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Transmitters on Short Hoses?

Discussion in 'Sidemount Diving' started by bradymsu, Apr 13, 2021.

  1. broncobowsher

    broncobowsher Solo Diver

    You replied between when I typed and when the post actually posted.
    mcohen1021 likes this.
  2. DogDiver

    DogDiver Contributor

    # of Dives: 5,000 - ∞
    Location: Branford, Florida
    You will want both a transmitter and SPG 029C8FA3-C5BA-4882-8C3E-48CA217BDAE8.jpeg
    Paul M and BrackaFish like this.
  3. tursiops

    tursiops Marine Scientist and Master Instructor ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: U.S. East Coast
    I understand why you might want an SPG, but why would you want to place it so it interferes with the tank valve in case you have to feather the tank?
    Scuba Client, Raphus and JBFG like this.
  4. ToneNQ

    ToneNQ ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Australia
    Mine are straight into the bottom HP port. I have an SPG in my bag for a save a dive kit but that is it. Had both fitted for maybe 200 dives, never looked at the SPG.
    JBFG likes this.
  5. bradymsu

    bradymsu ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Grand Rapids, Michigan, USA
    This seems to be the majority opinion that I'm getting from a variety of sources: For sidemount, the transmitters go directly into the bottom HP port provided they don't stick out too far or the tank doesn't prevent it. Otherwise, they should go on a 9" (23cm) hose and stored under the top tank band. A 6" (15cm) hose usually isn't long enough.

    Lots of debate on the issue of SPGs as a redundancy to transmitters likely from the days when transmitters weren't as dependable. Conventional wisdom today seems to be to ditch the SPGs if using transmitters.
  6. Mike1967

    Mike1967 Contributor

    # of Dives: 100 - 199
    Location: Victoria, Australia
    This ^^
    bradymsu likes this.
  7. JimBlay

    JimBlay Divin' Papaw ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: South Florida
    I wouldn't exactly call it conventional wisdom. Yes, many do ditch the SPG. However, many also choose to keep the SPG as a backup. Rather than call it conventional wisdom I would say that it is an acceptable practice in recreational diving to ditch the SPG and only dive with the transmitter for pressure. It is also equally accepted to dive with a backup SPG.

    If you are doing any technical diving with your sidemount kit you will want backup SPGs. That's in line with the long held "2 is 1 and 1 is none" philosophy in technical diving.
    Paul M likes this.
  8. Kofferfisch

    Kofferfisch Registered

    # of Dives: 100 - 199
    Location: Germany
    I discovered this configuration a while ago on the board and have been diving this for a few dives and I am actually quite happy with it.
    Lostdiver71, Jafo19D and Paul M like this.
  9. grantctobin

    grantctobin ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: Chicago
    Did you run 2 SPGs on your backgas or on each of your stage/deco/SM bottles while you were technical diving?
    Tracy, rjack321 and RayfromTX like this.
  10. JimBlay

    JimBlay Divin' Papaw ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: South Florida
    That's a silly question and you know it. Of course I didn't. An SPG failure is far less likely than a transmitter failure. Transmitters are definitely more reliable than they used to be. I've never lost connection to my Perdix AI. However, you are still dependent upon one electronic device with one battery ... the transmitter. That is a single failure point with a failure potential high enough that it warrants redundancy. However, that is just my opinion. Dive however you wish to dive.
    lostsheep and mcohen1021 like this.

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