NAV4

Where should I site my ANT4a for the best possible reception?

Correct installation of the antenna is very important, the ANT4a must be mounted 'in the clear' and well away from metal objects or rigging wires and away from other antennas by at least 50cm. Any compromise in the positioning of the antenna could result in reduced reception performance. There is normally very little advantage in placing a NAVTEX antenna at mast head, however raising the antenna up to about 6m above sea level can sometimes improve reception if problems are experienced. This could certainly be the case if the vessel suffers from high levels of electrical noise.

My vessel suffers from the effects of high levels of noise...

A direct receive ground connection to the NAV4 can help if the vessel suffers from the effects of high levels of electrical noise. To do this, a ground wire should be run from the antenna screen connection (2) of the NAV4 to a seawater grounding point nearby. A keel bolt or metal skin fitting could provide a suitable ground point. Care should be taken not to compromise the vessels galvanic protection systems. If this could be a problem a .1uf capacitor should be inserted in the ground cable. This will isolate the ground cable from any DC current flow.

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