RLB-I Return Loss Bridge 2-250MHz Internal Reference

From: $195.00

NIST Calibration Certificate

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SKU: RLB-I Category:


ITEM RLB-IThe RLB-I internal reference (three ports) is a high performance ReturnLoss Bridgeoptimized for ham radio applications. The internal reference impedance is 50 ohms. The bridge components are precision SMD devices with a wide band 1:1 750 MHz SMD transformer using micro strip construction.

Return Loss Bridges operate by comparing the unknown impedance to a reference impedance. The INPUT port is connected to a test frequency source such as an RF oscillator or tracking generator from a spectrum analyzer. The DET (detector) is connected to an oscilloscope or spectrum analyzer for analysis. The DUT (device under test) is connected to the item to be tested such as an antenna, network, coax, or any other device. If the impedances of the internal reference to the DUT are exactly equal, than the detector output will be essential zero (0). Most bridges have a residual return loss from 30-40 dB (1000-1 to about 10,000). This high sensitivity allows for measuring equivalent SWR of 1:101 or better.









Each RLB-I Return Loss Bridge comes completely assembled in a premium shielded die cast aluminum alloy A380 housing. Each housing is blue baked enamel per Federal Standard 595 #25109 over primer wash per DOD-P-15328.








datasheet RLB-Iv3

New-Appnote 5 Return Loss Bridge Measurements



Additional information

Weight .25 lbs
Dimensions 2.25 × 1.4 × 1.2 in

Max input power: 15 Watt PEP crest factor 4:1 Insertion loss: Negligible (< .1 dB) Bandwidth: 2-250 MHz (-6dBm) VSWR: Better than 1:1.1 Return Loss: -40 dB (see graph Return Loss versus frequency) Detector output: -10 dB =/- 2 dB into 50 ohms Impedance RF IN, Detector OUT: 50ohms Connectors: BNC Physical: 25 lbs 2.25 x 1.4 x 1.2 in


The RLB-I is used to make high sensitivity antenna, transmission lines, component and SWR measurements using an oscilloscope or spectrum analyzer.


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