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Roy🇨🇦 Profile picture
@GrandpaRoy2
Jan 5, 2025 • 10 tweets • 4 min read • Read on X
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Ukrainian EW expert Serhii “Flash” Bestkrestnov has published a guide to the military use of the TinySA frequency analyzer.
He also provides firmware to make the device with its many settings more accessible.
Below are some of the valuable capabilities of this device.
1/ Image
“The state of the air” can be monitored to determine UHF radio communication frequencies to avoid.
2/ Image
Determining the local level of EW jamming of satellite navigation frequencies for GPS or GLONASS.
Note how these systems use a number of frequency channels.
3/ Image
The presence and intensity of local EW jamming (including friendly jammers) on the control frequency of the FPV you are about to launch.
4/ Image
Detecting the presence of Russian fixed wing reconnaissance UAVs by their distinctive telemetry signals.
With directional antennas, multiple devices this can triangulate their position to cue a Ukrainian fighter FPV.
5/ Image
Detecting the presence and distance (by signal strength) of nearby Russian fixed-wing kamikazes such as the formidable Lancet.
Its distinctive telemetry signal pattern is “double-horned”.
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And crucially, detecting the video transmission signals of nearby Russian Mavics and especially FPVs.
This is the fundamental function of a frontline drone detector.
7/ Image
Image
Google Drive link to the manual, which is in both English and Ukrainian.
8/
drive.google.com/file/d/1rCIZfP…
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More from @GrandpaRoy2

Roy🇨🇦 Profile picture
Apr 13
Ukrainian “Vampire” heavy bomber drones are switching to Starlink communications, allowing operators to stay hundreds of kilometers from the deadly grey zone.
Previously, Vampires relied on radio and GPS for control and navigation—both highly vulnerable to jamming.
1/ Image
GPS jamming or spoofing from Ukrainian electronic warfare (EW) systems, targeting incoming Russian “Geran-2” drones, can also down nearby Vampires.
Starlink provides immunity to EW, and its expanding use magnifies Russia’s loss of Starlink since its disconnection by Elon Musk.
2/ Image
Sources
kyivindependent.com/counterattacki…
t.me/payloadUAV/5906
t.me/infomil_live/2…
Read 4 tweets
Roy🇨🇦 Profile picture
Apr 10
The Russians are very concerned about the emergence of the Ukrainian “Hornet” strike UAV (Russian name: “Martian-2”) from Eric Schmidt's Swift Beat company.
It reportedly has autonomy and terrain-following capabilities that were previously seen on the Russian “V2U” strike UAV.
1/ Image
Here, a Hornet UAV destroys a Russian “Zoo-1M” counter-battery radar.
The medium-range UAV can automatically detect, classify, and lock onto a target, as seen here by the on-screen tag “VEH/ARM” (armored vehicle).
2/
The Hornet is equipped with two daytime cameras that enable GPS-free terrain-following navigation using onboard digital maps, although it also has a simple GPS antenna.
The drone approaches targets at an altitude of 200 meters, and the Russians complain that it is very quiet.
3/ Image
Read 6 tweets
Roy🇨🇦 Profile picture
Apr 9
Ukrainian blogger Maria Berlinska of “Victory Drones” had a revealing conversation with a taxi driver from Russia.

“Late evening, I’m running late for the metro, so I call a taxi.
The driver’s profile appears in the app — high rating, 17 thousand rides.
1/ Image
“I get in, we go. The driver asks for the address again, in Russian. That very Russian that I wouldn’t confuse with anything else. Neither with Russified Kharkiv, nor with Dnipro or Donbas. Russian from Russia.
2/
He tries to insert Ukrainian words, but from the very first notes I understand everything.
We drive through an empty, dark city; his navigator doesn’t work because of the air raid alert.

- I see you’re driving without navigation, have you been in Kyiv long?
3/
Read 17 tweets
Roy🇨🇦 Profile picture
Apr 6
The accelerometer in the flight controller (FC) of an FPV drone measures linear acceleration, helping the FC understand the drone’s current direction and the force with which it is moving.
1/ Image
The solid-state accelerometer has a tiny “proof mass”suspended by springs.
When the drone accelerates or tilts, inertia shifts the mass slightly.
This movement is measured electronically along the X, Y, and Z axes, telling the FC the FPV’s direction and which way is down.
2/ Image
The key feature of an accelerometer is that it detects not just maneuvers, but gravity as well.
To the sensor, the force of gravity feels exactly like a constant upward acceleration.
This allows the drone to sense its own tilt relative to the ground and maintain stability
3/ Image
Read 7 tweets
Roy🇨🇦 Profile picture
Apr 4
The Telegram messenger app was supposedly blocked in Russia on April 1, but I have seen no change whatsoever in the activities of the many Russian channels that I follow.
On his channel, Telegram CEO Pavel Durov explains why:
1/ Image
“😎 Telegram was banned in Russia — yet 65M Russians still use it daily via VPNs, with 50M+ sending messages every day. The government has spent years trying to ban VPNs too.
2/
“Their blocking attempts just triggered a massive banking failure — cash briefly became the only payment method nationwide yesterday. 😂
3/
Read 6 tweets
Roy🇨🇦 Profile picture
Mar 31
Controlled Reception Pattern Antenna (CRPA) satellite navigation systems have played a crucial role in the electronic warfare (EW) struggle between Ukraine and Russia.
These electronic systems provide powerful protection against EW systems that try to jam GPS/GLONASS signals.
1/ Image
GPS signals are extremely weak when they reach earth from the satellites 20,200 km overhead (10^{-16} watts!).
This makes jamming these signals (overwhelming with a stronger signal) relatively simple, and a powerful jammer can prevent reception of GPS signals over a wide area.
2/
That is, if the GPS receiver has a single antenna, as in our cell phones.
A CRPA is an array of four or more antennas that exploit the spatial difference between horizontal signals from ground-based jammers and the generally vertical GPS signals from overhead.
3/ Image
Read 10 tweets

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