azonenberg has quit [Read error: Connection reset by peer]
azonenberg has joined #scopehal
_whitelogger has joined #scopehal
_whitelogger has joined #scopehal
_whitelogger has joined #scopehal
_whitelogger has joined #scopehal
<azonenberg>
xaVNA got here, now i can characterize my probes better
<azonenberg>
I have an old probe that i think was configured as 5:1 that is actually really flat
<azonenberg>
funny enough the newer pcb rev is less good, but that might be because it's a 20:1
<azonenberg>
i need to try 20:1 on the old pcb and compare
<azonenberg>
But i'm beginning to suspect that my probe is as good as it's going to get, and that the scope's input stage filter is now limiting me
<azonenberg>
some spice simulation of the system is suggesting about the same: i need a faster scope :p
bvernoux has joined #scopehal
<bvernoux>
hello
<azonenberg>
o/ bvernoux
<azonenberg>
my xavna came :D
<azonenberg>
i have s-parameters off of some of my probes but need to repeat the measurements with more points and spend some time understanding whats going on
<bvernoux>
ha cool
<bvernoux>
on my side I have received my Erasynth micro ;)
<bvernoux>
a cheap Sig Generator from 12.5MHz to 6.4GHz
<bvernoux>
really not bad for the price
<bvernoux>
azonenberg, I suspect you had seen some crash with xavna when you want too much point ?
<bvernoux>
I have not take time to investigate on that
<bvernoux>
if you try 1601pts ;)
<bvernoux>
for accuracy
<bvernoux>
but anyway amazing for the price and the fact sw is open source multiplatform (thanks to Qt)
<azonenberg>
Yeah i just started poking at it
<azonenberg>
My next focus is to try and back-annotate the probe s-parameters into my qucs sim
<azonenberg>
and try to reverse engineer the frequency response of the scope front end
<azonenberg>
once i have my qucs sim looking like the actual scope captures i'll try and figure out how to proceed
<bvernoux>
you are tuning the probe ?
<azonenberg>
i'm tuning my simulation to match reality right now
<azonenberg>
then i'm going to experiment in sim
<azonenberg>
and spin a new probe
<bvernoux>
I'm still planning to do a comparison of my HP 6GHz VNA vs xaxavna
<bvernoux>
especially with a good calibration kit to see where things can be improved on xaxavna
<bvernoux>
I have a working HI-RES smith-chart now to display s1p/s2p files captures ;)
<bvernoux>
I plan to use it for comparison of different s-params ...
<bvernoux>
as I have not really found great things related to that and tools doing that are so old and display is ugly or cannot be configured correctly ...