The MFJ-209 Handheld SWR Analyzer combines three basic circuits; a wide range oscillator, a 50 ohm RF bridge, and a calibrated bridge unbalance indicator. This combination of circuits allows measurement of the SWR (referenced to 50 ohms) of any load connected
to the ANTENNA connector.
The MFJ-209 covers all ham bands from 2 meters to 160 meters. The dial calibration is approximate and for reference only. The actual frequency may vary from what is marked on the front panel.
The MFJ-209 FREQUENCY switch selects the following frequency ranges:
- 1.8 - 4 MHz
- 4 - 10 MHz
- 10 - 26.2 MHz
- 26.2 - 62.5 MHz
- 62.5 - 113 MHz
- 113 - 170 MHz
A frequency counter can be connected to the "FREQ. OUT" jack (RCA phono) to get a more accurate reading of the frequency. As an alternative to a frequency counter, you can zero beat the output with an HF receiver. See the
section on zero beating the MFJ-209 with a receiver.
The MFJ-209 can be used to adjust or measure the following:
- Antennas: SWR, resonant frequency, bandwidth, efficiency
- Antenna tuners: SWR, frequency
- Amplifiers: Input and output networks
- Coaxial transmission lines: SWR, velocity factor, losses, resonance
- Balanced transmission lines: Impedance, velocity factor, resonance
- Matching or tuning stubs: SWR, resonant frequency, bandwidth
- Traps: Resonant frequency
- Tuned Circuits: Resonant frequency
- Small capacitors: Value
- RF chokes and inductors: Self resonance, series resonance, value
- Transmitter and oscillator Frequencies.
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