MFJ-4113TR Instruction Manual
TX/RX SWITCH
2
XMIT ANTENNA
Connect your antenna that you want to use for transmit to this connector.
KEY
This jack should be connected to your transceivers key line. On some ICOM
radios this may be labled as SEND. On other radios, this connection may be
incorperated into the REMOTE or ACCESSORY jack. This is normally the
line that is used to key a linear amplifier. This line must be connected for proper
operation of the switch. Failure to do so will cause RF energy to be sent to the
Receive only antenna and WILL cause damage to it. The MFJ-4113TR should
click when the key line is shorted to ground by the radio. Verify its proper
operation before attempting to use the switch with your antennas.
LOOP ANTENNA (DC Pass)
This is where the receive only antenna such as the MFJ-1886 should be
connected. DC bias voltage from this connector will power the MFJ-1886 in
receive mode and will remove power when the switch is is transmit mode.
Wiring To A Receive Antenna
1.
Connect the Antenna jack
on the transceiver to the
TRANSCEIVER jack on
the MFJ-4413TR.
2.
Connect the Transmit
Antenna to the XMIT
ANTENNA jack.
3.
Connect the MFJ-1886
line or other receive
antennas to the DC PASS
LOOP ANTENNA jack.
4.
Connect the KEY jack to
the transceiver KEY line.
5.
Connect 12 DC volt
power source to the +12V
jack. Center pin is
positive.