96 Technical Specifications and Operating Parameters
A.2.5 Position Accuracy (rms)
• 25 meters, SA (USA Department of Defense Selective Availability) OFF, 100 meters, SA ON.
• Elevation, 140 meters, SA on
A.2.6 Satellite Tracking
• 12 channels, C/A code (1575.42 MHz)
The receiver simultaneously tracks up to twelve satellites. Results from all tracked satellites are
averaged in Position-Hold Mode or, with Position-Hold Off, are determined by least-squares esti-
mation.
A.2.7 Acquisition
• 150 seconds typical, cold start
• 15 minutes, 90% confidence, cold start
• 40 seconds typical, with almanac < 1 month old
A.3 I/O Configuration
Output signals, or the designated input, may be selected on specified connector by means of internal
push-on jumpers and special wiring. Each output connector is independently buffered.
A.3.1 I/O Connectors
I/O connectors may be configured to any one of the output signals or a specific input function as
listed below:
• Signals, three BNC, with output signals as described below.
• Relays, two sets, 5-mm plug-type terminal block
A.3.2 Standard Output Signals
• IRIG-B: Modulated (1 kHz carrier). Analog outputs are complementary emitter follower
(2N4401/4403) with 20-Ohm protective resistors, driven by a (LF442) op-amp. Modulated,
bus driver, 4 Vpp, 20-Ohm source impedance, and drives a 50-Ohm load at 3 Vpp – one BNC
connector
• User configurable: IRIG-B Unmodulated, or Programmable Pulse – one BNC connector
• User configurable: 1 PPS (10-ms pulse-width), IRIG-B Unmodulated (not available on earlier
units) or IRIG-B Modified Manchester (IEEE Std 1344) – one BNC connector
User configurable outputs are 5-V CMOS bus drivers with 10-Ohm source impedance and ±75-mA
drive capability.
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