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Hughes

Hughes 3814120-100 FM Data Detector Galaxy System Rev B Rackmount Satcom

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SKU:
39442
MPN:
3814120-100-A
Condition:
Used
Availability:
Usually ships within 1-2 business days.
Weight:
14.00 LBS
Shipping:
Calculated at Checkout
  • Hughes 3814120-100 FM Data Detector Galaxy Rev B — front-left three-quarter view with top cover removed showing internal PCB assembly
  • Hughes 3814120-100 FM Data Detector — front panel close-up showing PS1, MIP, EX indicators, Nutation Offset/Gain controls, and Analog Data output
  • Hughes FM Data Detector 3814120-100 — rear panel showing Composite TM In (J1 BNC), Detected TM Data Out (J2 D-sub), PSI Out (J3 BNC), and AC Power inlet
  • Hughes 3814120-100 FM Data Detector — rear panel label close-up: Hughes Satellite Ground Equipment Division, SYS: Galaxy, UNIT: F.M. Data Detector RevB, PN: 3814120-100, SER: 005
  • Hughes FM Data Detector Galaxy — rear panel AC power section showing ON/OFF toggle switch, fused IEC power inlet, and GND post
  • Hughes 3814120-100 FM Data Detector — Hughes Satellite Ground Equipment Division identification label close-up showing system Galaxy, unit F.M. Data Detector RevB, PN 3814120-100, SER 005
  • Hughes 3814120-100 FM Data Detector — top-down interior view showing full PCB layout, wiring harness, and internal subassemblies
  • Hughes FM Data Detector internal — Acopian Model 5EB50 AC to DC Power Module with terminal strip wiring detail
  • Hughes FM Data Detector internal — Vectron Laboratories CO-231 Crystal Oscillator, 10 KHz, S/N 565701
  • Hughes FM Data Detector internal — Hopkins Engineering Co. F65003 Filtered Line Module, 2x6A, 100/240 VAC, 48/440 Hz, UL and CSA listed
  • Hughes 3814120-100-A Rackmount FM Data Detector Galaxy System Rev B
$150.00
Was: $300.00
Current Stock: 1

Sold Out

Description

Hughes 3814120-100 FM Data Detector Galaxy System Rev B Rackmount Satcom

The Hughes 3814120-100 is a rackmount FM Data Detector built by Hughes Aircraft's Satellite Ground Equipment Division for the Galaxy satellite ground system. It receives a composite telemetry (TM) input signal, demodulates the FM data stream, and outputs detected TM data along with a PSI (phase-shift indicator) signal used for nutation measurement and control. The unit is revision B and carries the part number 3814120-100 per the factory identification label on the rear panel.

Specifications & What's Included

  • Manufacturer: Hughes Aircraft — Satellite Ground Equipment Division
  • Part Number: 3814120-100 (suffix -100-A per title data)
  • System: Galaxy (Hughes satellite ground equipment system)
  • Revision: Rev B
  • Form Factor: Rackmount (open-frame chassis, no top cover)
  • Front Panel Indicators: PS1, MIP, EX (LED status indicators)
  • Front Panel Controls: Nutation Offset rotary knob; Nutation Gain switch (100 Hz/V / 1 KHz/V); Analog Data output button
  • Rear Connector J1: BNC — Composite TM In
  • Rear Connector J2: D-Sub 25-pin — Detected TM Data Out
  • Rear Connector J3: BNC — PSI Out
  • Rear AC Power: IEC inlet with fuse, ON/OFF toggle switch, GND post
  • Internal Power Module: Acopian Model 5EB50 AC-to-DC Power Module
  • Internal Filtered Line Module: Hopkins Engineering Co. F65003, 2×6A, 100/240 VAC, 48/440 Hz (UL and CSA listed)
  • Internal Crystal Oscillator: Vectron Laboratories CO-231, 10 KHz
  • Unit only — no accessories or cables included

Applications

The Hughes Galaxy satellite ground equipment system was a Hughes Aircraft-developed earth station platform used for satellite telemetry, tracking, and control (TT&C) operations. FM data detectors like this unit play a core role in ground station receive chains: they accept the composite telemetry downlink, demodulate the FM-modulated data, and pass the clean digital TM stream to downstream recording, processing, or display equipment. The PSI output supports nutation damping loops, which are critical for spin-stabilized satellite attitude control — a common requirement on the Hughes HS-376 and related satellite buses that the Galaxy system was designed to support. This type of specialized ground support equipment dates from the 1970s–1980s era of Hughes Aircraft's satellite ground infrastructure and is primarily of interest today for legacy system maintenance, spare parts, research into Hughes-era satellite ground station architecture, and aerospace heritage collections.

Condition: Used
This Hughes 3814120-100 FM Data Detector (Galaxy system, Rev B) has been inspected and is in good used condition. It was pulled from a working satcom environment where it was in active use. The chassis shows typical light wear consistent with rack-mounted field service use. Internal boards, wiring harness, and subassemblies appear intact and undisturbed. The rear-panel connectors — BNC composite TM input (J1), D-sub TM data output (J2), and BNC PSI output (J3) — show no damage. The front panel indicators and controls are present and intact. Please view our photo set and contact us if you have any questions.
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Warranty Information

We stand behind every item we sell with a 30-day money-back guarantee. If your item arrives not as described, you may return it within 30 days for a full refund. Please inspect your purchase upon arrival and contact us with any questions.
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Additional Information

Brand:
Hughes Aircraft
Model:
3814120-100
MPN:
3814120-100
Secondary Model:
3814120-100-A
Type:
FM Data Detector
SKU:
39442
System Compatibility:
Hughes Galaxy Satellite Ground Equipment System
Revision:
Rev B
Division:
Hughes Satellite Ground Equipment Division
Form Factor:
Rackmount
Connector J1:
BNC — Composite TM In
Connector J2:
D-Sub (25-pin) — Detected TM Data Out
Connector J3:
BNC — PSI Out
Front Panel Indicators:
PS1, MIP, EX LED indicators
Front Panel Controls:
Nutation Offset knob, Nutation Gain switch, Analog Data button
Nutation Gain Settings:
100 Hz/V, 1 KHz/V
Power Input:
100/240 VAC, 48/440 Hz (Hopkins Engineering F65003 Line Module)
Internal Power Module:
Acopian 5EB50 AC to DC Power Module
Internal Crystal Oscillator:
Vectron CO-231, 10 KHz
Country/Region of Manufacture:
United States
Condition:
Used – Pulled from Working Environment
Seller Notes:
Unit only; no accessories. Pulled from a working Galaxy satcom environment.
Condition Notes:
This Hughes 3814120-100 FM Data Detector (Galaxy Rev B) has been inspected and is in good used condition. Pulled from a working satcom environment. Chassis shows light wear; all connectors, indicators, and controls appear intact.
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Condition:
As-Is / For Parts or Not Working
Country/Region of Manufacture:
United States
Application:
Satellite telemetry FM signal detection, ground station
Seller Notes:
Sold as-is for parts or repair. No functionality guarantee.
Condition Notes:
Hughes 3814120-100 Galaxy FM Data Detector sold as-is for parts or repair. Not powered or tested. No functionality guarantee. Cosmetically shows age-related wear. Please view photos and contact us with questions.
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Used – Pulled from Working Environment
Division:
Hughes Satellite Ground Equipment Division
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Nutation Offset, Nutation Gain knob/switches, PS1/MIP/EX indicators, Analog Data switch
Rear Connectors:
J1: Composite TM In (BNC), J2: Detected TM Data Out (D-sub), J3: PSI Out (BNC)
Input Connector:
BNC – Composite TM In (J1)
Output Connector:
D-sub – Detected TM Data Out (J2); BNC – PSI Out (J3)
Power Input:
105-127 VAC or 210-250 VAC, 47-63 Hz (IEC inlet, rear)
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Internal Power Module:
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Satellite telemetry FM data detection, Westar ground station
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MPN:
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Form Factor:
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Front Panel Indicators:
PS1, MIP, EX status LEDs
Front Panel Controls:
Nutation Offset knob, Gain selector (100 Hz/V, 10 kHz/V), Analog Data switch (Nutation/Earth)
Connector J1:
Composite TM In – BNC
Connector J2:
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