Ratio Computers - No Support at All

[autrichon gris]

They told me by email whe i started to have problems to set the channels as opposite as possible, for example 3 and 18.
Cool if it's ok with 21 and 23.

By the way, on the last two dives the problem of disconexion between the transmitters ant the computer was partially resolved, even though the curves of air consumption show that it is not as smooth as i would like it to be.

 

[giddyupca]

i would try a few different channels and see if it helps, now i only get the odd interuption from the trasmitter

 

[pisauron]

What drives me crazy is the AI only goes as high as 256bar... Yet we have 300bar tanks here.

Prob can't be fixed with software

 

[Mobulai]

What drives me crazy is the AI only goes as high as 256bar... Yet we have 300bar tanks here.

Prob can't be fixed with software

Seems like a similar issue to what Garmin has on their CNS counter; what happens when you have for eg a 270bar tank? Does it overflow to 4bar? Or does it have some sanity check and just reads a “maximum”?

And if you dig into the scientific primary sources there is basically zero reliable experimental data for CNS% effects of pO2 above 1.6atm. The dive computer manufacturers are literally just making up numbers by extrapolating the curve out or applying arbitrary "safety" factors, and doing so in inconsistent ways. Like on your 20ft oxygen deco stop if you drop down to 21ft for a few seconds the computer's CNS% might spike way up, which probably doesn't reflect any physiological reality.

Garmin dive computers have a design flaw where they store the CNS% as an unsigned 8-bit integer (uint8). I've seen mine hit 255% on a dive and wrap around back to 0%, which is kind of hilarious.

 

[pisauron]

Seems like a similar issue to what Garmin has on their CNS counter; what happens when you have for eg a 270bar tank? Does it overflow to 4bar? Or does it have some sanity check and just reads a “maximum”?

It will just show the maximum (257~) until the pressure drops below it. The transmitter manual says it supports up to 250bar, for some strange reason.

 

[Mobulai]

It will just show the maximum (257~) until the pressure drops below it. The transmitter manual says it supports up to 250bar, for some strange reason.

Limitations of 8bit integers, probably the analog to digital converter on the transmitter only supports a max of 8 bits
Very slim chance it’s a software fixable issue
They probably mentioned 250bar to be on the safe side of not falsely advertising things

On the positive side, they implemented a sanity check/ signed integer so you don’t have to worry about it panicking after overflowing to 0

Sucks; but (for me) not a deal breaker, could be for you — I get your frustration

 

[pisauron]

Limitations of 8bit integers, probably the analog to digital converter on the transmitter only supports a max of 8 bits
Very slim chance it’s a software fixable issue
They probably mentioned 250bar to be on the safe side of not falsely advertising things

On the positive side, they implemented a sanity check/ signed integer so you don’t have to worry about it panicking after overflowing to 0

Sucks; but (for me) not a deal breaker, could be for you — I get your frustration

I don't have it on any other transmitter from Garmin, SW etc.
Strange decision to make it like that.

 

[Mobulai]

I don't have it on any other transmitter from Garmin, SW etc.
Strange decision to make it like that.

Can’t speak to their design choices, but essentially cost saving maybe

I do have an unsubstantiated guess, given what others in the thread have mentioned about packet drops issues and switching channels workaround: minimizing the bitrate of the data needed to be transmitted for a singular sample reading not to run into bigger issues of lost samples

All I can say for sure, not getting the best AI on the market award; the one feature I did like about ratio TXs is that they use the same charger as the computer

Maybe they should have gone with a standard mh8 transmitter instead tho