Recent content by njmorrell

  1. njmorrell

    Hello from Miami Beach!

    If you live in Miami beach try this. (127) Dive Miami - YouTube
  2. njmorrell

    Reading Wireless Air Transmitter using Arduino

    Did you ever figure out the type of modulation?
  3. njmorrell

    Reading Wireless Air Transmitter using Arduino

    OK, so I did a bit more research. The Pelagic Systems used by a lot of different computers - FCC ID MH8A operates at 38kHz modulation not stated. The latest Suunto 2014 - FCC ID RYP21162 operates at 123kHz with PSK modulation. I did my tests with an older Suunto which I think dated around...
  4. njmorrell

    Reading Wireless Air Transmitter using Arduino

    I guess they had some kind of identifier or maybe just signal strength. You had to hold the computer next to the transmitter to get it to start working (a bit like the early heart monitors from Polar), it was all a bit problematical because sometimes it would just refuse to work. The problem...
  5. njmorrell

    Reading Wireless Air Transmitter using Arduino

    Hi, I listened to the audio. I notice the period of the pulses did not change so I would guess the pressure is encoded in the signal together with the identity of the transmitter. I agree it will probably be FSK modulation. The transmitter I tested with, was an early one with no identity, it...
  6. njmorrell

    Reading Wireless Air Transmitter using Arduino

    Some years ago I was having a problem with my Suunto Vytec and transmitter so decide to investigate. I made a simple resonant circuit using a ferrite rod antenna from a wireless clock (one that picks up the LF signal with time information) with a two transistor amplifier. It worked very well...
  7. njmorrell

    Aqualung/US Divers Micra Exhaust cover available?

    Thanks for that. I contacted Aqualung and they still have some black exhaust covers so I ordered from them. I also contacted Genesis who replied they might have some if I sent a photo but it proved unnecessary. Nick.
  8. njmorrell

    Aqualung/US Divers Micra Exhaust cover available?

    Did you ever find one? I need two.
  9. njmorrell

    iPhone app display changed.

    Thanks for that, it looks obvious now but I had poked around all the various menus &c. and not found it.
  10. njmorrell

    iPhone app display changed.

    I don't use the phone app very much(I prefer the desktop) but the other day wanted to find a specific dive (I was not at home) and notice that somehow the display has changed. Instead of one line for each dive I now seem to have half a screen of information including the graph for each dive...
  11. njmorrell

    Siebe Gorman Mistral and Scubapro Pilot

    I did my first 200 dives with a Siebe Gorman Mistral in the 60's. It is a very simple single stage regulator. You can buy a set of BA (British Association) taps and dies on the Internet and make any screws you might need for restoration. Nick.
  12. njmorrell

    BSAC published new gas density recommendations

    Way back in May 2017 the BSAC recommended limiting gas density to 6.2gm/l and PN2 switches to 0.5-0.7 bar. Having looked at the recently published gas density tables it doesn't seem much has changed since May 2017.
  13. njmorrell

    Who actually manufactures SPGs?

    Pelagic make computers, they don't make analogue SPGs.
  14. njmorrell

    Who actually manufactures SPGs?

    I don't think Pelagic Pressure Systems are a manufacturer. Here is the Termo Industria line of SPGs. Termoindustria | Submersible Pressure Gauges | SPG You may recognize yours.
  15. njmorrell

    Who actually manufactures SPGs?

    It seems to me that Termo Industria in Italy just about manufactures every SPG on the planet. They make the gauges for all the major Scuba equipment brands. Does anyone know of another manufacturer? Nick.
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