Sub GHz and Bluetooth ( nRF905 and nRF51822 ) = ShockBurst?

[westhouse]

Hi,

Is it possible to connect nRF905 to nRF51822 via SPI, add ShockBurst code nRF51822 and then use alternately/simultaneously Sub GHz and Bluetooth communication? I'm making an underwater wireless sensor network and 2,4GHz can't go through even a little amount of water. I will use nRF905 for short distances, just a few meters underwater. In S110 version 8, the CPU and BLE can work together simultaneously - is it then possible in this configuration that Sub GHz and BLE also can work simultaneously?

Thanks

[RicFlair]

Has a Solution to this been provided?

[AmbystomaLabs]

You will need to run at very, very low frequencies.  The 41MHz band might be a good choice. It is very narrow, so you won't have very high data rates.  

Even then you will need a pretty big link budget to even transmit a couple of meters.  Water is really, really lossy.

Someone else had a question on this a while back.

Here is the link: https://devzone.nordicsemi.com/f/nordic-q-a/28230/btle-beacon-strength/111492#111492