Enter] --- --- [1], [4], [5] 1 4 5. - - - [Enter] 1 4 5. 0 0 0 Example 3 To change 144.650 MHz to 145.650 MHz: Key
  • Kenwood TM-281A | User Manual - Page 25
    MENU SETUP WHAT IS A MENU? Many functions on this transceiver are selected or configured via a software-controlled Menu rather than through the physical controls of the transceiver. Once you become familiar with the Menu system, you will appreciate its versatility. You can customize the various
  • Kenwood TM-281A | User Manual - Page 26
    54 67.0 ~ 254.1 kHz 88.5 24 67.0 ~ 254.1 kHz 88.5 45 023 ~ 754 023 46 OFF/ +/ − High/ Low OFF High 23 5 15 TM-281A: 136 ~ 174 MHz TM-481A: 400 ~ 470 MHz TM-281A:136 ~ 174 MHz TM-481A:400 ~ 470 MHz 59 ON/ OFF OFF 52 OFF/ 125/ 250/ 500 m OFF 53 0 ~ 69.95 MHz
  • Kenwood TM-281A | User Manual - Page 27
    On the display Menu No. Function CK 19 CALL key HLD TOT BCL 5 P.ON.MSG BP BS FMN ENC DTMF.MR SPD DT.H PA DT.L DT.M MC.L 20 1750 Hz tone TX hold 21 Time-out Timer 22 Busy Channel Lockout 23 Power-on message 24 Beep 25 Beat Shift 26 Narrow FM 27 Tuning control lock 28 Automatic dialer 29 DTMF TX
  • Kenwood TM-281A | User Manual - Page 28
    On the display PF2 PF3 PF4 BRIGHT ABR RESET Menu No. Function Selections Default Ref Page MONI/ ENTER/ 1750/ VFO/ MR/ CALL/ 36 Microphone programmable function key MHZ/ REV/ SQL/ M--V/ M.IN/ C.IN/ MENU/ SHIFT/ LOW/ BRIGHT/ LOCK/ MR 57 TONE/ STEP 37 Microphone programmable function key
  • Kenwood TM-281A | User Manual - Page 29
    OPERATING THROUGH REPEATERS Repeaters, which are often installed and maintained by radio clubs, are usually 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
  • Kenwood TM-281A | User Manual - Page 30
    PROGRAMMING AN OFFSET You must first select an amateur radio repeater downlink frequency as described in "SELECTING AN OFFSET FREQUENCY". SELECTING AN OFFSET DIRECTION Select whether the transmit frequency will be higher (+) or lower (-) than the receive frequency. 1 Press [F], [MENU] and turn the
  • Kenwood TM-281A | User Manual - Page 31
    ACTIVATING THE TONE FUNCTION To activate Tone, press [F], [CALL]. • As you press [F], [CALL], the selection cycles as follows: "OFF" ➞ "TONE" ➞ "CTCSS" ➞ "DCS" ➞ "OFF". • "T" appears on the upper part of the display, indicating that the Tone function is activated. Note: You cannot use the Tone
  • Kenwood TM-281A | User Manual - Page 32
    AUTOMATIC REPEATER OFFSET This function automatically selects an offset direction, according to the frequency on the VHF band. The transceiver is programmed for an offset direction as shown below. To obtain an up-to-date band plan for repeater offset direction, contact your national Amateur Radio
  • Kenwood TM-281A | User Manual - Page 33
    REVERSE FUNCTION The reverse function exchanges a separate reception and transmission frequency. So, while using a repeater, you can manually check the strength of a signal that you receive directly from the other station. If the station's signal is strong, both stations should move to a simplex
  • Kenwood TM-281A | User Manual - Page 34
    Note: ◆ Pressing [PTT] causes the " " icon to quit blinking. ◆ ASC can be activated while operating in Simplex Mode. However, it does not change the Transmission/Reception frequencies. ◆ ASC does not function while scanning. ◆ Activating ASC while using Reverse switches Reverse OFF. ◆ If you recall
  • Kenwood TM-281A | User Manual - Page 35
    MEMORY CHANNELS In Memory Channels, you can store frequencies and related data that you frequently use so that you do not need to reprogram that data every time. You can quickly recall a programmed channel through simple operation. A total of 200 Memory Channels (100 when using the Memory Name
  • Kenwood TM-281A | User Manual - Page 36
    The data listed below can be stored in each Memory Channel: Parameter Receive frequency Transmit frequency Tone frequency Tone ON CTCSS frequency CTCSS ON DCS code DCS ON Offset direction Offset frequency Reverse ON Frequency step size Narrow band FM Beat Shift Memory Channel lockout Memory Channel
  • Kenwood TM-281A | User Manual - Page 37
    • Memory Channel numbers L0/U0 ~ L2/U2 {page 38}, Pr {page 41} are reserved for other functions. 5 Turn the Tuning control or press Mic [UP]/[DWN] to select the Memory Channel in which you want to store the data. 6 Press [MR] to store the data to the channel. STORING ODD-SPLIT REPEATER FREQUENCIES
  • Kenwood TM-281A | User Manual - Page 38
    USING THE MICROPHONE KEYPAD You can also recall a Memory Channel by entering a desired Memory Channel number with the microphone keypad. 1 Press [MR] to enter Memory Recall mode. 2 Press the microphone key assigned the ENTER function. 3 Enter the channel number using the microphone keypad. • For
  • Kenwood TM-281A | User Manual - Page 39
    NAMING A MEMORY CHANNEL You can name Memory Channels using up to 6 alphanumeric characters. When you recall a named Memory Channel, its name appears on the display in place of the stored frequency. Names can be call signs, repeater names, cities, names of people, etc. In order to use the Memory Name
  • Kenwood TM-281A | User Manual - Page 40
    MEMORY CHANNEL TRANSFER MEMORY \ VFO TRANSFER After retrieving frequencies and associated data from Memory Recall Mode, you can copy the data to the VFO. This function is useful, for example, when the frequency you want to monitor is near the frequency stored in a Memory Channel. 1 Press [MR], then
  • Kenwood TM-281A | User Manual - Page 41
    The tables below illustrate how data is transferred between Memory Channels. Channel 01 ~ 199 ∆ Channel 01 ~ 199 Receive frequency ∆ Receive frequency Transmit frequency ∆ Transmit frequency Tone frequency ∆ Tone frequency Offset direction ∆ Offset direction CTCSS frequency ∆ CTCSS
  • Kenwood TM-281A | User Manual - Page 42
    emergency channel within your group. In this case, Call Scan {page 41} will be useful. The default Call Channel frequency is as follows; TM-281A: 144.000 MHz TM-481A: 440.000 MHz Note: Unlike Memory Channels 0 to 199, the Call Channel cannot be cleared. RECALLING THE CALL CHANNEL 1 Press [CALL] to
  • Kenwood TM-281A | User Manual - Page 43
    CHANNEL DISPLAY While in this mode, the transceiver displays only Memory Channel numbers (or Memory Names if they have been stored), instead of frequencies. 1 With the transceiver power OFF, press [REV]+[ ] (Power) to turn the power ON. • The transceiver displays the Memory Channel numbers in place
  • Kenwood TM-281A | User Manual - Page 44
    SCAN Scan is a useful function for hands-off monitoring of your favorite frequencies. By becoming comfortable with all types of scan, you will increase your operating efficiency. This transceiver provides the following types of scans. Sca Type Purpose Band Scan Scans the entire band of the
  • Kenwood TM-281A | User Manual - Page 45
    and receiving at 144.525 MHz, it scans all the frequencies available for the VHF band. (Refer to receiver VFO frequency range in the specifications {page 70}.) When the current VFO receive frequency is outside the Program Scan frequency range {below}, the transceiver scans the entire frequency range
  • Kenwood TM-281A | User Manual - Page 46
    7 Turn the Tuning control or press Mic [UP]/[DWN] to select a matching Memory Channel from U0 ~ U2. • For example, if you have selected "L0" in step 3, select Memory Channel "U0". 8 Press [MR] to store the end frequency in the Memory Channel. ■ Performing Program Scan 1 Press [VFO] and turn the
  • Kenwood TM-281A | User Manual - Page 47
    MEMORY SCAN Memory Scan monitors Memory Channels in which you have stored frequencies. ALL-CHANNEL SCAN The transceiver scans all of the Memory Channels in which you have stored frequencies. 1 Press [MR] (1s). • Scan starts from the last Memory Channel number and ascends up through the channel
  • Kenwood TM-281A | User Manual - Page 48
    CALL SCAN You can alternate between monitoring the Call Channel and the current operating frequency. 1 Select the frequency (in VFO or Memory Recall Mode) you want to monitor. • In VFO Mode, turn the Tuning control or press Mic [UP]/[DWN] to select the desired frequency. • In Memory Recall Mode,
  • Kenwood TM-281A | User Manual - Page 49
    USING PRIORITY SCAN 1 Press [F], [MENU] and turn the Tuning control to select Menu No. 12 (PRI). 2 Press [MENU] and turn the Tuning control to select "ON" or "OFF" (default). 3 Press [MENU] to store the setting or any other key to cancel. • "PRI" appears. MEMORY CHANNEL LOCKOUT You can lock out
  • Kenwood TM-281A | User Manual - Page 50
    SCAN RESUME METHOD The transceiver stops scanning at the frequency (or Memory Channel) where a signal is detected. It then continues or stops scanning according to which Resume Mode you have selected. • Time-Operated Mode (default) The transceiver remains on a busy frequency (or Memory Channel) for
  • Kenwood TM-281A | User Manual - Page 51
    AND DCS You may sometimes want to hear calls from only specific persons or groups. In this case, use Selective Call. frequency portions may cause CTCSS to function incorrectly. To prevent noise from causing this problem, select an appropriate squelch level {page 14}. ◆ While transmitting the 1750 Hz
  • Kenwood TM-281A | User Manual - Page 52
    SELECTING A CTCSS FREQUENCY 1 Press [F], [MENU] and turn the Tuning control or press Mic [UP]/[DWN] to select Menu No. 3 (CT). • The current CTCSS frequency appears. 2 Press [MENU] and turn the Tuning control to select your desired CTCSS frequency. • The selectable CTCSS frequencies are the same as
  • Kenwood TM-281A | User Manual - Page 53
    • While scanning, the decimal point of the CTCSS frequency blinks. • To reverse the scan direction, turn the Tuning control or press Mic [UP]/[DWN]. • To quit the function, press any key. • When a CTCSS frequency is identified, the identified frequency appears and blinks. 3 Press [MENU] to program
  • Kenwood TM-281A | User Manual - Page 54
    • The available DCS codes are shown in the following table. 104 DCS Codes 023 065 132 205 255 331 413 465 612 731 025 071 134 212 261 332 423 466 624 732 026 072 143 223 263 343 431 503 627 734 031 073 145 225 265 346 432 506 631 743 032 074 152 226 266 351 445 516 632 754 036 114 155 243 271 356
  • Kenwood TM-281A | User Manual - Page 55
    speed dialing. Many repeaters in the U.S.A. and Canada offer a service called Autopatch. You can access the public telephone network via such on a push-button telephone plus 4 additional keys (A, B, C, D). To perform Manual Dialing, follow the steps below. 1 Press and hold Mic [PTT] to transmit.
  • Kenwood TM-281A | User Manual - Page 56
    DTMF TX HOLD This function causes the transceiver to remain in transmission mode for 2 seconds after you release each key. So, you can release Mic [PTT] while sending DTMF tones. 1 Press [F], [MENU] and turn the Tuning control to select Menu No. 30 (DT.H). 2 Press [MENU] and turn the Tuning control
  • Kenwood TM-281A | User Manual - Page 57
    6 Repeat steps 4 and 5 to enter up to 16 digits. 7 Press [MENU] to complete the entry. • Press any key other than [MR], [VFO], [F], and [MENU] to cancel the entry. • To complete an entry of less than 16 digits, press [MENU] two times. 8 Press any key other than [MENU] to exit Menu Mode. CONFIRMING
  • Kenwood TM-281A | User Manual - Page 58
    ADJUSTING THE PAUSE DURATION You can change the pause duration (a space digit) stored in Memory Channels. The default setting is 500 milliseconds. 1 Press [F], [MENU] and turn the Tuning control to select Menu No. 31 (PA). 2 Press [MENU] and turn the Tuning control to select 100, 250, 500 (default),
  • Kenwood TM-281A | User Manual - Page 59
    AUXILIARY FUNCTIONS APO (AUTO POWER OFF) The transceiver switches OFF automatically if no keys or controls are pressed or adjusted for the selected duration. One minute before the transceiver switches OFF, warning beeps sound for a few seconds and "APO" blinks. You can select the APO time from OFF
  • Kenwood TM-281A | User Manual - Page 60
    1 Press [F], [MENU] and turn the Tuning control to select Menu No. 8 (SSQ). 2 Press [MENU] and turn the Tuning control to select "ON" or "OFF" (default). 2 Press [MENU] and turn the Tuning control to select from OFF (default), 125, 250, and 500 ms. 3 Press [MENU] to store the setting. • The S-
  • Kenwood TM-281A | User Manual - Page 61
    essential in selecting your exact receive frequency using the Tuning control or Mic [UP]/[DWN]. You can select your desired frequency step size from: 2.5 kHz (TM-281A Only), 5 kHz, 6.25 kHz, 10 kHz, 12.5 kHz, 15 kHz, 20 kHz, 25 kHz, 30 kHz, 50 kHz, 100 kHz. To change the frequency
  • Kenwood TM-281A | User Manual - Page 62
    each model is as follows: Market Code Default Frequency Step Size TM-281A ( M3 ) 12.5 kHz TM-481A ( M ) 25 kHz Note: The market code is printed on the barcode label of the carton box. DISPLAY BACKLIGHT You can manually change the display brightness to match the lighting conditions where you
  • Kenwood TM-281A | User Manual - Page 63
    LOCK FUNCTION The lock function disables most of the keys to prevent you from accidentally activating a function. Transceiver Lock is suitable for a typical mobile installation where you select most operations using the microphone. 1 Press [F] (1s). • " " appears when this function is ON. TUNE
  • Kenwood TM-281A | User Manual - Page 64
    MICROPHONE PF KEYS (KEYPAD MODELS ONLY) You can access many transceiver settings without using transceiver keys or controls. Microphone keys PF/D, MR/C, VFO/B, and CALL/A are programmable with transceiver functions. The microphone key default assignments are as follows: Mic PF1 key [PF/D]: 1 MHz
  • Kenwood TM-281A | User Manual - Page 65
    NARROW BAND FM OPERATION By default, the transceiver operates in normal FM (±5 kHz) mode for both transmission and reception. You can also operate the transceiver in narrow band FM (±2.5 kHz). To operate the transceiver in narrow band FM: 1 Press [F], [MENU] and turn the Tuning control to select
  • Kenwood TM-281A | User Manual - Page 66
    6 Press [MENU] to complete the setting and store the Power-on message. 7 Press any key other than [MENU] to exit Menu Mode. Note: If a Power-on message is not set, the transceiver model name appears when the transceiver power is turned ON. PROGRAMMABLE VFO To limit the operating frequencies within a
  • Kenwood TM-281A | User Manual - Page 67
    TIME-OUT TIMER The Time-out Timer limits the time of each transmission to a maximum of 3, 5, or 10 (default) minutes. Just before the transceiver stops the transmission, a warning beep sounds. This function is necessary to protect the transceiver from thermal damage and can therefore not be turned
  • Kenwood TM-281A | User Manual - Page 68
    MICROPHONE CONTROL You can change numerous transceiver settings by operating the Mic DTMF keys. The following table shows what function is switched ON and OFF or which setting is changed by pressing the DTMF keys in the appropriate mode of operation. Key RX Mode TX Mode 1 Storing Memory Name
  • Kenwood TM-281A | User Manual - Page 69
    1 DTMF tones are not transmitted in TX Mode if the DTMF Lock function is ON. 2 When transmitting a stored DTMF number, press Mic [PTT]+Mic [PF/D], release Mic [PF/D], then press a Memory Channel number from 0 to 9. To transmit the "D" tone, press Mic [PF/D] again. 3 On the display, is represented by
  • Kenwood TM-281A | User Manual - Page 70
    OPTIONAL ACCESSORIES SP-50B Communications Speaker MCP-1A Memory Control Program (Free Software) The MCP-1A can be downloaded at: http://www.kenwood.com/i/products/ info/amateur/software_download.html PG-3B DC Line Noise Filter KMC-30 Microphone MC-59 DTMF Microphone MC-60A Stand Microphone
  • Kenwood TM-281A | User Manual - Page 71
    TROUBLESHOOTING MAINTENANCE GENERAL INFORMATION This product has been factory aligned and tested to specification before shipment. Under normal circumstances, the transceiver will operate in accordance with these instructions. All adjustable trimmers, coils, and resistors in the transceiver were
  • Kenwood TM-281A | User Manual - Page 72
    service, please include a photocopy of the bill of sale, or other proof-of-purchase showing the date of sale , resetting the microprocessor may solve the problem. The following 2 reset modes are available operating frequencies are as follows. • TM-281A: 144.000 MHz • TM-481A: 440.000 MHz The Memory
  • Kenwood TM-281A | User Manual - Page 73
    Full Reset Method 2: 1 Press [F], [MENU] and turn the Tuning control to select Menu No. 99 (RESET). 2 Press [MENU] and turn the Tuning control to select "FULL". 3 Press [MENU]. • "SURE ?" appears. • Press any key other than [MENU] to cancel. 4 Press [MENU] to reset the transceiver. • "WAIT" appears
  • Kenwood TM-281A | User Manual - Page 74
    are usually not caused by circuit failure. Please review these tables and the appropriate section(s) of this instruction manual before assuming your transceiver is defective. Problem Problem Cause Corrective Action Page Ref. The transceiver will not power up after connecting a 13.8 V DC power
  • Kenwood TM-281A | User Manual - Page 75
    Channels cannot be selected by turning the Tuning control or by pressing Mic [UP]/[DWN]. You cannot transmit even though you press Mic [PTT]. Problem Cause No data has been stored in any Memory Channels. Corrective Action Store data in some Memory Channels. 1 The microphone plug was not inserted
  • Kenwood TM-281A | User Manual - Page 76
    Specifications are subject to change without notice due to advancements in technology. TX frequency range RX frequency range Mode Antenna impedance Usable temperature range Power supply Grounding method General TM-281A (M3 market models) TM-481A (M market models) TM-281A (M3 market models) TM-481A
  • Kenwood TM-281A | User Manual - Page 77
    dB or less Wide: ±5 kHz Narrow: ±2.5 kHz 3% or less 600 Ω Double superheterodyne 49.95 MHz/ 450 kHz Wide (TM-281A): 0.18 μV or less Wide (TM-481A): 0.20 μV or less Narrow (TM-281A): 0.22 μV or less Narrow (TM-481A): 0.25 μV or less Wide: 12 kHz or more Narrow: 10 kHz or more Wide: 30 kHz or less
  • Kenwood TM-281A | User Manual - Page 78
    a Stored Number 50 INDEX Lock 51 Manual Dialing 48 Monitor 48 Pause Duration 51 Specifications 69 Squelch Adjusting 14 Hang Time 53 S-meter 52 Time-out Timer (TOT 60 Tone 1750 Hz Tone 25 Activating 24 Freq. ID Scan 27 Selecting 24 Transmitting 15 Output Power 15 Troubleshooting
  • Kenwood TM-281A | User Manual - Page 79
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© B62-2348-20 (M,M3)
09 08 07 06 05 04 03 02
144 MHz FM TRANSCEIVER
430 MHz FM TRANSCEIVER
INSTRUCTION MANUAL
144 MHz FM
调频对讲机
430 MHz FM
调频对讲机
使用说明书
TM-281A/ TM-481A