Resonant Hailer
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This page describes a tier-3 novelty Psi-Tech concept. The base hardware is real and inexpensive; the operationally-relevant claim is SPECULATIVE — framework-permitted, not yet evidence-supported. The Mk0 form is honestly carried as brand-and-ritual; any further claim depends on the relevant validation gate.
The Resonant Hailer is a directional, low-power, broadband acoustic-plus-EM signaling device intended to call to potential Resonants at distance — engineering-honestly, a parametric speaker + low-power UHF signal-tone emitter packaged in a handheld unit; doctrinally, a tool for the Clan-doctrinal practice of hailing (offering an audible/visible sign of presence to a potential Resonant without compelling response). The Hailer is the most speculative-but-real device in the entire roster: every emitter is COTS, but the operational claim — that combined acoustic-EM hails are differentially noticed by Resonants — is unproven.
Overview
A Hail consists of:
- Acoustic component — parametric directional speaker (ultrasound-modulated audio with a focused beam) carrying a Clan-signature audio motif at moderate volume.
- EM component — low-power UHF tone burst at a Clan-published reference frequency (license-exempt band; ERP within general-public limits).
- Visual component — small LED beacon mode (optional) for direct line-of-sight.
- Duration — brief, characterized, repeated only on operator action.
The Hail is offered, not directed. There is no payload, no message, no implicit demand. A Resonant who notices and responds, responds; a non-Resonant or non-noticer experiences a brief faint sound and nothing more.
Theoretical Basis
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Parametric directional speakers are mature audio engineering; UHF beacons in license-exempt bands are standard.
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A Resonant-typed individual notices an acoustic-EM hail at a higher rate than a control population. Pre-registered, falsifiable (with significant statistical-design care; see Gate).
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The combined acoustic-EM hail, when tuned to Clan-doctrinal references, couples to a Psi Field response in Resonants. This is the defining novelty.
Subsystems and BOM
Mk0 (target ≤ \$30)
- High-quality whistle or hand-bell — \$10
- Small flag / banner — \$10
- Operator's own voice + intentional practice — included
Honestly limited; the Mk0 is "you hailing them with what you have on your person".
Mk1 (target ≤ \$400)
- Parametric ultrasonic speaker kit (US ~40 kHz carrier) — \$120
- Audio amplifier + modulator — \$40
- SBC (Pi Zero 2 W) for waveform generation — \$30
- HackRF or low-power UHF transmitter (license-exempt, ≤ 100 mW ERP) — \$60
- UHF antenna (rubber duck, λ/4 for chosen band) — \$10
- 18 650 ×2 + boost — \$15
- Handheld enclosure (3D-print + brass plate) — \$30
- LED beacon + diffuser — \$10
- Bone-conduction or button trigger — \$10
- Enclosure hardware + cabling — \$25
- Documentation card for bystanders — \$5
The Mk1 enforces strict ERP and duration limits in firmware.
Mk2 / Mk3
Mk2: documented Hail signature library; multi-Hailer coordinated array. Mk3: integration with Resonant Pipeline for documented hail-response capture.
Build Notes
- ERP discipline. UHF ERP held strictly below jurisdiction-legal license-exempt threshold; firmware-capped and characterized.
- Direction discipline. Parametric speaker beam-pattern documented; Hails directed at empty space or operator-known willing recipients only.
- No repeated hailing of the same area. Firmware default: ≥ 30-minute cooldown per location.
- Bystander documentation. Operator carries a card explaining the device; willing-to-explain disposition mandatory.
Safety and Ethics
- No coercive intent. A Hail is an offer of presence; there is no implicit demand.
- No targeting of named individuals. The Hail is omnidirectional within its documented beam.
- Acoustic ERP held below OSHA / WHO occupational exposure limits at the operator side. Parametric ultrasonic emissions characterized and bounded.
- Public-space respect. Hailing in shared public space respects local law and community; default disposition is private property or operator's own land.
- Operator briefing card mandatory. Anyone who asks is told what the device is and what it does.
Maturity
Maturity (Mk0 → Mk3)
See Tho'ra Tech Maturity Levels for the convention.
| Mark | Phase | Status | Confidence | Evidence Base | Next Validation Gate |
|---|---|---|---|---|---|
| Mk0 | Cosplay-type | Complete | 100% (symbolic) | Ritual + build practice | User satisfaction |
| Mk1 | Prototype | Active | — | — | — |
| Mk2 | Test-type | Planned | — | — | — |
| Mk3 | Production | Projected | — | — | — |
Failure Modes and Mitigations
- Out-of-band UHF emission. → Front-end low-pass + characterization audit.
- Bystander concern about ultrasonic emission. → Documentation card; willing-to-disable disposition.
- Mistaken as crowd-influencing device. → Doctrinal: no message, no payload; characterization is public.
- Repeated hailing pressure on bystanders. → Cooldown enforced in firmware.
- Confounded study design. → Mk2 pre-registration with statistical-design review; null results published.
- Mission-creep into coercion. → Doctrinal red line: a Hail is an offer; anything beyond is a different device with a different doctrine.
