MFJ-266 HF/VHF/UHF Antenna Analyzer
Instruction Manual
©
2011 MFJ Enterprises, Inc.
6
4.0 Frequency Selection
The MFJ-266 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:
