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Need Info on FishFinder
I would like to get some info about fishfinder:
1. Is this OK to mount a "shoot through hull" transducer right at the center line of the boat hull? The center line of the bottom of the hull is smooth; therefore, I am not expecting any turbulent at the center line. The reason why I ask is that we are not supposed to mount a transom-mount transducer at the center line where the outboard motor is to avoid the turbulent from the propeller. I am hoping that this restriction only applies to transom-mount transducer, and doesn't apply to "shoot through hull" transducer. 2. Is "shoot through hull" transducer good enough for scanning the sea bottom for fishes? In other words, I would like to know if I can use the fishfinder as a fish-finder instead of using it as a depth-sounder if I use a "shoot through hull" transducer. I only intend to use the fishfinder in shallow water, like 10-ft to 150-ft; hopefully, losing some range will not be a problem. 3. Does 3-D fishfinder present a relatively static picture instead of scrolling endlessly like a regular fishfinder? I have a hard time to interpret the scrolling image displayed in a regular fishfinder to relate it to the sea bottom. I am hoping that a 3-D fishfinder can solve this problem. Yes, I have already read a book about fishfinder; but I still cannot interpret the scrolling image. 4. Is 3-D fishfinder any good? 3-D fishfinder seemed to be "hot" a couple years or more ago. Recently when I checked Cabela's web site, I could only find _one_ 3-D fishfinder. Is this 3-D technology too immature that no other manufacturer wants to try? Thanks in advance for any info. Jay Chan |
Need Info on FishFinder
wrote in message ups.com... I would like to get some info about fishfinder: 1. Is this OK to mount a "shoot through hull" transducer right at the center line of the boat hull? The center line of the bottom of the hull is smooth; therefore, I am not expecting any turbulent at the center line. The reason why I ask is that we are not supposed to mount a transom-mount transducer at the center line where the outboard motor is to avoid the turbulent from the propeller. I am hoping that this restriction only applies to transom-mount transducer, and doesn't apply to "shoot through hull" transducer. 2. Is "shoot through hull" transducer good enough for scanning the sea bottom for fishes? In other words, I would like to know if I can use the fishfinder as a fish-finder instead of using it as a depth-sounder if I use a "shoot through hull" transducer. I only intend to use the fishfinder in shallow water, like 10-ft to 150-ft; hopefully, losing some range will not be a problem. "Shoot-thru-hull transducers are epoxied directly to the inside of fiberglass boat hulls. The sound is transmitted and received through the hull of the boat - but at the cost of some loss of sonar performance. (You won't be able to "see" as deep with a shoot-thru-hull transducer as one that's mounted on the transom.) The hull has to be made of solid fiberglass. Don't attempt to shoot through aluminum, wood, or steel hulls. Sound can't pass through air, so if there's any wood, metal, or foam reinforcement, it must be removed from the inside of the hull before installing the transducer. Another disadvantage of the shoot-thru-hull transducer is it can't be adjusted for the best fish arches. Although there are disadvantages to a shoot-thru-hull transducer, the advantages are considerable. One, it can't be knocked off by a stump or rock since it's protected inside the hull. Two, since there is nothing protruding into the water flow, it generally works quite well at high speed if it is mounted where a clean laminar flow of water passes over the hull. Three, it can't be fouled by marine growth. " IMO, the center line of the boat hull (aka--the keel) is probably not the best spot for the shoot-through transducer because this is usually the thickest portion of the hull. |
Need Info on FishFinder
wrote in message ups.com... I would like to get some info about fishfinder: 1. Is this OK to mount a "shoot through hull" transducer right at the center line of the boat hull? The center line of the bottom of the hull is smooth; therefore, I am not expecting any turbulent at the center line. The reason why I ask is that we are not supposed to mount a transom-mount transducer at the center line where the outboard motor is to avoid the turbulent from the propeller. I am hoping that this restriction only applies to transom-mount transducer, and doesn't apply to "shoot through hull" transducer. 2. Is "shoot through hull" transducer good enough for scanning the sea bottom for fishes? In other words, I would like to know if I can use the fishfinder as a fish-finder instead of using it as a depth-sounder if I use a "shoot through hull" transducer. I only intend to use the fishfinder in shallow water, like 10-ft to 150-ft; hopefully, losing some range will not be a problem. 3. Does 3-D fishfinder present a relatively static picture instead of scrolling endlessly like a regular fishfinder? I have a hard time to interpret the scrolling image displayed in a regular fishfinder to relate it to the sea bottom. I am hoping that a 3-D fishfinder can solve this problem. Yes, I have already read a book about fishfinder; but I still cannot interpret the scrolling image. 4. Is 3-D fishfinder any good? 3-D fishfinder seemed to be "hot" a couple years or more ago. Recently when I checked Cabela's web site, I could only find _one_ 3-D fishfinder. Is this 3-D technology too immature that no other manufacturer wants to try? Thanks in advance for any info. Jay Chan Fiberglass boat is OK to shoot through the hull. Most fishing style boats have a pad in the back area for transducers. They are made solid, no air pockets in it. Before mounting the transducer with epoxy, make a little dam of plumbers putty and fill the dam with water and set the transducer in the water to see if you get good results. |
Need Info on FishFinder
Mounting the transducer at the center line is not recommended.This is
because the thickness of the hull .This would definitely cut down on the return signal and make the readings erratic. wrote in message ups.com... I would like to get some info about fishfinder: 1. Is this OK to mount a "shoot through hull" transducer right at the center line of the boat hull? The center line of the bottom of the hull is smooth; therefore, I am not expecting any turbulent at the center line. The reason why I ask is that we are not supposed to mount a transom-mount transducer at the center line where the outboard motor is to avoid the turbulent from the propeller. I am hoping that this restriction only applies to transom-mount transducer, and doesn't apply to "shoot through hull" transducer. 2. Is "shoot through hull" transducer good enough for scanning the sea bottom for fishes? In other words, I would like to know if I can use the fishfinder as a fish-finder instead of using it as a depth-sounder if I use a "shoot through hull" transducer. I only intend to use the fishfinder in shallow water, like 10-ft to 150-ft; hopefully, losing some range will not be a problem. 3. Does 3-D fishfinder present a relatively static picture instead of scrolling endlessly like a regular fishfinder? I have a hard time to interpret the scrolling image displayed in a regular fishfinder to relate it to the sea bottom. I am hoping that a 3-D fishfinder can solve this problem. Yes, I have already read a book about fishfinder; but I still cannot interpret the scrolling image. 4. Is 3-D fishfinder any good? 3-D fishfinder seemed to be "hot" a couple years or more ago. Recently when I checked Cabela's web site, I could only find _one_ 3-D fishfinder. Is this 3-D technology too immature that no other manufacturer wants to try? Thanks in advance for any info. Jay Chan |
Need Info on FishFinder
My boat is a fiberglass boat, and I believe (not 100% sure) that the
bottom of the boat near the transom is made from solid fiberglass. Unfortunately, I don't see the "round black spot" that indicates the best spot for gluing down the transducer that other people mentioned. Well... I guess I will find out... I understand that the possibility of losing some signal strength if I use "shoot through hull" transducer. But this is acceptable. I am planning to add a second transducer to the with the trolling motor at the bow (for a second fishfinder) anyway. Therefore, I don't need to get perfect signal strength from the "shoot through hull" transducer; something acceptable is good enough. Seem like everyone says that I should not glue the shooot-through-hull transducer right at the center line. OK, I will have to move it off from the center line and need to experiment in different spots in the bilge area to find the best spot. Thanks for the warning. Jay Chan NOYB wrote: wrote in message ups.com... I would like to get some info about fishfinder: 1. Is this OK to mount a "shoot through hull" transducer right at the center line of the boat hull? The center line of the bottom of the hull is smooth; therefore, I am not expecting any turbulent at the center line. The reason why I ask is that we are not supposed to mount a transom-mount transducer at the center line where the outboard motor is to avoid the turbulent from the propeller. I am hoping that this restriction only applies to transom-mount transducer, and doesn't apply to "shoot through hull" transducer. 2. Is "shoot through hull" transducer good enough for scanning the sea bottom for fishes? In other words, I would like to know if I can use the fishfinder as a fish-finder instead of using it as a depth-sounder if I use a "shoot through hull" transducer. I only intend to use the fishfinder in shallow water, like 10-ft to 150-ft; hopefully, losing some range will not be a problem. "Shoot-thru-hull transducers are epoxied directly to the inside of fiberglass boat hulls. The sound is transmitted and received through the hull of the boat - but at the cost of some loss of sonar performance. (You won't be able to "see" as deep with a shoot-thru-hull transducer as one that's mounted on the transom.) The hull has to be made of solid fiberglass. Don't attempt to shoot through aluminum, wood, or steel hulls. Sound can't pass through air, so if there's any wood, metal, or foam reinforcement, it must be removed from the inside of the hull before installing the transducer. Another disadvantage of the shoot-thru-hull transducer is it can't be adjusted for the best fish arches. Although there are disadvantages to a shoot-thru-hull transducer, the advantages are considerable. One, it can't be knocked off by a stump or rock since it's protected inside the hull. Two, since there is nothing protruding into the water flow, it generally works quite well at high speed if it is mounted where a clean laminar flow of water passes over the hull. Three, it can't be fouled by marine growth. " IMO, the center line of the boat hull (aka--the keel) is probably not the best spot for the shoot-through transducer because this is usually the thickest portion of the hull. |
Need Info on FishFinder
Thanks for the instruction of testing the spot for good signal.
I am thinking of doing these to find the best spot: - With the boat sitting in the water, position the transducer over the gunwale, hold it in the water, and check the signal. Filling the bilge area with water, hand holding the transducer in a couple spots inside the bilge area, and compare the signal with what I get when I hold the transducer over the gunwale. Hopefully, I can find the a few good spots in this way. - Use the method that you have suggested to secure the transducer temporarily in the best spot that I have found in the previous step. Run the boat in various speeds to see I still can get good signal. If not, re-position the transducer using the method that you have described, and run the boat to test again... Hope this will work. I will see when spring comes. Now, I just need to figure out if plumbers putty will stick to wet surface. If not, I will have to find a different adhesive material. Jay Chan Bill McKee wrote: wrote in message ups.com... I would like to get some info about fishfinder: 1. Is this OK to mount a "shoot through hull" transducer right at the center line of the boat hull? The center line of the bottom of the hull is smooth; therefore, I am not expecting any turbulent at the center line. The reason why I ask is that we are not supposed to mount a transom-mount transducer at the center line where the outboard motor is to avoid the turbulent from the propeller. I am hoping that this restriction only applies to transom-mount transducer, and doesn't apply to "shoot through hull" transducer. 2. Is "shoot through hull" transducer good enough for scanning the sea bottom for fishes? In other words, I would like to know if I can use the fishfinder as a fish-finder instead of using it as a depth-sounder if I use a "shoot through hull" transducer. I only intend to use the fishfinder in shallow water, like 10-ft to 150-ft; hopefully, losing some range will not be a problem. 3. Does 3-D fishfinder present a relatively static picture instead of scrolling endlessly like a regular fishfinder? I have a hard time to interpret the scrolling image displayed in a regular fishfinder to relate it to the sea bottom. I am hoping that a 3-D fishfinder can solve this problem. Yes, I have already read a book about fishfinder; but I still cannot interpret the scrolling image. 4. Is 3-D fishfinder any good? 3-D fishfinder seemed to be "hot" a couple years or more ago. Recently when I checked Cabela's web site, I could only find _one_ 3-D fishfinder. Is this 3-D technology too immature that no other manufacturer wants to try? Thanks in advance for any info. Jay Chan Fiberglass boat is OK to shoot through the hull. Most fishing style boats have a pad in the back area for transducers. They are made solid, no air pockets in it. Before mounting the transducer with epoxy, make a little dam of plumbers putty and fill the dam with water and set the transducer in the water to see if you get good results. |
Need Info on FishFinder
I will keep the transducer away from the center line. I thought the
"avoid the center line" restriction only applied to "transom mounted" transducer. I didn't know that it also applies to "shoot through hull" transducer. Thanks for the warning. Jay Chan Russ K wrote: Mounting the transducer at the center line is not recommended.This is because the thickness of the hull .This would definitely cut down on the return signal and make the readings erratic. wrote in message ups.com... I would like to get some info about fishfinder: 1. Is this OK to mount a "shoot through hull" transducer right at the center line of the boat hull? The center line of the bottom of the hull is smooth; therefore, I am not expecting any turbulent at the center line. The reason why I ask is that we are not supposed to mount a transom-mount transducer at the center line where the outboard motor is to avoid the turbulent from the propeller. I am hoping that this restriction only applies to transom-mount transducer, and doesn't apply to "shoot through hull" transducer. 2. Is "shoot through hull" transducer good enough for scanning the sea bottom for fishes? In other words, I would like to know if I can use the fishfinder as a fish-finder instead of using it as a depth-sounder if I use a "shoot through hull" transducer. I only intend to use the fishfinder in shallow water, like 10-ft to 150-ft; hopefully, losing some range will not be a problem. 3. Does 3-D fishfinder present a relatively static picture instead of scrolling endlessly like a regular fishfinder? I have a hard time to interpret the scrolling image displayed in a regular fishfinder to relate it to the sea bottom. I am hoping that a 3-D fishfinder can solve this problem. Yes, I have already read a book about fishfinder; but I still cannot interpret the scrolling image. 4. Is 3-D fishfinder any good? 3-D fishfinder seemed to be "hot" a couple years or more ago. Recently when I checked Cabela's web site, I could only find _one_ 3-D fishfinder. Is this 3-D technology too immature that no other manufacturer wants to try? Thanks in advance for any info. Jay Chan |
Need Info on FishFinder
I've had shoot-thru transducers mounted on the center line with NO
appreciable loss of signal. Yes, the prohibition is normally for transom mounted t'ducers.... But, you have a number of suggestions for trying any position out...why not build the dam of plumbers putty on the center line and try it out also? -- RichG manager, Carolina Skiff Owners Group on MSN http://groups.msn.com/CarolinaSkiffOwners .. wrote in message ups.com... I will keep the transducer away from the center line. I thought the "avoid the center line" restriction only applied to "transom mounted" transducer. I didn't know that it also applies to "shoot through hull" transducer. Thanks for the warning. Jay Chan Russ K wrote: Mounting the transducer at the center line is not recommended.This is because the thickness of the hull .This would definitely cut down on the return signal and make the readings erratic. wrote in message ups.com... I would like to get some info about fishfinder: 1. Is this OK to mount a "shoot through hull" transducer right at the center line of the boat hull? The center line of the bottom of the hull is smooth; therefore, I am not expecting any turbulent at the center line. The reason why I ask is that we are not supposed to mount a transom-mount transducer at the center line where the outboard motor is to avoid the turbulent from the propeller. I am hoping that this restriction only applies to transom-mount transducer, and doesn't apply to "shoot through hull" transducer. 2. Is "shoot through hull" transducer good enough for scanning the sea bottom for fishes? In other words, I would like to know if I can use the fishfinder as a fish-finder instead of using it as a depth-sounder if I use a "shoot through hull" transducer. I only intend to use the fishfinder in shallow water, like 10-ft to 150-ft; hopefully, losing some range will not be a problem. 3. Does 3-D fishfinder present a relatively static picture instead of scrolling endlessly like a regular fishfinder? I have a hard time to interpret the scrolling image displayed in a regular fishfinder to relate it to the sea bottom. I am hoping that a 3-D fishfinder can solve this problem. Yes, I have already read a book about fishfinder; but I still cannot interpret the scrolling image. 4. Is 3-D fishfinder any good? 3-D fishfinder seemed to be "hot" a couple years or more ago. Recently when I checked Cabela's web site, I could only find _one_ 3-D fishfinder. Is this 3-D technology too immature that no other manufacturer wants to try? Thanks in advance for any info. Jay Chan |
Need Info on FishFinder
RichG wrote:
I've had shoot-thru transducers mounted on the center line with NO appreciable loss of signal. Yes, the prohibition is normally for transom mounted t'ducers.... But, you have a number of suggestions for trying any position out...why not build the dam of plumbers putty on the center line and try it out also? On a sailboat with a rounded hull like my Sandpiper 565, the common wisdom is to mount the transducer close to the centerline and forward of the keel. You want the unit to shoot straight down to the bottom, not off at an angle and the keel would create some turbulence. |
Need Info on FishFinder
"RichG" wrote in message om... I've had shoot-thru transducers mounted on the center line with NO appreciable loss of signal. Yes, the prohibition is normally for transom mounted t'ducers.... But, you have a number of suggestions for trying any position out...why not build the dam of plumbers putty on the center line and try it out also? -- RichG manager, Carolina Skiff Owners Group on MSN http://groups.msn.com/CarolinaSkiffOwners Don't Carolina skiffs have flat bottoms though? |
Need Info on FishFinder
"Harry Krause" wrote in message ... NOYB wrote: "RichG" wrote in message om... I've had shoot-thru transducers mounted on the center line with NO appreciable loss of signal. Yes, the prohibition is normally for transom mounted t'ducers.... But, you have a number of suggestions for trying any position out...why not build the dam of plumbers putty on the center line and try it out also? -- RichG manager, Carolina Skiff Owners Group on MSN http://groups.msn.com/CarolinaSkiffOwners Don't Carolina skiffs have flat bottoms though? Most do, some have a very very slight vee. But...the skiffs also have a couple of inches of flotation between the deck and the hull buttom's outer skin. Yes. Which means that the foam must first be scooped out before mounting the transducer on the centerline of the hull. |
Need Info on FishFinder
"NOYB" wrote in message k.net... "Harry Krause" wrote in message ... NOYB wrote: "RichG" wrote in message om... I've had shoot-thru transducers mounted on the center line with NO appreciable loss of signal. Yes, the prohibition is normally for transom mounted t'ducers.... But, you have a number of suggestions for trying any position out...why not build the dam of plumbers putty on the center line and try it out also? -- RichG manager, Carolina Skiff Owners Group on MSN http://groups.msn.com/CarolinaSkiffOwners Don't Carolina skiffs have flat bottoms though? Most do, some have a very very slight vee. But...the skiffs also have a couple of inches of flotation between the deck and the hull buttom's outer skin. Yes. Which means that the foam must first be scooped out before mounting the transducer on the centerline of the hull. Some of the boats have a pad for transducer mounting that has no foam. Is solid. I would expect CS to have this. |
Need Info on FishFinder
Shortwave Sportfishing wrote:
On 10 Jan 2006 13:12:39 -0800, " wrote: I understand that the possibility of losing some signal strength if I use "shoot through hull" transducer. But this is acceptable. not if you are planning on doing any serious fishing it isn't. Tom, Do you always transom mount the transducer or have you actually drill a hole through the hull (ouch)? -- Reggie ************************************************** ********************* If you would like to make rec.boats an enjoyable place to discuss boating, please do not respond to the political and inflammatory off- topic posts and flames. ************************************************** ********************* |
Need Info on FishFinder
Shortwave Sportfishing wrote:
On Wed, 11 Jan 2006 07:25:32 -0500, Reggie Smithers wrote: Shortwave Sportfishing wrote: On 10 Jan 2006 13:12:39 -0800, " wrote: I understand that the possibility of losing some signal strength if I use "shoot through hull" transducer. But this is acceptable. not if you are planning on doing any serious fishing it isn't. Tom, Do you always transom mount the transducer or have you actually drill a hole through the hull (ouch)? on the contender i have both. on the ranger, transom mount and thru hull - thru glass. thru glass sucks. Do you use both on the contender due to turbulence while underway? Why haven't you bite the bullet on the ranger and cut a hole for the transducer? I do not have a fish finder, just a depth gauge on my boat. For just reading depth, I have had no problems, but it is solid glass. -- Reggie ************************************************** ********************* If you would like to make rec.boats an enjoyable place to discuss boating, please do not respond to the political and inflammatory off- topic posts and flames. ************************************************** ********************* |
Need Info on FishFinder
Seem like you have experience in both a transom-mounted transducer and
a shoot-through-hull transducer. I would like to ask you these questions: o Does the use of a shoot-through-hull transducer cut down the depth of water that the transducer can scan but still maintain clear signal to spot fishes that are within range? If this is the case, it will be acceptable for me because I will only operate the boat in relatively shallow water. o Does the use of a shoot-through-hull transducer not only cut down the depth of water that the transducer can scan but also mess up the signal to the point that I cannot use it to spot fishes even the fishes are within range? If this is the case, I think I will only use the signal from the shoot-through-hull transducer for a depth gauge, and not for a fishfinder. And then I will need to add a second transducer to the bow-mounted trolling motor for a fishfinder. Thanks in advance for sharing your experience in the use of both types of transducers. I try to avoid using a transom mounted transducer because the bottom of the transom of my boat is sloping up from the center line all the way to the side of the hull. There is no place in the bottom of the transom that is level with the horizon. According to the mounting instruction and books about book electronics, I am supposed to mount a transom mounted transducer at the bottom of the transom that the bottom needs to be level with the horizon, and then point the transducer downward. This means there is no ideal place in my boat for a transom mounted transducer (plus the fact that the support rail of the trailer gets in the way). This is the reason why I only consider shoot-through-hull transducer and trolling motor transducer (and No I am not going to cut a hole at the bottom of my hull for a true "through hull" transducer). Jay Chan Shortwave Sportfishing wrote: On 10 Jan 2006 13:12:39 -0800, " wrote: I understand that the possibility of losing some signal strength if I use "shoot through hull" transducer. But this is acceptable. not if you are planning on doing any serious fishing it isn't. |
Need Info on FishFinder
Thanks for the good news. How good the signal that you get from the
shoot-through-hull transducer that you mount at the center line? Is it "good enough" for you to spot fishes in the water column? Or is it just good enough for a depth gauge, but not for a "fishfinder"? And yes, I will likely try many different spots inside the bilge area including the center line. I will flood the bilge area with water for the test anyway; testing one more spot for the purpose of finding possible spots (for further testing) should only take minutes if not seconds. Jay Chan RichG wrote: I've had shoot-thru transducers mounted on the center line with NO appreciable loss of signal. Yes, the prohibition is normally for transom mounted t'ducers.... But, you have a number of suggestions for trying any position out...why not build the dam of plumbers putty on the center line and try it out also? -- RichG manager, Carolina Skiff Owners Group on MSN http://groups.msn.com/CarolinaSkiffOwners . wrote in message ups.com... I will keep the transducer away from the center line. I thought the "avoid the center line" restriction only applied to "transom mounted" transducer. I didn't know that it also applies to "shoot through hull" transducer. Thanks for the warning. Jay Chan Russ K wrote: Mounting the transducer at the center line is not recommended.This is because the thickness of the hull .This would definitely cut down on the return signal and make the readings erratic. wrote in message ups.com... I would like to get some info about fishfinder: 1. Is this OK to mount a "shoot through hull" transducer right at the center line of the boat hull? The center line of the bottom of the hull is smooth; therefore, I am not expecting any turbulent at the center line. The reason why I ask is that we are not supposed to mount a transom-mount transducer at the center line where the outboard motor is to avoid the turbulent from the propeller. I am hoping that this restriction only applies to transom-mount transducer, and doesn't apply to "shoot through hull" transducer. 2. Is "shoot through hull" transducer good enough for scanning the sea bottom for fishes? In other words, I would like to know if I can use the fishfinder as a fish-finder instead of using it as a depth-sounder if I use a "shoot through hull" transducer. I only intend to use the fishfinder in shallow water, like 10-ft to 150-ft; hopefully, losing some range will not be a problem. 3. Does 3-D fishfinder present a relatively static picture instead of scrolling endlessly like a regular fishfinder? I have a hard time to interpret the scrolling image displayed in a regular fishfinder to relate it to the sea bottom. I am hoping that a 3-D fishfinder can solve this problem. Yes, I have already read a book about fishfinder; but I still cannot interpret the scrolling image. 4. Is 3-D fishfinder any good? 3-D fishfinder seemed to be "hot" a couple years or more ago. Recently when I checked Cabela's web site, I could only find _one_ 3-D fishfinder. Is this 3-D technology too immature that no other manufacturer wants to try? Thanks in advance for any info. Jay Chan |
Need Info on FishFinder
On 11 Jan 2006 11:02:48 -0800, "
wrote: Seem like you have experience in both a transom-mounted transducer and a shoot-through-hull transducer. I would like to ask you these questions: o Does the use of a shoot-through-hull transducer cut down the depth of water that the transducer can scan but still maintain clear signal to spot fishes that are within range? If this is the case, it will be acceptable for me because I will only operate the boat in relatively shallow water. o Does the use of a shoot-through-hull transducer not only cut down the depth of water that the transducer can scan but also mess up the signal to the point that I cannot use it to spot fishes even the fishes are within range? If this is the case, I think I will only use the signal from the shoot-through-hull transducer for a depth gauge, and not for a fishfinder. And then I will need to add a second transducer to the bow-mounted trolling motor for a fishfinder. Thanks in advance for sharing your experience in the use of both types of transducers. I try to avoid using a transom mounted transducer because the bottom of the transom of my boat is sloping up from the center line all the way to the side of the hull. There is no place in the bottom of the transom that is level with the horizon. According to the mounting instruction and books about book electronics, I am supposed to mount a transom mounted transducer at the bottom of the transom that the bottom needs to be level with the horizon, and then point the transducer downward. This means there is no ideal place in my boat for a transom mounted transducer (plus the fact that the support rail of the trailer gets in the way). This is the reason why I only consider shoot-through-hull transducer and trolling motor transducer (and No I am not going to cut a hole at the bottom of my hull for a true "through hull" transducer). Jay Chan Shortwave Sportfishing wrote: On 10 Jan 2006 13:12:39 -0800, " wrote: I understand that the possibility of losing some signal strength if I use "shoot through hull" transducer. But this is acceptable. not if you are planning on doing any serious fishing it isn't. Jay, the transducer can be mounted vertically even though there is a slope to the transom. The transducer doesn't have to 'line up' with the bottom of the transom. -- John H. "Divide each difficulty into as many parts as is feasible and necessary to resolve it." Rene Descartes |
Need Info on FishFinder
JohnH wrote:
On 11 Jan 2006 11:02:48 -0800, " wrote: Seem like you have experience in both a transom-mounted transducer and a shoot-through-hull transducer. I would like to ask you these questions: o Does the use of a shoot-through-hull transducer cut down the depth of water that the transducer can scan but still maintain clear signal to spot fishes that are within range? If this is the case, it will be acceptable for me because I will only operate the boat in relatively shallow water. o Does the use of a shoot-through-hull transducer not only cut down the depth of water that the transducer can scan but also mess up the signal to the point that I cannot use it to spot fishes even the fishes are within range? If this is the case, I think I will only use the signal from the shoot-through-hull transducer for a depth gauge, and not for a fishfinder. And then I will need to add a second transducer to the bow-mounted trolling motor for a fishfinder. Thanks in advance for sharing your experience in the use of both types of transducers. I try to avoid using a transom mounted transducer because the bottom of the transom of my boat is sloping up from the center line all the way to the side of the hull. There is no place in the bottom of the transom that is level with the horizon. According to the mounting instruction and books about book electronics, I am supposed to mount a transom mounted transducer at the bottom of the transom that the bottom needs to be level with the horizon, and then point the transducer downward. This means there is no ideal place in my boat for a transom mounted transducer (plus the fact that the support rail of the trailer gets in the way). This is the reason why I only consider shoot-through-hull transducer and trolling motor transducer (and No I am not going to cut a hole at the bottom of my hull for a true "through hull" transducer). Jay Chan Shortwave Sportfishing wrote: On 10 Jan 2006 13:12:39 -0800, " wrote: I understand that the possibility of losing some signal strength if I use "shoot through hull" transducer. But this is acceptable. not if you are planning on doing any serious fishing it isn't. Jay, the transducer can be mounted vertically even though there is a slope to the transom. The transducer doesn't have to 'line up' with the bottom of the transom. JohnH, What my dealer did in my hull is cut a piece of pvc pipe at the same angle as the hull. They filled the pvc with resin and then attached the transducer to the flat surface. I was concerned about all that glass, but it worked perfectly as a depth finder. -- Reggie ************************************************** ********************* If you would like to make rec.boats an enjoyable place to discuss boating, please do not respond to the political and inflammatory off- topic posts and flames. ************************************************** ********************* |
Need Info on FishFinder
On Wed, 11 Jan 2006 15:24:31 -0500, Reggie Smithers
wrote: JohnH wrote: On 11 Jan 2006 11:02:48 -0800, " wrote: Seem like you have experience in both a transom-mounted transducer and a shoot-through-hull transducer. I would like to ask you these questions: o Does the use of a shoot-through-hull transducer cut down the depth of water that the transducer can scan but still maintain clear signal to spot fishes that are within range? If this is the case, it will be acceptable for me because I will only operate the boat in relatively shallow water. o Does the use of a shoot-through-hull transducer not only cut down the depth of water that the transducer can scan but also mess up the signal to the point that I cannot use it to spot fishes even the fishes are within range? If this is the case, I think I will only use the signal from the shoot-through-hull transducer for a depth gauge, and not for a fishfinder. And then I will need to add a second transducer to the bow-mounted trolling motor for a fishfinder. Thanks in advance for sharing your experience in the use of both types of transducers. I try to avoid using a transom mounted transducer because the bottom of the transom of my boat is sloping up from the center line all the way to the side of the hull. There is no place in the bottom of the transom that is level with the horizon. According to the mounting instruction and books about book electronics, I am supposed to mount a transom mounted transducer at the bottom of the transom that the bottom needs to be level with the horizon, and then point the transducer downward. This means there is no ideal place in my boat for a transom mounted transducer (plus the fact that the support rail of the trailer gets in the way). This is the reason why I only consider shoot-through-hull transducer and trolling motor transducer (and No I am not going to cut a hole at the bottom of my hull for a true "through hull" transducer). Jay Chan Shortwave Sportfishing wrote: On 10 Jan 2006 13:12:39 -0800, " wrote: I understand that the possibility of losing some signal strength if I use "shoot through hull" transducer. But this is acceptable. not if you are planning on doing any serious fishing it isn't. Jay, the transducer can be mounted vertically even though there is a slope to the transom. The transducer doesn't have to 'line up' with the bottom of the transom. JohnH, What my dealer did in my hull is cut a piece of pvc pipe at the same angle as the hull. They filled the pvc with resin and then attached the transducer to the flat surface. I was concerned about all that glass, but it worked perfectly as a depth finder. You're talking about a shoot-thru-hull transducer, correct? I was referring to an external, transom mounted transducer. Maybe my terminology was wrong. -- John H. "Divide each difficulty into as many parts as is feasible and necessary to resolve it." Rene Descartes |
Need Info on FishFinder
Shortwave Sportfishing wrote:
On 10 Jan 2006 13:12:39 -0800, " wrote: I understand that the possibility of losing some signal strength if I use "shoot through hull" transducer. But this is acceptable. not if you are planning on doing any serious fishing it isn't. On 11 Jan 2006 11:02:48 -0800, " wrote: Seem like you have experience in both a transom-mounted transducer and a shoot-through-hull transducer. I would like to ask you these questions: o Does the use of a shoot-through-hull transducer cut down the depth of water that the transducer can scan but still maintain clear signal to spot fishes that are within range? If this is the case, it will be acceptable for me because I will only operate the boat in relatively shallow water. o Does the use of a shoot-through-hull transducer not only cut down the depth of water that the transducer can scan but also mess up the signal to the point that I cannot use it to spot fishes even the fishes are within range? If this is the case, I think I will only use the signal from the shoot-through-hull transducer for a depth gauge, and not for a fishfinder. And then I will need to add a second transducer to the bow-mounted trolling motor for a fishfinder. Thanks in advance for sharing your experience in the use of both types of transducers. I try to avoid using a transom mounted transducer because the bottom of the transom of my boat is sloping up from the center line all the way to the side of the hull. There is no place in the bottom of the transom that is level with the horizon. According to the mounting instruction and books about book electronics, I am supposed to mount a transom mounted transducer at the bottom of the transom that the bottom needs to be level with the horizon, and then point the transducer downward. This means there is no ideal place in my boat for a transom mounted transducer (plus the fact that the support rail of the trailer gets in the way). This is the reason why I only consider shoot-through-hull transducer and trolling motor transducer (and No I am not going to cut a hole at the bottom of my hull for a true "through hull" transducer). Jay Chan JohnH wrote: Jay, the transducer can be mounted vertically even though there is a slope to the transom. The transducer doesn't have to 'line up' with the bottom of the transom. -- John H. "Divide each difficulty into as many parts as is feasible and necessary to resolve it." Rene Descartes OK. I guess this has to do with whether the boat is deep-V or semi-V. If the slope is not too much, I have a feeling that a transom mounted transducer will work. Anyway, I am not likely to use a transom mounted transducer. But I will keep this in mind just in case the "shoot through hull" transducer doesn't work good enough for me. Jay Chan |
Need Info on FishFinder
Shortwave Sportfishing wrote:
On 11 Jan 2006 11:02:48 -0800, " wrote: Seem like you have experience in both a transom-mounted transducer and a shoot-through-hull transducer. I would like to ask you these questions: o Does the use of a shoot-through-hull transducer cut down the depth of water that the transducer can scan but still maintain clear signal to spot fishes that are within range? If this is the case, it will be acceptable for me because I will only operate the boat in relatively shallow water. not per se, but it will degrade the performance. o Does the use of a shoot-through-hull transducer not only cut down the depth of water that the transducer can scan but also mess up the signal to the point that I cannot use it to spot fishes even the fishes are within range? If this is the case, I think I will only use the signal from the shoot-through-hull transducer for a depth gauge, and not for a fishfinder. And then I will need to add a second transducer to the bow-mounted trolling motor for a fishfinder. no, but again. the degradation of signal just means that it will not be as sensitive to return signals as it ordinarily would be if it were in the clear water. sonar transducers are designed and tuned in clear water and not in a shoot thru configuration. having said that,, sometimes the higher frequency transducers will see epoxy and fiberglass as relatively transparent, but it has to be a solid part of the hull - and i do mean solid. as to mounting it center line, if you have a modified or deep vee, it's not a good idea. they make pucks so that you can mount a transducer on the inside of the hull angled so that it will shoot straight down. I'm not a fan of centerline mounting as there can be issues with uneven thickness of resin and glass. the general rules about transom mounting are this - mount it such that it will hang below the edge of the transom in clear water at least 18 inches away from the motor. most transoms are at a three degree angle and the mounting bracket will allow you to adjust for that to keep the transducer horizontal. if you have to mount it at the edge of the transom, that's fine too, just make sure it's in clear water. either way, it will work for you, it's just that transom mounting or a true thru hull works much better than shooting through the hull. thats a lot of typing for usign two fingers. I appreciate the info that you have shared with me. Seem like I will have to try installing a "shoot through hull" transducer to see if it will work OK or not. And I will keep in mind of the suggestion of using a high frequency transducer to overcome the resistance of the hull. Jay Chan |
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