Kenwood TM-271A, TM-271E instruction manual Transmitter, Narrow 0.22 ∝V or less

Page 79

 

 

Transmitter

 

 

 

 

Power output

High

 

60 W

 

 

 

Low

 

Approx. 25 W

 

 

 

 

 

 

Modulation

 

Reactance

 

 

 

 

Spurious emissions

 

Ð60 dB or less

 

 

 

 

Maximum frequency deviation

 

Wide: ±5 kHz

 

Narrow: ±2.5 kHz

 

 

 

 

 

 

 

Audio distortion (at 60% modulation)

 

3% or less

 

 

 

 

Microphone impedance

 

600 Ω

 

 

 

 

 

 

 

 

 

 

Receiver

 

 

 

Circuitry

 

Double conversion superheterodyne

 

 

 

Intermediate frequency (1st/ 2nd)

 

49.95 MHz/ 450 kHz

 

 

 

Sensitivity (12 dB SINAD)

 

Wide: 0.18 ∝V or less

 

 

 

Narrow: 0.22 ∝V or less

 

 

 

Selectivity (Ð6 dB)

 

Wide: 12 kHz or more

 

 

 

Narrow: 10 kHz or more

 

 

 

Selectivity (Ð60 dB)

 

Wide: 30 kHz or less

 

 

 

Narrow: 24 kHz or less

 

 

 

Squelch sensitivity

 

0.1 ∝V or less

 

 

 

Audio output (8 ohms, 5% distortion)

 

2 W or higher

 

 

 

Audio output impedance

 

8 Ω

 

 

 

 

72

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Contents TM-271A Page Market Codes FeaturesThank YOU Models Covered by this ManualOne 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 Antenna Connection Transceiver 15 a Supplied Accessory 20 a DC Power CableFuse Location Fuse Current Rating 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 AcquaintedKey DisplayMR key REV keyPage Microphone Rear PanelPF/D key CALL/A keyVFO/B key MR/C keyOperating Basics Switching the Power ON/OFFAdjusting the Volume Adjusting the SquelchWhen you finish speaking, release Mic PTT Selecting a Frequency VFO ModeTransmitting ¥ You must be in VFO mode to make a direct frequency entry Enter ExampleEnter Mic VFO Turn the Tuning control to select your desired Menu Menu SetupWhat is a MENU? Menu AccessMenu Function List Menu Function Selections Default DisplayCall key Varies see 25,35 Reference Time-out Timer 10 minPower-on message Characters Beep Tuning control lockAutomatic display brightness Reset selectionData TX speed 1200/ 9600 bps Display brightness Maximum levelOffset Programming Flow Operating Through RepeatersProgramming AN Offset To activate Tone, press F, Call Available Tone FrequenciesTone Frequencies Hz Automatic Repeater Offset Call Channel default settingsMarket version only Automatic Simplex Check ASC Reverse FunctionPressing PTT causes the Ò Ó icon to quit blinking Tone Frequency ID ScanOdd-split channels allow Memory ChannelsNumber of Memory Channels Simplex & Repeater or ODD-SPLIT Memory CHANNEL?Parameter Simplex Odd-Split Data listed below can be stored in each Memory ChannelYes DCS code Press MR 1s Recalling a Memory ChannelPress MR to erase the channel data Clearing a Memory ChannelPress Menu Naming a Memory ChannelPress MR Press F, VFO to copy the Memory Channel data to the VFO Memory Channel TransferMic UP /DWN 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 Scan Type Purpose ScanScans the Call Channel Normal Scan Turn the Tuning control or press Mic UP/DWNStoring a Program Scan Frequency Range Press MR to store the end frequency in the Memory Channel Press any key other than F or Power to stop Program ScanPress any key other than F or Power to stop MHz Scan Performing Program ScanChannels Press any key other than F or Power to stop Group ScanMemory Scan Press Menu 1sPress Call 1s to start the Call Scan Press any key other than F or Power to stop Call ScanCall Scan Priority ScanIcon disappears Memory Channel LockoutScan Resume Method Time-Operated Mode defaultCarrier-Operated Mode Seek ModeRejected Selective CallCtcss and DCS CtcssAvailable Ctcss Tone Frequencies Ctcss DCSDCS Codes DCS Code ID ScanFreq. Hz 1209 1336 1477 1633 Dual Tone MULTI-FREQUENCY Dtmf FunctionsManual Dialing Dtmf MonitorPress Menu Turn the Tuning control to select a Dtmf codeDtmf TX Hold Automatic Dialer10 4 Press any key other than REV or Menu to exit Press REVRelease Mic PTT Dtmf Lock Meter Squelch APO Auto Power OFFAuxiliary Functions Beat ShiftÒoffó Beep FunctionFrequency Step Size Busy Channel LockoutKHz Default step size for each model is as followsDisplay Backlight Market CodePress F 1s Tune EnableLock Function Data Communication SpeedProgrammable Functions Microphone PF Keys Keypad Models onlyNarrow Band FM Operation POWER-ON MessageProgrammable VFO Turn the Tuning control to select a characterPress MR to move to the next digit TIME-OUT Timer Storing Power-on Key RX Mode TX ModeMicrophone Control Key MIC LockSpace MCP-1A can be downloaded at PS-33/53 SP-50BKMC-30 KMC-32 MC-60A KPG-46Maintenance TroubleshootingPress F again to reset the transceiver Resetting the TransceiverFull Reset Method With the transceiver power OFF, press F+ PowerPress VFO again to reset the transceiver VFO ResetVFO Reset Method With the transceiver power OFF, press VFO+ PowerTroubleshooting 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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