Airmar P 79 in hull transducer not reading depth - SailNet Community

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  #1  
Old 09-23-2013
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Airmar P 79 in hull transducer not reading depth

Hi,
We have installed a Airmar P 79 in hull transducer. It is in the bilge of our 1978 Islander Freeport sail boat.
The Airmar P 79 transducer is connected to our Garmin network and as soon as we connected it we saw the Depth on the Garmin 740 chart plotter, but with no numbers. There was not any depth readout before so we are thinking it is working on the network fine.
We followed the direction in how much fluid to add 2.4 fluid ounces and we used 99 percent Antifreeze.
We do not get and numbers for the depth. it reads like this __ __.
Any one got an idea why we are not getting a reading?
We are at our slip in about 13í of water. We have not gone out to test this is deeper water.
Currently in Paradise Village Marina in Puerto Vallarta Mexico.
Thanks,
Chip
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Old 09-24-2013
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Re: Airmar P 79 in hull transducer not reading depth

Is the bilge above a lead keel? If so, perhaps the keel is not allowing a good reading of the ground.
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Old 09-24-2013
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Re: Airmar P 79 in hull transducer not reading depth

Did you do the recommended test - before installing lower the unit into the water and make sure it was working?

I'm going to assume you are running the depth in through a NMEA 0183 connection - or are you straight NMEA 2000.

I have a P79 hooked to my Raymaring e7d, excellent low cost choice for a transducer. I get depth and good fishfinder data.
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Old 09-26-2013
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Re: Airmar P 79 in hull transducer not reading depth

Quote:
Originally Posted by ambianceack View Post
Is the bilge above a lead keel? If so, perhaps the keel is not allowing a good reading of the ground.
Yes the bilge is above a lead keel. Well it is not above the bilge where the transducer is over to the side but I get you point. The lead may be stopping the reading?
Thanks,
Chip
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Old 09-26-2013
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Re: Airmar P 79 in hull transducer not reading depth

Hi,
No we forgot about the recommended test! We can still do that but of course we need to un-snake the cable all the way along the boat to do it This may well be what we will have to do.

Our network is a NEMA 2000 Garmin network. The extra cable we attached to the transducer cable is a backbone cable 5 pin.
Thanks,
Chip
Chip
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Old 09-26-2013
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Re: Airmar P 79 in hull transducer not reading depth

Two possible points. It only shoots through a limited thickness of fibreglass, 1" from memory but check their site. No wood. I also think that the cable is fixed in length. That is the signal processing relies on a fixed known length.
I don't know the details of using a network. Just straight into a fishfinder plotter you also enter the type of transducer. You can also test it over the side before fixing it in position. I take it you have it offset to the side so the beam doesn't hit the keel (though it might if you are heeled).
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Old 09-27-2013
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Re: Airmar P 79 in hull transducer not reading depth

Hi,
We will email Airmar and see about cable length.
I am not sure how thick our hull is at the point it is installed but I doubt it is over an inch.
Thanks,
Chip
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Old 09-27-2013
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Re: Airmar P 79 in hull transducer not reading depth

P79 is good up to 5/8" solid fiberglass
Airmar FAQ - I want to install an in-hull transducer. What is the maximum hull thickness that I can shoot through?
put it in a bucket of water it should read the bottom of the bucket. if you can hang it off the side of the boat just in the water it will read mooring depth.
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Old 09-27-2013
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Re: Airmar P 79 in hull transducer not reading depth

Here is what I got

FYI
From the Airmar FAQ

What affect does hull thickness have on the performance of an in-hull transducer?

The thicker the fiberglass the more signal is lost passing through the hull. However, our in-hull transducers are designed to more than compensate for this loss.
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Old 09-28-2013
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Re: Airmar P 79 in hull transducer not reading depth

the thickness does have an effect on both the max depth and the resolution. if you want to use it for serious fishing then you will want a thur the hull sensor. if only for depth to keep your keel in good shape then the hull thickness will not be a problem for the in hull sensors.
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