Re: [Discuss-gnuradio] 64MHz USRP Oscillator

[Wireless Monster]

Thanks everyone for your answer!

I understand that some frequency offset will always be there on the Rx
but I would like to minimize it.

However, the main problem on my system is on the Tx path as the
receiver (which I can not modify) is not having any frequency
correction algorithm, so I must Tx as close as possible to the
"expected" frequency.

Rgds,


On Wed, Jul 23, 2008 at 7:34 PM, Konstantin Tarasov
<address@hidden> wrote:
> You still have to remove frequency offset later on in your processing
> however.
>
> Konstantin
>
> On Wed, Jul 23, 2008 at 4:26 PM, Konstantin Tarasov
> <address@hidden> wrote:
>>
>> May be you can try FOX924, you can find this oscillator on
>> www.digikey.com. It has 2.5ppm freq. stability, has a 3.3V CMOS output and
>> the pinout is almost the same except one pin which is NC on this chip (# 1).
>> The package is a little smaller but I am sure you can work it in there. You
>> would also have to change settings on the PLL chip since highest frequencey
>> of the FOX924 is 27MHz. It is only 9 bucks (if you get one of) and Digikey
>> is a very fast supplier.
>>
>> Konstantin
>>
>> On Wed, Jul 23, 2008 at 4:06 PM, Brian Padalino <address@hidden>
>> wrote:
>>>
>>> On Wed, Jul 23, 2008 at 5:30 PM, Wireless Monster
>>> <address@hidden> wrote:
>>> > Hi All,
>>> >
>>> > I am having lots of issues with the USRP  64MHz (20ppm) on board
>>> > oscillator
>>> > which does not allow me to get exact and constant RF frequencies out of
>>> > the
>>> > RFX900 board. I can not really fix that in SW so I was thinking about
>>> > replacing the 64MHz crystal with a more precise one. Has anybody a
>>> > suggestion of which part to use?
>>>
>>> These guys seem to make a whole slew of TCXO's:
>>>
>>>    http://www.rakon.com/
>>>
>>> Maybe they'll be interested in supplying you with some more precise
>>> crystals?
>>>
>>> Brian
>>>
>>>
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>>
>
>