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<div class="moz-cite-prefix">Hi Helmut,<br>
<br>
Yes I know this 'buffer' does clamp the ref. input between 0 and
+/- 3.5V.<br>
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.<br>
But unfortunately that did not cure the jumping in freq, with the
external 10Mhz standard. <br>
Yes that 10Mhz standard is stable and does not show me that
jumping.<br>
I almost start to believe there is a FGPA firmware problem some
how not looking correct to the 10MHz reference all of the
time....... <br>
<br>
Bert <br>
<br>
Op 18-5-2013 13:54, Helmut, DC6NY schreef:<br>
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<pre wrap="">***** 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: <a class="moz-txt-link-abbreviated" href="mailto:hpsdr-bounces@lists.openhpsdr.org">hpsdr-bounces@lists.openhpsdr.org</a>
[<a class="moz-txt-link-freetext" href="mailto:hpsdr-bounces@lists.openhpsdr.org">mailto:hpsdr-bounces@lists.openhpsdr.org</a>] Im Auftrag von H.A.Meijer
Gesendet: Samstag, 18. Mai 2013 10:44
An: <a class="moz-txt-link-abbreviated" href="mailto:hpsdr@lists.openhpsdr.org">hpsdr@lists.openhpsdr.org</a>
Betreff: Re: [hpsdr] external 10MHz reference input
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