It is crazy: when the signal is corrupted by statistical noise. The disappointment catches up instantly: a) nothing is clear, b) what radio amateur will be glad of the terrible signal!
I bet these stories I had a lot. And fortunately, the problem of statistical noise is completely solvable.
When you are into radio, you often hear about RF Gain and Squelch.Newbies are horrified, having no idea what it is.
In fact, everything is simple – RF is the sensitivity adjustment.If it is simpler, then these are two amazing features that will make the signal amazing and noise free.
And why else should you pay attention to this and how to handle it, I will tell you now.
What is RF gain?
As I said, RF gain means sensitivity adjustment. RF gain describes wireless signaling not by wire but by air. That is, it works like a phone in your home.How is this useful?
Look: if you have ever dealt with CB radio, you know for sure that a huge amount of noise from any place is interfering with successful signal transmission – the nearest channels, the atmosphere, and the astronauts on the space station, the Martians on Mars and anything else.
Actually, there is so much noise that it is a miracle that you receive a signal as a result. And by the way, why do you get a signal if there is so much noise?
The answer is simple – RF gain counteracts noise that increases distance. So, Squelch is a sensitivity filter that reduces the noise in the receiver.
It is interesting that when reducing the noise there is no reduction in receive power. For example, CB noise reduction affects the power that can be reduced.
What is Squelch?
So why do you need Squelch? It is necessary to determine the strength of the signal before you hear this signal.Squelch are usually set at between 9:00 and 3:00.
You need a Squelch control on the CB radio. I would say that this is one of the very important elements of the radio.
Squelch control is important because it sets the threshold within which the signal will come out of the dynamics of your radio.
So when you turn the squelch high, the incoming signal becomes stronger. So, if you need to hear only strong signals, then you need to turn it to the right, and to the left – for the weak.
Why is it regulated? Because statistical noise is also changing. During the day, the noise is different. The reason for this is the charged ionosphere and lively life on the streets of the city.
What is the difference between Squelch and RF Gain?
RF Gain is similar to Squelch. But RF Gain – control gain of radio frequencies.
The perfect signal when both functions work together. The fact is that Squelch filters the signal from noise, and RF Gain controls the range of the received signal.
How Does RF Gain Work On CB Radio?
Important to know: RF gain only works on CB radio. So your CB radio can suppress noise in several ways.
All is OK if you use only RF Gain or you are going to use RF Gain together with the built-in noise reduction function (and with Squelch as well). Everything will work and the signal will be without unnecessary noise.
How to work with RF Gain?
It all depends on where you want to hear the program. If you are going to hear the transmission from afar, then you need to keep the gain wide open.
Conversely, if you want to hear the nearest gear, you need to turn the gain clockwise until you get the desired close signal.
But this use case is neither an axiom nor a commandment. That is why many radio amateurs and drivers do otherwise.
They turn off the Squelch (turned on the radio), turn off RF gain on the CB. Then they include RF gain until the noise disappears completely.
Which way to choose? You decide.However, the second method helps to get rid of intermittent signals. It has a drawback: this kind of “noise cancellation” allows a distant signal to pass through.
Imagine the situation: you are approaching a car. A simple pattern will work here – the closer the machine is to you, the stronger the signals (and volume).
And what if the signal fades? I advise you to increase the RF gain and reduce Squelch on the radio if you choose a “double blow” for the noise and use both RF gain and noise suppressor.
CB types with RF gain
If you read up here, then I congratulate you, you have come to an interesting moment.
Not all types have RF gain. What have? I will tell you about it now.
Let’s start with the classics! CB base stations include RF gain. You can see such radio stations in the house or in the office of a company.Besides RF gain, base stations also have a noise filter and an automatic silencer.
Mobile versions of CB radio also have RF gain. Most often it is powerful enough for RF gain and has a single-band transmission (this is not always).
Actually, RF Gain and Squelch can work with any kind of CB. You do not need a specific million dollar model. Any standard radio station will handle this.
And now we have reached the main topic:
How To Connect RF Gain & Squelch?
Real talk this is the most elementary task that you could meet in your life.It is so simple that all you need to do is connect a pair of pens and all is “in the bag”. Only 5 steps:
- You need to turn off your portable radio.
- Turn the Squelch and RF Gain fully counterclockwise.
- Turn on a certain volume level.
- Raise the Squelch slowly until the radio is silent.
- Raise (also slowly) RF Gain until no noise appears, and then slowly reduce it until the noise stops completely.
How is this useful? Such a connection will help to hear the voice, but not to hear the noise.
There are also a couple of tricks here: if you keep Squelch and RF Gain low, then you hear every signal without noise.
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