Humminbird Side Imaging Forums
General => General Discussion => Topic started by: Gattlin on April 06, 2012, 03:13:14 PM
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In rigging the front bow with a n 858c combo. I've mounted the gps puck and I was wondering can I open that little hole on the side and bottom edge of the gps puck a little and just run the tm transducer cable down thru the same hole the cables will run together for about a foot this way but I won't have to drill another hole in the bow with this configuration. And will it cause any interference? Thanks for any relies ;D :o After all necessity is the Mother of all invention. :-\ And when will I learn? Say Hmm
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You should not get any cross talk or interference between gps and sonar..
Chuck
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If it is the hole on the bottom side of the GPS Receiver housing that I am thinking of than there is no problem with doing this – but a picture of what you are asking about would be best way to know for sure.
Nope, will not cause interference.
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If you are talking about the little slot nhole on the puck it is there for the gps wire in case you cant drill the center hole in the mounting area.
there is a waterproofing ring that goes in the circle on the puck. I dont know if I would enlarge the slot on the puck and put both cables there..
You might make another slot just for the 2nd cable but be sure it does not go into the gps puck cup.
Chuck
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I didn't run them together. Gps seems to work great with a 12" elevated post. Satellites picked up the antenna in the garage. Although the quad transducer seemed to have errant lines through it. But on the water testing is needed. I wonder though,, Is continuity of ground an inherit clause. If a ground is not used with the positive in it's circuit,, will interference occur? Thanks again for your help :)
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Grounding is just as important as the positive..
electrical connections and isolation of circuitry will help to reduce interference (rf and voltage noise)..
On one of our portable units we have the gps puck on a 12 inch pvc pipe. Works well
chuck
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Gattlin,
In any electrical circuit there has to be a return wire which may or may not be at a zero volt potential (to earth ground that is). Part of the cause of interference is that there is not a common ground used by all equipment on a boat.
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So by installing a separate battery in the bow and running the 858 on an isolated circuit would make that circuit more conducive to interference. ? If I connect the ground from that circuit to the boats harness and not connect the positive, would that help alleviate issues? Of course I haven't been able to get out on the water yet to test so this might be a little preliminary ATM thanks :)
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Isolating a circuit by providing a separate power source will in most cases reduce interference issues.
I dont know if I would tie power grounds together as it is the third wire "earth" or chassis ground that helps aleivate interference..
Of course on boats a lot of the material is not conductive so an "earth" ground is not possible.
Other than upping costs I dont know if a three wire system if reasonable for boats..
I wonder if anyone has done this?
Chuck
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If you connect the 858 to it's own battery, with nothing else hooked to it, this is the
very best scenario to prevent interference. The current will be flowing in a loop
that is generated and affected by, and only by the 858.
Interference happens when two or more electrical devices are sharing the
same circuit, or are sharing the same frequency and are too close in proximity to
each other.
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Thanks guys for your input I'' just leave it as is for now. I did also rewire the console unit straight to the cranking battery with 12g ground and 14g hot and twisted. The console unit hasn't rebooted sense but time will tell. If the wind would just let up I'd go out ;D
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So by installing a separate battery in the bow and running the 858 on an isolated circuit would make that circuit more conducive to interference. ? If I connect the ground from that circuit to the boats harness and not connect the positive, would that help alleviate issues? Of course I haven't been able to get out on the water yet to test so this might be a little preliminary ATM thanks :)
That really depends on how the interference is being transferred. If it is through the electrical system than having a separate isolated power system is the best option. Most trolling motor interference though is transferred through radio waves in the air and having a common ground can help alleviate this – but not in all cases.
I would wait to see if I had a problem to begin with. If you do you can try a common ground to see if that helps or not. If not, there are other methods to try as well. There is no one size fits all cure for trolling motor RF interference though.