hoseless transmitter frequency

adjuster-jd · Apr 28, 2006

Can anyone tell me the frequency range used by hoseless computer transmitters? This is mainly a trivia issue.. I was speaking to a friend a couple days ago and since we are both ham radio operators he asked about my hoseless transmitter and what frequency it uses. I really had no idea. FWIW - I have an Aeris 750GT.

Thanks.

Mark Vlahos · Apr 29, 2006

I was told by the manufacturer of my hoseless dive computer that they do not use traditional "radio" waves. They use some sort of magnetic resonance technology. He told me that it transmits through water better than radio. In my case he said that water, divers, and much of our gear are transparent to the transmission, the only thing that will block it is metal, and he said that metal will block it completely. It is of a relatively low power so distance is a factor, but it is around 8 to 10 feet.

As for the Aeris, I don't know what technology they use.

Mark Vlahos

PaulChristenson · Apr 29, 2006

Mark Vlahos:
As for the Aeris, I don't know what technology they use.

Mark Vlahos

Whatever Aeris uses...if you have your computer on your wrist, you have to stop your DPV to get the screen to display the transmitted data...BTDT...

The new EPIC will read three different transmitters...

scubatoys · Apr 29, 2006

Yea, RF does not work underwater, and anything that causes a strong magnetic field can block the signal until the interference goes away... such as a scooter motor.

herman · Apr 29, 2006

I would suspect it is rf in the VLF range, 10-20khz. These frequencies penetrate water fairly well. The interference from a DPV is most likely RFI. VLF frequencies are pretty susceptible to noise.

Charlie99 · Apr 29, 2006

I don't have any direct knowledge, but have seen some stuff that indicated it is inductive coupling at a few hundred kHz. Similar to some of the RF ID tag or smart card technologies.

Maybe you can rig up a small coil, hook it up to a scope and report back.

djanni · Apr 29, 2006

Last night I watched Jean-Michel Cousteau's Ocean Adventures, Voyage to Kure.

One seqment was on testing new underwater communications equipment. Range was up to 200' deep. Didn't talk about the technology but the audio was pretty good. Probably had more than a 9volt battery driving it.

hoseless transmitter frequency

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