Everything You Need to Know About Transmitters and Wireless Air Integration

Shearwater Peregrine TX Dive Computer:
shearwater.com/products/pereg...
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[@baka-yarou]

When our son started diving with me 4 years ago at age 15, my wife (she doesn't dive) insisted that I maximize the safety factors. One of my solutions was to get myself a Shearwater Perdix AI with two transmitters. I mounted one of the transmitters on my 1st stage, I mounted the other on my son's 1st stage (both on a 6" HP hose). I also got him a hose-mounted AI dive computer (Aqualung 550 series) so he can keep track of his own dive data. With this setup, we're both diving on computers (safer than tables, IMO, and both are NITROX-capable) and as long as I'm diving next to him (he's my buddy so I'd better be pretty close, right?) I can see what his air pressure is without distracting him - usually this is a drive-by as I swim past him. The Perdix reconnects to his transmitter pretty quickly if I've gone out of range. I also have a separate analog SPG on my rig. I love the Perdix AI it's bombproof and way more capable than I'll probably ever need.

[@sebastienschaer8111]

#askmark would it be possible to explain how the SAC rate is calculated in the shearwater? It seems different that the SAC rate calculation that you can find in internet. I also know that everybody is different and the condition also affect this consumption , but what value would be a average SAC rate vs a good SAC rate?

[@Zhak2293]

I would like to know too!

[@UltimateLogbookApp]

Great insight, thanks Mark

[@timthenetchanter]

I just bought mine wioth a swift transmitter a couple of weeks ago after watching your review... great computer.. love it.. thanks for all the good work... and an extra perk is that they are Canadian as well.. so technically I am supporting local

[@Amplev-db4vo]

Great review Mark!

[@aliasincognito0]

As far as I'm concerned, there is nothing else one should consider other than Shearwater.

[@GaryWard23]

Opinions are like assholes. We've all got one and some are different to others. Shearwater do make good dive computers, but that would be akin to me suggesting that the only phone worth buying is a Samsung. Choice is a wonderful thing, as well as 'one size fits all' is a terrible prospect too.

[@HiroshimaXl]

Not even a competition

[@kabulbolan]

No

[@deanm.3881]

Mark, do you know of any studies on the effects of Bluetooth transmitters on underwater flora & fauna? I'm curious to know if any sea life are sensitive to BT and how it may affect them.

[@Yggdrasil42]

Bluetooth has no adverse effect on humans and the range is very short (about 1m/3ft) so I doubt there will be any effect on wildlife.

[@amazingtazz1579]

Just maybe when I was in the market for a now computer, I would consider shearwater. But at the time I needed one shearwater didn’t have any under €1000. I got the Suunto Eon Core and frankly…. After testing and comparing the xt,….. I can’t find a single thing that I miss and even have e few hundreds euros to spend on something else. 😉

[@ivoryjohnson4662]

You get what you pay for ..,. Think long term support out of area support etc. you are within a few hundred save your coins buy once cry once you will be happy in the long run

[@leemiller358]

#askmark - 4 dives on my Perdix 2 and loving the AI and the easy to read screen and functionality. Here's another question on SAC rate. Perdix is telling me my average SAC is 20.4 psi/min. My introductory understanding is if I want to convert to cubic feet/min (RMV - using DAN's definition) I would need to factor in tank volume and working pressure. Does Perdix allow for this? I have two tanks I routinely use that are slightly different. I don't see where I can enter "Tank 1- 100 cu ft, 3445 psi" and Tank 2- 100 cu ft, 3144 psi" in the computer. Shearwater associates the AI serial number to the tank to support up to 4 transmitters. How about managing multiple tanks with one transmitter.

[@ScubaDiverMagazine]

Shearwater remove cylinder volume from the equation, they explain why in their User Manual. I don't think you can enter cylinder volume in the Perdix but, some logging apps _will_ let you and do the calculations for you. But I believe Shearwater do it so that you can use the same transmitter on any cylinder and get similar numbers to compare

[@vertcaver]

#ask Mark, this may be a stupid question but I was curious as to how the pressures from a 3,000 psi tank to a 30 PSI is actually stepped down is it a metered orifice or a diaphragm with a spring load?

[@Yggdrasil42]

Look up how a scuba first stage works. There are some disassembly videos on YT and you can usually find the service manuals as a PDF online. The Apeks DST ones that I use have a diaphragm with a spring. They're stepped down to so-called Intermediate pressure of about 145 psi/10 bar. The remainder is done by the second stage (the thing in front of your mouth).

[@anirudhpoddar4413]

#askmark please do share some tips for storage and maintenance of the transmitter. I just purchased the Perdix 2 and Swift and has a chance to break it in last month. Given the investment in it any tips would be super helpful!

[@ScubaDiverMagazine]

They only need a wash and a dry. You just want to keep them clean and brush off any salt build up after a dive. Once your regs are thoroughly dry then store them in a safe dark place. Change the battery in the transmitter every 300 dives or 5 years, whichever comes first

[@TheCryingMonkey]

The sticker on my Apeks transmitter has come off and now I can’t connect it to my DSX as for some reason Apeks are one of the only MH8A transmitters that don’t etch the serial number on…completely stupid. Does anyone know if I’ve overlooked something here, otherwise I have a perfectly functional transmitter sat on a shelf

[@ScubaDiverMagazine]

That's a design flaw. I know a couple of things that may help. The serial number is usually on the outside of the box it came in, if you still have that, for easy tracking. There'll be two barcodes, one will be the S/N. It's also on one of the microchips inside of my AquaLung transmitter. If you change the battery, or take it in for a new battery, you may be able to see the S/N inside or ask the technician to take note of it while it's open. Yours may be a different generation to mine though, as the S/N is laser etched on mine but hopefully, you can find yours by looking at the box or inside it.

[@kabulbolan]

doing old school. Just spg and call it a day

[@daniel29263]

Back in the day they didn't have spgs, so why stop there?

[@linyasen5]

This is a perfect video for as I'm in the market for a dive comp with AI. I'm a new OW diver. Would you be able to go into a little more detail on how to change the battery of the transmitter? Thank you in advance!!

[@brandonm1088]

Every transmitter will be a little bit different but they come down to a water proof sheath and a battery. I suggest getting what makes the most sense for you and reading the service manual. If the manual suggests having a shop replace the battery you can always just take it in to be replaced during your regulator service.

[@linyasen5]

@@brandonm1088Thank you very much!! :)

[@GaryWard23]

I've been of the opinion (and like assholes we all have one that might be different to someone elses) AI is an awesome piece of technology looking for a problem to solve. Hear me out! Yes you get the benefit of knowing your tank pressure on your dive computer. Yes you get to see what your SAC rate is right now (but ask yourself what you can do with that information right now?). It can give you a proxy for how long your air *might* last at that depth too. All great stuff, but not exactly game changing. How much harder to do this (angles wrist towards face) versus this (grabs analogue gauge in front of me)? Its easier for sure - but is it $600 easier? When you consider the premium payed for the AI dive computer and the pod - you could have had another dive trip! Now I know I'm likely to get ripped a new opinion by the AI fan bois, but just stop for a moment and ask was it really that big a difference to your diving and at $600 do you still feel you've got value for money from ALL the extra information you have? Of course if money is no object - then sign me up for two.... On that - Saw a diver on the dive boat today with a $400 reg and $700 worth of pods plugged into the HP ports. She wanted a backup to her BT AI, so bought another BT AI dive computer as its more of a weight saving than having a HP hose and gauge!

[@brandonm1088]

I think of the SPG to a dive table. It's a great rule of thumb and you can see the data and act upon it. Done deal. But when computers came onto the scene people realized how much safer they were and more accurate they were than dive tables. You could do complex dive profiles safely now. AI comps these days give you lots of historical data that is live. Pre-AI I knew my start air and end air and dive time and water temp. With AI I can see how a thermocline affects my breathing or how quickly I breathe at the beginning of dive versus at the end etc. This information is a gold mine for self improvement and dive safety. Now that more people are using dive computers solo I think we will start seeing more analysis software coming out and that's going to be super cool.