OR-0024
Salo Oy
Salo, Finland · 1991 – c. 2004
Ser. EM-9538-0140
1995 · effect
Issued as VST3 · AU
Restored 2025 from 1995 hardware.
Salo 8210 — TDMA Buzz
Salo 8210 · TDMA interference reference · restored from unit no. EM-9538-0140 · Salo Oy, Salo, Finland, 1995
The restorer's note
Everyone alive in 1999 knows this sound: the da-da-da-dun a handset pushed into the nearest speaker. It is not noise we added — it is the 217 Hz TDMA frame rate demodulating into the audio, shaped by the 26-frame multiframe. Salo built this rig to study the interference. We restored it to enjoy it.
Acquisition
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The plate
Listening
Listening
Demonstration recordings, prepared at the bench.
The handset, too close
The material plays clean for six seconds; then the buzz arrives at bench settings — Rate at 217 Hz, Pattern set to Voice — the cadence a handset leaves in nearby equipment.
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Voice, Idle, SMS
Pattern is stepped through Voice, Idle, and SMS burst against a held pad — three cadences of the same interference — and Rate then climbs from 100 Hz to 400 Hz.
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Buzz on the line
A call, interfered with deliberately: Drive at 90 % demodulates hard, Bleed crossfades from ring-modulated speech to the injected burst itself, Tone tilts the pulse dark and then bright, and Sync locks the frame rate briefly before it runs free again.
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