On 09/05/2020 13:29, DL1MHJ wrote:
Hi Joe, hi developers,
First of all, thank you so much for your nice work and the time you are
spending for developing
WSJT. I am happy to use mostly FT8 on short wave.
I am sorry, I haven't found a better list where I can reach you, I am hoping
it's OK for you.
I've read some issues about the open source project developing a decentralized
tracking App for
Covid-19 based on radio beacons via Bluetooth (https://github.com/DP-3T).
Bluetooth signals might
get overlapped und undetectable with a lot of persons nearby, e.g,. in a big
room, public transport.
So I remembered your nice and robust solution to use a frequency passband
channel more effectively
for many stations for FT4 etc.
Do you think that one of the faster modes, e.g., JT9H could help for this
development?
Could you read this issue on their project page, please: 'How to protect
against overlapping
signals? (https://github.com/DP-3T/documents/issues/245)
Is this something that you could think to support with your great knowledge and
solutions you have
developed for us hams?
Thank you so much es vy 73
Torsten, DL1MHJ
Hi Torsten,
as far as I know the Bluetooth Low Energy (BLE) and Bluetooth facilities
on smartphone and other devices only expose a high level API that allows
identification and message passing. I don't think there is any access to
the lower level layers, and certainly not to the physical layer where
modulation is applied to the radio.
I believe Bluetooth and BLE use a frequency hopping scheme to avoid
collisions within the mode's 2.4 GHz channels, that would also be
implemented in layers of the protocol well below the API accessible to
applications.
73
Bill
G4WJS.
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