MFJ-269 Instruction Manual HF/VHF/UHF SWR Analyzer
19
“ADVANCED 1”
Magnitude and phase of load impedance
(Section 5.4.1)
Series and Parallel Equivalent Impedances
Return Loss and Reflection coefficient
Resonance
Match
Efficiency
“ADVANCED 2”
Velocity Factor setup
(Section 5.5)
Distance to Fault measurement
Line length in degrees calculation
“ADVANCED 3”
Charavteristic Impedance setup
(Section 5.6)
Normalized SWR impedance (display only)
Coax
loss
* UHF operation:
The following modes are available from each of these
“ADVANCED”
menus:
“ADVANCED 1”
Return Loss and Reflection coefficient
(Section 5.4.2)
Match
Efficiency
“ADVANCED 2”
Velocity Factor setup
(Section 5.5)
Line length in degrees calculation
5.3 General Connection Guidelines
a.) The
ANTENNA
connector (Type “N” female) on the top of the MFJ-269 provides the RF measurement
output connection. This port is used to measure SWR or perform other RF impedance measurements, with the
exception of the Frequency Counter mode.
The
ANTENNA
connector supplies about +7 dBm output into 50 ohms (~ .5 volts RMS), and appears like a 50
ohm source resistance (open circuit voltage ~1 volt RMS). Harmonics are at least 25 dB down over the operating
range of the MFJ-269. While the VFO is not stabilized, it is useful as a crude signal source.
The
ANTENNA
connector is not dc isolated from the load, external voltages will couple directly into internal
detectors.
Warning:
Never apply external voltages or RF signals to the antenna connector. Protect this port
from ESD.
b.) Use proper RF connections. Keep leads as short as possible when measuring components or non-matched
systems. Interconnecting transmission lines or wires can modify readings, including impedance and SWR. Use
properly constructed coaxial cables of known quality matched to the analyzer impedance to avoid introducing
SWR errors.
5.4 Advanced 1 modes