Re: [softrock40] Announcing PySDRVNA - A Software Toolkit to use your SoftRock as a VNA
- Excellent, I'll have to get the Ensemble RXTX again to test. I haven't looked at whether or how a RLB could be used with the RXTX to lessen the possibility of damage to the RX frontend.
I wonder if anyone has tried qvna.py that comes with quisk using a softrock.
I have used qvna.py and the dl2stg.de qvna with the HiQSDR where it worked well checking out my Lightning Bolt Quad on 20m - 10m and for which there is also a Return Loss Bridge (RLB) to use with it.
Dave, with the UHFSDR wired for separate antennas it should be possible????
http://dl2stg.de/stefan/hiqsdr/qvna.html for Stefan's HiQSDR qvna built with qt4. The page also has the plots. The idea for Hermes VNA was based on Stefan's HiQSDR qvna, except the Hermes VNA software is for Windows only.
The one chosen for Hermes/HPSDR is at www.wetterlin.org/sam/SA/Operation/3BeadBalunBridge.pdf
Another useful writeup is at rhttp://www.yagicad.com/projects/ARRLB.htm
I need to try Hermes VNA under Crossover Office on Linux. So far with Crossover Office I had PowerSDR running very slowly but with recent CXO versions I have not got it to launch. Rocky used to launch but could not access the sound cards when tried with Softrock.
openHPSDR Kissconsole under CXO finds Hermes but fails looking for Alex filters that I don't have fitted or selected and no one on the reflector has offered up a suggestion though it's been reported to work under Windows..
73 ... Sid.
On 26/06/13 03:44, shaynal01 wrote:
Inspired by Rocky's VNA mode, I've written a software toolkit (http://pysdrvna.googlecode.com ) that enables a SoftRock RXTX Ensemble to be used as a simple vector network analyzer. The differences with Rocky's VNA are listed below. I have found this software very useful for antenna experiments and want to share and develop it with the SoftRock community.
- Only runs under Linux with a working Jack Audio and SoftRock setup. A brave soul should be able to port it to Windows.
- Makes use of the Si570 found in the latest SoftRocks to sweep across the entire supported frequency range of your SoftRock.
- Measures complex impedance, reflection coefficient, SWR and return loss.
- Uses an interactive and programmatic Python interface as this is what I like for experiments. In fact, the tutorial is an iPython Notebook that you can walk through and execute step by step. (Think MATLAB notebook.) It should be possible to wrap a GUI around the toolkit.
- Generates high-quality plots and smith charts with matplotlib. Visit http://pysdrvna.googlecode.com to see examples.
- Requires only 1 or 2 minor modifications to your SoftRock RXTX Ensemble. These modifications are described on the site and should also allow you to use Rocky's VNA with your SoftRock.
-- Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support Senior Staff Specialist, Cricket Coach Microsoft Windows Free Zone - Linux used for all Computing Tasks
- Thanks for capturing several other bridge and SDR VNA projects. I did look at Quisk's VNA and correspond with the author, but decided it would be quite a bit of work to modify it to work with the SoftRock RXTX Ensemble. I have looked at the qvna software in the past, but not closely as it doesn't work with the SoftRock. The only other VNA software that works with a SoftRock that I am aware of is Rocky's VNA. Are there others? I only have a SoftRock and wanted something inexpensive to use for antenna experiments. I've been quite happy with the results I am getting and would love to hear about how it works for others.