MSx is a federated, high-mobility Electronic Countermeasures (ECM) platform designed for localized 2.4GHz physical-layer interference research. By utilizing a 4WD carrier, MSx is optimized to analyze the impact of high-output interference on target hardware to test the robustness of embedded IoT nodes and frequency-hopping spread spectrum (FHSS) mitigations.
NOTICE: This repository is for Educational and Security Research purposes only.
- All development and validation of this platform were conducted within a controlled, shielded laboratory environment.
- The author does not condone the unauthorized disruption of licensed communication networks.
- This tool is intended for civil defense strategies and infrastructure hardening research. Full compliance with local telecommunications regulations is the sole responsibility of the user.
MSx utilizes a Distributed Load strategy to ensure real-time stability across three independent microcontrollers. Source code for individual modules can be found in their respective repositories:
| Node | Module | Role | Hardware | Repository |
|---|---|---|---|---|
| C2 Gateway | GDx | Vision / WebSocket Interface | ESP32-CAM | 2K-GH/GDx |
| Execution | GDx | Motor & Gimbal control | Arduino Uno | 2K-GH/GDx |
| Effector | Jx | Physical-Layer Disruption | Gizduino (Arduino-compatible) | 2K-GH/Jx |
To prevent the Jx module from "self-jamming" the MSx control link, the GDx (ESP32-CAM) is reconfigured to operate on Wi-Fi Channel 9.
The Jx effector targets standard non-overlapping Wi-Fi channels using an nRF24L01+ set to a 2MBPS data rate, which creates an approximate 2MHz spread per transmission.
Targeted Frequencies (
- Wi-Fi Ch 1: 2412 MHz (Register 12)
- Wi-Fi Ch 6: 2437 MHz (Register 37)
- Wi-Fi Ch 11: 2462 MHz (Register 62)
While a gap exists between Channels 1 and 6, the selection of Channel 9 (2452 MHz) is mathematically superior for a high-bandwidth MJPEG stream.
- The Ch 1–6 Gap (Center 2424 MHz): Provides a +2 MHz margin from Ch 1 and a +3 MHz margin from Ch 6.
- The Ch 9 Sweet Spot (2452 MHz): Provides a massive +5 MHz safety margin from the high-power Ch 6 interference.
- Verdict: The 5MHz margin provides 2.5x more spectral isolation, significantly reducing Adjacent Channel Interference (ACI).
We optimize the Signal-to-Interference-plus-Noise Ratio (SINR) by exploiting Wi-Fi's native resilience:
-
Asymmetric Protection: While Ch 9's edge sits at
$2462\text{ MHz}$ (Ch 11), it isolates the critical center frequency and the entire lower sideband in a "Quiet Zone". - OFDM Resilience: Wi-Fi can survive edge interference via Forward Error Correction (FEC). In contrast, the narrow Ch 1–6 gap "squeezes" the signal from both sides, which would lead to catastrophic video jitter.
Standard 2.4GHz "rubber ducky" antennas are typically tuned for a center resonant frequency of 2450 MHz.
-
Wavelength Calculation:
$\lambda = \frac{c}{f} \approx \frac{3 \times 10^8}{2.45 \times 10^9} \approx 12.24 \text{ cm}$ . -
Resonance:
$2452\text{ MHz}$ (Channel 9) aligns almost perfectly with the antenna's design center, ensuring a lower Standing Wave Ratio (SWR) and higher effective radiated power compared to Channel 1 ($2412\text{ MHz}$ ).
MSx runs entirely from a single high-discharge power source (7.4V 1400mAh 30C LiPo). The 30C rating is critical for preventing voltage sag during the 115mA peak bursts of the Jx module and simultaneous motor operation.
| MSx Front Profile | GDx Vision Interface |
|---|---|
 |
 |
| 4WD mobile carrier housing the integrated layout of the federated control nodes. | Front-facing view centering the ESP32-CAM gateway for real-time C2. |
Jx Payload: The high-gain nRF24L01+ (PA+LNA) effector responsible for localized interference.
This project is released under the MIT License.