Maas PT-375 PMR446 Walkie Talkie
Safety Instructions
- Read the following warnings to prevent fire, personal injury, or damage to the CB radio or antenna.
- Do not try to adjust the CB radio while driving; it is dangerous.
- Do not position the CB radio on an excessively dusty, wet, or unstable surface.
- Do not connect the antenna during transmission; risk of burns or electric shock.
- Keep your distance from devices that create interference (such as TV, generator, etc.)
- Do not bring metal objects close to the internal electrical part of the CB radio; danger of electric shock.
- Do not expose the CB radio to sunlight for a long time.
- Do not put anything on the CB radio; it will prevent it from cooling down.
- Check if you have a sufficiently charged car battery to avoid a rapid discharge.
- When replacing the fuse, you must use a fuse of the same type as the original one.
- If an abnormal smell or smoke comes out of the CB radio, turn off the power immediately.
- Do not transmit for a long time; the CB radio may heat up and malfunction.
Features
- PMR446 radio
- Compact, elegant design
- 99 channels (56 pre-programmed)
- Transmitting power 500 mW
- Channel spacing 12.5 kHz
- Voice announcement
- VOX function, sensitivity adjustable in 10 steps
- Splash-proof according to IPX2
- Search function
- Key tones
- Roger Beep
- Battery saving mode
- Monitor function
- Squelch is adjustable in 10 steps
- Display with adjustable brightness
- Battery warning via voice output
- 2-pin socket for audio accessories
- Li-ion battery with 2300 mAh
- PC-programmable
- Radio
- Belt clip, rotatable
- Rechargeable Li-ion battery 3.7 V/2300 mAh
- Stand charger (for battery on the radio or battery separately)
- Power adapter with micro USB cable
Front and side views
- Antenna (not removable)
- Press the key briefly to enter the menu. Press and hold the key to start the search. The button can be individually programmed using the PRG-10 programming kit.
- Switch/Volume knob: Turn clockwise to switch on the unit, Maas PT-375 PMR446 Walkie Talkie, and then increase the volume. Turn it counterclockwise to reduce the volume or turn the radio off.
- LED Red=Transmit; Orange=Transmit with CTCSS/DCS; Green: Receive
- Speaker openings
- Microphone
- Display
- UP/DOWN buttons: Press briefly to switch 1 channel up or down. Press and hold to skip 10 channels at once. During the scan, use the buttons to change direction.
- Monitor button: Press briefly to switch the monitor function on or off. Press and hold to display the battery charge status. The button can be individually programmed using the PRG-10 programming kit.
- PTT: Press and hold the button to transmit. When the button is released again, the radio goes on reception.
- Li-Ion battery 3.7 V/2300 mAh
- Loudspeaker/microphone socket: Connection possibility for external accessories (e.g., headsets), compatible with Maas headsets, Speakermikes, etc., with “K” plug or original Kenwood accessories. If you are not using an accessory, please cover the socket with the cover.
- Micro USB socket: The battery of the radio can also be charged via USB.
Switching on/off and adjusting the volume
- Turn the power/volume dial clockwise to switch on the radio. Turn the control clockwise or counterclockwise to adjust the volume as needed.
- Turn the control counter-clockwise until you hear- mechanical “click” to switch off the radio.
Send
To be able to communicate with each other, all radios in your Maas PT-375 PMR446 Walkie Talkie group must be set to the same channel. Press the monitor key briefly to activate the monitor function. This allows you to check whether the channel is occupied.
Then press the PTT button to transmit and release the PTT button to receive. During radio communication, only one partner can speak at a time. Therefore, do not transmit yourself when you hear a partner. Only transmit as little as possible so that the channel remains free.
A lot of power is consumed when sending. Therefore, keep your transmission time as short as possible so that the battery lasts longer. If you cannot reach a partner that you normally can receive without problems, they may be using CTCSS tones or DCS codes.
Monitor
The monitor function allows you to temporarily deactivate the squelch function to receive signals that are too weak to be heard when the squelch function is activated. Briefly press the monitor key to activate or deactivate the function.
Search function
Press the Menu button for about 3 seconds to start the scan. The radio then scans all channels, starting from the current channel. The display of the radio shows an arrow running from left to right (upward search). Use the UP/DOWN buttons to reverse the search direction (downward search).
As soon as a signal is found, the search stops on the specified channel. With the optionally available PRG-10 programming software, you can select three different search modes. The default mode is “Carrier”. It searches for carrier signals and stops as soon as one is found.
If the signal disappears, the search continues automatically after about seven seconds. By pressing the PTT button, you end the search, and the radio transmits on the channel used. To start the search again, press the menu key again for 3 seconds.
VOX
Thanks to the VOX function, hands-free talking is possible with the PT-375. Simply speak into the microphone, and the radio automatically switches to transmit without having to press the PTT button.
The sensitivity of the VOX can be adjusted in ten steps (OFF, 1… 9) using the programming software or the menu of the radio. “OFF” means that the VOX function is switched off; “1” is the lowest sensitivity level of V, OX, and “9” is the highest.
To set the desired sensitivity of VOX via the radio’s menu, proceed as follows: Briefly press the menu key. Now press the monitor button twice. The display shows the sensitivity with the indication. With the UP/DOWN keys, you can now set the desired sensitivity from 0 to 9. Confirm the setting by pressing the PTT button or waiting about three seconds.
Voice announcements
operation or selection you make on the radio. To activate or deactivate the voice prompt, proceed as follows: Briefly press the menu key. Now press the monitor button three times. The display shows if voice announcement is activated and then or if voice announcement is deactivated.
The UP/DOWN keys can be used to activate and deactivate the function. Confirm the setting by pressing the PTT button or waiting about three seconds. The voice announcement function can also be activated or deactivated via the optional programming software.
Squelch
The squelch function suppresses annoying noise on free channels. The PT-375 has ten different squelch levels: “0” indicates that the squelch is permanently open; the steps “1” to “9” are different levels of squelch.
Do not set the squelch level too high; otherwise, you may not be able to receive weaker signals. On the other hand, setting the level too low may open the squelch even though there is no signal.
Procedure: Briefly press the menu key. Press the monitor button once. The display shows. Set the squelch level with the UP/DOWN keys. Confirm the setting by pressing the PTT button or waiting for about three seconds.
Key tones
- Proceed as follows to activate or deactivate the key tones: Briefly press the menu key.
- Activate or deactivate the key tones with the UP/DOWN keys. = ON; = OFF.
- Confirm the setting by pressing the PTT button or waiting about three seconds.
Maintenance
- Do not open the unit. Improper handling can damage the appliance.
- High temperatures can damage electronic devices.
- Do not place the radio in a dusty or dirty environment.
- Protect the radio from moisture and rain.
- If the radio emits a strange smell or smoke, switch it off and remove the battery or disconnect the power supply.
- Do not transmit without an antenna.
Charge battery
Place the radio in the larger holder of the table charger, or the battery alone in the smaller holder. Plug the mains adapter into the mains socket and insert the charging plug of the mains adapter into the DC socket of the table charger.
It takes five to six hours to fully charge the battery. The use of chargers other than the one supplied may cause damage to your radio or the battery, including explosion, fire, and personal injury. You can also charge the battery by connecting the supplied USB cable to the micro USB port on the radio.
If you switch on the radio and then connect the micro-USB cable, the display will show the battery charge status while the battery is charging, just like a smartphone. The battery saving function can reduce power consumption by up to 50 per cent.
Energy-saving mode
- Enter the menu of the radio and proceed as follows. Briefly press the menu button. Press the monitor key four times.
Adjust the brightness of the LED display.
- Briefly press the menu key. The display shows the current brightness level by the symbol.
- Use the UP/DOWN keys to set the desired brightness (from “1” to “4”).
- Confirm the setting with the PTT button or by waiting about three seconds.
Firmware version check
- To view the firmware version of the radio, proceed as follows: Briefly press the menu button. Press the monitor key six times.
Troubleshooting
| Problem | Cause | Remedy |
| The radio cannot be switched on | The battery may be discharged or not correctly installed. | Charge the battery or check the seating |
| The radio switches off shortly after it has been switched on | Battery discharged | Charge battery |
| The battery will not charge | The battery is not connected correctly or is not installed correctly | Check the contact and the correct fit of the battery. |
| The radio is not receiving signals. | Wrong CTCSS tone or DCS code | Change location Increase volume Check that the CTCSS tone or DCS code matches that of the communication partner. |
| Radio permanently noises | Monitor function is activated | Deactivate monitor function |
| VOX starts the transmission unintentionally | VOX sensitivity is too high | Reduce VOX sensitivity |
Technical Data
General
- Frequency446.00625-446.19375 MHz (PMR446)
- Channels99 (56 preprogrammed) Operating temperature-20°C.. .+55° C
- Operating voltage3. 7 V
Operating mode Simplex Dimensions126 mm × 57 mm × 27 mm (without antenna) - Weight142 g (with battery)
- Antenna impedance50 Ω
- Duty Cycle 5/5/90%
Transmitter
- Frequency stability±2 .5 ppm Output
- power ≤500 mW (ERP)
- Max. Frequency deviation≤2.5 kHz
- Audio distortion ≤3% adjacent
- channel power <60 dB
Receiver
- Sensitivity <0.2 µV@20 dB
- SINAD Audio distortion ≤3% Transmission
- range 300 Hz …3 kHz
FAQs
Q: What is the operating range of the MaaS PT-375 PMR446 walkie talkie?
Ans: In open spaces, the PT-375 normally flies up to 3 to 5 kilometres (1.9 to 3.1 miles). Terrain, barriers, and environmental factors can all affect range.
Q: Does the PT-375 require a license to operate?
Ans: No, most European nations do not require a licence for the PT-375’s usage of the PMR446 frequency band, which makes it simple and lawful for both personal and commercial use without the need for further documentation.
Q: How many channels are available on the PT-375?
Ans: The walkie talkie supports 8 PMR446 channels with additional privacy codes for clearer communication and reduced interference.
Q: How is the PT-375 powered?
Ans: The gadget may be used and recharged while on the go thanks to its use of normal AA batteries or rechargeable NiMH batteries.
Q: Does the PT-375 have any hands-free features?
Ans: Yes, it supports voice-activated transmission, or VOX. When enabled, this feature enables hands-free communication, which is helpful in circumstances where hands are engaged or busy.
Q: Can the PT-375 be used in noisy environments?
Ans: Clearer discussions in busy environments are ensured by the walkie talkie’s squelch and privacy code features, which reduce background noise and interference.
Q: Is the PT-375 waterproof or ruggedized?
Ans: Although it is not completely waterproof, the PT-375 features a sturdy build and some splash and dust protection. Avoiding submersion or intense rain is the recommended course of action.
Q: How do I pair two PT-375 units for communication?
Ans: Just set the channel and privacy code (if applicable) to the same for each units. Within range, they will then be able to communicate quickly.