Video Sender Jammers

What is a Video Sender Jammer and how does it work?

Our Video Sender Jammers are specially built transmitters which can operate on any frequency within the 2.4ghz ISM band to within 1Mhz resolution.

If you are finding video senders are jamming out your Wireless Network, and cannot contact the owner to ask them to change their channel, then jamming the signal may be the only way to get them to move the channel.

How our jammers work is to operate on a frequency just outside the range of your Wifi channel, so as not to affect the operation of your network, but within the passband of the video sender.

The signal they send resembles the synchronization pulses found on a TV signal, which causes the picture to roll and become distorted. Due to the low duty cycle, interference to Wifi networks is low, but interference to video senders is high.

Furthermore, due to the signal just being a pulsed carrier, the bandwidth is extremely low (around 20khz). This means that unlike Wifi or Video senders, where the power is spread across 20mhz, giving you around 1mW power per Mhz, with our jammers, you get the full 100mW concentrated in one frequency, meaning that you are effectively running 100 times the amount of power, making it possible to jam out video senders from as much as 100 metres away with complete obliteration of the picture (depending on circumstances).

The image below shows a representation of what the jammer does.

You can see the wireless network, in this case operating on channel 2. You can also see the video sender which is obliterating the throughput of channel 2.

In the middle of the video sender you can see a peak. This is the jammer operating. In this situation, the video sender changed channel within about 5 hours, since it was unusable, leaving the Wifi operating without any problems.

As you can also see, the jammer was outside of the passband of the wifi network, so it did not interfere with the Wifi network once the video sender was gone. It has since been installed onto the mast, as a "Interference Guard" on a permenant basis.

What do these devices look like?

The devices themselves use customized firmware within a Buffalo WHR-HP-G54 access point.

This access point is excellent because it offers low level access to hardware registers, allowing us to directly control the frequency, power, remove all modulation from the signal and create the TV sync timing pulses. It also sports a 750mW amplifier, which runs cool as a cucumber at 100mW, giving you the full legal power output.

Being a conventional access point, it does not look out of place or at all suspect if it is dropped in the corner of an office, in a window or suchlike. There are no markings on it to identify it as any form of jamming equipment, and as far as anyone would ever know, it's just a very normal and standard access point (except it's not!)

Ordering

Due to the nature of these devices, we only accept orders from the Trade. With these devices, used irresponsibly, you could cause interference to many legitimate users of the Wireless Spectrum. We therefore will only supply these devices to computer consultants, Wireless Internet providers and similar.

In order to ascertain which model you require, firstly you need to ascertain which frequency your Wifi network runs on (which channel), and approximately the frequency of the video sender.

From this data, we decide which frequency to put the jammer on. For example, if your Wifi network is on Channel 1, and the video sender is on the top end of the 22mhz channel, then it would be logical to put the video sender just high of Channel 1. We call this "Channel 1 High". Looking at this another way, if your network is on Channel 11, and the video sender is just on the bottom end of your channel, we would place the jammer below Channel 11, so we call this "Channel 11 Low".

Very occasionally you will need the run the jammer on your channel. For example, you are on Channel 3, and the video sender is right on your Channel, then you will need the place the Jammer on your channel also. We call this "Channel 3 On Channel". Placing the Jammer on-channel will deteriorate the throughput of your Wifi network by around 25%. However, this isn't too bad, because if you're being jammed, you won't have much (if any) throughput anyway!


The devices cost £149. For more details, please email us - [email protected]

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