Overview

MFJ 259B HF/VHF SWR Analyzers

MFJ 259B HF/VHF SWR analyzers are compact, battery-powered RF impedance analyzers. They combine four basic circuits; a 1.8-170 MHz variable frequency oscillator, a frequency counter, a 50 ohm RF bridge, and an 8-bit micro-controller. The analyzers make a wide variety of useful antenna or impedance measurements, including coaxial cable loss and distance to an open or short. Primarily designed for analyzing 50 ohm antenna and transmission line systems, the MFJ 259B HF/VHF SWR analyzers also measure RF impedances between a few ohms and several hundred ohms. They also function as a signal source and frequency counter. The frequency range of impedance measurement is 1.8 to 170 MHz, in six overlapping bands. The accuracy of the analyzers is enhanced by the use of special microwave zero-bias Schottky detectors with matching compensating diodes. They are compensated to provide the best possible linearity with both high and low impedance loads, making the A/D converter's 1/2 percent resolution the primary limitation.

Can be used to test:

*Antennas: SWR, impedance, reactance, resistance, resonant frequency, and bandwidth
* Antenna tuners: SWR, bandwidth, frequency
* Amplifiers: input and output matching networks, chokes, suppressors, traps, and components
* Coaxial transmission lines: SWR, length, velocity factor, approximate Q and loss, resonant frequency, and impedance
* Filters: SWR, attenuation, and frequency range
* Matching or tuning stubs: SWR, approximate Q, resonant frequency, bandwidth, impedance
* Traps: Resonant frequency and approximate Q
* Tunes circuits: Resonant frequency and approximate Q
* Small capacitors: Value and self-resonant frequency
* RF chokes and inductors: Self resonant frequency, series resonance, and value
* Transmitters and oscillators: Frequency

Documentation

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