TM-231A / E

Kenwood
TM-231A / E

Specifications

Prices

2-meters FM amateur mobile Transceiver with three output power levels at 5 / 10 / 50 Watts. Extended receive range from 138 to 174 MHz, 20 memory channels plus 1 call-channel, scanning, built-in CTCSS encode, time-out timer and auto-power off, auto repeater offset and reverse mode, front panel display dimmer. Ideated in Japan, year of introduction 1989.

Reference market : amateur-radio

TM-231A / E specifications

General

Frequency coverage
Receive	144.0000 ~ 148.0000 MHz [1] 144.0000 ~ 146.0000 MHz [2] 138.0000 ~ 174.0000 MHz [3]
Transmit	144.0000 ~ 148.0000 MHz [1] 144.0000 ~ 146.0000 MHz [2]
Mode
FM
Tuning step
5 / 10 / 12.5 / 15 / 20 / 25 kHz 1 MHz

Receiver

Sensitivity
FM	<0.16 uV (12dB SINAD)
Selectivity
FM	>12 kHz (-6dB) <24 kHz (-60dB)
Frequency stability
±10ppm max
IF (Intermediate Frequency)
1°	10.700 MHz
2°	455 kHz
Squelch sensitivity
<0.1 uV

Transmitter

Output power
FM	5 / 10 / 50 [4] W
Spurious emission
<-60 dBc
Maximum deviation (FM)
±5 kHz
Audio distortion
<3% (at 60% modulation)
Microphone
500~600Ω

Features

Memory
20 regular and special memories 1 priority alert channel (CH 1) 1 scan ranges (CH 15/16) 2 spit channels (CH 17~20)
Display
sub-kHz frequency resolution 14-segments signal meter bar
Selective calling
DTMF (USA version) 1750 Hz tone (European version) CTCSS
Antenna
SO239 50Ω
Power supply
13.8 VDC (11.7~15.8 VDC)
Power consumption
<0.6A RX (no input signal) <11A TX (max output power)
Audio power
2W on 8Ω
Audio output
Jack 3.5 mm (8Ω external speaker)
Connections
8-pin Jack (Microphone)

Mechanical and environmental data

Operating temperature
from -20°C to +60°C
Dimensions
140 (W) x 40 (H) x 160 (D) mm, projections not included 141 (W) x 42 (H) x 171 (D) mm, projections included
Weight
1.2 kg

TM-231A version.
TM-231E version.
Some version include expanded receive coverage.
Recommended duty cycle 1 minute transmit, 3 minutes reception.

Aeronautical Radio List UK - N. IRELAND 2024

Download Now the eBook, with All the Frequencies 108-137 MHz

Updated | Complete | UK - NORTHERN IRELAND
378 pages | 300+ Airports and Airfields
Voice com. | ACC | FIC | VOLMET | ACARS | VDL | ILS | VOR | DME

TM-231A / E priority alert function :

The priority alert function allows you to monitor memory channel 1 for activity even when you are tuned to a different channel number. When the Priority Alert function has been activated the microprocessor will switch the transceiver to the frequency stored in memory channel 1 once every 5 seconds. The transceiver will determine if a signal is present. If no signal is present the transceiver will return to the original frequency. If a signal is present beep will sound from the speaker to signal the channel is busy. This whole process takes just a fraction of a second, so you will not see the display frequency change. The only thing you will notice is a momentary loss of the signal on the currently displayed frequency. To activate the priority alert function:

Ensure the frequency you wish to monitor has been entered into memory channel 1.
Adjust the SQL control to the threshold point.
Press the F key momentarily, and then press the SHIFT/AL key. The AL indicator will turn on in the display to remind you that this function has been activated.
If a signal is present a beep will be heard from the speaker.

Note: During the period memory channel 1 is being scanned you will not hear voice communications, only the beep will be heard if a signal is present. To turn this function off press the F key momentarily, and then press the SHIFT/AL key. The AL indicator should turn off.

TM-231A / E price

We have collected for your convenience the Kenwood TM231 sale price (Euro) and its trend over time. Useful to guarantee a cheaper purchase of this radio and to put it for sale in the second-hand market. Of course offers, accessories, warranty terms and conditions can lead to different figures.

Price	Date	Condition
EUR 79.90 (85USD)	2022-jan	Second Hand Working. Comes with microphone and mounting bracket

TM-231A / E review

Your opinion on merits, defects, experiences, with this radio set is welcome. Write your review, after a technical evaluation by our staff if found suitable will be published on this page. We thank you for your precious contribution.