Hallo,
Apologies for reviving a very old post, but I faced an interestingly-enough behaviour the community may benefit from hearing about.
TLDR:
Using Lime SDR Mini V2 with USB 2.0 ports replicate the behaviour of TX_2 LNA_W test failing, i.e. connection to USB 3.0 makes it pass.
More info:
In all cases I was using LimeSuite Rel 23.10.0
On a laptop running Ubuntu 20 (64bit ofc, Toshiba something, USB PORT 3.0) and the LimeSDR Mini v2 connected to two “normal” GSM/WCDMA/LTE omni antennas w/ magnetic mount:
Board tests pass O.K. (in particular TX_2 LNA_W passes)
Nevertheless, connected to a USB 2.0 Female adapter that splits in Y into two USB 3.0 Male terminals, one of them connected to a power source, the other one to a 3.0 USB Female port in a Raspberry pi 4B that uses the same LimeSuite version (23.10.0), the TX_2 LNA_W Test fails, but the rest of them pass.
Naturally the last test to share is the case where, albeit Lime SDR Mini v2 will/may have less power available, it’s directly connected to the Raspberry Pi 4B USB 3.0 Female port.
In this case tests are passed.
Thanks!