[USRP-users] frequency shift of B210

Marcus Müller marcus.mueller at ettus.com
Fri Jul 21 11:49:56 EDT 2017


Hi John,

the CC1120 is a cheap transceiver for GFSK. Unless you've driven it with
an oscillator that is way better than that of the B210, I don't really
see how your measurement could imply any clock drift on the B210's side?

Best regards,

Marcus


On 21.07.2017 10:41, john liu via USRP-users wrote:
> Hi,Marcus,
> We calculated this.
> The B210 not only generate a GFSK signal,but also received the signal
> from CC1120.The CC1120 and B210 both work in full duplex mode.
> Hi qi,
> Can you describe your test method?I am not clear for that.
>
> best regards
> John
>
>
> On Fri, Jul 21, 2017 at 10:47 AM, Marcus D. Leech <mleech at ripnet.com
> <mailto:mleech at ripnet.com>> wrote:
>
>     On 07/20/2017 10:08 PM, john liu wrote:
>>     i am sorry.
>>     We generate a GFSK signal with B210 and  received the signal with
>>     multiple cc1120.When frequency shift occurred,the cc1120 can
>>     not received the signal.
>>     Also, another b210 has been running for several days without such
>>     a jump phenomenon.
>     So, sorry to be a bother, but, where did the 3.2kHz frequency
>     shift measurement come from?   The CC1120 is just a GFSK
>     demodulating digital receiver.
>
>
>>
>>     On Fri, Jul 21, 2017 at 9:37 AM, Marcus D. Leech
>>     <mleech at ripnet.com <mailto:mleech at ripnet.com>> wrote:
>>
>>         No i mean what were you measuring?
>>
>>         Were you using an external signal generator and what were its
>>         specs?
>>
>>
>>         Sent from my iPhone
>>
>>         On Jul 20, 2017, at 9:09 PM, john liu
>>         <johncorad1988 at gmail.com <mailto:johncorad1988 at gmail.com>> wrote:
>>
>>>         HI Marcus,
>>>         internal with  TCXO.
>>>
>>>         On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech
>>>         <mleech at ripnet.com <mailto:mleech at ripnet.com>> wrote:
>>>
>>>             On 07/20/2017 02:22 AM, john liu wrote:
>>>>
>>>>
>>>>
>>>>             What was your tuned frequency in this case?
>>>>
>>>>             Hi,Marcus,
>>>>
>>>>             It is 433.05Mhz
>>>             That's about 7PPM.
>>>
>>>             What was your signal source?
>>>
>>>
>>>>
>>>>             On Thu, Jul 20, 2017 at 11:46 AM, john liu
>>>>             <johncorad1988 at gmail.com
>>>>             <mailto:johncorad1988 at gmail.com>> wrote:
>>>>
>>>>                 Hi all,
>>>>                 We used B210 with TCXO,and run about 2 hours , a
>>>>                 3.2K frequency shift occurred when the temperature
>>>>                 did not change significantly.Is it a normal?
>>>>                 How can we improve this situation?
>>>>
>>>>                 thank you.
>>>>                 best regards
>>>>                 John
>>>>
>>>>
>>>
>>>
>>
>
>
>
>
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