# Dead USB

**URL:** <https://discourse.myriadrf.org/t/dead-usb/6909>\
**Category:** LimeSDR\
**Created:** [31 January 2021 22:50 UTC](https://discourse.myriadrf.org/t/dead-usb/6909 "2021-01-31T22:50:38Z")\
**Posts on this page:** 1\
**Showing post:** 16

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**Author:** ![mzs](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/mzs/32/2678_2.png) [@mzs](https://discourse.myriadrf.org/u/mzs)\
**Post date:** [25 April 2021 13:48 UTC](https://discourse.myriadrf.org/t/dead-usb/6909/16 "2021-04-25T13:48:21Z")

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> [@9H1LO](#):
>
> CH0 (SXR=1000.0MHz, SXT=1005.0MHz): Result:(-20.0 dBFS, 5.00 MHz) - PASSED  
> -\>Run Tests (TX\_1 → LNA\_H):  
> CH0 (SXR=2100.0MHz, SXT=2105.0MHz): Result:(-20.8 dBFS, 5.00 MHz) - FAILED  
> -\>RF Loopback Test FAILED

The pass makes sense, but the fail does not ([to me, anyhow](https://discourse.myriadrf.org/t/lime-usb-failed-loopback-test/6996/2)), I do not know enough. In fact why 2100.0MHz failed the first time made sense to me, but why 1000.0MHz failed the first time did not. You need someone who knows more to chime in.

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