This SDR-Kits 2 port VNA measures from 0.1 upto 1300MHz. It uses an internal directional bridge and many functions besides being a darn good VNA. It has the following functions:
-VNA
– Spectrum analyser (with tracking generator that can use an offset)
– LCR meter
– You can use it as counter and powermeter (max 0 dBm)
– very stable signal generator
– TDR
– Radar plots
I bought my first one as a kit but today they are only sold assembled and tested. I also have a later version with all options like two sound devices. My homebuild is in my lab with a testset build in a 19″ cabinet. The other one is for portable use
Here: http://www.pa4tim.nl/?p=1594 you find my VNA tutorials. Some are translated by other users to French and German.
Foto’s van de bouw staan onder het hoofdstuk zelfbouw.
This VNA is designed by Tom DG8SAQ and sold by Jan from SDR kits . http://www.sdr-kits.net/Webshop/
De VNWA in zijn kleine kastje voor de ombouw
Screenshot
Het kleine ding met voedingen en testset ingebouwd
Mijn tweede, met veel dank aan Tom, DG8SAQ, maar nu portable VNWA met mini laptopje
In een mooi SDR-kits koffertje met calkit, adapters en kabels.
update jan 2014: I use a very small laptop that has a rather small battery and to much accesoires so I made a power supply, placed it in a cabinet from a telecom amp and everything including the laptop fits in a smal suitcase.
The RF tight housing including psu
The vnwa has sma connectors , I use connector savers to extend that so they stick out . This way I can use bnc and SMA. But I also use it with GR connectors. The foam is there to keep it extra supported. Old holes are closed with metal shieldsheet and a cheap RF foam made out of steelwool/hotglue,
Ready
The portable setup
Test fixtutre designed by Kurt,
This is the vnwa testkit as designed by Kurt Poulsen, a very nice danish Ham and made for a workshop. It is for sale at SDR-kits. It is easy to build and hase parts included to do the experiments yourself. At SDR-kits (www.sdr-kits.net ) you can download the tutorial this kit is made for. A nice way to do experiments and besides that it is a very handy fixture.
Ready for use
close up
A friend gave me 3 of these very nice and calibrated cables:
Very nice calibrated patch cables
After a lot of DIY cal kits and a cheap Amphenol kit, I now have the Rosenberger kit made for SDR kits. This is a major improvement at the high frequency end. It comes with cal kit specs and that is a real plus. I now get a good calibration upto 1500MHz