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HD", "broadband" and 1kw transducer

Old 08-12-2011, 11:39 PM
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Default HD", "broadband" and 1kw transducer

Hi all,

I have asked the similar question before (other forums); however I'd like to double check again before spending $$$:

I always thought 1kw transducers are required when fishing over, say, 200-300 meters; in a shallower water there is advantage in having one. Now, my sounder is a "broadband" HDS-8 and the transducer is P79. At the biats show I bumped into the Lowrance exhibition, and a new 270W 1kw transducer has been mentioned. Browsing the Airmar web site I noticed that this new one has "HD" and "Broadband" labels, why my P79 has not.

So my question is: if I upgrade, will there be an improvement in a shallower than 200-300 m waters - perhaps not because of 1kw but because of hd/broadband capability? Am I not using my HDS to its full capacity by having an "ordinary" transducer? Or these (hd, broadband, etc) are just sales buzzwords and the only thing that matters is 1kw, which I may not need if not going to the browns?

Many thanks
Old 08-14-2011, 02:06 AM
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It is not the wattage rating of a transducer that is its defining characteristic but its sensitivity in detecting a return pulse from a target.

By increasing the number quality piezoelectric elements and tuning them to properly transmit and detect the return pulse...the side affect just happens to be increased power handling capability.

The P79 has just a single piezoelectric element that is designed to handle dual frequencies...but is limited in both depth and sensitivity.....not because it is not a "Broadband" unit...but because it is only a single element transducer doing double duty.

The best thing anyone can do for any sonar is to upgrade to a multiple element transducer from a single element.
Old 08-14-2011, 02:57 AM
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Thank you very much, semperfifishing,

And the way I read the Airmar website, T270W is a multiple element transducer (ap leats at 50kHz?

Thanks

Originally Posted by semperfifishing View Post
It is not the wattage rating of a transducer that is its defining characteristic but its sensitivity in detecting a return pulse from a target.

By increasing the number quality piezoelectric elements and tuning them to properly transmit and detect the return pulse...the side affect just happens to be increased power handling capability.

The P79 has just a single piezoelectric element that is designed to handle dual frequencies...but is limited in both depth and sensitivity.....not because it is not a "Broadband" unit...but because it is only a single element transducer doing double duty.

The best thing anyone can do for any sonar is to upgrade to a multiple element transducer from a single element.
Old 08-15-2011, 06:05 AM
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Default Transducer Comparison

It is my understanding that Semperfifishing is correct. I have a B60 thru hull with an HDS-10. I can read bottom down to 800 feet or so on 200 kHz. See the transducer comparison below:

TRANSDUCER COMPARISON

B60 600 W Good Benchmark model for comparison

B164 1 kW Better 6 times more sensitive at 50 kHz
2 times more sensitive at 200 kHz

SS264N 1 kW Best 50 times more sensitive at 50 kHz
13 times more sensitive at 200 kHz

This is from Airmar: http://www.airmartechnology.com/uplo...chures/B60.pdf

The comparison for the P79 are similar: http://airmartechnology.com/uploads/brochures/P79.pdf
Old 08-15-2011, 08:24 AM
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The general rule of thumb in transducer engineering is this:

Doubling the crystal size is almost the same as quadrupling the output power. A transducer firing 200 watts thru a 8" crystal can reach depths similar to a transducer firing 800 watts thru a 4" crystal.

But more important than depth penetration is the ability of the larger multiple element transducer to accurately detect the faint return echos from deep targets.

The P66/P79 single element Airmar transducers are designed for shallow to mid water general fishing conditions and have provided good results and long service life for many years. And there are many upgrades available to improve upon the P66 or similar transducers for anyone wising to obtain increased sonar capability.









HERE IS A P66 COMPARED TO A GARMIN OEM TRANSDUCER.....THE P66 WILL OUTPERFORM THIS OEM HANDS DOWN.





HERE IS THE TM260 COMPARED TO THE P66...EASY TO SEE WHY THE TM260 IS 50 TIMES MORE SENSITIVE THAN THE P66.








HERE ARE SOME RETRACTABLE HIGH PERFORMANCE TRANSDUCERS THAT OF COURSE ARE FOR SOME VERY..VERY SERIOUS FISHING..LOL

Last edited by semperfifishing; 08-15-2011 at 08:43 AM.

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