Notices
 
Search: Posts Made By: E Fitzgerald
Showing results 1 to 25 of 65
Search took 0.05 seconds.
02-03-2006, 10:42 AM
Replies: 142
Views: 17,647
Posted By E Fitzgerald

Re: Thermoclines

Boatdork - you are right on! The imaging of thermoclines is a "system" question. You have to take into consideration, not just the transducer performance (mainly sensitivity), but also the sounder...
01-25-2006, 09:06 AM
Replies: 14
Views: 2,424
Posted By E Fitzgerald

Re: Furuno 600L transducer

The 1kw transducer has an array of piezoceramc elements inside as opposed to just one inside the lower-rated transducer. What that means is 1.) greater transmit sensitivity. Transmit sensitivity is...
12-27-2005, 10:56 AM
Replies: 14
Views: 9,636
Posted By E Fitzgerald

Re: Does Sonar scare fish?

Greetings all! Since there are approximately 25,000 species of fish then I would say that there are approximately 25,000 different answers to this question. Across this range of species there is a...
10-24-2005, 11:01 AM
Replies: 6
Views: 1,407
Posted By E Fitzgerald

Re: Transducer anti-fouling paint

Thank you for the replies and suggestions. The difficult fact is that the transducers are all underwater and cannot be removed. Whatever the antifouling "substance" will be it has to be applied...
10-20-2005, 02:56 PM
Replies: 6
Views: 1,407
Posted By E Fitzgerald

Transducer anti-fouling paint

Does anyone know of a anti-fouling paint that can be applied to a transducer when the transducer is in seawater? The transducers are attached to a bridge pier and cannot be removed. Thanks in...
09-16-2005, 07:32 AM
Replies: 9
Views: 2,542
Posted By E Fitzgerald

Re: Transducer

Wildfish - the 600wrms, dual frequency transducers I am familiar with have a single ceramic that can operate at both frequencies - though not simultaneously. The thickness of the ceramic is such...
09-15-2005, 10:20 AM
Replies: 9
Views: 2,542
Posted By E Fitzgerald

Re: Transducer

Wildfish - the diplexer is a signal splitter installed inside the transducer. Basically it is a circuit (typically a set of coils, inductors, and diodes) with two wires input and four wires output. ...
09-15-2005, 08:39 AM
Replies: 9
Views: 2,542
Posted By E Fitzgerald

Re: Transducer

Obald, I am glad I could help out.

I agree, the M260 performs better than the B256. About transformers, transformers will be used in a transducer when it is necessary to match the transducer...
09-14-2005, 08:08 AM
Replies: 9
Views: 2,542
Posted By E Fitzgerald

Re: Transducer

Transmit sensitivity relates to how many dB of acoustic energy are generated by the transducer per volt. The units are dB re 1micro Pascal per volt at 1 meter distance. Receive sensitivity tell how...
07-29-2005, 10:50 AM
Replies: 18
Views: 2,429
Posted By E Fitzgerald

Re: Higher sonar watts Questions???

Diver dave, so in order to decrease the beam width you need a larger acoustic aperture which means a larger ceramic (or an array). This increases the directivity index and, therefore, the power...
07-29-2005, 07:35 AM
Replies: 18
Views: 2,429
Posted By E Fitzgerald

Re: Higher sonar watts Questions???

The sounder sends an AC pulse (not DC). And the more likely equation to use in this case is W = V(squared) / R where W is your rms power, V is your rms volts from the sounder and R is the parallel...
07-28-2005, 07:45 AM
Replies: 18
Views: 2,429
Posted By E Fitzgerald

Re: Higher sonar watts Questions???

Steve - a transducer that has a higher input wattage rating also (typically) has higher sensititivity. Meaning that for every volt into the transducer it will produce more sound energy into the...
07-22-2005, 07:52 AM
Replies: 5
Views: 672
Posted By E Fitzgerald

Re: Sonar

How 'bout renting a side scan system (with either a hull mounted or pole mounted stave)? There are rental places for hydrographic survey and I am certain you rent a really nice set-up for a few...
07-15-2005, 03:06 PM
Replies: 15
Views: 764
Posted By E Fitzgerald

Re: triducer not reading speed?

Well, if it is the paddlewheel assembly I can think of two possible problems. Either the Hall cell inside the transducer has gone bad or the paddlewheel may not have the same magnetic strength as it...
07-15-2005, 07:38 AM
Replies: 15
Views: 764
Posted By E Fitzgerald

Re: triducer not reading speed?

Question - has the cable ever been cut and re-spliced for any reason?
06-13-2005, 01:46 PM
Replies: 8
Views: 1,117
Posted By E Fitzgerald

Re: Someone in the know about transducers

You will not find the transducer you want on the Furuno or Airmar sites because the transducers they show are all planer arrays of circular elements which are the basis of their standard,...
04-20-2005, 08:24 AM
Replies: 14
Views: 1,340
Posted By E Fitzgerald

Re: Damage to a Transducer???

I can think of a couple of reasons why you may not want to run a "dry" transducer for more than a few seconds. (Though the in-hull transducers such as those you mentioned are probably less affected.)...
03-31-2005, 12:32 PM
Replies: 145
Views: 23,939
Posted By E Fitzgerald

RE: Early report on New Airmar Tilted Element Transducer

Has anyone tried the retractable version of the tilted element? I am wondering how much shading there is by the through-hull fitting and if it affects sensitivity.

PLEASE DISREGARD - I HAD THE...
03-11-2005, 04:00 PM
Replies: 19
Views: 1,215
Posted By E Fitzgerald

RE: B256 or B260

For the canyon application the B260 beats the B256 for several reasons.
1. - Sidelobes - the B256 is an array of four dual-resonating elements. The fore/aft side lobes operating at 50kHz are -12db...
03-11-2005, 02:33 PM
Replies: 2
Views: 511
Posted By E Fitzgerald

RE: Transducer uses

Identify the transducer so you know the operating frequency, impedance, and rated input power in watts rms. Then you have a good shot at determining which FF's are compatible. One note, How old is...
03-11-2005, 02:29 PM
Replies: 2
Views: 640
Posted By E Fitzgerald

RE: Garmin GSD 20 with 1kw tranducers?

The lower Q does not necessarily mean higher sensitivity. In fact, except for a very small family of specially manufactured (and significantly higher priced) PZT, low Q typically means LOWER...
03-07-2005, 10:52 AM
Replies: 8
Views: 674
Posted By E Fitzgerald

RE: Temporary P-79 tranducer mount???

Mr. Tweiss,

Any news on the performance of the "super-low-Q" in-hull transducers? Did you get one? How does it perform? What is the cost? Thanks - E. Fitzgerald.
03-07-2005, 10:50 AM
Replies: 15
Views: 1,107
Posted By E Fitzgerald

RE: Just bought the Airmar tilted element transducer...

The tilted-element transducers are rated at 600watts rms (2% duty cycle). And I doubt that you will ever see a 1kw rms rated tilted-element transducer. The reason is that the fitting limits the size...
11-19-2004, 12:20 PM
Replies: 9
Views: 1,013
Posted By E Fitzgerald

RE: Airmar M260 Question

In constructing a low Q transducer design (like the 200kHz in M260) the common (economical) approach is to bond an acoustic matching layer of appropriate thickness directly to the silver electroded...
11-19-2004, 08:17 AM
Replies: 9
Views: 1,013
Posted By E Fitzgerald

RE: Airmar M260 Question

An important consideration is the differences in thermal expansion coefficients (TEC) of the various components that make up the transducer. I do not know the numbers (without looking them up) but...
Showing results 1 to 25 of 65
 


 
Forum Jump

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.