How to syncronizing two UmTRXs

jiangwy wyjiang at
Wed Jul 24 05:30:08 UTC 2013

Hi Andrey Sviyazov,

I understand now. 
I have seen the code in UHDDevice.cpp as following:
const double master_clk_rt = 13e6;

So I have made a mistake.  


From: Andrey Sviyazov
Date: 2013-07-24 12:44
To: wyjiang
CC: umtrx
Subject: Re: Re: How to syncronizing two UmTRXs
Hi Jiang Wenyi.
System clock of UmTRX is 26 MHz.
And the same for synchronizing clock I/O.
Thereafter system clock devided by 2 in each UnTRX to get 13 MHz interleaved I/Q sample clock.
Best regards,
Andrey Sviyazov. 
(Sent from mobile)
24.07.2013 4:42 пользователь "jiangwy" <wyjiang at> написал:
> Andrey Sviyazov
> If I connect X7 between master and slave, then the clock of master is 13MHz and the clock of slave is 26MHz. Is that right?
> Best regards,
> Jiang Wenyi
> From: Andrey Sviyazov
> Date: 2013-07-23 22:59
> To: wyjiang
> Subject: Re: How to syncronizing two UmTRXs
> Hi Jiang Wenyi.
> To synchronize clock of several UmTRX you have to leave one of them in master mode, 
> but all others must be switched to slave mode.
> Master/slave control switch for 26MHz clock is S3(MHz).
> I/O connector for 26 MHz clock is X7.
> In case of master mode X7 becomes output and input in case of slave mode.
> To set master mode turn switch S3 to the downward and to upward for the slave mode.
> Please find text on the PCB board to be sure.
> BTW, if you would like to use external clock source then all of UmTRX's must be in slave mode, 
> i.e. their clock connectors must be inputs.
> Best regards,
> Andrey Sviyazov.
> 2013/7/23 jiangwy <wyjiang at>
>> Hi All,
>> I have two UmTRXs v2. How to make the clock of them syncronized?
>> ________________________________
>> Jiang Wenyi
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