ST87M01 WiFi Scan performance very weak compared to ESP32 (same antenna)

[GeoP]

Hi all,

I'm experiencing very poor WiFi scan sensitivity with the ST87M01 (FW 2.9.0) compared to an ESP32 using the exact same antenna (connected via U.FL). While the ESP32 easily finds multiple networks, the ST87M01 only sees very few, or none at all.

Device Info & Scan Config (ST87M01)

```text
ati
STMICROELECTRONICS
ST87M01-1301
A:2.9.0-M:2.9.0-S:2.9.0-G:2.9.0-B:1.1

AT#WSCAN=4,1      <-- [Config] RF Path (NB-IoT antenna path)
OK
AT#WSCAN=3,500   
OK
AT#WSCAN=5,3     
OK
AT#WSCAN=2,0     
OK
AT#WSCAN=1,1,6,11 <-- [Action] Trigger scan on channels 1, 6, 11
OK
...
#WSSTOP           <-- [Result] (Hardly any networks returned)
```

Reference: ESP32 Scan (Same Antenna, same spot)

```text
1: Yippie (BSSID: 3C:A6:2F:B5:E4:37, Kanal: 11, RSSI: -48 dBm)
2: RAK7268V2_BAD1 (BSSID: AC:1F:09:19:BA:D2, Kanal: 11, RSSI: -50 dBm)
3: Yippie (BSSID: D4:24:DD:4D:F2:2F, Kanal: 11, RSSI: -54 dBm)
4: Yippie (BSSID: DC:39:6F:1F:5C:03, Kanal: 11, RSSI: -76 dBm)
5: linksys (BSSID: 98:FC:11:CE:00:16, Kanal: 9, RSSI: -86 dBm)
6: Yippie (BSSID: D4:24:DD:4D:F4:90, Kanal: 11, RSSI: -86 dBm)
```

Questions:
Is there an issue?

Configurations in the ST87M01 AT commands I might have missed?

Any hints on what I might be doing wrong are highly appreciated!

Thanks, Jo

[Andrew Neil]

```text

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[Didier HERROUIN]

Dear GeoP,

Yes, there is an issue as your results are not inline with ST87M01 sensitivity.

Your settings and AT commands are correct.
Please enable URC mode by AT#WSCAN=2,1 to get a better view of the events and send back the logs.
You could also increase the scanning time : AT#WSCAN=3,1000

Which board do you use ?

• If you use the evaluation kit “EVKITST87M01-2”, please use the antenna provided in the box and compare with your actual results.
• If you use your own board, you should check the antenna path (do you use a 50ohms impedance track ?).
  Can you share the reference of the antenna you use ?

Best regards,