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View Cart. By Type. By Brand. By Vehicle. Antenna Parts and Accessories. Microphone Parts and Accessories. Radio Parts. Adjusting the squelch is relatively straightforward. You simply set your mic up powered on at the furthest distance or worst case you ever expect to use it and adjust the squelch at the receiver until it just gates off your mic. Then move it back up just a little for an extra margin of safety.
If you squelch something, you stop it from developing or succeeding. The company increased its stake in the business, squelching rumors of a takeover bid. To squelch means to make a wet, sucking sound, like the sound you make when you are walking on wet, muddy ground. A mean remark could squelch your self-confidence, and a powerful military could squelch an invading country. Squelching can also mean to make a squelch-like sucking sound — or to slop, slosh, splash, and squish through the mud.
A squelch or muting circuit is critical to proper receiver behavior in wireless systems. The function of this circuit is to mute or silence the audio output of the receiver in the absence of the desired radio signal. Squelch only affects the signals that your VHF radio receives, not the transmissions that you send. When you make a transmission, your radio broadcasts the same signal, regardless of your squelch setting.
The only way your squelch setting will appear to affect your transmission is if you do not receive a reply. A simple squelch circuit. The function of a squelch is to adjust the sensitivity of the receiver by eliminating unwanted weak signals that cause background noise such as static, hash, or hiss.
To counteract noise, RF gain acts as a sensitivity filter. It reduces noise in the receiver without reducing reception power as a CB radio squelch does. First, start off by leaving your car turned-off if the radio is mobile. Without it, all you would hear is white noise, or static.
Squelch works by filtering out transmissions based on their signal strength. Does that sound like RF gain? It can be confusing. Remember all those pesky transmissions I mentioned above? Every channel on the CB band is crowded with this radio pollution. And all that pollution comes from every direction. More importantly, it comes from all distances, near and far. The RF gain would take care of it with no problems. But that noise comes from base towers dozens of miles away as well as possibly the ignition system of your own truck.
Anything that uses or generates electricity has the potential to create interference that manifests as static noise. So how does squelch filter all this noise out? It works by blocking signals based on their intensity. Someone talking into their mike even dozens of miles away is sending a powerful signal. Their radio makes sure their transmission is nice and strong.
The interference is therefore weak. Everything is allowed through, regardless of the signal strength. When you turn your squelch all the way up, you will hear total silence. Nothing is strong enough to get through. This takes a bit of getting used to, but it is intuitive for the most part.
Have you ever been talking to another trucker several miles down the road, when all of a sudden his transmission got choppy? The reason the transmission got choppy is because the distance between the two of you got too big. If you have RF gain control, you could turn it up in this case.
If you are talking to someone close, but are getting a lot of chatter from other truckers who are a bit further away, you can shut out the other truckers by turning your RF gain down.
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