MFJ-266B HF/VHF/UHF Antenna Analyzer
Instruction Manual
2012 MFJ Enterprises, Inc.
Version 1D
6
4.0 FREQUENCY SELECTION
The MFJ-266B covers the HF region (1.5-71 MHz) in six bands, plus
VHF (85-185 MHz) and UHF (300-490 MHz). Tuning and band-
selection are electronically switched for high reliability.
4.1 Variable Tuning
The TUNE control uses an instrumentation-grade potentiometer with a
10:1 drive reduction to ensure gradual tuning on each band. Note that a
mechanical lock is provided on the side of the TUNE knob assembly.
The lock is used to prevent accidental changes once a desired frequency
is set.
Dial Lock
TUNE
4.2 Range Selection
BAND SELECT buttons A and B are used to toggle between the HF,
VHF, and UHF ranges. Follow the up/down position prompts shown in
the table printed next to the buttons to select ranges.
A
B
BAND SELECT
BAND A B
HF X
VHF
UHF
Counter X
X means the VHF/UHF switch can be in either position. Tuning is
continuous in the VHF and UHF ranges. The frequency readout line of
the display shows both the operating frequency in MHz and the letter of
the selected range.
Band V:
85 to 185 MHz (FM, Airband, 2 Meters, 2-Way)
Band U:
300 to 490 MHz (Military, 70-cm, 2-way)
4.3 HF-Band Selection
The UP and DOWN buttons are used to step or scroll through a selection
of six HF bands. To step up or down in one-band increments, quickly tap
the appropriate switch to initiate each change. To scroll, press and hold
the switch down. Most users find it easier to watch the letter designation
for the desired band rather than watch the frequency display when
making a selection:
A:
1.5 to 2.7 MHz (160 Meters)
B:
2.5 to 4.8 MHz (80/75 Meters)