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Airmar M256 no longer sold.....

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Old 01-07-2004, 06:39 AM
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Default Airmar M256 no longer sold.....

I spoke with Gem Electronics at length yesterday and they told me that Airmar was basically pulling the m256 shoot-through transducer off the market. This is beacause of rare instances of interference (ringing ?) generated by certain hull thincknesses. I ended up ordering a m260 even though the I am most interested in bottom reading in less than 1000ft. Will the m260 produce as good results in the <1000ft range ? Should I have tried harder to get a m256 ?
Thanks.
Eric
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Old 01-07-2004, 06:50 AM
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Default Airmar M256 no longer sold.....

Now that's interesting. I look forward to further comments .... Peter?

Thom

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Old 01-07-2004, 08:57 AM
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Default Airmar M256 no longer sold.....

The M256 and M260 use the same mounting method, as a matter of fact they use the same exact mounting kit. The difference is in the transducer construction. The M256 has (4) dual frequency ceramics inside of it. Each of the four ceramics resonates at 50 and 200kHz at the same time. This can be compared to a full range speaker that has to produce highs, mid-range and bass all at the same time. It's a very cost affective solution but it has it's limitations. The M260 series uses 7 elements that only fire at 50kHz, and it also has a very large 200kHz element that only fires at 200kHz. Inside of the transducer there is a diplexer that works just like a crossover in a stereo. It splits the incoming signal up so that the 50 portion of the signal is directed to the 50kHz elements only, and the 200 is directed only to the 200kHz element. It also re-combines the return signals to send them back to the sounder. The M260 is very crisp in it's transmission, which we call low ringing. The M256 on the other hand has some ringing that affects it's ability to sound efficiently through some hulls. We have decided to leave the 256 series as a product that is always in the water (and it is very efficient and low cost) and when an in hull is required we will supply the M260 which has very little ringing and excellant performance shooting through the hull. There are many, many succesful installations using the M256 in hull, but moving forward we feel the results are much more consistent using the M260.

Peter Braffitt
Business Development Manager
AIRMAR Technology Corp.
Milford, NH USA
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Old 01-07-2004, 09:50 AM
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Default Airmar M256 no longer sold.....

pbraffitt,
thanks for the reply. I hope that the 200khz performance of the 260 will be equal to that of the 256 (in a shoot-through scenerio). I look forward to installing the unit and testing it (this weekend I hope) and reporting back.
Eric
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Old 01-07-2004, 10:58 AM
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Default Airmar M256 no longer sold.....

Peter,
Could you comment on the performance and expected release date for the new tilted element, through hull that has been on the website. I trailer a lot and would love to have a flush-mount that eliminates the fairing block...
Thanks
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Old 01-07-2004, 11:53 AM
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Default Airmar M256 no longer sold.....

Peter,
First, GREAT job your doing, thanks.

Another question for you: I don't see you talking about and don't see the product around much anymore (discontinued....?), the "Low-Profile Plastic Thru hull" transducer. The Raymarine part # is: M78922.

I've got this installed and REALLY love it. It's basically a flush mount, with no fuss. Just drill a hole and plop it in, done. I don't understand why this unit is not more popular??

Any comment?

Birdman, Capt of

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Old 01-08-2004, 08:00 AM
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Default Airmar M256 no longer sold.....

M256 transducer is amazing no doubt.

We've used it on our Donzi 32ZF hooked up to a Lowrance LCX-104C.

Furuno tech's, Them boys from Tulsa (Lowrance)are about to give ya a black eye.
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Old 01-08-2004, 09:46 AM
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Default Airmar M256 no longer sold.....

I am going to jump in with yet another question.

Can the M260 be used on a 24 degree hull?
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Old 01-08-2004, 12:28 PM
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Default Airmar M256 no longer sold.....

Silverg,

I think I can answer that question for you. The tank that the transducer is mounted in is precut to 30 degrees when you get it. It can, and should, then be trimmed to any lessor angle, so that it pointed directly down, down to the point where it could be mounted on a flat bottom. So, yes, 24 degrees would be an easy fit.

Thom

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Old 01-08-2004, 01:51 PM
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Default Airmar M256 no longer sold.....

Thanks Thom!
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