hopf 6021GPS, Техническое руководство

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F
AULT
A
NALYSIS
/ T
ROUBLESHOOTING
6021GPS GPS Satellite Clock - V01.00 35 / 41
hopf
Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: info@hopf.com
Case 1:
Effect: No satellite appears on the display after first installation and 00 is displayed
under V .
Possible faults:
•
The antenna cable is too long
•
An incorrect type of cable was used for the antenna cable length
•
The antenna cable is faulty
•
The antenna cable is not connected
•
The antenna is faulty
•
The lightning protector is faulty
Case 2:
Effect: There are 7 satellites within the range of visibility ( V=07 ) but only a
maximum of 2 are displayed. However, the values of these satellites are 50
or higher.
Possible fault:
•
The visibility range of the antenna to the sky is restricted and the Board is
set to 3D reception mode.
Case 3:
Effect: 9 satellites in the range of visibility ( V=09 ), 6 satellites appear on the display.
The signal to noise ratios are all less than 30. The equipment does not
synchronize.
Possible faults:
•
The cable is too long
•
An incorrect type of cable was used for the length of the antenna
equipment
•
The BNC sockets are not mounted correctly
•
The cable is kinked or broken
•
Indirect lightning protection has been irreversibly damaged due to excess
voltage
•
Faulty antenna
Case 4:
Effect: The equipment was working well previously but there has been no reception
for several days. There are 7 satellites in the range of visibility (
V=7 ).
However, no satellite is displayed.
Possible faults:
•
The cable is damaged.
•
There was excess voltage on the antenna equipment and the lightning
protection is damaged.
•
The antenna is faulty.
•
The receiver on the Board 6021GPS is faulty.
•
A constructional change has had an effect on the antenna equipment (e.g.
shading of the antenna due to subsequent building work or the subsequent
laying of cables with high alternating fields in the close vicinity of the
antenna cable)
•
Electronic devices with an interference effect on the GPS signal have been
put into operation in the vicinity of the GPS antenna equipment or receiver
(e.g. pager transmitter)
Further information on the subject of the GPS antenna equipment can be found in the
document titled “GPS Antenna Equipment“.