Re: [Discuss-gnuradio] USRP1 question

[Marten Christophe]

Hi ,

If any one can tell me in USRP1 ver4.5, how many layer PCB used , i
examined it and it looks like it is double sided PCB,

or it has multiple layers,like 6 layers?
Thanks in advance for confirmation.

Kind Regards,


On 11/20/10, Marten Christophe <address@hidden> wrote:
> Hi ,
>
> If any one can tell me in USRP1 ver4.5, how many layer PCB used , i
> examined
> it and it looks like it is double sided PCB,
>
> or it has multiple layers,like 6 layers?
> Thanks in advance for confirmation.
>
> Kind Regards,
>
> On Fri, Nov 19, 2010 at 2:31 PM, Eric Blossom <address@hidden> wrote:
>
>> On Fri, Nov 19, 2010 at 05:17:53PM +0900, Songsong Gee wrote:
>> > I use USRP sink and source and set frequency with 2.6 GHz
>> > When I run a flow graph, I see like below:
>> > ==============================================
>> > A: Flex 2400 Tx MIMO B
>> >     r.baseband_frequency = 2604000000.0
>> >     r.dxc_frequency = -4000000.0
>> >     r.residual_frequency = 0.0
>> >     r.inverted = False
>> >
>> > A: Flex 2400 Rx MIMO B
>> >     r.baseband_frequency = 2596000000.0
>> >     r.dxc_frequency = -4000000.0
>> >     r.residual_frequency = 0.0
>> >     r.inverted = False
>> > ===============================================
>> > Both of baseband frequency are near 2.6 G, but they do not match up
>> > Can it be problmeatic for communicating each other?
>>
>> The actual frequencies on the air will be 2.6 G +/- oscillator tolerance.
>>
>> In the Tx case, the LO is set 4MHz higher than the target, and the
>> DUC is used to adjust the baseband -4MHz.
>>
>> In the Rx case the LO is set 4MHz lower than the target, and the DDC
>> is used to move the digitized IF signal 4MHz lower prior to decimating.
>>
>> This is easy to confirm with a siggen and a spectrum analyzer.
>>
>> Eric
>>
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>