Depth transducer location?

C-Hawk · Posted: Fri Jul 25, 2008 6:20 pm Post subject:

Is this only in the TC 255? Is there a solid area on the CD22?
First I've heard about this. I have considered going to a through hull. In the past, I've lost signal over 8 knots of speed.

Doryman · Posted: Fri Jul 25, 2008 8:15 pm Post subject:

matt_unique · Posted: Fri Jul 25, 2008 8:47 pm Post subject: Shoot thru hull

C-Hawk · Posted: Fri Jul 25, 2008 9:12 pm Post subject:

Warren, Matt

Thanks. I didn't think I had heard of this on a CD.

I was wondering about this and what the beam refraction would be as the beam waves passed through the different materials of various velocities.
As long as the 'ducer is mounted straight to the block, it should be ok. I've used standoffs before for straight beam, as well as wedges to create shearwave.

Roger

Doryman · Posted: Fri Jul 25, 2008 11:20 pm Post subject: Re: Shoot thru hull

Jack in Alaska · Posted: Fri Jul 25, 2008 11:46 pm Post subject:

Per Sea wolf's request I put 3 pic's of my transducer sliding mount in my photo album "HIGH TIDE" p.2.

Also........I contacted Garmin about mounting transducers side by side.........NO if the freq. is the same. Others above have pointed that out. IE, two 200 freq. transducers side by side will screw both of them up.

C-Hawk · Posted: Sat Jul 26, 2008 12:17 am Post subject:

In order to get good coverage of various depths you should have a 50/200kHz. I run mine with a split screen.
The 50kHz has a longer wave length and will read the deeper water better.
The 200kHz has a shorter wave length and will attenuate quicker- making it better at reading shallow water.

Roger

Jack in Alaska · Posted: Wed Aug 06, 2008 2:37 am Post subject:

Going against all advice I decided to install my transducers side by side on my homemade sliding mount "thingy". I will report how it works out.
The Hummingbird Matrix 37 will be on 83 and the Garmin 198c will be on dual 200/50.

Jack in Alaska

The experiment worked great. My transducers were set up as explained in post above side by side , one inch apart.
I have been out twice and used both depth finders and they both work perfectly. Then I put the Humm. on 200/83 with the Garmin on 200/50. They both worked good. I tried turning one then the other off and there was no difference.
Life is good once more on the HIGH TIDE.

Doryman

thataway · Posted: Fri Aug 08, 2008 5:40 pm Post subject:

The lower frequency transducers are better for deeper water. The higher frequency are for shallow water. The 83 was probably chosen as a compromise. I find that the 200 (plus or minus) do well up to 600 foot depths. Most of my depth finders are dual frequencies. I have used an 83 hz hummingbird (have one on the Century) and it is a decent in-expensive unit. A 50 and 83 mhz units should not interfere with each other.

I have found that solid glass with good coupling (I ususally use mineral oil) gives very little attenuation of the signal--beam width seems to remain about the same for all practical purposes.

Doryman · Posted: Fri Aug 08, 2008 6:50 pm Post subject:

jacuthbert · Posted: Mon May 02, 2011 5:49 pm Post subject: depth transducer location

In reading your threads about mounting a transducer, I noticed a suggestion about mounting in the aft bilge. I have a CDory 25. Is this do-able? Can it also be mounted in the splashwell in front of the motor?
Thanks
Amanda

Captains Cat · Posted: Mon May 02, 2011 5:55 pm Post subject:

What kind of transducer do you have Amanda? If it's one that mounts on the stern, outside of the hull, it cannot be mounted inside the boat. I suspect, if it's the one you got from a Brat, it's a fishfinder type that has to mount outside of the boat on the hull.

Charlie