Re: [casper] problems with Valon sythn + ROACHI

[G Jones]

Do you have a spectrum analyzer to see how much the output of the Valon
changes when locked vs unlocked? Have you tried running the Valon at
different output frequencies when locked to see if a lower clock rate makes
your design work again?

On Mon, Mar 23, 2015 at 1:54 PM, Louis Dartez  wrote:

> Hi Casperites,
>
> For our project we are using a ROACHI with this Valon 5008 Synthesizer
>  in our 4-input correlator system.
> We are currently seeing an issue with what seems to be our synthesizer’s
> 10MHz ref input. When we drive the ROACHI correlator without the 10MHz ref
> then we have no issues. But when we plug in the 10MHz ref, our TX buffers
> overflow and the system locks up. Resetting the system (with the 10MHz ref
> plugged in) only temporarily fixes the issue (only a few UDP packets get
> out of the buffer before it locks up again). We have four ROACHI’s all
> running identical setups/firmware and only one of them exhibits this
> problem.
>
> Has anyone else seen anything like this?
>
> L
>
> Louis P. Dartez
>
> Graduate Research Assistant
>
> STARGATE
>
> Center for Advanced Radio Astronomy
>
> University of Texas Rio Grande Valley
>
> (956) 372-5812
>
>
>

[casper] problems with Valon sythn + ROACHI

[Louis Dartez]

Hi Casperites, 

For our project we are using a ROACHI with this Valon 5008 Synthesizer 
 in our 4-input correlator system. We are 
currently seeing an issue with what seems to be our synthesizer’s 10MHz ref 
input. When we drive the ROACHI correlator without the 10MHz ref then we have 
no issues. But when we plug in the 10MHz ref, our TX buffers overflow and the 
system locks up. Resetting the system (with the 10MHz ref plugged in) only 
temporarily fixes the issue (only a few UDP packets get out of the buffer 
before it locks up again). We have four ROACHI’s all running identical 
setups/firmware and only one of them exhibits this problem. 

Has anyone else seen anything like this?

L
> Louis P. Dartez
> Graduate Research Assistant
> STARGATE
> Center for Advanced Radio Astronomy
> University of Texas Rio Grande Valley
> (956) 372-5812