Specifications

• In the transmit mode, the PPS is used as a postselector. It attenuates spurious signals and
broadband noise in the driver transmit signal before it reaches the internal 500W power
amplifier, thereby reducing interference to neighbouring receivers.
In both modes, the PPS automatically tracks the RM500/RM500R operating frequency. Rapid tuning
makes the PPS suitable for Automatic Link Establishment (ALE) or Adaptive Applications.
During self-test, the PPS automatically switches to the bypass mode: in this mode, RF signals pass
directly through the PPS, without filtering, and therefore does not interfere with system operation.
The PPS also switches to the bypass mode when the RM500/RM500R frequency is outside the PPS
operating range, 1.60 to 29.99 MHz.
In case excessive RF power is applied to the PPS, the PPS enters the RF overload protection mode: in
this mode, the PPS antenna port is disconnected, and the internal antenna input is short-circuited to
ground. This also protects the RM500/RM500R internal transceiver against overload.
The PPS is housed in a 1U high (1.75 in.) case intended for 19 in. rack mounting. Standard operation
is from 115 or 230 VAC, 50/60 Hz, and can also be powered from 12 or 24 VDC DC sources.
PPS Installation Procedure
Note
The following procedure assumes that the basic RM500/RM500R unit has already
been installed, as explained above (page 13).
1. Identify the installation position of the PPS in the rack, and the position of the
RM500/RM500R to which it will be connected.
2. Install the PPS in the prescribed installation position, fastening it by means of four screws to the
rack rails or to the drawer front.
3. Connect a grounding strap from the RM500/RM500R grounding screw to the prescribed
cabinet’s grounding bar.
4. Set the power switches on the RM500/RM500R and PPS front panels to OFF (down position).
5. Connect the PPS AC power cable to the prescribed outlet on the power distribution box of the
cabinet.
6. Refer to Figure 5 and connect cables between RM500/RM500R and the PPS as follows:
RM500/RM500R Connector PPS Connector
TUNER CONTROL SERIAL I/O
ACC-J2 PARALLEL I/O
RX IN ANTENNA
TX IN EXEC OUT
TX OUT PA IN
RX OUT RADIO
This completes the installation of the PPS.
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