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Inside The ‘Magic Radio’ Protecting Russian Drones From Jamming

FPV drones are a signature weapon of the Ukraine conflict, and jammers to stop them are a matter of life and death. Both sides have fielded jammers and drone guns firing a beam of radio waves to knock out drone communications, said to take out thousands of drones a month. Now a Russian group claims to have developed a ‘magic radio’ for FPVs which is highly resistant to jamming. A physicist with the handle DanielR evaluated the device minutely in a detailed Twitter thread.

“From a technological perspective there is nothing surprising here,” DanielR told me. But the device does make efficient use of cheap, off-the-shelf components.

Racing quadcopters converted into cheap kamikaze drones are used by both sides. They are capable of diving into foxholes and bunkers, chasing down trucks, and even destroying main battle tanks from five or more miles away. Often jamming is the only protection, but this device claims to nullify it.

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Off-The-Shelf Electronic Warfare

The first thing DanielR notes is that while Russian Telegram channels hail the Hermes Anti-interference Communication Kit as an all-Russian creation, it is made with imported parts.

“The Russians removed the labels from the most important piece, but they need not have bothered,” he notes.

The item is still easily identifiable as a RAK3172(H) wireless module made by Chinese company RAKwireless, which DanielR calls “an easy-to-use, small-size, low-power solution for long-range wireless data applications,” available in different radio frequency bands online for $5.99.

This is a device for LoRa, short for Long Range, a radio communication technology designed for low-power wide area networks by electronics giant Semtech in 2014. LoRa has become a standard building block for Internet of Things applications and the hardware is widely mass-produced. This makes it attractive for FPV builders, especially given its flexibility.

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“The LoRa radios have always been able to operate on different frequencies and this ability has been used throughout the war,” says DanielR.

LoRa uses little power and can communicate at up to three miles in urban areas and five miles or more in the open. Many drone operators now use a repeater, carried on another drone, to extend the reach.

DanielR notes that Hermes' “magic antenna with filter” looks like a half-wave dipole antenna. Because the size of antenna corresponds to the radio waves it picks up, he estimates that it operates on a frequency of about 930 Mhz. The antenna is fitted with a balun (short for "balancing unit") and a surface acoustic wave filter, both of which improve performance. DanielR says these too are commodity items costing about $.50 and $0.40 respectively.

The device has a 3D-printed plastic case and is likely operated with an STM32 microcontroller, a standard component in electronic devices made by a company based in Switzerland, with an LED display.

Hermes charges around $140 for a transmitter unit equipped with their technology, which DanielR says should allow for a healthy profit margin. Russian companies are notorious for labelling imported devices as "Russian-made" and charging over the odds, like the infamous rebranded Chinese quadcopters sold as made in Russia at a markup of around 200%. But it is still dirt cheap by the standards of military electronics.

Hermes remove the labels from components but these are still easily identifiable.

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