GR-12L - 16 Channel Serial Telemetry Receiver - Diversity
GR-12L - 16 Channel Serial Telemetry Receiver - Diversity

GR-12L - 16 Channel Serial Telemetry Receiver - Diversity

P/N: S1051


The Graupner GR-12L serial diversity receiver provides up to 16 (8, 12 or 16) control output channels using either SUMD, SBUS or SP2048 digital output signal.

The GR-12L has a dual diversity antenna utilizing the HoTT protocol where it provides frequency hopping over 75 channels using the 2.4 GHz band making it therefore very reliable with minimal influences of external interference.

The GR-12L serial receiver has built in telemetry for RSSI, temperature and receiver voltage and can be expanded with additional HoTT modules such as GPS, voltage modules and more.

The GR-12L serial diversity receiver can operate under a wide range of voltage levels 3.6V to 8.4V (functional down to 2.5V) and with the enhanced receiver sensitivity the operating range has been substantially increased.

The RSSI value can be output at CH8, CH12 or CH16 with SUMD, SBUS or SP2048.

The very compact design and low weight (3 grams) makes it suitable for any multirotor, airplane or helicopter RC model.

The GR-12L serial diversity receiver is designed to interface with third party flight controllers like Betaflight, Raceflight, Potenza, Bavarian Demon or flybarless controllers like Spirit, V-Stabi, Microbeast, Ikon, Neuron, 3Digi or any SUMD/SBUS/SP2048 flight controller.


  • Compact and light design
  • Wide voltage operation for extended reliability 3.6V to 8.4V (functional down to 2.5V)
  • LED indicator shows receiver state
  • Increased receiver sensitivity for extended range
  • Built-in telemetry for signal strength, temperature and voltage
  • Adjustable digital output signal and RSSI setting over HoTT telemetry radio
  • Built-in failsafe and hold functions
  • Telemetry connection for additional sensors and modules


  • Graupner GR-12L Serial Diversity Receiver
  • Small Parts

Great performer in a small package
Not ever having any experience with a single-wire output receiver, I wondered how one output wire on such a tiny package was going to do the job of a common-sized receiver with multiple output cables. I could have chosen any of Graupner’s other excellent flight controller receivers, but curiosity led to the Graupner GR-12L. Coupled with the MZ-24, it can handle a 2S 3600mah Li-Po, can output 8-plus channels, and can be operated with my flight controller, the Flex Innovations Potenza Aura 8 which works with SUMD. Familiarization and setup required some visits to several G-USA threads and their YT videos. For initial use, it was installed into a harmless low-winged sport plane. After bench tests proved the plane flight ready, out to the field I went. Range check was good for what was to be the first flight of a new SUMD receiver on a well-proven plane. The aim was to ensure that this receiver and FC combo would function as designed. My plane responded normally to stick input and switch throws for Dual Rates, Expo, Snap Rolls, Flaperons, Gain Knob, Flight Modes, Gyro On/Off. First flight with this receiver/flight controller combo was successful with no glitches and no problems. Plus, GR-12L sends back battery level readings to the transmitter. Later this month, this combo will be moved into a new plane I am currently working on. I bought another two GR-12L’s for use with an XPS-10+ channel expander board and for use with a Bavarian Cortex. Both items accept SUMD/SBUS signals. There is no more mystery about this receiver. Best point is that it interfaces with several brands of flight controllers on the market. It is not specific only to Graupner radio systems. It’s a surprising performer in a package smaller than the Velcro tape that will hold it. I trust it to carry out its mission.
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Reviewed by: (Verified Buyer)  from San Antonio on 12/11/2019