You don’t need an octoclock, but you DO need an external 10Mhz clock of some 
sort. 

Because two oscillators free running won’t maintain any kind of phase alignment 
for more than a few cycles. So they need to be phase locked to a common clock. 

Sent from my iPhone

> On Jan 20, 2020, at 3:05 AM, Sourin Mondal (Vehere) via USRP-users 
> <usrp-users@lists.ettus.com> wrote:
> 
> 
> Following link (fig. 2) shows the cris-cross connections inside USRP to 
> synchronize (phase align) 4 channels of the USRP. 
> 
> https://kb.ettus.com/Direction_Finding_with_the_USRP%E2%84%A2_X-Series_and_TwinRX%E2%84%A2
> 
> If I want to synchronize (phase align) all channels of two USRPs, is there 
> any solution for the synchronization without using Octoclock-G method ?
> 
> Regards,
> Sourin
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> USRP-users@lists.ettus.com
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