Hi Jiang Wenyi.

Please double check that both UmTRX's runs with the same FPGA images (and firmware).
If absolutely the same then seems one board is broken.
Please double check itšalso by some other tests to be sure before send to us for repair.

Best regards,
Andrey Sviyazov.


2013/8/2 jiangwy <wyjiang@ljshuoda.com>
I try another UmTRX board, and it's OK. The difference from the channel 0 and 1 isšvery small.
š
jiangwy
š
Date:š2013-08-02š17:30
To:šwyjiang
CC:šUmTRX
Subject:šRe: Re: The Difference of Signal Strength From Two Channels on The Same Board is Big
Ok.
š
Alsošcheckšthatšašcorrectšinputšisšselectedšonšbothšchips
(--lms-get-rx-lnašoption).
š
Then,šcouldšyoušcheckšwhetheršthisšisšconsistentšamongšbothšUmTRXšyoušhave?
š
OnšFri,šAugš2,š2013šatš12:55šPM,šjiangwyš<wyjiang@ljshuoda.com>šwrote:
>šIšusešthešfollowingšcommand
>
>š./umtrx_lms.pyš--lmsš{1,2}š--lms-get-rx-vga2-gain
>
>šthešoutputsšarešallšthešsameš(š15š).
>
>š________________________________
>šjiangwy
>
>šFrom:šAlexanderšChemeris
>šDate:š2013-08-02š16:20
>šTo:šwyjiang
>šCC:šUmTRX
>šSubject:šRe:šThešDifferencešofšSignalšStrengthšFromšTwošChannelsšonšThešSame
>šBoardšisšBig
>šHišJiang,
>
>šArešyoušsurešyou'rešsettingšRxšgainšproperlyšforšbothšchannels?
>šIšrecommendšyouštošusešumtrx_lms.pyšscriptšfromšthisšrepositoryšto
>šcheckšRxšLNAšandšRxšVGAšsettingsšforšbothšLMSšchips:
>
>šOnšFri,šAugš2,š2013šatš12:09šPM,šjiangwyš<wyjiang@ljshuoda.com>šwrote:
>>šHišAlexanderšChemeris,
>>
>>šAccordingštošrx_multi_samplesš,šIšwritešašprogramštošreceivešsamplesšfrom
>>štwošchannelsšonšthešsamešboard.
>>šThešprogramšreceivešsamplesšfromš2šchannelsšandšcalculatešthešsignal
>>šstrengthšrespectively.šThešsignalšisšfromšašBTSšarround.
>>šIšfindšthešdifferencešofšsignalšstrengthšisšveryšbig,šaboutš20dB,šand
>>šchannelš1šisšbiggeršthanšchannelš0.
>>šIššexchangešthešantennašandšfeederšofšthešthem,šbutšthešresultšisšsame.
>>šIšthinkštherešisšsomešproblem,šbutšIšcann'tšfindšit.
>>šWouldšyoušpleasešgivešmešsomešsugguestion?
>>
>>šBestšRegards.
>>
>>š________________________________
>>šJiangšWenyi
>
>
>
>š--
>šRegards,
>šAlexanderšChemeris.
>šCEO,šFairwavesšLLCš/šďďďšőÍňÁÄÉĎ
>
š
š
š
--š
Regards,
AlexanderšChemeris.
CEO,šFairwavesšLLCš/šďďďšőÍňÁÄÉĎ
š