The 1878A is a triple-stub coaxial tuner designed for impedance matching in RF and microwave systems, operating from 0.4 to 1.0 GHz. It uses Type N connectors and features a maximum stub travel of 15.0 inches (38.1 cm) with an inter-stub spacing of 4.6 inches (11.7 cm). Power handling capability is specified at up to 10 W CW at 10:1 VSWR and 25°C, as indicated by the power vs. frequency plot for the 1819A variant which shares the same frequency range and connector type. The tuner introduces variable shunt susceptance through three adjustable, short-circuited stubs to enable broad impedance matching.
There is no specification for physical dimensions beyond stub travel and spacing, and no grade or qualification is listed beyond Maury Microwave's AS9100D and ISO 9001:2015 certifications, which apply to the product line as a whole.
Stub tuners are impedance transformers designed to introduce a variable shunt susceptance into a coaxial transmission line. Maury offers a comprehensive line of broadband stub tuners designed to satisfy the majority of applications whether its to maximize power transfer between a generator and a load or for introducing a mismatch into an otherwise matched system. Spacing between the stubs of multiple-stub tuners will determine its range of impedances that can be matched and the ease of tuning.
| Maury Microwave | |
|---|---|
| Product Category | Calibration Instruments |
| Product Number | 1878A |
| Product Name | Stub Tuner |
| Calibration Signal | Signal / Waveform Generator Output |
