Sensor Evidence & Hardware Feasibility

This research dossier examines the technical evidence surrounding proposed radiofrequency and directed-energy explanations for Havana Syndrome, now investigated within the broader framework of Directed Energy Bio-Effects (DEBE).

It considers reported RF measurements and sensor evidence alongside the physics and engineering of directional transmission, antenna systems, propagation, power requirements and detection.

A central distinction is maintained throughout: a technology being physically possible does not establish that it was used in a particular incident. Documented measurements, established engineering capabilities, technical feasibility and hypothesis are therefore considered separately.

1. What Sensor Evidence Actually Exists?

Despite extensive investigation of reported incidents, the publicly available evidence does not contain a definitive instrument measurement demonstrating that a particular incident was caused by directed radiofrequency energy.

US agencies have nevertheless developed and deployed sensors in connection with reported incidents. Congressional oversight documents have sought details of those systems, their deployment locations and durations, as well as information concerning emitter signatures obtained by sensors associated with the investigations.

This distinction is important. Evidence that RF-monitoring systems were deployed—and that potentially relevant signals may have been recorded—is not itself proof that a directed-energy source caused a reported incident. Establishing that connection would require sufficiently characterised measurements, temporal and spatial correlation with an event, exclusion of ordinary RF sources, and preferably independent verification.

Consequently, the public sensor record should currently be regarded as incomplete rather than affirmative proof of a directed-energy mechanism.

2. What Would Convincing RF Detection Look Like?

Detecting radiofrequency energy near the location of a reported incident would not, by itself, establish a connection. Modern environments contain numerous RF sources, including mobile networks, Wi-Fi, satellite communications, broadcast transmitters, radar and other electronic systems.

Strong evidence would therefore require considerably more than the presence of an unusual signal. Ideally, monitoring equipment would record the event while symptoms were occurring, allowing investigators to compare the timing of the reported experience with the characteristics of the detected RF emission.

Particularly important measurements would include the signal's frequency, pulse width, pulse-repetition frequency, peak and average power density, modulation characteristics, duration and direction of arrival. These parameters could then be compared with experimentally established conditions associated with the microwave auditory effect and other proposed biological effects.

Investigators would also need to exclude ordinary transmitters, interference, equipment malfunction and reflections or multipath propagation. Repeated detection of a distinctive signal during separate incidents—particularly if its direction of arrival could be established—would provide substantially stronger evidence than an isolated unexplained RF measurement.

The strongest evidence would combine several independent observations: a temporally correlated RF signal, characterised waveform parameters, directional information, corresponding sensor records and independently documented effects in the exposed individual.

Until evidence of this quality is publicly available, sensor data can inform the investigation but cannot independently establish that a directed RF exposure caused a particular Havana Syndrome incident.

3. Directionality, Antennas & Beamforming

Radiofrequency energy does not necessarily radiate equally in every direction. Directional antennas can concentrate transmitted energy into a particular region of space, while phased-array antennas can electronically steer a beam by controlling the relative phase and timing of signals transmitted by multiple antenna elements.

These technologies are well established and are used in applications including radar, satellite communications and modern telecommunications. More advanced electronically scanned arrays can redirect beams rapidly without physically rotating the antenna and can dynamically track moving objects.

Directionality is relevant to hypotheses surrounding Havana Syndrome because some individuals reported effects that appeared spatially localized or directional. In principle, a directional RF source could expose one location more strongly than surrounding areas. That engineering capability does not demonstrate that such a system was responsible for any reported incident.

Real environments also complicate the picture. RF signals can be absorbed, reflected, scattered or attenuated by walls, windows, building materials, terrain and other objects. Beam width and achievable power density also depend on wavelength, antenna aperture, distance and transmitter characteristics.

Any proposed directed-RF explanation must therefore be evaluated quantitatively. It is not sufficient to establish that beamforming exists; a credible hypothesis must show that an appropriate RF waveform could reach the relevant location with the necessary characteristics while remaining consistent with the physical environment and available evidence.

4. Power, Distance & Portability

A technically plausible RF mechanism must satisfy more than waveform requirements. It must also deliver sufficient energy to the relevant tissue at the required distance while accounting for losses between the transmitter and the target.

The microwave auditory effect is unusual because perception depends strongly on pulse characteristics and peak power, rather than simply on average transmitted power. Short pulses can produce rapid thermoelastic expansion while the average energy—and therefore average heating—remains comparatively low.

Distance nevertheless matters. As separation increases, achieving a particular power density at the target generally requires greater transmitted power, increased antenna gain, a narrower beam, or some combination of these factors. Frequency, antenna aperture, atmospheric losses, building materials and the geometry of the exposure also influence what reaches the target.

This makes portability an important engineering question. Demonstrating that a laboratory transmitter or large radar system can produce relevant RF conditions does not establish that the same effect could be produced by a small concealed device at substantial range. Any proposed system has to accommodate the transmitter, power supply, antenna aperture, cooling requirements and control electronics needed to generate and direct the required waveform.

Conversely, modern high-gain antennas, electronically steered arrays, solid-state RF electronics and programmable waveform generators mean that technical feasibility cannot be assessed simply from the size of historical microwave equipment. A proposed configuration has to be evaluated using its actual frequency, distance, antenna gain, pulse parameters and required power density.

The relevant question is therefore not simply “Could RF do this?” but “What hardware would be required to produce the necessary exposure under the conditions of the particular incident?”

5. Could Existing Radar Hardware Be Relevant?

Modern radar systems can generate precisely controlled radiofrequency pulses, direct RF energy using high-gain antennas or electronically steered arrays, and alter characteristics such as pulse width, pulse-repetition frequency and modulation. Tracking radars can also continually adjust their beams to follow moving targets.

These are established engineering capabilities. They overlap with several technical requirements relevant to producing controlled pulsed RF exposure: a powerful RF source, programmable waveform generation, directional transmission and target tracking.

That overlap raises a legitimate technical question: could radar-derived hardware be configured to generate pulse parameters capable of producing the microwave auditory effect?

The existence of suitable components does not answer that question by itself. A radar designed for detection and tracking is optimized for a different purpose. Demonstrating an MAE-capable configuration would require showing that the system could generate the necessary pulse characteristics and deliver an appropriate exposure at the target under realistic conditions.

My technology-focused hypothesis proposes one possible architecture in which programmable radar hardware, alternative waveform profiles, beam steering and software control could be combined to produce MAE-compatible exposures. The paper further considers whether modern tracking and signal-processing systems could extend capabilities demonstrated in historical laboratory experiments. 

This proposed adaptation should be distinguished from established radar technology. Modern radar and electronic beam steering are established; their deliberate use to produce microwave-auditory effects against individuals in reported Havana Syndrome incidents has not been demonstrated by the publicly available evidence.

6. Detection, Monitoring & Attribution

If a directed RF source were responsible for a reported incident, detecting the transmitted energy would be one of the strongest potential routes to establishing what occurred. A suitable monitoring system could record characteristics such as frequency, amplitude, pulse timing, modulation, bandwidth and direction of arrival.

Detection would nevertheless be challenging. Modern environments contain many legitimate RF emissions, while reflections and multipath propagation can cause signals to arrive from several apparent directions. Investigators would therefore need to distinguish an unusual emission from ordinary communications, radar, interference and changes in the surrounding propagation environment.

Multiple synchronized receivers would be particularly valuable. Comparing time of arrival, angle of arrival, phase, amplitude and Doppler information across different locations could help characterize an emission and potentially constrain its direction or source region. These are also among the measurement types considered in RF sensing and reconstruction systems. 

A persistent monitoring system could additionally establish a baseline RF environment. New observations could then be compared with predictions of what should normally be present. An unexplained residual might indicate a new transmitter, changed waveform, moving object, propagation change or interference—but would not uniquely identify its cause. Multiple independent measurements would be needed to reduce that ambiguity. 

Even a well-characterized anomalous transmission would not automatically establish attribution. Investigators would still need to determine where the signal originated, what equipment generated it, whether it coincided with the reported symptoms and whether there was evidence connecting the source to a particular operator or organization.

The evidentiary chain is therefore:

Detection → characterization → localisation → correlation with an incident → identification of equipment → attribution.

Each step requires additional evidence. A failure to distinguish these stages risks turning an unexplained RF signal into an unsupported conclusion about its source or purpose.

7. What Does the Evidence Currently Establish?

The available evidence supports several different levels of conclusion, and these should not be treated as equivalent.

Established: The microwave auditory effect is a genuine experimentally demonstrated phenomenon. Appropriately pulsed RF energy can produce auditory sensations without an external acoustic source, and historical experiments extended the effect to the transmission of meaningful information, including Morse code and limited speech. Modern RF engineering also independently establishes technologies such as programmable waveform generation, directional antennas, electronically steered arrays, digital signal processing and automated target tracking.

Technically plausible but unproven in this context: Combining some of these capabilities could, in principle, provide elements required by a more sophisticated directed-RF system. Questions involving achievable range, beam selectivity, exposure parameters, propagation through real environments, tracking accuracy and practical hardware requirements would need to be demonstrated for a specific proposed configuration.

Not publicly demonstrated: Publicly available evidence does not establish that an integrated system combining these technologies was deployed against individuals affected by Havana Syndrome. Nor does the public record establish a complete evidentiary chain from RF detection through source localisation, equipment identification and attribution to an operator.

Hypothesis: More extensive architectures—including the integration of RF systems with multi-sensor data fusion, digital-twin-like environmental modelling, identity association, automated emitter selection and AI-assisted control—remain hypotheses requiring experimental and documentary evidence. Individual components may already exist independently without establishing the existence of the combined system.

This distinction is particularly important when considering global or selective-targeting hypotheses. A theoretical RF digital twin could model structure, propagation, occupancy and motion, but it would not inherently know a person's identity; an independent identity-association layer would be required.

Similarly, the theoretical digital-twin architecture itself is explicitly constrained by wavelength, bandwidth, noise, observation geometry and the information actually available to its sensors.

The central conclusion is therefore deliberately limited: established science demonstrates relevant RF phenomena and engineering capabilities, but whether those capabilities were combined and used in any particular Havana Syndrome incident remains unresolved by the publicly available technical evidence.

8. Sources & Further Reading

Foundational Microwave Auditory Effect Research

Allan H. Frey (1962) — Human Auditory System Response to Modulated Electromagnetic Energy

The original experimental paper documenting microwave-induced auditory perception.

Don R. Justesen (1975) — Microwaves and Behavior

Includes discussion of subsequent MAE research and the Walter Reed Morse-code and limited speech demonstrations.

James C. Lin (1978) — Microwave Auditory Effects and Applications

Detailed treatment of the physics, dosimetry and proposed thermoelastic mechanism underlying microwave auditory perception.

Official Assessments

National Academies of Sciences, Engineering, and Medicine (2020) — An Assessment of Illness in U.S. Government Employees and Their Families at Overseas Embassies

The expert assessment that considered directed, pulsed RF energy the most plausible mechanism among those examined for the distinctive acute symptoms it evaluated, while emphasizing substantial uncertainty.

U.S. Intelligence Community Experts Panel (2022) — Anomalous Health Incidents Experts Panel Findings

The technical panel that concluded pulsed electromagnetic energy, particularly RF, could plausibly explain the core characteristics of a subset of incidents, while not addressing attribution.

Author's Research & Hypotheses