16
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.
