Thank you Dave. Here is the thing I don't understand about using the vnr4 software on our cute little vna tool. First let me say that for now all I'm interested in is less that 20mhz so these little variations that are a big deal above 100mhz don't really bother me.
When I read the PDF for the TAPR-TenTec I see 2 different calibration procedures.
1. Detector calibration. This requires coax cables shorted and open and 50 ohm load.
2. Then there is fixture calibration that seems to require the same thing but with those little sma devices that came with it.
It seems like with the our little VNA device if I only do #2 then it should be adequate, since usually the fixture is essentially the connectors on the VNA device or just very very short cables like 1 inch in my case.. Why can't I just skip #1?
Is #1 procedure a gross calibration that must be done to get the device and software in the same ballpark? maybe there is a lot of variation of devices? Bottom line What's the purpose of #1 with the software since you don't do that when using the device standalone without a pc.
Not looking to reprogram, recompile or any of that other fun stuff. Just trying to understand the process.
tks
73
