[PSUBS-MAILIST] Adding an OTS surface unit inside sub

[Sean T. Stevenson via Personal_Submersibles]

The headsets are definitely better than the panel speaker, and should probably be used even with the STX-101. I have the same issue with my MK2-DCI. The speaker is really just intended to provide situational awareness to other people in the vicinity by allowing them to listen in. It gets even worse from a diver tending perspective if you have to deal with helium voice without a descrambler. When used as designed as a surface unit, the primary tender / surface coordinator should be on a headset plugged in to the box. A large part of that is the exclusion of ambient noise (wind, voices, engine, etc.) that the headset provides, lowering the noise floor to increase intelligibility. Another big contributor to intelligibility is simply knowing how to speak on comms, in resisting the urge to talk in a normal flowing voice in favor of somewhat awkwardly separating and enunciating your words.

Earbuds / indoor lightweight headset is probably not ideal for the surface, but may work just fine in the sub, because there isn't much in the way of ambient noise inside. I do wonder about matching the impedances of the OTS headset / microphone with a small headset in its place though. I have never actually measured what these are on the OTS headset. Typical earbuds as you might have with your phone are usually 8, 16 or 32 ohm. My studio headphones are 54 ohm. No idea about microphones. Probably okay as long as you have bidirectional volume controls, but you'll have to experiment.

Sean

-------- Original Message --------
On Nov. 10, 2020, 18:59, Jon Wallace via Personal_Submersibles < personal_submersibles at psubs.org> wrote:
Yeah, I don't know...I can only say that my personal experience is that the clarity of SSB-2010 with headset is superior to the STX-101 speaker. I think part of that reason is because the STX-101 has a plastic/cellophane cover over the speaker to protect it from water splashes which adds a layer of timber distortion on top of that already inherent with side band comms. Add the hollow echo you get from being surrounded by steel and I'm not sure how clear it's going to be. Time will tell. I'm using the STX inside the sub as well, but for different reasons. Planning on bringing a headset just in case, but not the heavy kind OTS issues with their gear. I wonder how earbuds would do.

Jon

On Tuesday, November 10, 2020, 08:06:55 PM EST, Brian Hughes via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Jon,

Switch has 8 channels and OTS 1 is actually channel 3 on the dial so that tells me the first two are something else - what I have no idea. My main attraction is not having to wear a headset.

Brian

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