Installation
2-12 9390 Reference manual
Grounding—RF earth
A good ground (RF earth) is essential for efficient operation
of the installed transceiver system.
This section is a general guide for achieving the best
performance from your installation. For maximum reliability
and safety, we recommend that you also seek expert advice
specific to your installation.
Inappropriate earthing can result in severe damage to your
vessel through electrolytic corrosion.
The chassis and earth point of the 9390 transceiver are
connected to the negative supply. The 9390-H receiver-
exciter, control head, PA type 4404, code 733B Aerial DC
Isolator and antenna tuners have isolated earth points.
Ship stations
A metal hulled vessel in salt water provides an almost ideal
ground. Connect the tuner and any other equipment requiring
an earth to the hull using the shortest possible ground strap.
To minimise contact resistance, use a large, clean and paint-
free contact area.
Antenna
9103 or 4203
antenna
tuner
Code
733B (as
required)
9390
transceiver
Control
head
Do not earth the transceiver
Connect earth points directly to
the metal hull
Figure 2.5
General grounding requirements for metal
hulled vessels
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