"Gene Kearns" wrote in message
.com...
On Mon, 18 Aug 2008 15:16:03 -0400, hk penned the following well
considered thoughts to the readers of rec.boats:

|Short Wave Sportfishing wrote:
| On Mon, 18 Aug 2008 14:53:28 -0400, hk wrote:
|
| Short Wave Sportfishing wrote:
| On Mon, 18 Aug 2008 10:34:34 -0400, DownTime
| wrote:
|
| - Can you put two different transducers, from two different
| manufacturers on the same stern and each will function accordingly?
I
| guess I am wondering of Garmin's transducer and branx X's(assuming I
go
| that route) might interfere with each other.
| Well, no - not on a small boat. The two signals will interfere with
| each other. Even at twenty feet or so, they will interfere - I have
a
| transducer mounted on my trolling motor which is 21 feet away from
the
| stern and they still interfere with each other.
|
| Has to do with the angle of the beam.
|
| With respect to shallow water performance, that's natural. Get
within
| five feet of the bottom and the signal return will be overpowering
and
| produce nothing but hash. Plus, if the bottom is muddy, you can get
| false returns to hard bottom. I've turned down the sensitivity on my
| Raymarine DS600 to zero and still can't get a reliable reading under
5
| feet.
|
| Shallow water fishing is mostly sight fishing anyway. Even in deeper
| water, depending on the species, it's mostly sight fishing.
|
| The best way to handle this situation is to set the offset for your
| draft - at least that will tell you what you are getting into shallow
| waters.
|
| On my previous Parker, I had a Furuno fishfinder in the cabin and a
| Lowrance fishfinder mounted in the cockpit. They were wired to
different
| transducers on opposite sides of the transom. The transducers were
| different frequencies. Both units worked just fine, even when both
were
| operating at the same time.
|
| Thus, the answer to the question of two transducers is - maybe.
|
| Um...what frequencies?
|
|
|I don't remember. They were installed in 2003, and I sold that boat off
|last year, but before installing them, I spoke with someone at Lowrance,
|and he said the two frequencies would not interfere with each other.

SWAG would be.... 50/200 kHz

--
Agent 5.00 Build 1159
Grady-White Gulfstream, out of Oak Island, NC.

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Probably a bad SWAG. There were some 120khz units out there, and could be
used in conjunction with a 200 khz.