Open Box MFJ-249D SWR Analyzer, .530-230 MHz without Meters SN162945
Open Box MFJ-249D SWR Analyzer, .530-230 MHz without Meters SN162945. Box has shipping tape on it.
MFJ 249D 280 kHz - 230 MHz plus 2200 Meter Antenna SWR Analyzers are compact, battery-powered RF impedance analyzers. They combine four basic circuits; a 100-140 kHz and 280 kHz to 230 MHz variable frequency oscillator, a frequency counter, a 50 ohm RF-bridge, and an 8-bit micro-controller. These analyzers make a wide variety of useful antenna or impedance measurements, including coaxial cable loss and distance to an open or short. Although primarily designed for analyzing 50 ohm antenna and transmission line systems, MFJ 259D Analyzers also measure RF impedances between a few ohms and several hundred ohms.
They also function as a signal source and frequency counter! Their frequency range of impedance measurement is done with several 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 0.5 percent resolution the primary limitation.