MaaS PT-375 PMR446 Walkie Talkie Instruction Manual

Maas PT-375 PMR446 Walkie Talkie

Safety Instructions

1. Read the following warnings to prevent fire, personal injury, or damage to the CB radio or antenna.
2. Do not try to adjust the CB radio while driving; it is dangerous.
3. Do not position the CB radio on an excessively dusty, wet, or unstable surface.
4. Do not connect the antenna during transmission; risk of burns or electric shock.
5. Keep your distance from devices that create interference (such as TV, generator, etc.)
6. Do not bring metal objects close to the internal electrical part of the CB radio; danger of electric shock.
7. Do not expose the CB radio to sunlight for a long time.
8. Do not put anything on the CB radio; it will prevent it from cooling down.
   1. Check if you have a sufficiently charged car battery to avoid a rapid discharge.
9. When replacing the fuse, you must use a fuse of the same type as the original one.
10. If an abnormal smell or smoke comes out of the CB radio, turn off the power immediately.
11. 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

1. Antenna (not removable)
2. 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.
3. 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.
4. LED Red=Transmit; Orange=Transmit with CTCSS/DCS; Green: Receive
5.  Speaker openings
6. Microphone
7. Display
8. 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.
9. 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.
10. PTT: Press and hold the button to transmit. When the button is released again, the radio goes on reception.
11. Li-Ion battery 3.7 V/2300 mAh
12. 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.
13. 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

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