DX Engineering DXE-RTR-2 - Bias Tee Always on

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The RTR-2 failsafe requires the installation of a keying cable. It is disabled with the Force Ground
internal jumper. Force Ground is provided for RTR-2 applications when ONLY receive antennas are
used, such as SWL or AM DX operations. MAIN ANT IN may also be used for a receive antenna, if
RADIO connection to a transceiver RF output is NEVER to be made.
The Force Ground internal jumper disables the failsafe provided by requirement of the keying cable
connection to RADIO PTT-RX ENABLE. See the Internal Jumpers section.
WARNING: When the Force Ground jumper is used to disable RTR-2 failsafe, and when unit is in
RX ANT mode, any RF transmitted into the RADIO connector will cause internal
damage, especially to optional Plug-In Modules, and may damage externally connected
receive equipment.
Damage caused by misuse of the “Force Ground” jumper is not covered under warranty.
Bias Tee Always On
The PCB mounted on the RTR-2 front panel has one jumper labeled “Bias Tee Always On” as
shown below. The factory default for this jumper is open - pins NOT connected together).
When this jumper is connected (both pins shorted together), bias tee voltage is present regardless of
transmit and receive keying. This jumper should only be installed for non-RTR, receive only use of
the RTR-2. Keyed bias tee voltage on the receive feedlines is normally desired.