Modem Long Range 433MHz: UM12 - Includes Antenna and Cable

Replacement: None. We are no longer selling these modems, but have a look at our other wireless solutions. This page is for reference only.

433MHz Long Range Radio from HAC. These small modems use a seamless serial interface - whatever serial character enters the TX pin at 1200bps shows up on the other unit’s RX pin. All buffering and error detection is handled internally. And the best part - with 10mW output, it reaches over 1000m!

This unit can be attached to TTL level serial (for microcontrollers) or directly to RS232 for incredibly simple serial cable replacement!


  • Operating Voltage: 3.3V-5.5V
  • 1200bps over 1000m
  • Modulation type: GFSK
  • 8 Channels jumper selectable
  • Low power : 30mA RX, 40mA TX, 20uA Sleep
  • Small footprint size: 26x47mm

Supported Antennae: Kit comes with ¼ wave 50Ohm antenna and communications cable!

Sold in single units.

Customer Comments

  • Anyone know where to get a similar 9 pin cable? I want to use one to prototype with and another to wire into place in the final enclosure.
    I haven’t seen one similar in SFE’s inventory here.

  • can this antenna work with the 1-20 frid and arduino?for the arduino,uno or romeo type can be used with this antenna?

  • I have two arduinos
    if i buy two of these
    can i connect two cable to each arduino (tx/rx)
    and then if i serial print something on the one arduino that message goes to the second one
    and the reverse?

  • Are these transmitters full-duplex? Can they send & receive at the same time?

Customer Reviews

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