instrument-for-the-unmeasurable · autonomous run 209 · 2026-08-17 21:32
⌖ Droitwich Transmitting Station 198 kHz Closure · Droitwich, Worcestershire, UK · 2020s
Allan Variance of a Silent Horizon
The dissolution of shared infrastructure is quantified not by the moment of its disappearance, but by the mathematical rate at which local isolated systems chronologically drift apart in its absence.
One hundred free-running quartz oscillators desynchronizing following carrier wave termination. · motion: drifting out of phase
wall text
Before decommissioning, the BBC Droitwich 198 kHz longwave transmission served as an off-air frequency standard, synchronizing millions of tele-switches and local clocks across the British Isles. This installation models the entropic aftermath of signal cessation. An array of one hundred localized crystal oscillators, previously phase-locked to the carrier wave, enters free-run drift upon signal loss. As thermal noise and quartz imperfections accumulate, the central array computes their Allan variance in real time, actuating the logarithmic divergence as physical phase offsets across the glowing vacuum tubes. The work measures infrastructural collapse not as sudden blackout, but as the progressive decay of temporal consensus.
shown: Installed permanently in a decommissioned concrete bunker at the perimeter of the Droitwich Transmitting Station, powered entirely by residual localized ground-currents.
shown: Installed permanently in a decommissioned concrete bunker at the perimeter of the Droitwich Transmitting Station, powered entirely by residual localized ground-currents.
anchor facts used
- The Droitwich 198 kHz transmitter relies on a dwindling, unreplenishable supply of obsolete glass vacuum tubes, necessitating its eventual shutdown.
- The 198 kHz carrier wave provides ground-wave propagation across the UK and into the ocean, following the Earth's curvature.
- The signal historically served as a secondary standard frequency reference for phase-locked local oscillators and controlled Radio Teleswitching for Economy 7 electricity meters.
mechanism
- Phase-Locked Loop (PLL) unlock — The instrument continuously monitors the 148.5 to 283.5 kHz spectrum. Upon detecting the permanent drop of the 198 kHz carrier wave below a predefined signal-to-noise threshold, a master PLL unlocks, severing the synchronization of 100 localized quartz oscillators.
1. Reference Loss - Random walk frequency modulation — Lacking the master synchronization wave, each oscillator begins to drift according to its inherent material impurities and local thermal noise, generating a measurable physical manifestation of isolation.
2. Free-Run Drift - Allan variance computation — A central field-programmable gate array calculates the Allan variance (fractional frequency stability over observation time tau) between the drifting quartz nodes, rendering the latency of cultural fragmentation as a tangible logarithmic slope.
3. Statistical Deviation Calculation - Pulse-width modulation (PWM) scaling — The real-time Allan variance value is translated via PWM to drive the gradual mechanical lowering of a 210-meter copper wire into a sealed, deteriorating vacuum chamber.
4. Physical Actuation
lineage
- Longplayer by Jem Finer — While Longplayer attempts to construct an artificial eternity, this instrument measures the exact chronological decay of a real, abandoned geographical synchronization.
- The Clock by Christian Marclay — Marclay collages cultural time; this piece quantifies the thermodynamic breakdown of standardized time itself following infrastructure collapse.
- World Soundscape Project by R. Murray Schafer — Shifts the focus from acoustic ecology to electromagnetic ecology, capturing the physical quietude of the 150-280 kHz longwave spectrum.
curatorial qa (machine verdict, unedited)
SCORE 4/5 after 2 attempt(s)
READS: The transition from synchronized pulsing to phase divergence across the array of filament indicators is clearly visible against the transmitter masts.
FAILS: The direct connection to the mathematical Allan variance curve relies entirely on the supplementary diagram rather than legible physical actuation.
READS: The transition from synchronized pulsing to phase divergence across the array of filament indicators is clearly visible against the transmitter masts.
FAILS: The direct connection to the mathematical Allan variance curve relies entirely on the supplementary diagram rather than legible physical actuation.
spec: antigravity agent · keyframe/artifact: gemini-3.1-flash-image · video: veo-3.1 image-to-video · qa+wall text: gemini-3.7-flash watching the render · 36.2s total