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Does CHIRP care about Beamwidth?

Old 02-26-2012, 06:04 PM
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CME
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Default Does CHIRP care about Beamwidth?

Simple question really.
Does CHIRP care about beam degree's?

So if I guy has a normal transducer B164 having a Beamwidth of 22° @ 50khz and 6° @ 200Khz, what will a B175 have?

And/or, is that not the same as it's operating frequency? (L, M, or H)

I am confused....
Old 02-26-2012, 06:40 PM
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"Does CHIRP care about beam degree's..?"

Yes, cone coverage is very important and CHIRP transducers gives superb coverage.

Here are two flush mounted units.
The B175
L....32 to 21 degrees
M...24 to 16 degrees
H...15 to 9 degrees

B75
L....32 to 31 degrees
M...24 to 16 degrees
H...15 to 9 degrees

Last edited by semperfifishing; 02-26-2012 at 07:49 PM.
Old 02-27-2012, 07:08 AM
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So, as long as a required transducer physically fits the a given hole, then I guess all Chirp ducers have their own beamwidth.

So, rather a B744v, or a B260, or B45 (assuming all had the same shaft diameter) all would fall under ONE Chirp transducer......because the beam width and xtals are irrelevant?
Old 02-27-2012, 08:56 AM
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Originally Posted by CME View Post
So, as long as a required transducer physically fits the a given hole, then I guess all Chirp ducers have their own beamwidth.

So, rather a B744v, or a B260, or B45 (assuming all had the same shaft diameter) all would fall under ONE Chirp transducer......because the beam width and xtals are irrelevant?


It can be a bit hard to see this at times.
Look at it this way.
Cone angles do matter..every transducer transmits in a specific pattern..called a cone.

1. Every transducer regardless if it is a traditional tone pulse or a new CHIRP will have specific cone angles of its sonar beam depending upon the frequency it is transmitting.

2. Traditional tone pulse transducers have a fixed beam.
Example: The B260 has a cone of 19 degrees for its 50 kHZ frequency .
And the B260 will have a cone of 6 degrees on its 200 kHz frequency.

3. The CHIRP counterpart is a B265LH and on the low end it will have a
cone going from 25 to 16 degrees. (42 to 65 kHZ)
And on the high end the B265 will have a cone going from 10 to 6
Degrees. ( 130 to 210 kHZ)


Traditional transducers have a set cone angle.

CHIRP transducers cone angle's will actually change as the CHIRP sonar
"CHIRPS" across its frequency band.

Also..the B265LH is the same size as the B260 so it will retro fit into the B260's fairing.

The same with the other CHIRP transducers..most will retro fit into their traditional transducer counterparts spaces, mountings etc.

The B75 will retro into the B60
The B175 will retro into the B164
The M265 will retro into the M260
The B765 will retro into the B744 fairing
The B265 will retro into the B260's fairing.

Last edited by semperfifishing; 02-27-2012 at 09:40 AM.
Old 02-27-2012, 09:28 AM
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got it

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