MFJ-266C HF/VHF/UHF Antenna Analyzer
Instruction Manual
Version 2A
4
2012 MFJ Enterprises, Inc
3.2 Main Menu Screen
The main menu screen has two purposes:
(1.)
Power Supply Voltage:
Appears on the right side of the screen. If it
falls outside the 3.5 to 5V operating window of the battery packs, be sure to
change batteries or make power supply adjustments.
(2.)
Operating Mode Prompt:
On the left side of the screen. This prompts
you to select between the two primary operating modes (see below).
D >FC DC:12.00V
U >ANT Analyzer
Supply Voltage
"Down" for Counter
"Up" for Antenna Analyzer
(3.)
(D >FC)
Press the “Down” button to select Frequency Counter mode.
(4.)
(U > ANT Analyzer)
Press the “Up” button to select the Antenna
Analyzer mode.
3.3 Frequency Counter Mode (D -> FC)
In this setup, the MFJ-266C functions as a 1-500 MHz frequency counter.
Note that the
BAND SELECT
switch
B
must be
"up"
in the
HF
position for
the counter mode to activate.
If switch B is down, an error message will
prompt you to change the band setting to HF.
A
B
BAND SELECT
BAND A B
HF X
VHF
UHF
Counter X
UP
When a signal is applied to the Antenna jack, the frequency is displayed in
MHz. Two gate speeds are available. The default gate speed is
Fast
(or
Fg
--
see the top right-hand side of the display). The fast gate provides 1-kHz
resolution. The alternative gate speed is
Slow
(or
Sg
), which provides 100-
Hz resolution. To change the gate speed:
(1.) For
Fast Gate,
press the
UP
button.
(2.) For
Slow Gate:
press the
DOWN
button.
Fg f: 010.000 MHz
REF FS: 100mV
Gate Speed
Frequency Readout
Relative Field Strength
The Counter mode also provides relative
Field Strength
(
REF FS
). This
feature is useful for conducting relative field-strength tests, estimating input
levels to the counter, and detecting local signals that could impact SWR
accuracy (see Section 7.2).
