[USRP-users] Different gain traces at RX interfaces

Marcus D. Leech patchvonbraun at gmail.com
Wed Jul 22 13:07:25 EDT 2020


On 07/22/2020 04:37 AM, Arash Jafari via USRP-users wrote:
> Hello All,
>
> My instrument (USRP X310) has 2 equivalent UBX-160 daughter boards.
>
>
> *|   |   |       RX Dboard: A
> |   |   |   ID: UBX-160 v2 (0x007e)
> |   |   |   Serial: 31D5AC*
> *
> *
> * RX Dboard: B
> |   |   |   ID: UBX-160 v2 (0x007e)
> |   |   |   Serial: 31D5B02*
> *
> *
> I applied an equivalent external stimulus at both RX interfaces.
> but the same stimulus signal at RX1 and RX2 interfaces  results in an 
> 18 dB difference in relative gain trace!!!!!!
> In attachment please find the relative gain trace.
> Does anybody know what is wrong with the board?
> Thank you in advance!
> *
> *
> *
> *
> -- 
> Dipl.-Ing. Arash Jafari
>
> Phone: +43 650 844 3617
> E-mail: arash.jafari.telecom at gmail.com 
> <mailto:arash.jafari.telecom at gmail.com>
>
How are these interfaces being driven?  Hard-wired?  Antenna?   What is 
the magnitude of the stimulus signal?

Are you sure you are plugged in to the right connectors on the front 
panel?   Is the gain being set to the same thing on both interfaces?


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