GENERAL GCP5000 (GCE) APPLICATION INFORMATION
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2-7
SIG-00-22-02 JUNE 2022 (Revised September 2022)
Version: B.1
NOTE
In some cases, AFTAC II unit compatibility with Model 3000/4000 GCP
frequencies can be affected by Island Frequency, when that frequency is
too close to the selected AFTAC II frequency. Changing the Island
Frequency can sometimes enable the use of a given AFTAC II unit
frequency.
2.1.2.3 Union Switch and Signal AFO Unit
Table 2-6 depicts the frequency compatibility of the PSO Module Alternate II (US&S AFO)
frequencies with the frequencies used by Model 3000 or Model 4000 families of Grade Crossing
Predictors.
Table 2-6 PSO Module Alternate II (US&S AFO) Frequency
and 3000/4000 Family GCP Frequency Compatibility
Model 3000/4000 GCP
Frequencies (Hz)
8
6
1
1
4
1
5
6
2
1
1
2
8
5
3
4
8
4
3
0
5
2
5
6
4
5
7
9
0
9
7
0
PSO Module
Alternate II
(US&S AFO)
Frequencies
Group 1
Frequencies
1000
1250
1500
1750
2300
2800
Group 2
Frequencies
1125
1375
1640
1875
2175
2675
Compatible
INCOMPATIBLE
NOTE
In some cases, AFTAC II unit compatibility with Model 3000/4000 GCP
frequencies can be affected by Island Frequency, when that frequency is
too close to the selected AFO unit frequency. Changing the Island
Frequency can sometimes enable the use of a given AFO unit frequency.