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Old 14th March 2006, 21:42   #41 (permalink)
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Re: Rebreather Migration

Quote: (Originally Posted by silent running)
Hi mverick, thanks for the info. What I'm pointing out is the relative complexity and bulk/weight of handsets vs non button operated displays and switches. Not just the number of cables...

The Prism 2ndry is passive and has no high current in it when the unit is turned off. It's the only production unit currently available that is able to isolate the high and low current sides of the system, underwater. So the magnetic rotary sensor dial is purely mechanical and not part of the electronics. Also, the Prism cables will not leak back into the head if cut. Not sure about the Shearwater cables. And all of the electronics are in the head, not in the handsets, and thus less vulnerable to shock and abuse. The Prism on/of switch is very small-the size of a thumb-and fits on the inflator hose.

I was also refering to the YBOD, Boris, HammerHead and non deco Megs. I'm guessing the Shearwater is the only one with this simplicity of cables. Sure, you could tuck away the Shearwater controller, but it's meant to be put on the arm and it needs power to run it, unlike the Prism 2ndry, and I'm guessing it's bigger and heavier than the Prism 2ndry.
All the other units above have their merits and of course, some of us may have different ideas about the Kiss concept to begin with, so comparisons are difficult but still informative. -Andy

The Prism 2ndry and the Shearwater or Apecs is right at the same size and weight. I've had both in my hand. Apecs was a little smaller then the Shearwater. Although I haven't dove the Prism. I was leaning that way. The Prism was fatter but shorter. But the total size isn't that much different. I honestly couldn't tell you which is larger or heavier. It's not that big of difference to notice. I heard of someone making a smaller Prism handset for themself at the factory but had problems with distortion from pressure at depth. And that was why the Prism was as large as it was. For strength.

And saying it's meant to be worn on the wrist. Well, first shearwater was at the waist or counter lungs. So, it's meant to be where you want it. You can run it by the HUD. It is it's own puter. It doesn't just repeat what the Handset say's.

I know the simplicity thing of the Prism. But, it does have current coming from the O2 cells. Not high. But it does have current. I've read of some problems with it. I've also heard it was fixed.

The buttons on the meg are Mechanical. And not part of the electronics. Both Apecs and Shearwater. Use a magnet. The battery pods in the Meg are turned on magneticly also. Even though it's a switch. It doesn't penetrate the battery housing. Pretty slick.

And the Shearwater isn't the only one. The Hammer head only has 3 cables. As does the Apecs. Shearwater is the only one I know of with only 2. If I'm right. 3 is standard on most Rebreather's. And even though the on off switch is small. It still goes back into the head. Making a point of water ingress. Although, I've heard of no problems with it.

But, I don't know of any Megs that had handset flooding problems. Maybe so, But I don't know of any. I've heard of more problems with Prism Secondary's then Megs. That jeweled needle has had problems. Shearwater had problems with the first shipment if I'm right. It happens. It's new.

I believe in the simplicity of the Prism. But when there haven't been problems with the meg flooding the handsets. It's kinda a moot point. Leon builds a tight setup. He's done well with that.

I wish people would post more of there problems with there units. I've heard a lot on the side. They were worried about warranty issues. And the Company being ticked and not honoring the warranty. So, they didn't want to make it public. And, that's not with just one Rebreather company. Pretty much all of them. Kinda sucks.

I like most of the units out there. I have reasons I like the Meg. It travels well. Which cuts the Boris out. It's Cannister is solid. It has Deco for a brain check. So, My meg. A bottom timer and bailout tables is all I need. And it's proven over time. I honestly haven't heard any really bad things about Leon or the Meg. I can't say that about any other manufacturer. Speaks a lot about the Meg and Leon....
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Old 15th March 2006, 00:58   #42 (permalink)
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Re: Rebreather Migration

Quote: (Originally Posted by mverick)
The Prism 2ndry and the Shearwater or Apecs is right at the same size and weight. I've had both in my hand. Apecs was a little smaller then the Shearwater. Although I haven't dove the Prism. I was leaning that way. The Prism was fatter but shorter. But the total size isn't that much different. I honestly couldn't tell you which is larger or heavier. It's not that big of difference to notice. I heard of someone making a smaller Prism handset for themself at the factory but had problems with distortion from pressure at depth. And that was why the Prism was as large as it was. For strength.

And saying it's meant to be worn on the wrist. Well, first shearwater was at the waist or counter lungs. So, it's meant to be where you want it. You can run it by the HUD. It is it's own puter. It doesn't just repeat what the Handset say's.

I know the simplicity thing of the Prism. But, it does have current coming from the O2 cells. Not high. But it does have current. I've read of some problems with it. I've also heard it was fixed.

The buttons on the meg are Mechanical. And not part of the electronics. Both Apecs and Shearwater. Use a magnet. The battery pods in the Meg are turned on magneticly also. Even though it's a switch. It doesn't penetrate the battery housing. Pretty slick.

And the Shearwater isn't the only one. The Hammer head only has 3 cables. As does the Apecs. Shearwater is the only one I know of with only 2. If I'm right. 3 is standard on most Rebreather's. And even though the on off switch is small. It still goes back into the head. Making a point of water ingress. Although, I've heard of no problems with it.

But, I don't know of any Megs that had handset flooding problems. Maybe so, But I don't know of any. I've heard of more problems with Prism Secondary's then Megs. That jeweled needle has had problems. Shearwater had problems with the first shipment if I'm right. It happens. It's new.

I believe in the simplicity of the Prism. But when there haven't been problems with the meg flooding the handsets. It's kinda a moot point. Leon builds a tight setup. He's done well with that.

I wish people would post more of there problems with there units. I've heard a lot on the side. They were worried about warranty issues. And the Company being ticked and not honoring the warranty. So, they didn't want to make it public. And, that's not with just one Rebreather company. Pretty much all of them. Kinda sucks.

I like most of the units out there. I have reasons I like the Meg. It travels well. Which cuts the Boris out. It's Cannister is solid. It has Deco for a brain check. So, My meg. A bottom timer and bailout tables is all I need. And it's proven over time. I honestly haven't heard any really bad things about Leon or the Meg. I can't say that about any other manufacturer. Speaks a lot about the Meg and Leon....
Great post. You are wise beyond your years.
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Old 15th March 2006, 03:47   #43 (permalink)
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Re: Rebreather Migration

Quote: (Originally Posted by caveseeker7)
Everytime someone says "Phi" the frustration of not having even one dinghy little 'breather takes 15 mins off my life expectancy.
Hey be careful! I don't want to be on your life insurance company hit list...

Personally, I am a slow learner so I need to get my hands on the unit, take it apart, dive with it, modify it a bit, dive with it some more before I feel I know the unit. Thus the reason for cycling thru a number of units.

But a lot of people are much faster learners since it seems that they managed to know everything from just reading the Internet.
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Old 15th March 2006, 04:03   #44 (permalink)
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Re: Rebreather Migration

Quote: (Originally Posted by decoweenie)

But a lot of people are much faster learners since it seems that they managed to know everything from just reading the Internet.
that needed a COKE & COFFEE ALERT!!
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Old 15th March 2006, 04:22   #45 (permalink)
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Re: Rebreather Migration

With you on that one Jas, I've already given Phi positive feedback for that comment!!!

Except you mentioned coke and coffee, what about Coopers???
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Old 15th March 2006, 06:10   #46 (permalink)
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Re: Rebreather Migration

Perhaps the question that Steve was asking was:
Which rebreather is the one most moved away from?

Jason.
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Old 15th March 2006, 06:46   #47 (permalink)
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Re: Rebreather Migration

Quote: (Originally Posted by Jason Blackwell)
I think it comes down to the fact that as a user, you have spent $?,000.00 (of what ever currency you like here) most people will not bag their own unit as they are “financially tied”* to their purchase. So they wait until something else comes along purchases it. (And it always is an upgrade in their eyes)
A positive change is that if you now purchase one of the mainstream CRR units you can pretty much be certain of getting your money back if you wanted to sell it and move to another unit. This is an improvement from the days when the choice was a big gamble. It also means that there really is something significant in the fact that several of the Boris owners have held onto their Megs (apart from the fact that they clearly have waaay to much spending power).

I know Steve has been talking to Leon re future Meg improvements so I think we should take his original request on face value and make suggestion for positive change, even if the problems have not been sufficient to make us ‘trade up’ or opt for another unit in the first place. One of the great things with the CK was Gordon’s commitment to continuous improvement, let’s hope Leon will follow suit.

Personally I think the head latching mechanism could be better designed. I have had a couple of clips fail, although I think that was due mainly to mistreatment by the boat crew during a trip to Sri Lanka. Whatever the reason I still feel the design could be better. I would also prefer to have an externally mounted magnetic on/off switch. One final niggle (we all know what this means now I take it) is that he could do with someone to handle customers service as it is often hard to get a response from the hatchery. Otherwise I am very happy.

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Old 15th March 2006, 08:32   #48 (permalink)
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Re: Rebreather Migration

Quote: (Originally Posted by koputai)
Perhaps the question that Steve was asking was:
Which rebreather is the one most moved away from?

Jason.

By virtue of the fact it outsells the otheres 10-1, its the cheapest main stream unit and its the most readily available on the SH market that would have to be the Classic YBOD.

However I would argue that 95% of divers who move away from a YBOD are not doing so because they have reached the limit of its abilities Despite the loud shouts about it being built to a price and therefore not well built, I have yet to see or here about general bits falling of or breaking? The big complaints are always the electronics and cracking in the hand sets. Sadly I have herd about hand set problems with the HH the Vision and the Meg so I don't think this is going to change much.

ATB

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Old 15th March 2006, 09:16   #49 (permalink)
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Re: Rebreather Migration

Quote: (Originally Posted by mverick)
I know the simplicity thing of the Prism. But, it does have current coming from the O2 cells. Not high. But it does have current. I've read of some problems with it. I've also heard it was fixed.

The buttons on the meg are Mechanical. And not part of the electronics. Both Apecs and Shearwater. Use a magnet. The battery pods in the Meg are turned on magneticly also. Even though it's a switch. It doesn't penetrate the battery housing. Pretty slick.

And the Shearwater isn't the only one. The Hammer head only has 3 cables. As does the Apecs. Shearwater is the only one I know of with only 2. If I'm right. 3 is standard on most Rebreather's. And even though the on off switch is small. It still goes back into the head. Making a point of water ingress. Although, I've heard of no problems with it.

But, I don't know of any Megs that had handset flooding problems. Maybe so, But I don't know of any. I've heard of more problems with Prism Secondary's then Megs. That jeweled needle has had problems. Shearwater had problems with the first shipment if I'm right. It happens. It's new.

I believe in the simplicity of the Prism. But when there haven't been problems with the meg flooding the handsets. It's kinda a moot point. Leon builds a tight setup. He's done well with that.

I like most of the units out there. I have reasons I like the Meg. It travels well. Which cuts the Boris out. It's Cannister is solid. It has Deco for a brain check. So, My meg. A bottom timer and bailout tables is all I need. And it's proven over time. I honestly haven't heard any really bad things about Leon or the Meg. I can't say that about any other manufacturer. Speaks a lot about the Meg and Leon....



mverick, I'm not trying to rag on Leon or the Meg. I haven't heard anything bad either. This is not my point at all. So maybe some of the handsets out there aren't much bigger than the Prism 2ndry. But they are all more complicated and have high-battery-current running through them, which is of course provided by a battery(s). Again, I still think that what's at the end of any cables, what's flowing down them and how they are used is worth noting from a simplicity standpoint. Like it or not, integrated deco or SP controller handsets mean the high current side is always flowing from handset to the head and thus there are more points where this can be interupted and diminish function and information. And these handsets are typically meant to be moved around/taken on and off. The 2 high current Prism cables-HUD and on/off switch-are not hanging about and relocated during donning and doffing-they are snaked and fastened to hoses and thus recieve very little stress to their glans.

Also, any switches, magnetic or not, which are used to change electronics functions are not just mechanical. They are still dependent on the high current side of the unit, whether connected directly to the electronics or not as they would have no function without that high current. The magnets on the Prism 2ndry have no influence on the electronics functions and only serve to allow scrolling through the direct outputs of the sensors. It is entirely possible to run the Prism-and Mks-from the low current-sensor output-only side. No other units can be flown without the high current side. I don't see how one could argue that this is not a more simple design. Sorry for the long breeze, just trying to make sure I've been clear.-Andy
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Old 15th March 2006, 10:56   #50 (permalink)
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Re: Rebreather Migration

Bought a Boris, sold 2 Inspo, considering a Meg as a travel unit.
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