Hi Andrey.

š

I see. But what's the TxLO leakage?

š

---

jiangwy

š

From:šAndrey Sviyazov

Date:š2013-06-07š19:14

To:šwyjiang

CC:šumtrx; Chemeris Alexander

Subject:šRe: Re: Time to Switching Frequence

Hi Jiang.

Sorry, I missed that you'll use only receivers.
So, no any problems in this case.

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

07.06.2013 14:54 ĐĎĚŘÚĎ×ÁÔĹĚŘ "Andrey Sviyazov" <andreysviyaz@gmail.com> ÎÁĐÉÓÁĚ:

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

From:šAlexander Chemeris

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