which TX Power value is maximum ?

RE: which TX Power value is maximum ?

ketiljo — Wed, 20 Apr 2022 07:15:50 GMT

It might be the example you are using that causes this. Try one of the examples here instead: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/samples/bluetooth/bluetooth.html

RE: which TX Power value is maximum ?

yoyou — Sat, 09 Apr 2022 00:44:27 GMT

Hi,

thanks for reply,

for nRF21540DK

nrf21540dk_nrf52840.conf

CONFIG_BT_CTLR_ADV_EXT=y
CONFIG_BT_CTLR_ADV_PERIODIC=y
# CONFIG_BT_LL_SW_SPLIT=y
# CONFIG_BT_CTLR_PHY_CODED=y
#CONFIG_BT_USER_PHY_UPDATE=y


# ------------FEM-------------------------------
CONFIG_MPSL_FEM=y
CONFIG_BT_CTLR_ADVANCED_FEATURES=y
CONFIG_BT_CTLR_TX_PWR_MINUS_20=y
CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=n
CONFIG_MPSL_FEM_NRF21540_RX_GAIN_DB=0
CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB=20

prj.conf

CONFIG_I2S=y
CONFIG_LOG=y
CONFIG_I2S_LOG_LEVEL_DBG=y
CONFIG_I2S_LOG_LEVEL_INF=y

CONFIG_BT=y
CONFIG_BT_EXT_ADV=y
CONFIG_BT_PER_ADV=y
CONFIG_BT_DEBUG_LOG=y
CONFIG_BT_DEVICE_NAME="PerAdv"

CONFIG_NEWLIB_LIBC=y
# CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y

CONFIG_HEAP_MEM_POOL_SIZE=8192
CONFIG_MAIN_STACK_SIZE=8192

CONFIG_GPIO=y

# CONFIG_BT_LL_SW_SPLIT=y
# CONFIG_BT_USER_PHY_UPDATE=y


# Allow for large Bluetooth data packets.
# Increase maximum data length of PDU supported in the Controller
CONFIG_BT_L2CAP_TX_MTU=252
CONFIG_BT_CTLR_ADV_DATA_LEN_MAX=244
CONFIG_BT_CTLR_DATA_LENGTH_MAX=251
CONFIG_BT_BUF_ACL_TX_SIZE=251
CONFIG_BT_BUF_ACL_RX_SIZE=502

i want to set maximum statically only. TX Power and GAIN

is the PA correctly?

and nRF21540DK without external antenna the distance can large than 200M？

Best Regards

RE: which TX Power value is maximum ?

ketiljo — Fri, 08 Apr 2022 11:57:16 GMT

nRF5340 doesn't have 8 dBm, that's correct. Max ix 3 dBm for this.

The range you measure seems very short. Have you configured the PA correctly? 50 m is much shorter than what you will see with only 8 dBm

BTW, make sure you can actually use more than 10 dBm where you intend to use this device. BLE is usually max 10 dBm.

RE: which TX Power value is maximum ?

yoyou — Fri, 08 Apr 2022 02:49:14 GMT

Hi,

distance difference :

RADIO_TXPOWER_TXPOWER_0dBm 30M

RADIO_TXPOWER_TXPOWER_Pos8dBm 50M

another,why 5340 and 52840 define difference ?

5340 don't have [+8 dBm]

i only want to furthest distance,

5340DK / 52840DK / 21540DK,

What is their maximum power option?

thanks

Best Regards

RE: which TX Power value is maximum ?

ketiljo — Thu, 07 Apr 2022 13:37:26 GMT

What difference in range do you see between 0 dBm and 8 dBm?

RE: which TX Power value is maximum ?

yoyou — Thu, 07 Apr 2022 09:08:03 GMT

Hi,

nRF21540DK

with periodic_adv project, your means ?

set_tx_power(BT_HCI_VS_LL_HANDLE_TYPE_ADV, 0, RADIO_TXPOWER_TXPOWER_0dBm);

but i test RADIO_TXPOWER_TXPOWER_Pos8dBm is maximum distance.

thanks

Best Regards

RE: which TX Power value is maximum ?

ketiljo — Thu, 07 Apr 2022 07:31:31 GMT

The nRF21549 have 20 dB gain, so you will have max output power when the input power is 0 dBm.