LMS TxLO noise

Alexander Chemeris alexander.chemeris at gmail.com
Wed Jul 25 05:12:26 UTC 2012


Sorry, missed that! I was reading before I really wake up.

Still we need to document this at the issue tracker.

On Wed, Jul 25, 2012 at 9:01 AM, Andrey Sviyazov
<andrey.sviyazov at fairwaves.ru> wrote:
> Alexander, I already explained it in preview mail.
>
> Best regards,
> Andrey Sviyazov.
> (Sent from my mobile client)
>
> 25.07.2012 8:47 пользователь "Alexander Chemeris"
> <alexander.chemeris at gmail.com> написал:
>
>> Hi Andrey,
>>
>> Could you also describe to Thomas and Sylvain what to do with C45 and
>> L6? I guess that's a required step before they do any other
>> measurements.
>>
>> And please, add this issue to the issue tracker.
>>
>> On Wed, Jul 25, 2012 at 1:56 AM, Andrey Sviyazov
>> <andrey.sviyazov at fairwaves.ru> wrote:
>> > Hi Thomas.
>> >
>> > Could you please make test again for LO integral phase noise and
>> > modulation
>> > accuracy with PLL loop filter 100kHz and ICP=0.4mA (or above), as Srdjan
>> > suggested us.
>> > I've assembled 100kHz loop filter with the next components:
>> > C82 = 100pF, C83=1500pF, C84=33pF, R106=2.2k, R109=3.3k.
>> > To get good noises replace choke L6 by capacitor 10nF..22nF and remove
>> > C45.
>> >
>> > I ask you because I have to send final BOM as soon as possible to avoid
>> > delay of UmTRXv2 production due to changes for improvements.
>> >
>> > Best regards,
>> > Andrey Sviyazov.
>> > P.S. Pictures attached just to be sure.
>> >
>> >
>> > 2012/7/23 Andrey Sviyazov <andrey.sviyazov at fairwaves.ru>
>> >>
>> >>
>> >> > > Perhaps this is a silly question, but how do I calibrate the clock?
>> >> > > or
>> >> > > use an external reference signal?
>> >> >
>> >> > Andrey Sviyazov - does ClockIn works as external input in UmTRXv1?
>> >>
>> >> Yes, 5V cmos level required or smaller with DC offset to get 2.5V
>> >> symmetry.
>> >> Turn switches to MHz and slave positions.
>> >>
>> >> Best regards,
>> >> Andrey Sviyazov.
>> >> (Sent from my mobile client)
>> >
>> >
>>
>>
>>
>> --
>> Regards,
>> Alexander Chemeris.
>> CEO, Fairwaves LLC / ООО УмРадио
>> http://fairwaves.ru



-- 
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru




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