DUAL TONE MULTI-FREQUENCY (DTMF) FUNCTIONS

This transceiver provides you with 10 dedicated DTMF Memory Channels. You can store a DTMF number (16 digits max.) in each of these channels to recall later for 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 a repeater by sending DTMF tones. For further information, consult your local repeater reference.

MANUAL DIALING

The keys on the Mic keypad function as DTMF keys; the

12keys found on a push-button telephone plus 4 additional keys (A, B, C, D).

To perform Manual Dialing, follow the steps below.

1Press and hold Mic [PTT] to transmit.

2While transmitting, press the keys in sequence on the keypad, to send the DTMF tones.

10

¥ The corresponding DTMF tones are transmitted.

Freq. (Hz)

1209

1336

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 activated {page 51}, you do not need to continuously press Mic [PTT] to remain in transmission mode. However, transmission mode is retained for only 2 seconds after pressing a key, so if the next key is not pressed within this time limit, the transceiver stops transmitting.

DTMF MONITOR

When pressing the Mic DTMF keys, you will not hear DTMF tones emitted from the speaker. However, you can monitor the DTMF tones if desired.

1Press [F], [MENU] and turn the Tuning control to select Menu No. 33 (DT.M).

2Press [MENU] and turn the Tuning control to select ÒONÓ or ÒOFFÓ (default).

3Press [MENU] to store the setting or any other key to cancel.

4Press any key other than [MENU] to exit Menu Mode.

50

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Kenwood TM-271A, TM-271E instruction manual Dual Tone MULTI-FREQUENCY Dtmf Functions, Manual Dialing, Dtmf Monitor

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.