Symmetricom ATS-6501 Tflex User Manual page 64

[position]
[alt] 1.8410799999999998e+01
[fixed] true
[lat] 3.8466365580420003e+01
[lon] -7.7440877483110000e+01
[mode]
[enum] 0
[satellite]
[number] 0
[signal]
[avg] 0.0000000000000000e+00
[desc] Poor
[enum] 0
[freq] single
[max] 0.0000000000000000e+00
[min] 0.0000000000000000e+00
Note: If the system is reporting it is not tracking yet it shows it is tracking 4 or more
satellites the manually entered position may be incorrect. Verify the position settings and correct
any errors. If the position is not known or the error will not clear change the position_mode to
auto and resurvey the antenna position. This should clear the GPS Tracking Error. Users can
obtain the position information after the auto_hours (position_period) has expired by processing
the RINEX file.
Possible causes are:

Poor antenna location (See 6.3.1)

Mask Angle set improperly (See 6.3.1)

Antenna Cable Failure
o Failed lightning protection device. If a lightning protection device has been
installed in the RF & DC path ensure the device has not failed and is not open (no
continuity).
o Bad Cable. The cable may have failed due to exposure to the weather, kinking,
or bending. Inspect the antenna cable and correct any issues and replace any
cables that appear to be weathered.
o Improper Antenna Cable. The cable may be either too long or the improper type.
Symmetricom recommends using low loss coaxial cables for the GPS antenna
cable. Cable losses cannot exceed 10dB when using the antenna supplied with
the ATS-6501.

Antenna Failure
o Loss of Power. Antenna requires 5-18Vdc to operate properly. Disconnect the
cable from the antenna and measure the DC voltage between the center pin (+)
and shield (-) to ensure the antenna operating voltage is present. If not, check the
cable continuity and DC Power Source.
Note: The DC Power source may be a BIAS Tee or the ATS-6501. Ensure the
antenna voltage is available from the proper source.
o Failed Antenna. If the DC Power source is available and at the proper level and
the antenna cable continuity is good, replace the antenna.

User entered an invalid position
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DOC06501_Revision F
ATS-6501 Users Guide