Kenwood TM-271A, TM-271E instruction manual Selective Call, Ctcss and DCS, Rejected

Page 53

SELECTIVE CALL

CTCSS AND DCS

You may sometimes want to hear calls from only specific persons or groups. In this case, use Selective Call. This transceiver is equipped with CTCSS (Continuous Tone Coded Squelch System) and DCS (Digital Coded Squelch). These Selective Calls allow you to ignore (not hear) unwanted calls from other persons who are using the same frequency. The transceiver unmutes only when it receives a signal having the same CTCSS tone or DCS code.

Note: CTCSS and DCS do not cause your conversation to be private or scrambled. It only relieves you from listening to unwanted conversations.

CTCSS

A CTCSS tone is a sub-audible tone and is selectable from among the 42 tone frequencies listed in the table on page 47. The list includes 37 EIA standard tones and 5 non-standard tones.

To activate CTCSS, press [F], [CALL].

Received

TM-271

9

Rejected

CTCSS freq.: 82.5 Hz

Rejected

TM-271

CTCSS freq.: 82.5 Hz

TM-271

CTCSS freq.: 100 Hz

TM-271

¥As you press [F], [CALL], the selection cycles as follows:

ÒOFFÓ ➞ ÒTONEÓ ➞ ÒCTCSSÓ ➞ ÒDCSÓ ➞ ÒOFFÓ.

¥ÒCTÓ appears on the upper part of display, indicating that the CTCSS function is activated.

When CTCSS is ON, you will hear calls only when the selected CTCSS tone is received. To answer the call, press and hold Mic [PTT], then speak into the microphone.

Note:

◆ You cannot use the CTCSS and Tone/ DCS functions

simultaneously. Switching the CTCSS function ON after having

activated the Tone/ DCS functions deactivates the Tone/ DCS

functions.

◆ If you select a high CTCSS frequency, receiving audio or noise

that contains the same 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 tone by pressing [CALL]

{page 25}, the transceiver does not transmit the CTCSS tone.

CTCSS OFF

46

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Contents TM-271A Page Thank YOU FeaturesModels Covered by this Manual Market CodesOne or more of the following statements may be applicable When condensation occurs inside the transceiverContents Iii MHz ScanMicrophone Control Supplied Accessories Preparation Mobile InstallationDC Power Cable Connection Fixed Station Operation Fuse Location Fuse Current Rating Transceiver 15 a Supplied Accessory 20 a DC Power CableAntenna Connection Microphone hanger Microphone hanger screw 3 mm x 10 mm Accessory ConnectionsPin No Pin Name Function Connecting to a TNC E Market Models onlyYour First QSO Press Power briefly to switch the transceiver power onFront Panel Getting AcquaintedMR key DisplayREV key KeyPage Microphone Rear PanelVFO/B key CALL/A keyMR/C key PF/D keyAdjusting the Volume Switching the Power ON/OFFAdjusting the Squelch Operating BasicsTransmitting Selecting a Frequency VFO ModeWhen you finish speaking, release Mic PTT ¥ You must be in VFO mode to make a direct frequency entry Enter Mic VFO ExampleEnter What is a MENU? Menu SetupMenu Access Turn the Tuning control to select your desired MenuMenu Function List Menu Function Selections Default DisplayPower-on message Characters Beep Time-out Timer 10 minTuning control lock Call key Varies see 25,35 ReferenceData TX speed 1200/ 9600 bps Reset selectionDisplay brightness Maximum level Automatic display brightnessOffset Programming Flow Operating Through RepeatersProgramming AN Offset Tone Frequencies Hz Available Tone FrequenciesTo activate Tone, press F, Call Market version only Call Channel default settingsAutomatic Repeater Offset Automatic Simplex Check ASC Reverse FunctionPressing PTT causes the Ò Ó icon to quit blinking Tone Frequency ID ScanNumber of Memory Channels Memory ChannelsSimplex & Repeater or ODD-SPLIT Memory CHANNEL? Odd-split channels allowYes DCS code Data listed below can be stored in each Memory ChannelParameter Simplex Odd-Split Press MR 1s Recalling a Memory ChannelPress MR to erase the channel data Clearing a Memory ChannelPress MR Naming a Memory ChannelPress Menu Mic UP /DWN Memory Channel TransferPress F, VFO to copy the Memory Channel data to the VFO Channel 0 ~ Press Call to recall the Call Channel Call ChannelWX1 WX2 WX3 WX4 WX5 WX6 WX7 Weather Alert K Market Models onlyChannel Display Page Scans the Call Channel ScanScan Type Purpose Storing a Program Scan Frequency Range Turn the Tuning control or press Mic UP/DWNNormal Scan Press any key other than F or Power to stop MHz Scan Press any key other than F or Power to stop Program ScanPerforming Program Scan Press MR to store the end frequency in the Memory ChannelMemory Scan Press any key other than F or Power to stop Group ScanPress Menu 1s ChannelsCall Scan Press any key other than F or Power to stop Call ScanPriority Scan Press Call 1s to start the Call ScanIcon disappears Memory Channel LockoutCarrier-Operated Mode Time-Operated Mode defaultSeek Mode Scan Resume MethodCtcss and DCS Selective CallCtcss RejectedAvailable Ctcss Tone Frequencies Ctcss DCSDCS Codes DCS Code ID ScanManual Dialing Dual Tone MULTI-FREQUENCY Dtmf FunctionsDtmf Monitor Freq. Hz 1209 1336 1477 1633Dtmf TX Hold Turn the Tuning control to select a Dtmf codeAutomatic Dialer Press MenuRelease Mic PTT Press REV10 4 Press any key other than REV or Menu to exit Dtmf Lock Auxiliary Functions APO Auto Power OFFBeat Shift Meter SquelchÒoffó Beep FunctionFrequency Step Size Busy Channel LockoutDisplay Backlight Default step size for each model is as followsMarket Code KHzLock Function Tune EnableData Communication Speed Press F 1sProgrammable Functions Microphone PF Keys Keypad Models onlyNarrow Band FM Operation POWER-ON MessagePress MR to move to the next digit Turn the Tuning control to select a characterProgrammable VFO TIME-OUT Timer Microphone Control Key RX Mode TX ModeStoring Power-on Space MIC LockKey KMC-30 KMC-32 MC-60A PS-33/53 SP-50BKPG-46 MCP-1A can be downloaded atMaintenance TroubleshootingFull Reset Method Resetting the TransceiverWith the transceiver power OFF, press F+ Power Press F again to reset the transceiverVFO Reset Method VFO ResetWith the transceiver power OFF, press VFO+ Power Press VFO again to reset the transceiverTroubleshooting PTT Problem Probable Cause Corrective ActionGeneral SpecificationsNarrow 0.22 ∝V or less Transmitter

TM-271A, TM-271E specifications

The Kenwood TM-271A and TM-271E are robust dual-band transceivers designed for amateur radio enthusiasts looking for reliability, functionality, and ease of use. Both models operate in the VHF and UHF bands, specifically covering 144-148 MHz and 430-450 MHz, respectively. This versatility allows users to communicate across varied frequencies, making them suitable for a wide range of applications, from casual conversations to emergency communications.

One of the standout features of the TM-271A and TM-271E is their compact size, making them an ideal choice for mobile operations. Despite their small footprint, these radios pack a punch with a maximum transmit power of 50 watts in the VHF band and 35 watts in the UHF band. This power output ensures clear and effective communication over long distances, essential for outdoor activities and emergency situations.

The user-friendly interface of the TM-271 models includes a large, backlit LCD display, which provides clear visibility in various lighting conditions. The controls are intuitively arranged, allowing users to navigate functions with ease. Moreover, both models come equipped with an alphanumeric memory, allowing for the storage of up to 200 memories for easy access to frequently used frequencies.

Advanced features such as a built-in CTCSS (Continuous Tone-Coded Squelch System) and DCS (Digital Coded Squelch) enhance communication clarity by minimizing unwanted noise and ensuring that only desired signals are received. The TM-271A and TM-271E also support a wide range of modulation modes, including FM, allowing versatility in communication styles.

In terms of durability and build quality, the Kenwood TM-271 series excels with a rugged design that withstands the rigors of mobile use. The units are also equipped with a front-facing speaker that delivers excellent audio quality, ensuring clear communications even in noisy environments.

Another notable feature is the wideband reception capability, allowing users to listen to signals outside of the amateur bands, making these transceivers more versatile for everyday monitoring of public safety channels and other broadcasts. Furthermore, the inclusion of a built-in diagnostic function aids users in troubleshooting, ensuring that the radio remains in optimal working condition.

In conclusion, the Kenwood TM-271A and TM-271E are outstanding choices for amateur radio operators seeking a powerful, feature-rich, and user-friendly dual-band transceiver. Their combination of advanced technology, compact design, and rugged reliability makes them a popular choice among both novice and experienced operators in the radio community.
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