33
MAN-147-0018-A
5.18.
A
NTENNA
(C
ELLULAR COMMUNICATIONS
)
An antenna should be selected to suit the available space in the chamber, allowing
some space for it to be re-positioned (if required). Only use HWM-provided antenna
with your logger, to ensure the radio interface meets approvals requirements (safety,
etc). The Multilog 2
logger uses a metal “FME” style antenna connector.
Prior to connecting the antenna, ensure that
the connector is dry and clear of dirt and debris;
trapped moisture or contaminants can impair
the antenna performance. Clean if necessary.
Apply SG M494 silicon grease to the connector
as required.
The antenna connector has an O-ring included for
protection against water and moisture ingress; it
acts as a seal. Check that the O-ring is present and
undamaged.
Ensure that the connector and O-ring are dry and
clear of dirt and debris. Clean carefully if necessary.
Insert the antenna connector into the logger
connection and ensure it is fully home. Tighten the
connector correctly; the nut on the antenna should be finger tight, plus 1/4 turn.
No sharp bends should exist at the
cable ends, or in the routing of the
antenna cable.
To avoid risk of crush damage to the
antenna cable, check that no
equipment is placed onto it. Similarly,
cable ties fixing the cable in place
should not be too tight.
The antenna should not be bent to fit the
installation; if it is too big for the chamber,
use a smaller type of HWM approved antenna.
When positioning the antenna, ensure that the
radiating end of the antenna does not touch
or go close to a metal surface.
The radiating element of the antenna should
ideally be positioned in free air (free from
obstructions).
Nut
O-ring
Apply a small
quantity of
WRAS approved
silicon grease
(type
SG M494
) to
the
inside
of the
logger connector
during installation.
Figure 21. Antenna connector detail
No
sharp
bends
OK
Figure 22. Protect from sharp bends (especially near connectors)
Keep away
from metal
surfaces
OK near
metal
Figure 23. Antenna and metal surfaces
