A- Antenna fades on receiver A
B - Antenna fades on receiver B
L - Antenna fades on the left receiver
R - Antenna fades on the right receiver
F - Frame loss
H - Holds

An antenna fade represents a loss of a bit of information on that specific antenna. Typically, it’s normal to have as many as 50 to 100 antenna fades during a flight.

A frame loss represents simultaneous antenna fades on all attached receivers. If the RF link is performing optimally, frame losses per flight should be less than 20.

A hold occurs when 45 consecutive frame losses occur. This takes about one second. If a hold occurs during flight, it’s important to re-evaluate the system, move the antenna to a different location and/or check to make sure the transmitter and receivesr are all working correctly.