[hpsdr] external 10MHz reference input

[H.A.Meijer]

Hi Helmut,

Yes I know this 'buffer' does clamp the ref. input between 0 and +/- 3.5V.
I did try to change R142 to 120Ohm, then I get a kind of symmetrical 
10Mhz square wave @+/-2tt,  out of my sinus wave 10MHz.
But unfortunately that did not cure the jumping in freq, with the 
external 10Mhz standard.
Yes that 10Mhz standard is stable and does not show me that jumping.
I almost start to believe there is a FGPA firmware problem some how not 
looking correct to the 10MHz reference all of the time.......

Bert

Op 18-5-2013 13:54, Helmut, DC6NY schreef:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Bert,
>
> please be careful, don't exceed DATA/CLOCK level of 3.3V at the FGPA, that
> would kill the port. The buffer is running with 5 Volt!
>
> 73, Helmut, DC6NY
>
> -----Ursprüngliche Nachricht-----
> Von: hpsdr-bounces at lists.openhpsdr.org
> [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von H.A.Meijer
> Gesendet: Samstag, 18. Mai 2013 10:44
> An: hpsdr at lists.openhpsdr.org
> Betreff: Re: [hpsdr] external 10MHz reference input
>
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