HP Hewlett Packard J752C 10 dB Directional Coupler Waveline 401-NF Waveguide

HP Hewlett Packard J752C 10 dB Directional Coupler Waveline 401-NF Waveguide

The Hewlett Packard J752C is a 10 dB waveguide directional coupler designed for microwave signal sampling, power monitoring, and measurement applications. It features a long rectangular waveguide mainline body with circular waveguide flanges at each end and two Waveline 401-NF N-type coaxial adapters fitted at the coupled and through ports. Made in the USA and carrying HP's U.S. Patent 2,871,452, this is a precision passive RF component built to HP's exacting standards for laboratory and field microwave work.

Specifications & What's Included

• Manufacturer: Hewlett-Packard (HP)
• Model: J752C
• Type: Waveguide Directional Coupler
• Coupling Factor: 10 dB
• Waveguide Body: Rectangular waveguide, olive/gray painted metal construction
• Terminations: Circular (round) waveguide flanges at each mainline port
• Coupled Port Adapters: Two Waveline 401-NF N-type (N-female) waveguide-to-coax adapters
• Country of Manufacture: United States (Made in USA)
• U.S. Patent: 2,871,452
• Included: HP J752C directional coupler with both Waveline 401-NF adapters fitted

Applications

Waveguide directional couplers are passive microwave components used to sample a controlled fraction of the signal traveling along a transmission line — in this case, 10 dB below the main signal level — without significantly disrupting the primary signal path. They are standard tools in microwave test setups for measuring forward and reflected power, monitoring signal levels, connecting power meters or spectrum analyzers to a live signal path, and making swept-frequency measurements. The J752C's rectangular waveguide format places it squarely in the microwave frequency range suited to that waveguide size, and the Waveline 401-NF adapters allow connection to standard N-type coaxial instruments. Hewlett-Packard produced this style of precision waveguide hardware primarily from the 1950s through the 1980s, when waveguide-based microwave bench setups were common in radar, satellite, communications, and defense electronics labs. Today, units like this remain in use for legacy microwave system maintenance, antenna range work, and university or government lab applications where rectangular waveguide infrastructure is already in place.