What Is a Jammer? | Basics Of a
Signal Jammer Explained

jammer, signal jammer, what is a jammer device

“What is a jammer?” is a question many people are asking these days because of the fuss created, reported and covered by the media. 

To put it simply, a Jammer is, fundamentally, a signal blocking device, which transmits synchronized radio waves on the same frequency range of the device that one needs to blur, therefore preventing devices from transmitting data in the chosen area.

But, before purchasing such devices, you should consider a few important factors:

  1. The blurred frequencies.
  2. The typical jamming coverage.
  3. The installation and the cooling system of the device.

First of all, just to make things clear, there are no such things as universal jammers, capable of blocking all of the existing frequencies. The only device that comes close to such a product is what we, usually, call a Bomb Jammer.

But, there are several issues that have to be taken into account before handling such potentially dangerous devices. Not everyone can afford such equipment because they are expensive.

Secondly, there is the size issue, because they might be a little bulky, since you cannot hold it in your hand or hide it in your pocket, either. The smallest, yet the most complete one can be carried in a backpack, even though its antennas do exceed your height!

In spite of everything, there is one thing that must be said out loud; there is surely no need to jam every frequency unless you are part of a law enforcement agency or other government bodies, in which case it may be understandable.

Our advice to you is to make 100 percent sure you know the frequencies to be blurred and then choose among the numerous products available in our catalog.

So, let’s skip to the third point. Before proceeding with the purchase, make sure you know exactly the distance and the jamming range that need to be covered. The output power of a signal blocker is measured in terms of wattage (W), therefore the more Watts, the more the distance covered and its range.

And finally, although it might seem less important than the two points listed above, there comes the installation and the heat dissipation (cooling system) of the jamming device. Depending on where the device will be installed, you may get the best out of it and exploit it to the nth degree.

Moreover, the potential overheating of a signal jammer results in a reduction of its performance, apart from being detrimental to its internal components. Hence, it is highly recommended that you, absolutely, do not underestimate the importance of this last factor.

If you are looking for a device that guarantees constancy and steady performance, h24, sneak a peek at our different categories on the top menu.


Jammer Frequencies: which ones to choose?

The right frequencies to choose depends on the devices to be jammed. In order to prevent a cell phone from being able to get reception, you should get a cell phone jammer, that blocks cellular frequencies, hence GSM, 2G, 3G, and 4G LTE for the latest Smartphones.

In case you don’t know the frequencies on which mobile phones operate on, don’t worry. We got you covered and we know exactly which frequencies are used in your country.

We will make sure you get the device already configured so that there’s nothing left for you to do than turn it on.

Anyway, be sure to check out our post on how to choose the jammer that best meets your needs before purchasing one in order to avoid ending up with a device that you don’t need at all.


So, what is the recommended output power?

First of all, it is important that you know what kind of jamming disruption you need to create around a certain area. For an all-around 360° view inhibition, you’d better opt for a signal jammer with omnidirectional antennas. 

Pro: Easy to install.
Con: if what you aim to achieve is a disruption in a specific spot, just ahead of you, almost half of the output power will be wasted to cover 180° range behind the point of interest.

On the other hand, if you need to blur frequency transmission towards a certain direction, you should opt for directional antennas.

Pro: the total power of the blocker will be concentrated and directed at a certain area.

Con: Bulky antennas and a more burdensome installation.

Once the typology of antennas has been chosen, what you have to focus on and never underestimate is the so-called signal strength. 

Let’s just say that the stronger the cell phone signal in a location, the more the operating range of our device decreases. No jammer is free from imperfection, they all have their flaws.

Therefore, it is advisable to check beforehand the signal reception in the area where you decide to install the frequency blocker.

Only after having taken into account all of the above-mentioned factors, can you choose the most suitable signal blocker for your needs. Always keep in mind that the more the wattage, the more distance they will be able to cover.


How long can a jammer operate?

It all depends on how the device was built.

The thermal dissipation of a jamming device is the MOST important factor of all. The excessive amount of heat entails the malfunction of the scrambler itself. Loss of strength is the first consequence you will notice, followed by the damage of all of its internal components.

Our selection includes devices with a different range of cooling fans and systems, which will allow you to never exceed a certain warning temperature, thanks to the top-quality materials used for the assembly of the product.

Frequency Chart:
  • 140-180MHz: VHF
  • 400-480MHz: UHF
  • 700MHZ: 4G
  • 850-950MHz: GSM
  • 1575.42MHz: GPS L1
  • 1227.60MHz: GPS L2
  • 1381.05MHz: GPS L3
  • 1379.913MHz: GPS L4
  • 1176.45MHz: GPS L5
  • 1800-1900MHz: GSM DUAL BAND
  • 2100-2170MHz: UMTS – 3G
  • 2400-2500MHz: WiFi and Bluetooth
  • 2600MHz: 4G LTE
  • 5100-5500-5900MHz: WiFi/High Radio Frequency

Let’s take a glance at the most common devices that make use of the above-mentioned frequencies and how we can block them by resorting to a simple jammer:

  • VHF and UHF frequencies are used by the following devices: Bugs, LoJack locators, radio controls, TV antennas, etc.
  • GSM, DUAL BAND, UMTS, 3G, and 4G LTE frequencies are used by cell phones, bugs, telephone alarm diallers, micro-cameras, cameras, GPS trackers, etc.
  • GPS frequencies L1, L2, L3, L4, L5 are used by GPS trackers, satellite navigation systems, smartphones with integrated GPS, etc.
  • WiFi and Bluetooth frequencies are used by WiFi routers, smartphones, earphones, laptops, Bluetooth speakers, drones, and many more wireless devices.
  • High radio frequencies, 5.1GHz – 5.5GHz – 5.9GHz are used by modern WiFi routers, bugs, radio controls, video surveillance alarm systems, drone remote controls, etc.


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