Instruction Manual
628 GNSS RTK Expansion Pack 9
4. Slide the top of the hand strap up to detach it from
the back. Remove the boom of the hand strap. (The
hand strap is not used with the pack. Place the hand
strap someplace where you can nd it in the future.)
5. Place the RTK GPS Expansion Pack on the back of the
handheld and insert the four screws included with it.
6. Tighten the screws to aach the pack.
Attaching the Antennas to the Expansion Pack
Follow these instructions to aach the antennas to the
RTK GPS Expansion Pack:
1. Aach the GSM modem antenna (North American or
international, see page 3) to the RTK GPS expansion
pack. The GSM modem antenna connector is the
smaller of the two coaxial connectors (SMA) on the
top of the pack. Use the knurled ring at the boom of
the antenna to tighten the antenna. Do not twist on
the antenna rod to tighten the antenna. Do not over-
tighten it—it should only be nger tight.
IMPORTANT: The RTK GPS Expansion Pack should
not be operated without having the cell modem
antenna connected.
2. Aach the GPS antenna cable to the GPS antenna
connector. The GPS antenna connector (TNC) is the
larger coaxial connector on the top of the pack.