UHF-RFID-UNIT-JRD-4035 effective distance

[PAOPAO]

Web page shows
"the transmission power of 100mW can reach the effective distance of more than 1.5M."

https://shop.m5stack.com/products/uhf-rfid-unit-jrd-4035?variant=39375750824108

But my JRD-4035 effective distance is 0.4M

If possible , could you let me know why JRD-4035 is low performance ?

[M5Stack_AG]

@PAOPAO Hi there! The required configuration is 920MHZ so the antenna can work the best

[PAOPAO]

@m5stack_ag san,
Thank you for your message!
Could you let me know how to set 920MHZ ?

By the way, Specification metal IC Tag of mine is "Up to 4.2M - (US) 902-928MHz, on metal"

[M5Stack_AG]

@paopao Hi! If using UIFlow, then this is it, if it‘s Arduino. Serial port sending commands
or use API， then CH_index = 1

https://github.com/m5stack/M5Stack/blob/master/examples/Unit/UHF_RFID_JRD4035/RFID_command.cpp