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StillTrying:

--- Quote from: Fungus on March 12, 2019, 12:47:06 pm ---a) Why would it take 30 seconds to warm up?
--- End quote ---

I don't know, I'd guess with the power they're putting into the TX transducers their peak frequency changes a bit in the first few minutes of on, which probably then is not a very good match for the cold RXs. :horse:
EEVblog:

--- Quote from: PaulReynolds on March 12, 2019, 07:36:05 am ---There are so many unknowns now in what they are doing, and inconsistent reported statements from them, it's getting hard, even for me, to make good estimates as to power levels, however I'll return to the point I made earlier that I had assumed that the LED detector panel was not 'self powered' and instead had batteries to amplify any incoming signal.

--- End quote ---

I have no doubt it's self powered, LED's a pretty darn efficient and even 100mW total would power those LED's.
Probably a sum of all the RX transducer for system power, then tap off individual transducer levels as well for individual mapping. Pretty easy dumb stuff.
sdpkom:

--- Quote from: Fungus on March 12, 2019, 12:47:06 pm ---
Questions:
a) Why would it take 30 seconds to warm up?

--- End quote ---

Quite normal.

For starters, there must be some  "computer" of some sort to manage it all, and it should finish booting up....
components need to reach operating temperatures.
It also verifies there are no engineers in the audience, if there are any, it warns the operator.

jrs45:
I doubt it's even as complex as needing "system power".  Each receiver transducer would just have a little conversion circuit that drives the LED.  If even that - I wouldn't be surprised if each transducer was connected directly to its own LED.
EEVblog:

--- Quote from: sdpkom on March 12, 2019, 02:17:16 pm ---
--- Quote from: Fungus on March 12, 2019, 12:47:06 pm ---Questions:
a) Why would it take 30 seconds to warm up?

--- End quote ---
Quite normal.
For starters, there must be some  "computer" of some sort to manage it all, and it should finish booting up....
components need to reach operating temperatures.
It also verifies there are no engineers in the audience, if there are any, it warns the operator.

--- End quote ---

*snort*
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