JRE UFI-1 Universal Filtered Interface

One filtered interface for almost anything you need to run through the chamber wall — DC, audio, serial data, sensors and control. The UFI-1 gives you eight independent filtered lines and screw terminals that land any device wiring in seconds.

• Eight independent filtered lines for virtually any low-voltage connection — DC, audio, serial, sensor, control
• Passes your signals from DC to ~480 MHz while rejecting cellular, LTE, WiFi, Bluetooth and everything above 700 MHz
• Removable screw-terminal blocks (16–30 AWG, solid or stranded) — connect any device wiring, swap blocks for fast reconfiguration
• No capacitive loading on the signal — unlike capacitor-filtered DB connectors — so it stays clean for sensitive analog and higher-rate serial
• Ideal for: automotive Ethernet, CAN, DSI Bus, BroadR-Reach, 100/1000BASE-T1, FlexRay, 802.3, LVDS, CML, RS-232/422/485, TRS/XLR/AES-EBU audio, 20 mA current loop, and J- or K-type thermocouples
• Fully passive — no active components, no firmware, nothing that could be subverted in a data-side attack
• 100% made in USA
• Greater than 70 dB rejection above 700 MHz, greater than 80 dB from 1 GHz through 6 GHz
• Low DC resistance — up to 250 mA per line at under 1.5 Ω, rated to 60 V
• Rugged machined-aluminum housing
• Works with any RF test enclosure or screen room

The JRE UFI-1 Universal Filtered Interface consists of eight independently low-pass filtered conductor lines built into a machined-aluminum housing that gives exceptional RF shielding. It passes desired signals from DC to ~480 MHz while rejecting everything above 700 MHz — cellular, LTE, WiFi and Bluetooth — so you can carry almost any low-voltage signal across the chamber's shielded walls without opening an RF leak. Connection is by removable screw-terminal block, so there's no soldering and no fixed connector to design around; you simply land your wires.

Audio — microphones, headphones, speakers, TRS connectors, balanced-line XLR, AES/EBU digital audio and similar formats are all handled easily, with the screw terminals making for convenient connection to whatever device cabling you're using.

Serial and industrial — RS-232/422/485 and the like pass with no concern about filtering capacitance loading the data, the way it would with a capacitor-filtered DB-style connector. Industrial measurement signals — J- and K-type thermocouples, 20 mA current-loop devices — pass just as easily.

Automotive — automotive Ethernet in its many connector styles and implementations is straightforward here. A simple swap of the screw-terminal block adapts the interface to the variety of connectors used across automotive devices, fast and easy.

That freedom from capacitive loading is the UFI-1's real advantage for analog and high-rate signals. A capacitor-filtered DB connector shunts each pin to ground through a cap, which loads and rounds off fast or sensitive signals; the UFI-1's inductive low-pass design rejects the wireless RF without hanging that capacitance on your data. High-performance inductors carry up to 250 mA per path at a DC resistance below 1.5 Ω and a 60 V rating, so the lines handle real working signals, not just instrumentation-level ones.

The fully passive design carries the same advantage as the rest of our filter line: no active components, no firmware, nothing in the signal path that could be compromised — which, with 100% USA manufacturing, makes the UFI-1 an easy fit for defense and security work.

The UFI-1 is supplied with two 12-inch (~30 cm) pendant cables — an RJ-45 modular connector on one end and a removable 8-position screw-terminal block on the other — plus a small flat-bladed screwdriver to aid in wiring. Additional terminal blocks are available from JRE Test or from most electronic distributors, and accept 16-to-30 AWG wire, solid or stranded.

Reliable shielding starts at the mounting. The UFI-1 secures to the enclosure wall with a ring of 4-40 screws (drilling template included for standalone installation), drawing the filter flange flat and tight against the wall around its entire perimeter. We have tested competitive filters that use a single center hole and a large securing nut — those are prone to leakage, because the coarse nut thread never seats the body reliably flat, and a single mechanical anchor works loose over time. Even a tiny loss of contact pressure opens an RF leak. Every UFI-1 specification is measured with the filter installed in an enclosure, and it holds that performance no matter how many times the connectors are mated or the filter gets bumped and jostled on the bench. The compact footprint also leaves room for more filters on the same I/O plate.

Download hole pattern and drawing: UFI-1 LAYOUT
Mounting screws are 4-40 and included with filter. Clearance hole size is 0.1285" diameter - #30 or 3.3mm drill

• Eight independent RF filtered lines
• DC power passing, low resistance of <1.5 ohms/line
• Heavy duty machined aluminum case for reliable shielding and ruggedness
• Precision designed filtering for minimal ringing on data lines
• Excellent RF filtering at all wireless frequencies

Impedance in balanced configuration: 100 Ohms typical

Typical Insertion Loss (all eight signal lines):

• 10 MHz  0.1 dB
• 150 MHz  1.2 dB
• 250 MHz  1.5 dB
• 350 MHz  2.0 dB
• 480 MHz  3.0 dB
• 700 MHz  > 70 dB
• 800 MHz to 6 GHz > 80 dB

Outside: 2" H x 3.2" W x 0.8" D (50 x 80 x 20 mm)

RJ-45 Female Jacks with included screw terminal blocks

Filtering: All 8 lines independently filtered

Power capability: Up to 60 VDC at 250 mA, 1.5 ohms max DC resistance

JRE Test’s RF Shielded Test Enclosures deliver real value and save time over in-house fabricated test solutions. Our fast off-the-shelf delivery, unbeatable price and performance make us the first choice for all your RF test needs. The industry's widest line of enclosures provides superior RF isolation from 10 MHz to over 6 GHz, covering the entire range of popular commercial, private and government communications systems. Whether you are designing, integrating, or conformance testing the next generation Wi-Fi, WLAN, 3G Cellular device, you can rely on JRE Test to provide a seamless solution that is compatible with today’s technology and is ready for the future.