[hpsdr] New version of Hermes VNA PC code available

[Phil Harman]

Hi Kurt,

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.

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. 

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.

I also find the VNA very accurate but Hermes needs to run for about 15 minutes so the results are stable.

Please send me some of your saved Measure files so I can view your results also  

73 Phil....VK6APH 



From: Kurt Tausch 
Sent: Monday, October 01, 2012 4:57 PM
To: hpsdr at lists.openhpsdr.org 
Subject: Re: [hpsdr] New version of Hermes VNA PC code available

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Hi Phil,All,

 

Tanks for the new beta code of Hermes VNA.

Version 1.3 with the new installer works fine now on XP and Win7.    

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.

I messured the transmission on a 7.6Mhz bandstopp filter (quartz notch filter) within the dynamic range of >110dB.

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).

 

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. 

I have not tested all options  aviable of  Hermes VNA so far, will do more tests  soon.  

 

Thank you Phil and all involved in developing the VNA it looks very promising. 

 

Kurt

 

DL9SM



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