CHAPTER ONE
D. PULSE/1PPS INPUT (BNC J6)
This input pulse may be used for External Start or Tracking. Table 1-3 shows the
characteristics for the Pulse Input at J6 if used.
Table 1-3
Pulse/1PPS Input (J6)
Format 1PPS TTL Pulse.
Pulse Width 1-999,999 microseconds.
Rise & Fall Times Less than 1 microsecond.
E. CODE INPUT (BNC J8)
Table 1-4 lists the Code Input formats and Specifications for each, which are
accepted by this unit.
Table 1-4
Carrier Code Inputs (J8)
Formats IRIG A, B, E, G, H. NASA 28, 36.
XR3, 2137, 1892, AN/GSQ-53.
Carrier Frequencies IRIG A - 10kHz.
IRIG B - 1kHz.
IRIG E - 1kHz or 100Hz.
IRIG G – 100kHz.
IRIG H - 1kHz or 100Hz.
NASA 28 100Hz.
NASA 36 1Khz.
XR3 250Hz.
2137 1kHz.
1892 1kHz.
AN/GSQ-53 250Hz (Use XR3).
AN/GSQ-53 1kHz (Use 2137).
Modulation Ratio 2:1 to 6:1.
Input Signal Level 0.1 volts to 10.0 volts peak-to-peak.
Input Impedance
Greater than 50kΩ, single-ended.
Frequency Range 30Hz to 2MHz.
1-6 TM7000 TymMachine TCG/T (Rev D) Symmetricom, Inc.
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