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Running Two Transducers - Interference

Old 07-12-2005, 05:15 PM
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Default Running Two Transducers - Interference

When I purchased my Parker 21SE two years ago my dealer installed a Gramin 188c (his recommendation). I soon discovered that this unit has trouble reading shallow depths. I subsequently installed a second low power bottom machine which reads shallow water well. Trouble is that when I run the low power unit I cannot use my GPS as the 188c transducer powers up at the same time. Two transducers running side by side at the same time creates interference. Is there any simple way to disconnect the 188c transducer when I want to use the lower power bottom machine and run the GPS at the same time?
Old 07-12-2005, 05:20 PM
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Default Re: Running Two Transducers - Interference

you can switch the transducer frequency to 50khz on your 188c and then it won't interfere with your shallow depth unit which runs at 200khz.
Old 07-12-2005, 07:36 PM
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Default RE: Running Two Transducers - Interference

You can also go into your menu and turn the sonar "off" on the 188C. At least I can on my 188. It should be the same tab that allows you to run the simulator.
Old 07-12-2005, 07:58 PM
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Default Re: Running Two Transducers - Interference

what they sed. as a 188c owner, i'm curious to know what you consider "shallow" depth. i read down to a foot and change. where are your two transducers mounted?

in fact, the ONLY redeeming depth/FF feature of the 188c is its ability to read shallow -- much shallower than any ray or furuno i've seen (emphasis on the ones I personally have seen).
Old 07-12-2005, 08:44 PM
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Default Re: Running Two Transducers - Interference

landlubber

Garmin Tech Support tells me that the 188c with 500 watts of power will have trouble reading depths under 10 feet. My boat is in Englewood FL and reading down to 2 feet is a must. Right now I have a liquid filled shoot thru transducer which is not doing the trick. Garmin recommends replacing it with a single frequency transom mount transducer. I also have a Lowrance X47 that I installed for shallow water. This transducer is a transom mount. I assume that the transom mount transducer for the 188c will be next to this one. Hence my concern about interference. Perhaps after installing the transom mount transducer my 188c will read shallower depths. I'll have to wait until I get there in October to find out. What type of transducer do you have?
Old 07-12-2005, 09:05 PM
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Default Re: Running Two Transducers - Interference

strange as it actually sounds, a single frequency transducer will read shallower depths as Garmin Suggested due to fundamental transducer design parameters. If you don't need 50khz, then that should solve your problem. You could also install that single frequency transducer shooting thru your hull.
Old 07-12-2005, 09:07 PM
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Default Re: Running Two Transducers - Interference

i certainly hear ya about the shallow water ability. i can go weeks w/o venturing into water deeper than 10'.

i have a transom mount dual frequency tranducer w/ temp, that came as a package w/ the 188c. i have a 185 scout CC. i have a feeling all will be well when you move it to the transom, then you'll probably start wondering whether you shud yank out the lawrance -- which i have NO IDEA whether is a good sounder/FF (it can't be worse than the 188c, which is otherwise KICK ASS for GPS).


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