Spektrum AR7100 Series User Manual page 23

QuickConnect with Brownout Detection
The remote receiver included with the AR7100 and AR7100R feature
QuickConnect with Brownout Detection. Should a power interruption occur
(brownout), the system will reconnect immediately when power is restored
and the LEDs on each connected receiver will flash indicating a brownout
(power interruption) has occurred. Brownouts can be caused by an
inadequate power supply (weak battery or regulator), a loose connector, a
bad switch, an inadequate BEC when using an electronic speed controller,
etc. Brownouts occur when the receiver voltage drops below 3.2 volts thus
interrupting control as the servos and receiver require a minimum of 3.2
volts to operate.
Spektrum AR7100
How Brownout Detection Works
When the receiver voltage drops below 3.2 volts the system drops out
(ceases to operate). When power is restored, the receiver will immediately
attempt to reconnect to the last two frequencies that it was connected to.
If the two frequencies are present (the transmitter was left on), the system
reconnects typically in about 4ms. The receiver will then blink indicating
a brownout has occurred. If at any time the receiver is turned off then
back on and the transmitter is not turned off, the receiver will blink as a
power interruption was induced by turning off the power to the receiver.
In fact this simple test (turning off then on the receiver) will allow you
to determine if your system's brownout detection is functioning. Note: If
a brownout occurs in flight it is vital that the cause of the brownout be
determined and corrected. QuickConnect and Brownout Detection are
designed to allow you to safely fly through most short duration power
interruptions. However, the root cause of these interruptions must be
corrected before the next flight to prevent catastrophic safety issue.
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