electrics/electronics

mcalan

mcalan

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Tollesbury Essex/ Brittany
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Im looking for someone who can help me with some electical issues for my boat which is at Tollesbury.
The issues are that the fuel gauge and engine hour meter both dont work.
I have also recently installed a Nasa AIS system using a Glomex splitter to a Simrad RD68 VHF set which now is showing" no position."
If any one has any recommendations Id be very grateful
 
would think they are 2 different problems unless you've disturbed the engine instrument connections whilst installing new toys. first thing I'd check is the negative connection to both engine instruments. As far as VHF and AIS are concerned, presumably they are both connected to a seperate GPS for positioning, again they may have a common negative connection - worth checking. Good Luck.

adrian
 
mcalan said:
Im looking for someone who can help me with some electical issues for my boat which is at Tollesbury.
The issues are that the fuel gauge and engine hour meter both dont work.
I have also recently installed a Nasa AIS system using a Glomex splitter to a Simrad RD68 VHF set which now is showing" no position."
If any one has any recommendations Id be very grateful
Click to expand...

Your AIS problem doesn't make any sense, the way you describe it. You do not connect AIS to the VHF.

Need more info here.

What plotter/GPS do you have ?
Which Nasa system (just the "engine" or the system with it's own screen) ?
How do you think you connect the AIS to the VHF ?
 
AIS needs vhf antenna connection and gps connection, assuming the vhf is dsc it probably has an nmea input from a gps that can be tapped into to feed both vhf and ais with position info.
 
leomagill said:
AIS needs vhf antenna connection and gps connection, assuming the vhf is dsc it probably has an nmea input from a gps that can be tapped into to feed both vhf and ais with position info.
Click to expand...

Depends which AIS he has. The NASA one with the screen needs GPS, an AIS engine just needs an antenna and outputs the AIS data to a plotter.
 
leomagill said:
It was the 'no position' message that put me in that direction, I'd have though a plotter would use it's own position data anyway.
Click to expand...

You may well be correct, i suspect you are.

One of the confusing bits in the OP is
to a Simrad RD68 VHF set which now is showing" no position."
Click to expand...

I took that to mean that the VHF no longer shows it's position, suggesting that it once did. But the OP is a bit confusing, i'd like to hear more info.
 
update

Many thanks Ill try and clarify things to assist. The radio Simrad`RD68 is a DSC set and although it has a pair of small red and black wires comung form the back these are not connected to anything. I therfore assume that it was obtaining its position from its VHF antenna?
When i fitted the AIS it needs a VHF antenna so I used the splitter and the radio now says no position hope this helps

Alan
 
Are you sure the two wires from the RD68 are not red and blue? These are the NMEA wires that connect to your gps. If not connected to a gps you will not get a position on the radio. A VHF aerial does not give you a position but does receive the AIS data.

So to sum up without a diagram... Your GPS will give you a NMEA output with your position, which is fed to the RD68 and it is also fed to the Nasa AIS Radar (Im assuming thats the one you have)

Your VHF aerial goes to your Glomex splitter which feeds your RD68 and your Nasa AIS Radar.
 
Oldgeezer said:
Are you sure the two wires from the RD68 are not red and blue? These are the NMEA wires that connect to your gps. If not connected to a gps you will not get a position on the radio. A VHF aerial does not give you a position but does receive the AIS data.

So to sum up without a diagram... Your GPS will give you a NMEA output with your position, which is fed to the RD68 and it is also fed to the Nasa AIS Radar (Im assuming thats the one you have)

Your VHF aerial goes to your Glomex splitter which feeds your RD68 and your Nasa AIS Radar.
Click to expand...

Page 40 of the RD68 manual does indeed state the wires are red and blue. You are of course correct that no position data is displayed without a GPS connection.

Still impossible to give better help until the OP answers the questions in my first post.
 
Another question is did the vhf display a position before trying to fit the ais? I'm sure the answer must be no without a separate gps input but on a dsc set you can manually input a position, although it should be disregarded after 24 hours automatically by the dsc set.
Do you have a separate chart plotter?
 
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