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Chapter 5. Hardware related
5.4.2 What are the modulation methods supported by ESP chips?
• ESP8266 supports BPSK/QPSK/16QAM/64QAM/DBPSK/DQPSK/CCK.
• ESP32 supports BPSK/QPSK/16QAM/64QAM/DBPSK/DQPSK/CCK/GFSK Π/4-DQPSK 8-DPSK.
• ESP32-S2 supports BPSK/QPSK/16QAM/64QAM/DBPSK/DQPSK/CCK.
• ESP32-C3 supports BPSK/QPSK/16QAM/64QAM/DBPSK/DQPSK/CCK/GFSK.
• ESP32-S3 supports BPSK/QPSK/16QAM/64QAM/DBPSK/DQPSK/CCK/GFSK.
5.4.3 How can I get the RF related information (e.g., antenna specification, antenna pat-
tern, etc.) for certification?
For such information, please contact
5.4.4 Why does ESP32 automatically reduce its transmit power when it uses the RF Test
Tool at 80 °C?
• Temperature compensation is disabled by default when ESP32 runs the fixed frequency firmware. There-
fore, the power reduces at a high temperature. To enable temperature compensation, please send tx-
pwr_track_en 1 1 0 to ESP32 through the default log serial port.
5.4.5 How to improve the receiving distance and strength of Wi-Fi signals for ESP32-
WROVER-E? (Application scenario: Wi-Fi probe)
• In terms of software, you can either set the maximum transmit power by API esp_wifi_set_max_tx_power(),
or set that via menuconfig: Component config > PHY > Max Wi-Fi TX power(dBm). The default
maximum transmit power is 20 dBm.
• If the transmit power has been set to the maximum value, you may improve the efficiency of the antenna and
receiving devices as follows:
– Adjust the module direction so that the stronger radiation direction of the antenna points to the receiving
device, realizing the farthest radiation distance.
– Make sure there is no metal or blocking object near the antenna of the module, no PCB on the back of
the antenna, and the Wi-Fi signal is not interfered by other signals of the end device.
– Use the IE series module with an antenna connector if the performance of the PCB antenna cannot meet
requirements, so that an external antenna with higher directional gain can be connected.
– Increase the radiation efficiency of the antenna in the receiving device.
5.4.6 How to write phy_init data to flash ?
:CHIP: ESP32 :
• You can write it via the power limit tool. Please download the
package, open the EspRFTestTool_vx.x_Manual.exe file, and then go to help > Tool help >
PowerLimitTool help for detailed operations.
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