IWR6843AOP: FCC testing showing signal from 60-66GHz and an even stronger signal from 72-78GHz!!!

Lawrence Garber

Part Number: IWR6843AOP

Tool/software:

I'm getting my device (an IWR6843AOP connected to an ESP32-WROOM-DA) tested right now and we're seeing a stronger signal 12GHz higher than my mmWave device which is configured to emit 60.75GHz to 63.98GHz. Anyone seen this and/or have ideas on how to fix this?

3 months ago

0 Lawrence Garber 3 months ago

Prodigy 20 points

And yes, the primary sweep is 2 GHz wider than my config file specifies. I'm using the standard 3D People Tracker 6M Config file...

Is it possible that it's the testing center? They are using a scope that goes to 45GHz but then using some frequency multiplier to increase the range to 90GHz.

Another clue is that when I just set the frequency to 62GHz with 0 slope, I get signals at 62, 64.6, 74.1, and 77.3GHz

ADDENDUM: USER ERROR: Testing Site was mis-reading the scope. It was all artifact of the scope/receiver, not the sensor. PHEW! Sorry for the panic post...

0 Abhishek Karkisaval 3 months ago in reply to Lawrence Garber

TI__Expert 8990 points

Thanks for your query. Please allow us a couple of days to respond

Regards

0 Ankit Mohanty 3 months ago in reply to Lawrence Garber

TI__Expert 7720 points

Hi Lawrence,

Is the issue resolved. So, I may close this e2e request?

"ADDENDUM: USER ERROR: Testing Site was mis-reading the scope. It was all artifact of the scope/receiver, not the sensor. PHEW! Sorry for the panic post..."

Regards

Ankit

0 Lawrence Garber 3 months ago in reply to Ankit Mohanty

Prodigy 20 points

Yes, please close this e2e request. The testing equipment's down-frequency mixer was generating spurious signals at higher frequencies and the test engineer didn't realize that initially. He waited until after my heart attack to figure that out...

0 Ankit Mohanty 3 months ago in reply to Lawrence Garber

TI__Expert 7720 points

Hi Lawrence,

Thanks for the confirmation. I shall close this ticket for now. Please reach out in case of any further query.

Regards

Ankit

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IWR6843AOP: FCC testing showing signal from 60-66GHz and an even stronger signal from 72-78GHz!!!