MFJ-249D is like MFJ-259D, but less analog meters. Reads SWR, true impedance magnitude and frequency on LCD module. Has nicd/nimh charging circuit, can use MFJ-259D accessories.
- 280 kHz - 230 MHz Antenna SWR Analyzer
- Compact, Battery-Powered RF Impedance Analyzer
Combines 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.
This analyzer makes 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 249D Analyzers also measure RF impedances between a few ohms and several hundred ohms.
The MFJ-249D also functions as a signal source and frequency counter! It's frequency range of impedance measurement is done with several overlapping bands.
The accuracy of the analyzer 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.