Hi Jiang.

Please remember that Rx and Tx of LMS can't work well at the same frequency due to PLL's problems.
Also, please do not forget about TxLO leakage which is quite significant.

Best regards,
Andrey Sviyazov.
(Sent from my mobile client)

07.06.2013 14:36 ĐĎĚŘÚĎ×ÁÔĹĚŘ "jiangwy" <wyjiang@ljshuoda.com> ÎÁĐÉÓÁĚ:
OK.
Thank you and Sylvain very much!
š
jiangwy
š
Date:š2013-06-07š18:12
To:šwyjiang
CC:šUmTRX
Subject:šRe: Time to Switching Frequence
Jiang,
š
It'sšnotštested.šLMS6002Dšchipšbyšitselfšhasšquitešshortštuningštime,
butšthešcurrentšhostšandšFPGAšcodešintroducešsignificantšdelay.šI
can'tšfindšexactšnumbersšregardingšLMSštuningštime,šbutšIIRCšitšwas
shorteršthanšašGSMštimeslot.
š
So,šasšSylvainšsaid,šgivenšsoftwarešlimitationsšit'sšeasierštošuseštwo
channelsšofšUmTRXštošreceivešonštwošfrequencies.
š
OnšFri,šJunš7,š2013šatš11:21šAM,šjiangwyš<wyjiang@ljshuoda.com>šwrote:
>šHišAll,
>
>šIšhavešašprojectštošmonitoringš(šairšsnifferš)šthešdatašbetweenšGSMšBTSšand
>šMSšusingšUmTRX.
>šUplinkšTransmissionšisšdelayedš3šslotsšthanšdownlinkšfromšspecification.
>šSošwhenšIšsync.šwithšBTSšandšgetšthešdownlinkšslotšdata,šIšmustšswitchšthe
>šfreqsšofšreceiveršfromšdownlinkštošuplinkšinšlessšthanš2šslots.
>šWhenšthešprogramšcallš'usrp_dev->set_rx_freq(wFreq)',šHowšmuchštimešdoesšthe
>šUmTRXšswitchštoštheš'wFreq'š?
>
>šThanksšinšadvance.
>
>š________________________________
>šJiangšWenYi
š
š
š
--š
Regards,
AlexanderšChemeris.
CEO,šFairwavesšLLCš/šďďďšőÍňÁÄÉĎ
http://fairwaves.ru