[time-nuts] VP Oncore Frequency

[stork3264 at comcast.net]

2-17-07

VP Oncore Engineering notes under product specification Characteristics of 
receiver architecture has a listing of 

L1 - 1572.42 Mhz.  

Is anyone knowledgable as to the take off point of this frequency on the PCB?

Thanks,

Stork



1. Product Specifications
VP ONCORE GPS Receiver Technical Characteristics
Receiver Architecture • 6 (or 8) channel
• L1 – 1575.42 MHz
• C/A code (1.023 MHz chip rate)
• Code plus carrier tracking (carrier aided tracking)
Tracking Capability • 6 (or 8) simultaneous satellite vehicles
Dynamics • Velocity: 1000 knots (515 m/s)
>1000 knots at altitudes < 60,000 ft
• Acceleration: 4g
• Jerk: 5 m/s3
• Vibration: 7.7G per MIL-STD 810E
Acquisition Time (Time to
First Fix (TTFF)
• 20 sec. typical TTFF (with current almanac, position, time,
and ephemeris)
• 45 sec. typical TTFF (with current almanac, position, and
time)
• 2.5 sec. typical reacquire
Positioning Accuracy • Less than 25 meters, SEP (without SA)
• Less than 100 meters, SEP (with SA)
• DGPS accuracy: 1-5 meters typical
Timing Accuracy (1 Pulse
Per Second, 1PPS)
• 130 ns observed (1&#963;) with SA on
• In Position-Hold mode, <50 ns observed (1&#963;) with SA on
Antenna • Active micro-strip patch antenna module
• Powered by receiver module (25 mA @ 5V)
• Passive antenna configuration (see optional features)
Datums • 49 std datums, 2 user defined, default WGS-84
Output Messages • Latitude, longitude, height, velocity, heading, time,
satellite tracking status (Motorola Binary protocol)
• NMEA-0183 v2.00 (selected formats) available
• Software selectable output rate (continuous or poll)
• Broad list of command/control messages
• TTL interface
Power Requirements • 5 +/- 0.25 Vdc; 50 mV p-p ripple max
“Keep Alive” BATT Power • External 2.5 V to 5.25 V; 15 &#956;A typ, 60 &#956;A max
• 3V onboard battery; 15 &#956;A typ., 60 &#956;A max.
Power Consumption • 1.1 W @ 5 Vdc
Dimensions • Receiver: 2.00 x 3.25 x 0.64 in. (51 x 83 x 16 mm)
• Active antenna: 4.01d x 0.89 in. high (102 x 22.6 mm)
Weight • Receiver: 1.8 oz (51 g)
• Active antenna module: 4.8 oz (136 g)
Connectors • Data/Power: 10 pin (2x5) unshrouded header on 0,1"
centers
• RF: Right Angle OSX (subminiature snap-on)
Antenna to Receiver
Interconnection
• Single coaxial cable (6 dB max loss at L1; 1574.42 MHz)
Operating Temperature • Receiver module -30°C to + 85°C
Humidity • 95% non-condensing, +30°C to + 60°C
Altitude • 60,000 ft (18 km)
• > 60,000 ft (18 km) for velocities < 1000 knots
Optional Features • 1PPS Timing Output
• Raw measurement data
• Onboard rechargeable lithium battery
• Onboard LNA option for use with passive antenna
DGPS • Differential GPS – standard software feature
• RTCM-104 format (remote input)
• Motorola Custom Format