MFJ-269 Instruction Manual HF/VHF/UHF SWR Analyzer
3
The MFJ-269 also functions as a non-precision signal source and frequency counter. The operating
frequency range of this unit extends from 1.8 to 170 MHz in six overlapping bands, and includes
SWR measurements on 415-470 MHz.
1.1 Typical
Uses
The MFJ-269 can be used to adjust, test, or measure the following:
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
Tuned 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
The MFJ-269 measures and directly displays the following:
Electrical length (feet or deg)
Impedance phase angle(degrees)
Resonance (MHz)
Feedline Loss (dB)
Inductance (
µ
H)
Return loss (dB)
Capacitance (pF)
Reactance or X (ohms)
Signal Frequency (MHz)
Impedance or Z magnitude (ohms)
Resistance or R (ohms)
SWR (Zo programmable)
The MFJ-269 is useful as a non-precision signal source.
It provides a relatively pure
(harmonics better than -25 dBc) signal of approximately 3 Vpp (approximately 20 milliwatts) into 50
ohm loads. The MFJ-269 internal source impedance is 50 ohms. The MFJ-269 is not a stable
generator, but has adequate stability for non-critical applications such as alignment of broad
bandwidth filters and circuits.
Note:
A more complete description of the MFJ-269's features and proper measurement
methods can be found by reading the sections on the particular measurement you
wish to make. Consult the table of contents for the various applications.
1.2 Frequency
Range
The
FREQUENCY
switch selects the following internal oscillator frequency ranges. (A small overlap outside
each range is provided):
1.8 - 4 MHz
27 - 70 MHz
415-470 MHz
4 - 10 MHz
70 - 114 MHz
10 - 27 MHz
114- 170 MHz