AFTAC II Train Detection

AFTAC II Train Detection

A New Generation of Audio Overlay Detection

The Audio Frequency Train Activated Circuit (AFTAC) II system is GE’s latest FM audio overlay technology for train detection.

The AFTAC II model is especially effective for locations with a heavily saturated channel spectrum. It may be applied with systems that control crossing warning devices at highway/railroad grade crossings and in train control systems where overlay train detection is needed.

Particularly useful when the channel spectrum is heavily saturated

• Fully compatible with original FM AFTAC equipment
• Configurable four different ways using the same enclosure
• Reduced module requirements: two for receiver; one for a single transmitter
• Flexibly controlled power output

• Increased noise immunity
• Improved selectivity between channels
• Versatile, compact system design

• Above 800 Hz: 3 db points 3% (fc) min, 30 db points 10% (fc) max

• Below 800 Hz: 3 db points 6% (fc) min, 30 db points 25% (fc) max