This read-write object masks or unmasks the Rx AGC alarm: unmasked(0) or masked(1). The AGC alarm fires when the automatic gain control detects a signal level outside its normal operating range, so masking it suppresses that specific alarm from being reported even if the underlying condition persists -- useful for a demodulator intentionally run near the edge of its AGC range where the alarm would otherwise be a constant nuisance. If a particular demodulator chronically operates near a weak signal threshold that's expected and tolerated, an admin might set this to masked(1) for that unit specifically to stop it from cluttering the alarm log while still monitoring the actual Eb/No value directly.