[hpsdr] Help with Hermes VNA

[Martin Emmerson]

I am not sure what version of the VNA software for Hermes is causing your
problem but a
long time ago around 2013 I did some work on the original VNA code for
Hermes as it had
problems connecting.
I did this in conjunction with Phil Harman and I ported some code from the
"KISS Konsole"  and
with the addition of repeated tries to connect I got it working reliably
and I think this version
was published and had my callsign on the about box.
Then I found this version:
http://www.dxatlas.com/hamvna/
Which worked reliably with the Hermes and had no problems with connecting
but the remaining
problem is that while the Hermes is an excellent SDR transceiver it is not
a very good VNA!
This is because leakage between the TX and RX terminals, limiting its
dynamic range.
Made worse if you have the necessary RX/TX switching connected. Direct
connection to the
Hermes SMA connections, it is just acceptable.
I was so impressed with HamVNA that I modified the code to also work with
my dedicated N2PK
VNA.
Then I found NanoVNA available on eBay for less than £50 which goes right
up to 900MHz and that
is now my VNA of choice.
Just my view on the VNA for what it is worth.

73's

Martin G3OQD.


On Sun, 6 Dec 2020 at 16:58, Helmut Oeller <dc6ny at gmx.de> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Very, very strange, John.
>
> I'm no software coder and sorry, I don't have further ideas available.
> Many, probably most HPSDR fans are using today win 10 as OS. Even my old
> Ozy on an ATLAS configuration works great with PowerSDR v.3.4.9 and win 10.
>
> Hopefully somebody can help you soon.
>
> 73, Helmut, DC6NY
>
>
> Am 06.12.2020 um 16:55 schrieb radio at netins.net:
> > Thanks Helmut.
> >
> > I am having trouble getting hamVNA to install.  It worked OK before I
> > replaced Windows 7 Pro 64 with Windows 10 Pro 64.  I later uninstalled
> > it and tried to install hamVNA2 a couple of years ago, but later
> > uninstalled it, too.  Hermes VNA worked fine until I installed Windows
> > 10.
> >
> > Today, I did get hamVNA to run once, launching it by selecting run
> > during the install but it would not connect to Hermes.  Attached is a
> > screen shot.  However, it could not find Hermes.
> >
> > When I click on the icon for hamVNA it doesn't load the program.
> >
> > Windows 10 is very frustrating.  I can't find where to make a program
> > run in Windows 7 compatibility mode.  It wants to try Windows 8!
> >
> > Any ideas what I should try next?
> >
> > John,  W0GN
> >
> >
> > On 2020-12-05 10:09 am, Helmut Oeller wrote:
> >> Hi John,
> >>
> >> your issue is really strange. I  also attached a screenhot showing the
> >> connection data and a measured object.
> >>
> >> I can't tell you what version of NET is working here, because NET was
> >> automatically installed together with win 10 and no longer listed in the
> >> general app file. But I have also different versions of MS Visual C ++
> >> 2008/2010/2013/2015 Redist... on the machine as well as win10Pcap.
> >>
> >> May be you should try to use 'discover function'  with the HPSDR
> >> programmer tool to verify connection data. Another option can be the HAM
> >> VNA v.1.1:
> >>
> >> http://www.dxatlas.com/hamvna/
> >>
> >> This a very comfortable VNA software for Hermes too.
> >>
> >> Hope for soon success.
> >>
> >> 73, Helmut, DC6NY
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