How Transmitters Work & The Differences | Deep Dive
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- เผยแพร่เมื่อ 5 ส.ค. 2024
- How Transmitters Work & The Differences | Deep Dive
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Nowadays we have wireless digital transmitters that can send tank pressure data directly to your dive computer so you don’t even need a submersible pressure gauge. There’s a debate online, because of course there is, it’s the internet, about whether we’re happy to shift 100% over to wireless gas management, or to keep a SPG, or trust that a transmitter will do the job, but we’re not going to talk about that very much here, that’s a different video, and I AM SURE, there will be comments down below about people who use transmitters and people who are too good for transmitters, but that’s not what this video is about, this video is about how transmitters work and the differences
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Always used transmitters. Love it.
Will carry an spg on deep dives, but I’m confident in the tech. If it fails and doesn’t show my gas within a minute I’ll end the dive, just like any kit malfunction
Recently started using the Suunto tank pod connected to an eon core. Definitely keep my spg connected as a backup, but absolutely love the AI. Have about 25 dives on it in the last couple of months and it’s been flawless. Super convenient to have the air pressure reading right on my wrist rather than having to look at the gauges clipped off (with a retractor) on my BCD. It’s also very cool to be able to monitor consumption rates and gas time during the dive in addition to pressure...an incredibly helpful tool to improve consumption. Thanks Mark!
I do the same I use a tank pod but use an SPG too just incase WiFi goes down etc.
I love the extra info you can get from integrating tank pressure into the Dive Computer, a useful improvement in situational awareness. I'd agree with you and always recommend using a 6" hose to connect the transmitter into the 1st stage to make the pod a bit more resistant to knocks. I'd also recommend a flow restrictor, although nowadays they probably all have them anyway.
I use a conventional SPG too, but as you say that's a different discussion.
Hey guys! Just wanted to pop by and tell you all about my first experience diving at lake Mohave in Arizona that I had this morning ! I saw a MASSIVE school striper bass! There was easily over a thousand fish I was only 51 ft of water next to a sunken school bus the visibility was INCREDIBLE (for a lake) 70ft! I had such a good time they have hoops and things to swim through there at what’s called the cabinsite super awesome place to dive oh water temp was 54f surface temp was about 58 and I wore my 7mm semi dry and froze for two dives! Totally worth it tho! I can’t wait for d.u.i Cortez dry suit to show up love you guys can’t wait to watch this video I’m sure it’ll Be great like every other one ❤️✌🏼👌🏻
I'm diving without an SPG for about a year now and I had countless discussions about it. :D One hose less, one failure point less and if my transmitter ever fails, which it never did so far, it's not a huge problem. I only dive with buddies with a pretty similar air consumption, so I would cut the dive short to be on the safe side. The funny thing is, most of the time I don't have to discuss with experienced divers, but with people who are faily new to scuba diving.
I also dive transmitters (two, in sidemount) without SPG backup but to be honest, if one of them failed I would thumb the dive. And that's with two tanks. I can guestimate my remaing gas levels but don't want to end up in an emergency where someone else depends on my gas and I don't have a way to measure it.
Redundancy is EVERYTHING in systems. I don't care if you have 5000 dives. I'm a pilot and an engineer. We have redundant systems everywhere for a reason. What you're doing is simply showing that you don't value your life much. Nothing happens, until something happens... but hey... suit yourself...
@@deathcoder Great point. Murphy's law
@@deathcoderGot to agree here 👌🏻
4:22 some ideas on why you may want bi-direction communication in designs. Negotiate frequency, activate solenoids, pairing different probes on different tanks together, solenoid activation (e.g. shut off tank/turn on tank, auto-switchover of CCR to OC or vise-versa), diagnostics, etc.
The things are damn expensive and with sidemount you need two. I just managed to pick up two second hand Aqualung transmitters for my Shearwater for a much nicer price. Done just a few dives with them but very nice so far. Too bad the Perdix doesn't calculate SAC over both tanks.
I got a Mares transmitter last year. So far no connection issues. You really can see your detailed SAC rate during the dive and how much longer your tank will support you. It is said just need one time pairing even after battery change, or user actually un-pair it. I always worried about someone breaking the transmitter on the boat and finally saw Mark's suggestion on using a 15cm HP hose in earlier video, a very usefull tip.
It's best to let it stabilise after depth changes, particularly initial descent, as the SAC and gas time remaining will be affected by BC and/or suit inflation.
Yeah, they can be very useful. And having the data in your log can help you improve your gas planning. I'd recommend still having a basic gas planning in your head so you don't come to depend on the 'remaining time' number. If your transmitter or computer breaks it'll be much safer since you know approx how many minutes of gas you had left at this point in your dive.
Just a little tech wonk stuff, most transmitters are RF and are going to transmit on a LF frequency (about 37-39Khz) This is because higher frequencies don't work well underwater. Garmin's transmitter is unique, as it uses sonar to talk to the Descent MkII.
Did you swallow the mic? Damn, that's flawless audio quality! hahaha
Thanks for all the info! Much appreciated!
Great video guys!
thank RVbilly!
My son finally tried his new dive computer and he cant wait to go diving at the quarry in a few months.
since 2013 diving with the aeris elite t3 never had any troubles with its transmitter. changed its battery i think 4-5 times since i got it. both the computer and the transmitter
8:00 so my old transmitter should work with the Shearwater Perdix
i was thinking if i should get one and now you just give me a reason.
great video thanks .
I used AI from the very beginning, since my owd course. So I never dove without it. Yet an analog spg is always backing up my transmitters.
Now, entered the realms of tech diving, I got transmitters on all my tanks. Accepting the risk of additional failure points for the benefit of increased situational awareness and safety. As AI alerts me, if for any reason, my gas runs low. Plus the estimated ground time remaining feature based on actual air consumption is a nice feature to. Till now, touch wood, never had any issues with AI, nor ran into trouble due to incorrect measurements/data.
I have got the Suunto tank pod. I still use an SPG as precaussion though ✌🏻
Thanks Mark.
My aqualung transmitter stopped working a few minutes into a dive, just flashing - - dashes - - on my oceanic oci, I still have an SPG but we aborted the dive since we were so close to the shore anyway, when I tried to unscrew it the transmitter was very hot to the touch. The battery compartment could not be opened, anyway after sending it back the shop said the battery was fried and the inside was a mess. Aqualung replaced it no issue.
Wow. Batteries remain fickle things.
I'd like someone to do a Wireless Air Integrated 1st stage regulator, to avoid the stupid flappy hose and bring the ultimate in robustness! Perhaps even if the MEMS pressure sensor was interated to allow HP system integrity, the actually POD could then just be the battery and radio unit on a short flying lead?
Hey guys sorry for off topic, but I have a question. Do you think going to a sauna on the dive day, but keeping at least a few hours in between is a good idea? Thanks in advance
Not really. In tech diving circles it's discouraged since it can cause DCS. Of course the chance is pretty low, especially in rec diving, but depending on your dive profile and repeated diving can increase significantly and there's no easy way to tell when it's safe.
@@Yggdrasil42 Yea, thats what I thought, decided not to use sauna on a dive day, or going before a dive. It’s easier to let go than to worry if it’s ok. Thanks for replying
I use Suunto and I have never had a pod lose its pairing, even after an interval of months. On using multiple transmitters, as I understand it the pairing tech is the same principle as Bluetooth, and once coded together there is little chance that other similar signals will corrupt the connection.
Sunnto use unique ID numbers for each POD, and therefore once you have paired your computer, it stays paired! Because the necessary update rate is so slow (doesn't really matter if you only get a pressure update say once every 10 secs) then the PODs simply have a spread TX timing, so if multiple pods are in range and transmit at the same time, the computer just ignores the garbage data and waits for the next time
@@maxtorque2277 I believe it's Time Division Multiplex. As you say the data rate is slow so it is possible to have a good number of Txs sharing the same link and the short range limits that number to pretty much your own.
So you can monitor your buddy's tank? What's the max distance? I assume these things are using radio frequencies...no? Is this the same frequencies that are used to talk between full-face masks?
The radio frequency links work up to less than 2 metres as water is quite hard to send a signal through, and it's quite low power. For my Suunto it's 123 kHz, 360 mW. The new Garmin Descent adds a sonic link that is claimed to work up to 10m.
This doesn't answer your question but monitoring your buddy's tank shouldn't be a goal, unless you're an instructor. If there's frequent miscommunication or lack of communication that's definitely something your buddy and you should talk about in dive briefings since good procedures are better than tech.
@@Yggdrasil42 I like redundant backups.
What? Some divers dive WITHOUT!!! a J valve backup for their SPG, that is a backup for their AI !!??