Connections
Operation
12VDC
TRANSCEIVER
XMIT ANTENNA
LOOP ANTENNA (DC PASS)
KEY
Connect your linear supply included with the MFJ-1886TR to this port. The power requirements
are 12-14VDC at 500mA.
RF input from your transceiver.
The terminal for the transmit antenna. When off or power is removed the transceiver is
connected to the transmit antenna.
The loop antenna is connected to this port. Do not short the center pin to ground or add a balun
with continuity to ground to this port.
RCA terminal to connect to the SEND or KEY output of the transceiver. This is usually the
connection used to key an amplifier. Check your radio manual for the proper connections.
When off the transmit antenna is selected by default.
When ON the Loop Antenna is connected to the transceiver.
When the KEY line is shorted to ground the transmit antenna is selected and the power is
disconnected from the loop amplifier.
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ON
OFF
Bias-Tee with
Transmit/Receive
Antenna Switch
MFJ-4113TR
POWER
LOOP
ANTENNA
DC PASS
KEY
XMIT ANTENNA
TRANSCEIVER
-
+
12VDC
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