MB3A features SQ, ASQ, NB, and ANL functions, which effectively shield against noise and offer clearer sound quality for communication.
SQ and ASQ
A squelch is an electronic circuit that acts as a noise gate for a speaker. The gate shuts out the noise and only opens with a valid voice signal.
In other words, the squelch circuit suppresses background noise and interference when there’s no signal. It mutes the speaker when there’s no detected transmission and only unmutes the user when it detects a signal frequency above the squelch level.
Squelch is divided into two kinds: SQ and ASQ. SQ is a manual adjustment, and ASQ is an automatic adjustment.
MB3A is equipped with 34-level squelch and 9-level auto squelch.
Noise Blanker (NB)
Generally, an NB circuit is a larger circuit that temporarily shuts down the front end of the radio when the antenna picks up high amplitude “spikes,” so you do not hear them. It is quite fast however if you are talking to someone right next to you the NB may pick the signal up as a “spike” and shut down the front end. As a result the person you are listening to will sound muffled. Generally, people use NB for spark plug noise, lightning, or woodpecker noises and chirps.
Auto Noise Limiter (ANL)
ANL is a form of noise reduction that primarily works in the AM mode on your CB radio. Generally speaking, people build it, in most cases, as a circuit around the AM detector of the radio. Its purpose is to stop wideband noise from entering the front end of the radio so you do not hear it. Although the ANL does not affect your “S” meter and you will still see it on the meter, you will not hear the interference. Wideband noise is that buzzing that you hear from leaky or dirty transformers on telephone poles. The type that goes all over the band even when you turn to another channel. The only thing that will remove it is an ANL circuit. In most cases, the Cobra line of radios is the BEST for removing wide-band noise.
Conclusion
With SQ, ASQ, NB, and ANL functions, MB3A increases communication clearer sound quality no matter how noisy the environment is, it will be your good work partner.
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