Re: Re: Re: depth finder interference with Fish Hawk
Bob YOAdrien is right on the $$ about the freq.issues also make sure that your wires from the fish hawk are all by them self to the battery don't use a common conection and keep the wires away from you fish finder wires If you still have problems you could get a RF choke it's a pc of ferrite that the wires go thru and could help filter out the freq that is giving you problems I can't remember who it was but they posted something about these chokes in a past post.Good luck.
Re: Re: Re: Re: Re: Re: depth finder interference with Fish Hawk
I don't know how much the chokes will help on this one?
I believe the problem is happening in the water because there are 2 transducers sending signals in close proximity at similar frequencys they are picking up each others signal in the water.
Re: Re: Re: Re: Re: Re: depth finder interference with Fish Hawk
The toriod choke will give you much more attenuation than the ferrite. The ferrite choke is used more for control and data cables and also can be used for power lines. The choke is more effective when installed close to the offending source of the interference.
Re: Re: Re: Re: Re: Re: depth finder interference with Fish Hawk
Here is a thread concerning the Fishhawk 840 problemsFishhawk 840.
The toroids are available at Radio Shack, click on “Choke”. Put the choke as close to the unit as practical.
Re: Re: Re: Re: Re: Re: Re: Re: depth finder interference with Fish Hawk
Do you have the 2 transducers seperated as much as possible?
You can also angle the fishhawk transducer a bit out to the side and run your probe on the outside rigger closest to the fishhawk transducer. That will help by seperating the underwater signals.
That screw on the back of the fishhawk i was talking about will make it's sending beam wider or narrower. This could help cut down on interferance there.
As far as wiring goes my fishfinder unit and my fishhawk display are 1 inch apart and the power wires go down the same hole. No problem there, maybe i'm just lucky?
Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: depth finder interference with Fish Hawk
no, not right out of the box.
You have to calibrate them to read the same for a place to start.
get in a calm day in a lake with no currents like winni put on your gps and get the boat set to 2 mph then adjust the down speed screw on the back of the fishawk to read 2 mph and then you will be calibrated to measure for underwater current in places like ontario or whaever.
don't bother with surface speed on the fishawk it is affected by things like waves and moter thrust. paddlewheel surface speed is pretty useless. works ok on some boats.