Description
3dbm 70MDF-DAT-BRZ Dual Port RF AM Satcom FM Modulator Plugin Chassis 70MDF-BRZ
The 3dbm 70MDF-DAT-BRZ is a dual-port RF AM satcom modulator system built around a rackmount plugin chassis manufactured by 3dbm Inc. The chassis houses three interchangeable plugin modules and is designed for satellite communications uplink signal conditioning, providing FM modulation and RF attenuation functions in a single integrated unit. It operates with a compatible Uo upconverter and RF amplifier in a satcom ground station chain.
Specifications & What's Included
- Chassis Model: 70MDF-DAT-BRZ (3dbm Inc.)
- Form Factor: Rackmount plugin chassis, 3 plugin slots
- Plugin 1 — FM Modulator: 3dbm Model 70FMO-DL-1-3-A-1
- Plugin 2 — RF Attenuator: 3dbm Model 50AT-1-2R (dual-channel, 0–40 dB RF attenuation per channel)
- Plugin 3 — FM Modulator/Controller: 3dbm Model 70MDF-BRZ
- Internal component: JFW Industries Model 50DR-003 RF switching/relay assembly
- Internal submodule: 3dbm 70MGF-DL-AKS-B (visible on interior label)
- Power: 105–125 VAC, 60 Hz; 2A fuse (on 70FMO module rear)
- Main RF Output, Range Calib RF Output, and Tone Input on 70MDF-BRZ rear (BNC connectors)
- FM Modulator rear (70FMO): BNC RF Out (J5), BNC MOD IN (J6), DB9 Status (J7), multi-pin AC power (J8), fuse (J9)
- Attenuator rear (50AT-1-2R): BNC RF1 Input (J1), RF1 Output (J2), RF2 Input (J3), RF2 Output (J4)
- Front panel: Operate/Calibrate toggle switch and meter (70MDF-BRZ), dual RF attenuation rotary knobs (50AT-1-2R), Tone/RF monitor BNCs, green Operate and Calibrate LEDs, red Fault LED
- Front panel indicators: AC ON, RF, FM Modulator ON, and Fault status LEDs
- Country of Manufacture: United States
Applications
The 3dbm 70MDF-DAT-BRZ is part of 3dbm Inc.'s line of satellite communications ground equipment, used in the IF and RF signal chain for satcom uplink stations. In a typical installation, the FM modulator accepts a baseband or tone input and produces a frequency-modulated RF output at approximately 70 MHz — the standard IF frequency used in analog satcom earth station equipment — which is then passed to an upconverter (Uo converter) and RF high-power amplifier before transmission to a satellite. The dual-port architecture allows two independent FM modulation and attenuation paths, supporting redundant or switched uplink configurations common in broadcast, government, and military satcom ground stations. Equipment of this type was widely deployed in analog SCPC (Single Channel Per Carrier) and MCPC satcom systems from the 1980s through the 2000s, and continues to be used in legacy earth station installations where analog IF processing chains remain in service. The 50AT-1-2R RF attenuator module with its 0–40 dB dual-channel attenuation provides precise RF level control between the modulator output and the upconverter input.
This 3dbm 70MDF-DAT-BRZ Dual Port RF AM Satcom FM Modulator Plugin Chassis has been tested and confirmed to be in working order using a compatible Uo Converter and RF Amplifier. All three plugin modules — the 70FMO-DL-1-3-A-1 FM Modulator, the 50AT-1-2R RF Attenuator, and the 70MDF-BRZ controller module — are installed in the chassis. The unit shows normal wear consistent with professional use but is in good overall cosmetic condition. We have had multiple units in stock; the unit shipped may vary slightly from the one photographed but will be functionally equivalent. Please view our photo set and contact us if you have any questions. Please note: We have multiple units in stock — yours may not be the one shown in the photos, however, it will be similar in condition and function.
Warranty Information
Additional Information
Brand: |
3dbm Inc. |
Model: |
70MDF-DAT-BRZ |
MPN: |
70MDF-DAT-BRZ |
Secondary Model: |
70MDF-BRZ |
SKU: |
39328 |
Type: |
Dual Port RF AM Satcom FM Modulator Plugin Chassis |
Condition: |
Used – Inspected and Tested |
Plugin 1 Model: |
70FMO-DL-1-3-A-1 FM Modulator |
Plugin 2 Model: |
50AT-1-2R RF Attenuator |
Plugin 3 Model: |
70MDF-BRZ FM Modulator/Controller |
Included Component: |
JFW Industries 50DR-003 RF component (internal) |
Form Factor: |
Rackmount Plugin Chassis |
Number of Plugin Slots: |
3 |
Signal Type: |
RF AM / FM |
Application: |
Satellite Communications (Satcom) Uplink |
Rear Connectors - FM Modulator: |
BNC RF Out (J5), BNC MOD IN (J6), DB9 Status (J7), AC Power (J8) |
Rear Connectors - Attenuator: |
BNC RF1 Input (J1), BNC RF1 Output (J2), BNC RF2 Input (J3), BNC RF2 Output (J4) |
Rear Connectors - Main Module: |
BNC Tone Input (J1), BNC Main RF Output (J2), BNC Range Calib RF Output (J3), DB9 (J4) |
Power Requirements: |
105–125 VAC, 60 Hz; Fuse 2A |
Front Panel Controls: |
Operate/Calibrate switch, RF attenuation knobs (FM Mod 1 & 2), indicators |
RF Attenuation Range: |
0–40 dB (per FM Modulator attenuator dial) |
Country/Region of Manufacture: |
United States |
Compatible With: |
Satcom Uo Upconverter, RF Amplifier systems |
Seller Notes: |
Chassis with three installed plugin modules as described. Tested working. |
Condition Notes: |
3dbm 70MDF-DAT-BRZ Satcom FM Modulator Plugin Chassis tested and confirmed working with a compatible Uo Converter and RF Amplifier. All three plugins installed. Normal wear. Unit shipped may vary from photo. |
