Re: [Discuss-gnuradio] USRP1 XCV2450 LO - can it be bypassed with the motherboard's LO

[Nick Iliev]

Thanks for the clarification.   We have both XCVR2450 TX boards (in
the same TX USRP1 )  locked to 2.4GHz ( verified with a specturm
analyzer  ) . Now, the receiver XCVR2450 RX board (in the RX USRP1 )
should be able to lock to 2.4GHz as well , right ?

We're using  default  BPSK mod/demod  for this 2 TX x 1 RX experiment.
Both TX boards send BPSK  symbols in the same time slot,  and are
tuned for  2.4GHz   Is there a lock-detect pin on the RX side we can
probe to verify that the RX board has locked to 2.4GHz ?

-Nick

On Fri, Jun 8, 2012 at 7:34 PM, Matt Ettus <address@hidden> wrote:
>
> Each XCVR2450 is already locked to the motherboard crystal.  But "bypass it
> with the motherboard's
> X-TAL source" does not make sense.  The LO is generated by locking to the
> motherboard crystal source.  No bypassing is necessary.
>
> Matt
>
> On Fri, Jun 8, 2012 at 2:12 PM, Nick Iliev <address@hidden> wrote:
>>
>> Hello,
>>
>>  we have a USRP1 with 2 XCVR2450 daughtercards. Each XCVR2450 has its
>> own LO however , we would like to bypass it with the motherboard's
>> X-TAL source.
>> Both XCVR2450 daughtercards will then be driven synchronously by the
>> motherboard.
>>
>> Is this possible ?   If so, is there a schematic of the XCVR2450 and
>> motherboard which will show the required jumpers and/or SMTs ?
>>
>> If not, which USRP (2 ? ) and daughtercards do we  need ?
>>
>> Thank you,
>> Nick and Han
>> UIC wireless lab
>>
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>
>