Re: Improving LMS6002 phase noise

On Tue, Jul 24, 2012 at 12:25 AM, Alexander Chemeris Alexander.Chemeris@fairwaves.ru wrote:

Hi Andrey,

On Mon, Jul 23, 2012 at 10:44 PM, Andrey Sviyazov andrey.sviyazov@fairwaves.ru wrote:

...

Today I found why noises and spurs are really happens in UmTRXv1.

Finally, we could say UmTRX is good at phase noise.

...

1. Only full disabling (no power) GPS module can kill all near spurs.

I wonder whether EB-570 is any better. And if EB-570 is no better - how could we protect LMS from this noise?

...

2. To get good noises the next changes are required:

• replace choke L6 by capacitor 10nF..0.1uF.
• remove C45.

Is it possible to apply those changes for UmTRXv2 without PCB changes?

PS Please add both points to the tracker, so we don't forget.