Alexander, I already explained it in preview mail.
Best regards,
Andrey Sviyazov.
(Sent from my mobile client)
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@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@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