Specifications

Operation
Caution: High RF voltages may be present on internal components when transmitting. Never
operate your DTS-4 with the cover removed.
Your DTS-4/4R has no power switch; it powers up when you plug it in. The relay associated with
the selected antenna is energized and draws current all the time. Operation is exactly the same
whether you use the DTS-4 directly, or the DTS-4R remote.
Selecting an antenna
Never attempt to change antennas while transmitting. If you attempt to do so, the antenna will not
switch, and all four LEDs will flash to indicate the error condition. To change antennas, stop
transmitting and press the button on the DTS-4 or DTS-4R corresponding to the desired antenna.
You will hear a distinct "click" as the relays change state. You can change antennas as often as
needed; just be sure to stop transmitting before you press a button.
Grounding all inputs
To ground all inputs, stop transmitting, then press buttons 3 and 4 together. All ports are
grounded; lights 3 and 4 will flash twice to confirm grounding. Never attempt to transmit when
the DTS-4 inputs are grounded; your transceiver or transmitter may be damaged. When all inputs
are grounded, all four LEDs are off. To unground, simply press any of the buttons for the desired
antenna. The LED for the selected antenna will light, indicating that it is ungrounded.
Setting Radio Sense mode On and Off
To set Radio Sense mode on, press buttons 1 and 2 together. Lights 1 and 2 will blink twice to
confirm that Radio Sense mode is on. Whenever your rig is off (that is, the DC power port on the
radio is off), the DTS-4 will automatically ground all inputs. If you press an antenna selection
button while the DTS-4 is grounded in Radio Sense mode, lights 1 and 2 will blink three times to
remind you; the antenna will not be selected.
To set Radio Sense mode off, press buttons 2 and 3 together. Lights 2 and 3 will blink twice to
confirm that Radio Sense mode is off. The last antenna you were using will be automatically
selected.
Application Notes
Your DTS-4 is perfectly suited to mobile use. Simply install it in a convenient location near your
operating position, and provide 12 volts DC through a fused line (fuse not included; LDG
recommends a 2 amp fast-blow fuse). Or, you can install the DTS-4 in the trunk near your mobile
antennas, and use the DTS-4R near the operation position. The DTS-4R also requires a fused
power line.
The DTS-4 is principally intended to switch four antennas to one transceiver. However, you can
also use it "backwards", switching one antenna among 4 rigs as long as the RF power is limited to
200 watts*. In this case, you would attach the single antenna to the center connector, and each of
the rigs to one of the other four connectors. Otherwise, operation will be the same.
You can also connect two DTS-4 units “back to back” to allow multiple transceivers to connect to
multiple antennas. Again, this is fine for RF power levels of 200 watts or less*.
*For higher power, you would need a switch with 70 db or more of isolation.
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