Subject: So you didn't know you could swap transducers between units?
A common misconception is to guess assumed transducers had to be tuned to a specific depth >sounder, like a SSB antenna.
Well: NO!!!!
They must have comparable Frequencies to interchange. a 50 HZ to >50Hz and 200 to 200Hz. I have gotten by running a 198Hz to a 200Hz and it worked well.
After all this is Analog electronincs and there is room for tweaking as it is a Art not a Science as they say.
The reason that there is some margin of plus & minus that will work is because the window of the waveform in not that percice that it absolutly will not accept adjacent or reciprical or resonant frequencies. Its a long,long explanation that is really very boring.
Justify to say that it works just like when the window in your house vibrate when a rap music Bloom la Mobile goes thumpa,thumpa down the street in front of your house it causes acoustic coupling.
A really neat trick that I like to do is crank up the fishfinders power until it slams the output into resonance and you get a fifth and seventh resonation that drives into the sand and mud below the boat and you can find not only sunken treasure but things buried in the muck!
Its fun to dive down and dig up somthing that was covered by three feet of sand that no one else knew was there.
Pop that together with a Magnatometer and an underwater metal dectetor and you have a nice treasure hunting package.
n generate the logic and power required to produce and interpert electrical signals that are then sent to the Transducer. Transducers: The componant that changes electrical impulses into sound waves and transmits the sound wave through water. It the acts as a reciver in reverse and takes the sound waves and changes them into electrical signals that can be processed by the transmitter reciever unit(Depth sounder, Fishfinder,Sonar) what ever the company may wish to call it for their market.If you are doing surveys as in for cash you arre going to need >somthing with a hardcopy read out.
That would be the Lowrance Blue Water Pro flasher/paper chart recorder that I have for sale. It includes a 200Hz transducer with it. A lot of the lower priced (Lower power) >Fishfinders/Sonars/Depthsounders have a transmitter packaged with the fishfinder.
For instance if you bought the JRC/Raytheon V850 model it would come with a transom mount 50/200hz transducer made of plastic. You can use that with most outboards/inboard outboards. If you have an inboard boat you then need to upgrade to a plastic or bronze thru hull mount unit that will give you much better performance and a higher quality signal. There are various quality transducers manufactured, Just as you have various quality types of stereo speakers rangeing from cheapo $10 K mart types to speakers costing thousands of dollars that will handle enormous ammouts of input powerand produce excellect acoustics with minimal distortion of the input signal. As has been said an expensice stereo is only as good as the speakers it drives.
The same logic applies to sonar units. You can buy the best highest power electronics fishfinder that is made and hook it to a cheap transducer and get garbage for results. If you overpower the transduce you will actuall blow it up. So.... The objective will dictate the tools required. If you only >need to know how deep the water is, then you can buy a cheap digital readout low power depthsounder. For more intricate uses you would need to upgrade.
The more power the better as long as your transducer is matched to accept the power and frequency. Frequency: Higher frequency yeild more resolution; but just like the shotgun shooting fine birdshot the distance and penetration power is reduced. Again adding more transmit power is like geting a bigger shotgun; but it has its limitations. Lower frequencies have better distance and penetration power when >transmiting and recieving a signal through deeper waters or waters that are dense from siltation or thermal refractions or biological interferance such as plankton, shrimp, baitfish, seaweed etc... So Its a trade off Bigger is better but more expensive. Higher >Frequencies give more resultion but their power is disapted quicker. Lower frequencies give better penatration but less resulution. And cone angle. Wider angles yeild bigger target ares but less quality of signal return due to signal loss and reflection. Tighter angles give more pinpoint results but require better positioning to hit the target. You need to evaluate what your potential target may be and the depth and type of water you will be working in. Survey: River? Ocean? Lake? Tidal? Depth? What does the customer >want for documentation? Paper printout? RS232? CD? FLOPPY? What software are they running?
I guess I need advice. I do underwater archeology and need a search sonar that is better for wreck-finding than the Interphase I have now. I can't afford a good sidescan unit like a Sea Scan or Kline, but perhaps your unit will be a workable compromise. The attached image was taken with a 600 kHz fish on a Sea Scan unit. It has more detail than I need for search but not enough for survey, so I'm hoping 200 kHz would be about right.What does your transducer drive -- or does it have its own monitor or display unit? Any problem mounting it in a 1/4-inch steel hull
Are you interested in the 28,50,200Hz 10,000 watt transducer? and what else? I could always box it up and ship it to you UPS or US Post?
So why have you read all of this? So you will know what a great deal you will be getting when you purchace my......
LOWRANCE Blue water Pro Flasher/Paper chart recorder Fishfinder. With Transom mount transducer. Commercial Grade model, Alum case. Excellent condition $199.
Airmar Low side lobe transducer 28khz,50khz,200khz 10,000 Watt (Thats right Ten Thousand Watts Power, Not a Toy!) Brand New! Includes cable, stuffing box, connector, and fairing block Asking $795.
Airmar Forward Downward dual beam 200khz transducer New! Asking $49.
Magnetic Paddlewheel Speed Sensor for Raytheon,Apelco,JRC, fishfinders. Brand new $10.
RAYTHEON 298 GPS/LORAN New Never Used ! Asking $295.
[email protected]
(This post edited by BEACHMOOOSE on 03/27/2003)
(This post edited by BEACHMOOOSE on 03/27/2003)
A common misconception is to guess assumed transducers had to be tuned to a specific depth >sounder, like a SSB antenna.
Well: NO!!!!
They must have comparable Frequencies to interchange. a 50 HZ to >50Hz and 200 to 200Hz. I have gotten by running a 198Hz to a 200Hz and it worked well.
After all this is Analog electronincs and there is room for tweaking as it is a Art not a Science as they say.
The reason that there is some margin of plus & minus that will work is because the window of the waveform in not that percice that it absolutly will not accept adjacent or reciprical or resonant frequencies. Its a long,long explanation that is really very boring.
Justify to say that it works just like when the window in your house vibrate when a rap music Bloom la Mobile goes thumpa,thumpa down the street in front of your house it causes acoustic coupling.
A really neat trick that I like to do is crank up the fishfinders power until it slams the output into resonance and you get a fifth and seventh resonation that drives into the sand and mud below the boat and you can find not only sunken treasure but things buried in the muck!
Its fun to dive down and dig up somthing that was covered by three feet of sand that no one else knew was there.
Pop that together with a Magnatometer and an underwater metal dectetor and you have a nice treasure hunting package.
n generate the logic and power required to produce and interpert electrical signals that are then sent to the Transducer. Transducers: The componant that changes electrical impulses into sound waves and transmits the sound wave through water. It the acts as a reciver in reverse and takes the sound waves and changes them into electrical signals that can be processed by the transmitter reciever unit(Depth sounder, Fishfinder,Sonar) what ever the company may wish to call it for their market.If you are doing surveys as in for cash you arre going to need >somthing with a hardcopy read out.
That would be the Lowrance Blue Water Pro flasher/paper chart recorder that I have for sale. It includes a 200Hz transducer with it. A lot of the lower priced (Lower power) >Fishfinders/Sonars/Depthsounders have a transmitter packaged with the fishfinder.
For instance if you bought the JRC/Raytheon V850 model it would come with a transom mount 50/200hz transducer made of plastic. You can use that with most outboards/inboard outboards. If you have an inboard boat you then need to upgrade to a plastic or bronze thru hull mount unit that will give you much better performance and a higher quality signal. There are various quality transducers manufactured, Just as you have various quality types of stereo speakers rangeing from cheapo $10 K mart types to speakers costing thousands of dollars that will handle enormous ammouts of input powerand produce excellect acoustics with minimal distortion of the input signal. As has been said an expensice stereo is only as good as the speakers it drives.
The same logic applies to sonar units. You can buy the best highest power electronics fishfinder that is made and hook it to a cheap transducer and get garbage for results. If you overpower the transduce you will actuall blow it up. So.... The objective will dictate the tools required. If you only >need to know how deep the water is, then you can buy a cheap digital readout low power depthsounder. For more intricate uses you would need to upgrade.
The more power the better as long as your transducer is matched to accept the power and frequency. Frequency: Higher frequency yeild more resolution; but just like the shotgun shooting fine birdshot the distance and penetration power is reduced. Again adding more transmit power is like geting a bigger shotgun; but it has its limitations. Lower frequencies have better distance and penetration power when >transmiting and recieving a signal through deeper waters or waters that are dense from siltation or thermal refractions or biological interferance such as plankton, shrimp, baitfish, seaweed etc... So Its a trade off Bigger is better but more expensive. Higher >Frequencies give more resultion but their power is disapted quicker. Lower frequencies give better penatration but less resulution. And cone angle. Wider angles yeild bigger target ares but less quality of signal return due to signal loss and reflection. Tighter angles give more pinpoint results but require better positioning to hit the target. You need to evaluate what your potential target may be and the depth and type of water you will be working in. Survey: River? Ocean? Lake? Tidal? Depth? What does the customer >want for documentation? Paper printout? RS232? CD? FLOPPY? What software are they running?
I guess I need advice. I do underwater archeology and need a search sonar that is better for wreck-finding than the Interphase I have now. I can't afford a good sidescan unit like a Sea Scan or Kline, but perhaps your unit will be a workable compromise. The attached image was taken with a 600 kHz fish on a Sea Scan unit. It has more detail than I need for search but not enough for survey, so I'm hoping 200 kHz would be about right.What does your transducer drive -- or does it have its own monitor or display unit? Any problem mounting it in a 1/4-inch steel hull
Are you interested in the 28,50,200Hz 10,000 watt transducer? and what else? I could always box it up and ship it to you UPS or US Post?
So why have you read all of this? So you will know what a great deal you will be getting when you purchace my......
LOWRANCE Blue water Pro Flasher/Paper chart recorder Fishfinder. With Transom mount transducer. Commercial Grade model, Alum case. Excellent condition $199.
Airmar Low side lobe transducer 28khz,50khz,200khz 10,000 Watt (Thats right Ten Thousand Watts Power, Not a Toy!) Brand New! Includes cable, stuffing box, connector, and fairing block Asking $795.
Airmar Forward Downward dual beam 200khz transducer New! Asking $49.
Magnetic Paddlewheel Speed Sensor for Raytheon,Apelco,JRC, fishfinders. Brand new $10.
RAYTHEON 298 GPS/LORAN New Never Used ! Asking $295.
[email protected]
(This post edited by BEACHMOOOSE on 03/27/2003)
(This post edited by BEACHMOOOSE on 03/27/2003)
