Performance veri
fi
cation
Option GPS performance veri
fi
cation
The following procedures verify the functionality of the Option GPS
Synchronization connectors.
NOTE.
All of the procedures in this section only apply to SPG8000 instruments
with Option GPS installed.
Required equipment
The following table lists the required equipment for the following procedure.
Table 35: Required equipment for Option GPS performance veri
fi
cation
Item
Qty.
Minimum requirements
Recommended equipment
GPS or GLONASS
antenna feed with good
signal level
1
1
Less than 5 dB attenuation since
last ampli
fi
er
If a GPS or GLONASS antenna feed
is not available, use the following
equipment (or equivalent) to create a
GPS signal source.
Trimble Bullet III: 5 V, 35 dB gain,
antenna with F-connector
Cable: up to 200 ft Belden 1694A,
with F connector on one end and a
BNC on the other
NTSC Black sync source
that is locked to GPS or
GLONASS
1
1
NTSC signal with phase within
150 ns of the TAI epoch timing
GPS7 module in a TG8000 or
equivalent
2
6, 10, and 20 dB antenna
pads
variable
If antenna has no
additional amps, one
6 dB and one 10 dB
should be adequate.
For a fully buffered
system, 30 or 40 dB
total is probably
needed.
Use several pads that allow similar
ranges
6 dB, Mini-circuits HAT-6-75
10 dB, Mini-circuits HAT-10-75
20 dB, Mini-circuits HAT-20-75
Waveform monitor
1
Tektronix WFM8300 or WFM7120 with
Option CPS
Voltmeter
1
Fluke
LTC/GPIO breakout
adapter cable
1
Tektronix part number 012-1717-00
600
Ω
LTC load with
meter access
1
Create this item by soldering a 600
Ω
resistor to pins 2 and 3 of a female XLR
SPG8000 Speci
fi
cations and Performance Veri
fi
cation
73
