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<DIV>Hi Kurt,</DIV>
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<DIV>Thanks for you feedback and glad you find the VNA code useful.
George, K9TRV, has found a bug in the code where I am not collecting the samples
from Hermes correctly – this is the reason that the display graph changes when
you repeat the same measurement.</DIV>
<DIV> </DIV>
<DIV>Today I added the feature so you can mouse over values on the graph and
read the value at that point – just like with the Smith Chart. Once we
have the fix for collecting the samples I’ll release the new version of PC code.
</DIV>
<DIV> </DIV>
<DIV>Can you please check the Phase display, I’m not sure that the Maths is
correct here since I get very little phase change over a wide frequency
range.</DIV>
<DIV> </DIV>
<DIV>I also find the VNA very accurate but Hermes needs to run for about 15
minutes so the results are stable.</DIV>
<DIV> </DIV>
<DIV>Please send me some of your saved Measure files so I can view your results
also <IMG
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src="cid:0E96E138D78740279567589FC4167689@ShackPC"></DIV>
<DIV> </DIV>
<DIV>73 Phil....VK6APH </DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=Kurt_Tausch@t-online.de
href="mailto:Kurt_Tausch@t-online.de">Kurt Tausch</A> </DIV>
<DIV><B>Sent:</B> Monday, October 01, 2012 4:57 PM</DIV>
<DIV><B>To:</B> <A title=hpsdr@lists.openhpsdr.org
href="mailto:hpsdr@lists.openhpsdr.org">hpsdr@lists.openhpsdr.org</A> </DIV>
<DIV><B>Subject:</B> Re: [hpsdr] New version of Hermes VNA PC code
available</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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High Performance Software Defined Radio Discussion List *****<BR><BR>
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<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB>Hi Phil,All,<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB><o:p></o:p></SPAN> </P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB>Tanks for the new beta code of
Hermes VNA.<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB>Version 1.3 with the new installer
works fine now on XP and Win7.<SPAN style="mso-tab-count: 1">
</SPAN><o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB>I have made various messurements in
transmission- and reflection mode. Once calibrated correctly , messurement
results are highly accurate. Even calibratingfile relod (retrieve? ) from
previous safed calibration works fine now.<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB>I messured the transmission on a
7.6Mhz bandstopp filter (quartz notch filter) within the dynamic range of
>110dB.<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB>For messurements in reflection mode
I have been using an old Hewlett-Packard 8741A Reflection Test Unit as well as
home made bridges. (with rather pur directivity).<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB><o:p></o:p></SPAN> </P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB>There seems to be still a bug in the
display scaling Y-Axis. The displayed graph sometimes changes when I repeat
several messurements with one DUT. In both modes , transmission and reflection.
<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB>I have not tested all options<SPAN
style="mso-spacerun: yes"> </SPAN>aviable of<SPAN
style="mso-spacerun: yes"> </SPAN>Hermes VNA so far, will do more
tests<SPAN style="mso-spacerun: yes"> </SPAN>soon.<SPAN
style="mso-spacerun: yes"> </SPAN><o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB><o:p></o:p></SPAN> </P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB>Thank you Phil and all involved in
developing the VNA it looks very promising. <o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB><o:p></o:p></SPAN> </P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB>Kurt<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB><o:p></o:p></SPAN> </P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN
style="mso-ansi-language: en-gb" lang=EN-GB>DL9SM<o:p></o:p></SPAN></P></DIV>
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