Mini Walkie-Talkie (7 Channels, 27–480 MHz) from an Inexpensive Chinese Module

If you’ve ever wanted to build your own compact walkie-talkie without spending much money, this guide is exactly what you need. Thanks to the availability of affordable, ready-made walkie-talkie modules, it’s now possible to assemble a small but fully functional communication device with minimal effort. Such a unit can switch between seven preset frequencies ranging from 27 to 480 MHz and conveniently displays the active channel on an LCD screen. With just a few common components and some basic assembly, you can quickly put together a reliable handheld radio perfect for experiments, hobby projects, or simple short-distance communication.

Parts and Components:

• 7-channel walkie-talkie module with antenna, buy on AliExpress – https://s.click.aliexpress.com/e/_c3w4866l;
• Speaker – 0.5 W, 8 Ω – https://s.click.aliexpress.com/e/_c4FmjZx7;
• Battery protection and charging board TP4056 – https://s.click.aliexpress.com/e/_c3Y3bKAN;
• Power switch;
• Tactile push button;
• 3.7 V Li-ion battery.

Walkie-Talkie Module Specifications:

• Communication range: up to 300 meters (in open areas);
• Supply voltage: 3.3–6 V;
• Current consumption in receive mode: 25 mA;
• Current consumption in transmit mode: 150 mA;
• Module dimensions: 35 × 50 mm.

Operating frequencies (channels):

• CH1 – 467.6625 MHz
• CH2 – 462.6625 MHz
• CH3 – 446.05625 MHz
• CH4 – 409.8000 MHz
• CH5 – 168.2625 MHz
• CH6 – 40.650 MHz
• CH7 – 27.125 MHz

How to Build the Walkie-Talkie (Step-by-Step)

I began by measuring all components and designing a simple enclosure that would hold them. After that, I printed the case on a 3D printer. The design is fairly minimalistic, as my goal was to test the performance of the radio as quickly as possible.

Next, I mounted the walkie-talkie module inside the case and connected the speaker to the appropriate socket on the board.

Then I installed the power switch and the PTT (push-to-talk) button. The module already has a built-in transmit button on the front panel, but I added an extra one on the case for better ergonomics—similar to what most walkie-talkies use.

I attached a TP4056 charging board and soldered the negative wire directly to the walkie-talkie board, while routing the positive lead through the power switch.

After that, I soldered the antenna to the transceiver module. The antenna included with the module is most likely tuned for frequencies around 400 MHz, so while it works for the higher channels, it isn’t optimal for the lower bands. For low-frequency channels such as 40 and 27 MHz, you will need to use telescopic antennas or ready-made wire (or spring-type) antennas designed specifically for those frequencies.

Finally, I connected the power supply. For this build, I chose a small flat 3.7 V Li-ion battery rated at 600 mAh and soldered it to the protection/charging board.

That’s it—your homemade walkie-talkie is ready. I assembled several units at once. Simply turn them on, select the desired channel using the right button, and press the PTT button to talk. The middle button adjusts the volume up or down.