Proxmark 3 Easy : LF Antenna is unusable

[Blok62]

Hello,

I have Proxmark3 Easy.
When I execute hw tune, I have LF Antenna is unusable.
Can you help me on this subject ?

Thanks

Please find below the details

[ Proxmark3 RFID instrument ]

MCU....... AT91SAM7S512 Rev B
Memory.... 512 Kb ( 53% used )

Client.... Iceman/master/v4.14831-414-g1818fc6b5 2022-03-07 10:26:02
Bootrom... Iceman/master/v4.14831-414-g1818fc6b5 2022-03-07 10:25:49
OS........ Iceman/master/v4.14831-414-g1818fc6b5 2022-03-07 10:25:56
Target.... PM3 GENERIC

[!!] No history will be recorded
[usb] pm3 --> hw tune
[=] ---------- Reminder ------------------------
[=] hw tune doesn't actively tune your antennas,
[=] it's only informative.
[=] Measuring antenna characteristics, please wait...
[-] 9
[=] ---------- LF Antenna ----------
[!] LF antenna is UNUSABLE
[=] ---------- HF Antenna ----------
[+] HF antenna: 32.27 V - 13.56 MHz
[+] Approx. Q factor (*): 9.4 by peak voltage measurement
[+] HF antenna is OK