
MFJ-926B HF Automatic Remote Antenna Tuner
Instruction Manual
2010 MFJ Enterprises, Inc.
3
Fast Start
WARNING
●
Never
operate the tuner with its cover removed. Contact with the components inside the
tuner while transmitting will result in painful RF burns.
●
Locate the tuner so that the terminals are
not accessible
during operation. The single wire
connection may have high voltage while transmitting.
●
Disconnect
all antennas from the tuner during lightning storms.
●
Always
tune with low power (2-10 watts). Apply maximum power only after tuning up.
●
Never
exceed tuner specifications.
●
Do
not
transmit with a high SWR for extended periods of time.
1. Connect the transmitter to the
“RF IN/OUT”
coaxial connector on the
MFJ-4117 Bias-Tee
using a 50-ohm coaxial cable. (See Figure 1) This is the RF signal input connector.
2. Connect a 12-15 VDC voltage source capable of supplying at least 750 milli-amps to the “
DC
IN\OUT”
jack on the
MFJ-4117 Bias-Tee.
This is your DC voltage input connector.
3. Connect the
“RF/DC OUT/IN”
coaxial connector on the
MFJ-4117 Bias-Tee
to the
TRANSMITTER
connector on the
MFJ-926B Intellituner
using 50-ohm coaxial cable. The
MFJ-926B Intellituner
will recover the RF and DC signals.
4. Connect your coax-fed antenna to the
ANTENNA
connector using a 50-ohm coaxial cable, or
connect your random wire to the
WIRE
binding post.
5. Connect your ground connection to the
GROUND
post.
6. Key your transmitter to output a carrier of 2-10 watts CW, FM or AM. The SWR should be auto-
tuned to less than 1.5:1. This can be verified with an external SWR meter if desired.
7. You are now ready to transmit at full power.
Note:
During the automatic tuning process, the tuner will make some noise. These are the relays
switching at a very high rate and is normal. Do not be alarmed.
Figure 1:
MFJ-926B and MFJ-4117 Installation Block Diagram
Note:
To use the Random WIRE binding post, make sure to remove the antenna, if any, from
the ANTENNA connector.
MFJ-4117
Bias Tee
MFJ-926B
Intellituner
12-15
VDC
input
1.8-30 MHz
RF
input
DC / RF
ANTENNA
OR
RANDOM
WIRE