NCS - Very short range even with Coded PHY

[GiulianoFranchetto]

Hi,

We are currently trying the Long Range (Coded PHY) on our advertised message, but we can't see any improvement (range of about 50meters). The range can even be smaller while using Coded PHY, which seems odd. 

We are using NCS and Zephyr and not the SoftDevice.

The configuration of the advertiser is

CONFIG_BT=y
CONFIG_BT_SMP=y
CONFIG_BT_SIGNING=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_ATT_PREPARE_COUNT=2
CONFIG_BT_PRIVACY=y
CONFIG_BT_BROADCASTER=y
CONFIG_BT_CTLR_TX_PWR_PLUS_8=y
CONFIG_BT_EXT_ADV=y
CONFIG_BT_EXT_ADV_LEGACY_SUPPORT=y
CONFIG_BT_KEYS_OVERWRITE_OLDEST=y
CONFIG_BT_EXT_ADV_MAX_ADV_SET=3
CONFIG_BT_LL_NRFXLIB=y

The advertiser parameters are:

 

BT_LE_ADV_PARAM(
		BT_LE_ADV_OPT_EXT_ADV | BT_LE_ADV_OPT_CODED,
		BT_GAP_ADV_FAST_INT_MIN_2 * 2,
		BT_GAP_ADV_FAST_INT_MAX_2 * 2, NULL)

The scanner scans the packet with the correct PHY:

[DEVICE]: 54:7c:02:d1:fc:a8 (random),
RSSI -47
Prim: LE Coded,
Secn: LE Coded

What could explain having such small range? What configuration can I set to increase the range?

Regards

Giuliano

[run_ar]

Hi,

What is the length of your advertisement package? and what kind of environment are you testing in?

[GiulianoFranchetto]

Hi,

The advertised packet has 15 bytes. We are testing outside, with some cars around. 

But 50m seems very very small for coded phy.

Regards

Giuliano