MFJ-266 HF/VHF/UHF Antenna Analyzer
Instruction Manual
©
2011 MFJ Enterprises, Inc.
4
(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
(1.)
(D >FC)
Press the “Down” button to select Frequency Counter mode.
(2.)
(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-266 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).
3.4 Antenna Analyzer Mode (U -> ANT)
In this mode, the analyzer's built-in stimulus generator drives a bridge circuit and the unit
functions as a network analyzer. The top line of the screen displays band selection (a single
letter) and the operating frequency in MHz (see Section-4). The bottom line simultaneously
