Question 2 on sonar??????

[Cane Pole]

I can't get a straight answer on this either. When you adjust the sensitivity of the sonar, are u adjusting the gain of the transmitter or the gain of the receiver? I called reps and got 2 different answers. Me, I think u just adjusting receiver gain (even with zoom). I base this on how ultrasound (air) works. Not sure. I too lazy too look up answers here....ha

[slabbatical]

I'm no expert but...changing the sensitivity = changing receiver gain makes sense to me...Seems if you changed the transmitter you would also need to change the transponder or it would give you a false reading.

[bella]

try this http://www.texasfishingforum.com/cgi...c;f=3;t=004504

[JIM 1]

CP I don't think it is possibe to increase the sensitivity of the sonar, I mean aren't they all are operating at the full capacity they have all the time reqargless of make or model??

Therefore you are increaseing the sensitivity, which would logically be all you have the power to increase. Am I missing something here?
JIM 1

"If you aren't Aijrborn, you are just another leg."

[HydroGrafx]

The transmit strength does not change unless you have a sonar that you can select high or low output power (or in between). Most consumer sonars transmit at a constant strength or amplitude. Better survey grade sounders allow several output power choices.

Gain adjusts the sensitivity of the microphone (so to speak). It's like turning down your hearing aid when your wife is yelling at you.

P. Hahs

[Cane Pole]

The transmit strength does not change unless you have a sonar that you can select high or low output power (or in between). Most consumer sonars transmit at a constant strength or amplitude. Better survey grade sounders allow several output power choices.

Gain adjusts the sensitivity of the microphone (so to speak). It's like turning down your hearing aid when your wife is yelling at you.

P. Hahs

What u saying here is that the "lower end" sonars ($1000.00 or less) is a receiver only adjustment. Just what I thought. So, how can anyone think they can extend the cone angle by adjusting the sensitivity? Can't happen as far as I can see. I would assume then that some of the manuf. over exagurate the capabilities of their lower end products...ha

Tom

[HydroGrafx]

What u saying here is that the "lower end" sonars ($1000.00 or less) is a receiver only adjustment. Just what I thought. So, how can anyone think they can extend the cone angle by adjusting the sensitivity? Can't happen as far as I can see. I would assume then that some of the manuf. over exagurate the capabilities of their lower end products...ha

Tom

Yes, most sonars we commonly use are receiver only adjustment (gain/sensitivity).

Do you have an example of a manufacturer that claims to extend (or widen)the cone angle by adjusting the sensitivity?

If you really want to make your noggin' spin go to www.airmar.com
They manufacturer most, if not all transducers we use. Find your way to any transducer page and then choose "Cross-reference guide", then "Frequency and technical data". Take a look at the Transmit Radiation patterns for various transducers.

That should make it all clear as mud.

PH

[Pomoxis 2]

What u saying here is that the "lower end" sonars ($1000.00 or less) is a receiver only adjustment. Just what I thought. So, how can anyone think they can extend the cone angle by adjusting the sensitivity? Can't happen as far as I can see. I would assume then that some of the manuf. over exagurate the capabilities of their lower end products...ha
Tom

Sensitivity adjust changes the receiver gain.
Cone angle is a transmit measurement, inherent in the transducer, and changing the receiver gain does not change it.
However, if you increase the sensitivity enough to pick up an object that was previously invisible, because it was at the outer edge of the cone, you could say that the visible cone angle was increased. At the same time though, you may flood the received signal with noise from the center of the cone. So it is NOT CORRECT to say increasing the sensitivity increases the cone angle.
As was stated, some sonars have adjustable cone angles by switching between different transducer crystals, and some more elaborate sonars may have adjustable transmit power.

[Cane Pole]

Yes, most sonars we commonly use are receiver only adjustment (gain/sensitivity).

Do you have an example of a manufacturer that claims to extend (or widen)the cone angle by adjusting the sensitivity?

If you really want to make your noggin' spin go to www.airmar.com
They manufacturer most, if not all transducers we use. Find your way to any transducer page and then choose "Cross-reference guide", then "Frequency and technical data". Take a look at the Transmit Radiation patterns for various transducers.

That should make it all clear as mud.

PH

I couldn't find me xducer on the list.. Must be a cheap skimmer. Lowrance 102c. Couldn't find anything on it.

[ShilohRed]

See if this will help clear it up.
http://www.hightechfishing.com/other...e_Tutorial.pdf
Pete