GENERAL GCP5000 (GCE) APPLICATION INFORMATION
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2-9
SIG-00-22-02 JUNE 2022 (Revised September 2022)
Version: B.1
The maximum PSO operating distance with 0.06-ohm shunting sensitivity and with impedance
bonds in the circuit is 65% 0f the operating distance in Table 2-4, Table 2-5, and Table 2-6, for
each frequency based on ballast resistance of 2 ohms per 1000 ft (304.5 m).
2.2
Frequency Usage and Compatibility Guidelines Warning
WARNING
NEVER USE AN APPROACH FREQUENCY THAT IS THE SAME AS
THE ISLAND FREQUENCY.
WARNING
ENSURE THAT OTHER EQUIPMENT CONNECTED TO THE TRACK IS
AREMA COMPLIANT AND COMPATIBLE WITH THE PSO AND ISLAND
FREQUENCIES USED.
WARNING
IF A SWITCH IS PRESENT IN THE PSO APPROACH ADDITIONAL
CIRCUITRY MAY BE REQUIRED TO ENSURE THE SHUNT IS
DETECTED THROUGH ALL OF THE TRACK SECTIONS.
NOTE
Avoid using adjacent channel frequencies on the same track. This is
generally accomplished by separating the frequencies into two groups, as
depicted in Table 2-1, Table 2-2, and Table 2-3. When mixing standard
and alternate frequencies, several frequencies may not be compatible
due to harmonic content.
The PSO Module Standard frequencies depicted in Table 2-1 are available for use with the PSO
Module when utilized as a PSO transmitter or receiver. The Alternate I and Alternate II
frequencies depicted in Table 2-2 and Table 2-3 are those typically used by other equipment
and are available for use with the PSO module. However, the alternate frequencies use
Siemens modulation patterns and are not directly compatible with non-Siemens transmitters or
receivers. When PSO module Receiver-Transmitter pairs are deployed, they can be substituted
for other non-PSO II/III legacy overlay equipment operating on the same channel.
2.2.1 Non-Electrified Track
All PSO operating frequencies (156 through 10200 Hz) are available for use on non-electrified
track.
2.2.2 Electrified Track
The PSO 4000 system may be used in either AC or DC electrified track providing all other
application requirements are met. PSO 4000 operating frequencies 645 through 4000 Hz should
be used on electrified track.