TM-231A / E
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.
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 (US Dollar) 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 |
USD 85.00 | 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.