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Caves and transmitters.

Discussion in 'Cave Diving' started by blac86, Jul 17, 2017.

  1. tbone1004

    tbone1004 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
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    why?
     
  2. Capt Jim Wyatt

    Capt Jim Wyatt Hanging at the 10 Foot Stop Staff Member

    # of Dives: 5,000 - ∞
    Location: Key Largo
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    In the event the xmitter fails. The diver can and will still have an accurate readout of tank pressure.
     
  3. tbone1004

    tbone1004 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
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    why is that necessary except in the event of a mission critical dive that HAS to be completed? if the xmitter fails, turn the dive. On exit, you either have enough gas to get out, or you don't, knowing how much you have shouldn't make a difference to your exit strategy
     
    CodeS likes this.
  4. Capt Jim Wyatt

    Capt Jim Wyatt Hanging at the 10 Foot Stop Staff Member

    # of Dives: 5,000 - ∞
    Location: Key Largo
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    If the xmitter battery fails early in the dive, and you have an spg there is no need to abort the dive. The same way if I carry two primary lights and one fails I do not have to abort.

    If you have no spg and xmitter battery fails at max penetration- you have a long way to travel while assuming or guessing at your tank pressure. Psychologically speaking this will be stressful to some cave divers.

    Information is power.
     
  5. tbone1004

    tbone1004 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
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    fair enough, though I would argue that was inadequate predive checks from the divers for their xmitter battery status. Granted that implies that cave divers do adequate predive checks on OC which we all know as a rule doesn't happen.

    I'll stick to one pressure measuring device, but I also know that I have conservative dive planning and in the event of a xmitter failure, say in sidemount, I'll just stay on that bottle until I can feel a buoyancy difference, switch to the other side, and when they feel unbalanced in the other direction I'll know that the "dead" side has more gas than whatever is in the "alive" side. Even then, I have enough gas, or I don't. If I don't, that's what my buddy is for, but if I don't, then I seriously f*cked up my gas planning
     
  6. Capt Jim Wyatt

    Capt Jim Wyatt Hanging at the 10 Foot Stop Staff Member

    # of Dives: 5,000 - ∞
    Location: Key Largo
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    I agree with all that @tbone1004

    One spg for me on bm doubles, never owned an xmitter.
     
    RayfromTX likes this.
  7. tbone1004

    tbone1004 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
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    I won't for a few more years. I can see lots of practical applications for them though.

    I dive indy doubles quite a bit, would be nice to have a Perdix with a transmitter on each post for that instead of running a pair of spg's. Would leave it on for manifolded doubles because I'm lazy and use the same regs

    Obviously great in sidemount, but not great enough to spend $1400 on. If I didn't have a Petrel already I would seriously consider jumping in though.

    Great on a CCR as well to get rid of the O2/dil bottle SPG's and some manufacturers are putting HP ports in the head so you have wired AI for those bottles which I think is a great solution and I think Becky is still using a Perdix with AI for hers.

    Is it worth $1400 to me? Not right now, but if I was weighing $900 for a Perdix vs $1400 with 2 transmitters, I honestly would more than likely bite the bullet and do it.
     
    RayfromTX and Capt Jim Wyatt like this.
  8. Capt Jim Wyatt

    Capt Jim Wyatt Hanging at the 10 Foot Stop Staff Member

    # of Dives: 5,000 - ∞
    Location: Key Largo
    2,298
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    Ditto..me too.
     
    RayfromTX likes this.
  9. decompression

    decompression Instructor...seriously...

    # of Dives: 5,000 - ∞
    Location: Victoria, BC, Canada
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    I admit I am open to it now thanks to Shearwater and it seems to have Jim's blessing............still tough to swallow $17,000 for a Perdix AI and transmitters (Us dollar converted to Canadian dollars....lol)
     
    RainPilot likes this.
  10. tbone1004

    tbone1004 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    15,738
    7,074
    113
    you missed a couple 0's there
     
    RainPilot and Capt Jim Wyatt like this.

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