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long range mode modulation

Posted: Mon Jan 24, 2022 7:55 pm
by romanlh
I connected simple power metter to ESP32 devkit and found that peak level in Long Range mode is twice smaller then in 802.11b mode.
Why? Does LR mode use multiple subcarriers and thus have to lower peak level? Any details on LR mode modulation?

Sensor: http://www.herbert-dingfelder.de/?page_id=68

802.11b mode:
AKIP0022.jpg
AKIP0022.jpg (74.48 KiB) Viewed 1803 times
LR mode:
AKIP0019.jpg
AKIP0019.jpg (77.83 KiB) Viewed 1803 times
(ignore smaller pulses, it is response from another module intentionally placed in proximity).