[hpsdr] Hermes VNA - Beta test code

[Kjell Karlsen]

Hi Phil.

Thanks for the VNA code!

I have tested it using a home brew Directional Coupler that is constructed  
for use up to 1,5 GHz. It seems to be working OK. I did not get connection  
to Hermes without entering the IP address and Hermes MAC that I found in  
PowerSDR when connected there.

When I measure, I observed that sometimes during the scan,(1-60 MHz) the  
scanning stops at about 1/3 and there is a message (after the line Hermes  
Vector Network Analyser -V1.0.0 ):does not answer or not answering  
(Depending of the translation from Norwegian!) It then fills the  
progression bar and shows a nearly flat SWR line. If I then start another  
scan, the scan is normal and the shown SWR is OK.

With this wide scan and connecting an antenna, the SWR scale is from 0 to  
100 and the RL from 0 to-100 dB. I would like to manually decrease the  
maximum SWR to let say 20 and the RL to 30 dB.

In the Smith chart I would like to have a line drawn between the measuring  
points. I reckon this is not yet implemented as the Display selection is  
grey?

I do not understand the numbers below Results. Are they for a specific  
frequency or what?

I am looking for a simple method to connect the Directional coupler to  
Hermes when it is installed together with Apollo. I have installed J1 and  
use an attenuator (R17=39 Ohm, R18= 150 Ohm) of around 6 dB. I am not sure  
it is wise to have the RX connected to Apollo while the coupler is in use.

This looks very promising!

73, Kjell





På Mon, 24 Sep 2012 13:23:21 +0200, skrev Phil Harman <phil at pharman.org>:

> ***** High Performance Software Defined Radio Discussion List *****
>
> To Beta Hermes board users.
>
> There is a Beta release of the Hermes VNA code available for testing.
>
> The code, VNA.exe, is in SVN here:
>
> < http://svn.tapr.org/repos_sdr_hpsdr/trunk/Hermes/VNA >
>
> and a draft User Guide here:
>
> < http://svn.tapr.org/repos_sdr_hpsdr/trunk/Hermes/Documentation/ >
>
> You will need to load Hermes with V1.7 of the FPGA code which is  
> available
> under Downloads on the openHPSDR.org web site. V1.8 will be available
> shortly, which will be the production code installed on the TAPR boards,
> so alternatively use that when available.
>
> Thanks to Joe, K5SO, for his work on getting V1.8 ready for TAPR's  
> production run.
>
> You will also need .NET V4.0 to be installed on your PC in order to run
> the VNA code.
>
> The User Guide is intended to provide sufficient information for you to
> use Hermes in VNA mode.  It's not intended as a detailed introduction to  
> a
> VNA but please report any glaring omissions.
>
> My thanks to Bill, KD5TFD, for programming assistance and a special  
> thanks
> to George, K9TRV, for his extensive code reviews and C# mentoring.
>
> George has also produced an installer for the PC code which we will use
> once the Beta testing is complete.
>
> Please send any bug reports and/or user guide changes directly to me and
> any bouquets or feature requests via the reflector :)
>
> 73 Phil....VK6APH
>
>
>
>
>
>
>
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