HamShield Mini

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  • Regular price $ 50.00

Our smallest tri-band radio transceiver yet!

HamShield Mini is half the size of HamShield, making it great for high altitude balloon projects, cubesats, drone based repeaters, embedded designs and more. Just like HamShield, HamShield Mini works across three amateur radio bands: 144, 220, and 440. The radio's extended range makes it equally impressive, with wideband reception and transmission. 

It is also 3.3V and 5V friendly, making it easy to power directly from your compute board (Arduino ARM, etc). Raspberry Pi is now supported, too!

Voice and packet radio data are supported in our library, along with CTCSS decoding/encoding, tone (DTMF or custom) decoding/encoding, and Morse code encoding/decoding support. 

HamShield Mini does not require special power supplies. It can be powered on either 3.3V or 5V, and ample current is available on most computing boards and arduinos.

This is the HamShield Mini only. No power connector or antenna is provided. This uses a standard SMA antenna, which some of our users may already have. Since this is an amateur radio kit, soldering of the SMA antenna and headers are required (but we promise it's easy!). 

If you are looking to purchase a great antenna for the HamShield, we now sell the Super Elastic Signal Stick


100% library compatibility with HamShield on Arduino, with libraries for additional processors and environments coming soon!

Power Output: 200mW

Form Factor: Mini stackable shield for Hertzduino

Control Pins: I2C; GPIO, PWM and ADC

Frequency RX/TX: 134-174MHz, 200-260MHz, 400-520MHz

Amateur Radio Bands: 2 Meter, 1.25 Meter, 70 Centimeter

Transmitter Modes: FM, AFSK packet radio

Power Output: 0.2W

Radio SoC: Auctus AT1846S (Most recent model of the RDA1846)

Channel Bandwidth: Selectable between 12.5KHz and 25KHz

Subaudio Modes: CTCSS, CDCSS (transmit/receive independent)

Advanced Features: Volume, Squelch, VOX, DTMF encode, DTMF decode, tail noise elimination, tone generator, tone detector, RSSI 

Software Features: KISS TNC emulation, morse code encoder and decoder, APRS, and more 

Pre-Emphasis: Can be disabled to assist with digital modes

Antenna Connector: SMA, 50 Ohm (optional tri-band antenna)

Audio Connection: Hardware selectable between TRRS (mobile phone style headset) and Arduino PWM/ADC inputs and outputs, PWM/ADC smoothing filters built in

Input Voltage Range: HamShield Mini offers reduced operating voltages and of either 3.3 or 5 volts and substantially less current needs.

Compatible with the future Hertzduino platform

Power consumption

 Operating Mode 144MHz 220MHz 440MHz
RX 56mA 56mA 57mA
TX (pwr 7 or lower) 174mA 176mA 176mA
TX (pwr 8 or higher) 221mA 210mA 190mA


Skills Required

This kit requires soldering of header and SMA components. You will also need an amateur radio license. You will need an antenna. You will need Arduino or other system development skills in order to operate this radio. There are many example sketches from our library that we have provided.


Instructional Videos on YouTube

Arduino Library on GitHub

HamShieldPy library on GitHub