Issue: It has come to the attention of Horizon Hobby, LLC that the maximum voltage to the Spektrum SPM4649T remote serial receiver should not exceed 7.5 volts.
What To Do: You may use the Spektrum SPM4649T Remote Serial Receiver between the voltages of 4 – 7.5V. Do not exceed 7.5V.
The SPM4649T quad racing serial receiver offers full-range performance with integrated telemetry providing FPV racing enthusiasts with a serial receiver that can transmit vital telemetry data. Like SPM4648, the 4649T offers a 1-wire serial connection that is compatible with most flight controllers and an input for telemetry data such RPM, battery voltage and a whole lot more. Spektrum enthusiasts with telemetry capable transmitters such as the DX6, DX8, DX9 or DX18 can now receive on-demand telemetry data, and by using the voice functionality of compatible G2 transmitters, can have specific telemetry data outputted via the on-board audio system.
Telemetry options include:
Length: 1.2 inch (30mm)
Width: 0.6 inch (16mm)
Height: 0.2 inch (6mm)
Weight: 0.1 ounce (3 grams)
Voltage Range: Receiver: 4.0v-7.5v / Vbatt Port: 6.0v-25.2v