GPS7 module adjustment procedures
GPS7 module ad
justment procedures
The GPS7 modu
le has multiple adjustments associated with it, both to the module
(Black Burst Amplitude and Black Burst Offset) and to the mainframe master
clock frequency.
Refer to Mainframe adjustment procedures for instructions on how to adjust the
mainframe master clock using the GPS7 module. (See page 2-2, Mainframe clock
adjustment.)
Requirements for adjustment
Before doing the adjustment, note the following requirements.
Personnel
This proc edure is only to be performed by trained service technicians.
Warm-up period
The GPS7 module requires a 20 minute warm-up time in a +20 °C to +30 °C
enviro
nment before it is adjusted. An external antenna or GPS signal must be
connected during the warm-up time. Adjustments done before the operating
temperature has stabilized may cause errors in performance.
Required equipment
The following table lists the equipment required to perform the adjustments
needed for this module.
Table 10-1: Equipment required for the GPS7 module adjustment procedures
Item No. Minimum requirement Recommended equipment
TV signal generator platform
1
Tektronix TG8000
Digital multimeter 1
5 1/2 digits
FLUKE 8842A
75 Ω BNC cable
1 Length: 42 inches Tektronix part number 012-0074-00
75 Ω coaxial precision
terminator
1
75 Ω ±0.1%
Tektronix part number 011-0102-03
BNC T connector
1 Tektronix part number 103-0030-00
BNC female to dual banana
adapter
1 Tektronix part number 103-0090-00
10–2 TG8000 Multiformat Test Signal Generator Service Manual
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