Signal Frequency

Carrier center frequency

Carrier Type	Center Frequency (Hz)
1700Hz(F1)	1701.4
1700Hz(F2)	1698.7
2000Hz(F1)	2001.4
2000Hz(F2)	1998.7
2300Hz(F1)	2301.4
2300Hz(F2)	2298.7
2600Hz(F1)	2601.4
2600Hz(F2)	2598.7

Low frequency modulation: 18 types - 10.3Hz, 11.4Hz, 12.5Hz, 13.6Hz, 14.7Hz, 15.8Hz, 16.9Hz, 18.0Hz, 19.1Hz, 20.2Hz, 21.3Hz, 22.4Hz, 23.5Hz, 24.6Hz, 25.7Hz, 26.8Hz, 27.9Hz, 29.0Hz.

Carrier frequency deviation: Δf = ± 11Hz.

Receiving Parameters

Pick-up threshold value: 193mV~217mV

Drop-away threshold value: ≥170mV

Pick-up time: 2.6m~3.5m

Drop-away time: 2.0m~2.5m

Check pick-up value: 440mV~460mV

Check drop-away value: 80%~85% of the adjustment value

Transmission output

Maximum output of the section amplifier is 70W (load resistance is 400Ω), set to 5 levels.

Power consumption

With DC48.0V±1.0V, maximum power consumption of each signal point between sections is 200VA. Maximum of each transmission device inside station and that of the intelligent communication unit are both 250W. 99W for each radiator between sections. 132W for each radiator inside station.

Receiving current of cab signal

Even the track circuit is under the worst condition, with 0.15Ω shunting resistance, when the carrier frequency is 1700Hz, 2000Hz or 2300Hz, the minimum entrance cat signal can reach 500mA. When 2600Hz, 450mA.

Voltage of track circuit required

When the ballast resistance is at the lowest level, the working voltage of the main track receiving should not be less than 240mV. When the ballast resistance is infinite high, and the shunting resistance in the main track is 0.15Ω, the voltage should not be more than 140mV. The voltage for the tuning area should be between 750mV and 850mV. When the shunting resistance of the transmisson tuning unit in the tuning area is 0.15Ω, the voltage for the tuning area should not be more than 170mV.

Transmission length of track circuit

Ballast resistance(Ω·km)	Cable length (km)	Track circuit length (m)
		1700Hz	2000Hz	2300Hz	2600Hz
0.6	10	750	700	725	725
	12	550	575	525	575
	13.5	550	575	525	575
	15	550	575	525	575
0.8	10	1000	975	950	850
	12	850	850	775	900
	13.5	850	850	775	900
	15	850	850	775	900
1	10	1400	1400	1400	1400
	12	1300	1300	1300	1300
	13.5	1200	1200	1200	1200
	15	1200	1200	1200	1200