[LB7 (OP)]

With Dirac impulsion directly on the wires it is possible to cut all communications: GPS (satellites), drones, military communications, etc. All theses nowadays communications are digital and compressed and they are especially sensible to the perturbations.

Instead of military transceivers it is easy to build  (the military people want to create perturbations but not cut all their communication, here I speak to cut ALL communications, civils, military, etc.) even the device needs an energy. So why they don't use that ?

No need complex electronic, just an asynchronous motor 240 V for example, N ignition coils (or DIY coils), N wires with different lengths (Antennas), a continuous DC voltage 12V for example. The out of the ignition coils are connected to the antennas. One input of each ignition coil is connected to the 0V of the DC voltage source (just 4 diodes with a capacitor is enough to have a DC voltage). The other output of the DC source if connected to the rotor (like a brush, a brush is better but it works with a simply metal stem). The rotor has one finger and it passes (and touch) the other input of each coil, it is like a brush too but with a circular contact. It is possible to use 2 or more independant alternative generators (electrogen for example) and with diode, like the generators are not synchronized, the mean of the current will be not 0 so it is not necessary to use capacitors or DC sources. It is also possible to use the public voltage source (EDF) with an electrogen group in parallel with diodes. The DC source will be not constant but it is not a problem because it is to generate parasites. So, I need only wires, diodes, alternatives or DC sources and iron cores to link the primary and the secondary of the coils. These devices can be small an autonomous, it is possible to let a lot in forests for example in a country and start them at the good time. The economy will be not resist.

[alancalverd]

There was a fashion for enhanced ElectroMagnetic Pulse nuclear weapons in the early Sixties but it is quite easy to protect electronics against EMP. At one time the Soviets were considered way behind the curve for using thermionic valves in their military avionics until it was pointed out that although they are energy-inefficient, they are as mechanically robust as the pilot and much less susceptible to EMP and nuclear radiation than semiconductors (or humans, for that matter). The UK retained electromechanical telephone exchanges for government communications for the same reason.

That pretty much underlines the problem: you need a hell of a lot of energy to knock out an entire communication system, and if it's switched off and surge protected when the bomb goes off, it will probably survive anyway. Far more efficient to position a couple of friendly "trawlers" in the North Sea, listen to everyday radio chatter, identify the frequencies and codes, and just jam the critical bits when you need to.

[Bored chemist]

It's terribly inefficient and not very effective.

There's also a fairly good way round it.
In WWII the Germans produced jammers to block "enemy" radio broadcasts. They were essentially spark transmitters but tuned to the frequency of the station they wanted to block.

The resistance found that they could still hear some broadcasts- specifically those which were transmitted on two channels at the same time.
They found that if you had two receivers, one tuned to each transmitter, and put them on opposite sides of the room, you could hear the signal even though it was buried in the noise from the jammer.
The brain interpreted the two signals as  coming from 3 sources.
Noise from one jammer on the left, noise from the other jammer on the right and sound from the original signal (because it was equally loud from each speaker) in the middle.

Another reason is that, if you spend all your time shouting, you can't hear anything. And the military like to hear what's going on.