Spectra Precision SP80 - Manual (Page 53)

Engl
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47
Installing the UHF
Module into the
Receiver
• Power off the SP80 and turn it upside down.
• Use the L-shaped Torx screwdriver provided in the SP80
UHF kit to loosen and remove the four screws ([1])
securing the 5/8” threaded insert plate.
• Insert a finger into the 5/8” threaded hole ([2]), then
gently pull the plate out of the receiver, making sure you
free the ribbon cable anchored to the plate without
damaging it ([3]).
• Put away the 5/8” threaded insert plate in a safe place,
possibly for subsequent use.
• Take a look at the instructions printed on the label located
in the bottom of the recess.
• Connect the end of the ribbon cable (a 12-contact flat
connector) to the UHF module ([4]) as instructed on the
label (point 1).
• Insert the UHF module into the recess ([5]) as instructed
on the label (point 2).
• Re-use the four screws and Torx screwdriver to secure the
UHF module onto the receiver. Tighten the screws to
preserve receiver watertightness (torque meter: 3 N.m).
NOTE: The insertion of the UHF module slightly modifies the
ARP (Antenna Reference Point) of the GNSS antenna, thus
reducing the antenna phase center offset by 2mm (see
diagram below).
Be aware that the receiver will automatically apply this delta
following the installation of the UHF module by assigning a
different antenna name to the SP80. In fact, two distinct
antenna names exist for the SP80. One describes the
antenna parameters when no UHF module is used (antenna
name with “-1” suffix), and the other when the UHF module
is used (“-2” suffix).
When post-processing SP80 raw data files (G-files), SPSO
(Spectra Precision Survey Office software) will automatically
recognize the presence or not of the UHF module while you
collected your raw data by analyzing the antenna name
mentioned in the G-files.
[3]
[1]
[2]
[4]
[5]
L1 82.6 mm
L2 75.6 mm