Decom Systems DSI 7376-41000-012-333 PSK/PCM Bit Synchronizer Rackmount

Decom Systems DSI 7376-41000-012-333 PSK/PCM Bit Synchronizer Rackmount

The Decom Systems Inc. (DSI) Model 7376 is a rackmount PSK/PCM Bit Synchronizer combining a PSK demodulator section and a PCM bit synchronizer section in a single chassis. Designed for telemetry and satellite communications ground station applications, it recovers and synchronizes PCM-encoded digital data streams from PSK-modulated RF inputs. The front panel provides a PSK Demodulator section with input bandwidth and source selection, a loop/sync meter, and VCO balance control, alongside a PCM Bit Synchronizer section with PCM code mode selection, bit rate adjustment, polarity switching, and a second loop meter. The unit was manufactured by Decom Systems Inc. of Carlsbad, California and carries model number 7376-41000-012-333 with assembly number 010226-1 F.

Specifications & What's Included

• Manufacturer: Decom Systems Inc. (DSI), Carlsbad, CA
• Model Number: 7376-41000-012-333
• Assembly Number: 010226-1 F (EVO-0491)
• EVO Variant (model): EVO-0380
• FSC/M Number: 55744
• Form Factor: Rackmount (2U approximate)
• Country of Manufacture: USA
• PSK Demodulator Section:
• Input Bandwidth: Narrow / Wide selectable
• Input Source: 1 / 2 selectable
• Loop Meter: Analog (LBE / CI / UBE)
• Sync Indicator: Green LED
• VCO Balance: Front-panel knob
• Front-panel BNC test connectors: Bit Sync / Data In, Data Out, CLK Out
• PCM Bit Synchronizer Section:
• PCM Code Modes: NRZ-S, NRZ-M, NRZ-L (NRZL), NRZ-I, BI0S, BI0B, DMS, DM8, PN
• Bit Rate: Knob-selectable (positions 1–5 visible on front panel)
• Polarity: Normal / Invert switch
• PSK Demod Input Select: PSK Demod / External switch
• Loop Meter: Analog (LBE / CI / UBE)
• Sync Indicator: Green LED
• VCO Balance: Front-panel knob
• Rear Panel Connectors:
• J1 – Demod In 1 (BNC)
• J2 – Demod In 2 (BNC)
• J3 – Bit Sync Ext In (BNC)
• J4 – NRZL Out (BNC)
• J5 – Clock Out (BNC)
• J6 – Demod Status Out (BNC)
• J7 – Bit Sync Status Out (BNC)
• J8 – BI0 Tape Out (BNC)
• J9, J10, J11 – PN Tape Out (BNC)
• J12 – Signal GND (BNC)
• J13 – Chassis GND (BNC)
• J14 – AC Power (multi-pin circular connector)
• S1 Input Power Select Switch: 115V position
• Fuse: 1/4A / 1/2A (rear panel fuse holder F1)
• Unit only — no manual or accessories included

Applications

PSK/PCM bit synchronizers like the DSI Model 7376 are core components in telemetry ground stations and satellite communications receiving systems. They are used to demodulate phase-shift-keyed (PSK) signals from a satellite or airborne transmitter and then recover the clock and synchronize the PCM data stream for downstream processing, recording, and display. The 7376 supports multiple PCM coding formats — including NRZ variants, biphase, and PN codes — making it compatible with a wide range of aerospace and defense telemetry standards. Equipment of this type was widely used from the 1980s through the 2000s in range telemetry stations, satellite ground stations, airborne data link receiving stations, and flight test programs. Decom Systems Inc. was a specialist manufacturer of telemetry demodulation and bit synchronization equipment based in Carlsbad, California, and their DSI-series products were used extensively in U.S. government, military, and aerospace test range applications. Units like this remain relevant for legacy telemetry system maintenance, range instrumentation, and research facilities still operating period-compatible ground station hardware.