Great show. That meter trick only works on type 31 ferrite. all outher ferrite test open. 43/52/61/67 tested . The powered iron ones are mostly painted a color for the mix and test open because of paint. to tell the 43 mix from a 61 without looking looking just wrap a wire a few times and use a VNA . This also a way to check if core is damaged. Like getting too hot changes the permeability. If you stop TX on a UNUN when SWR goes crazy and let the toroide down you are fine. If you keep going the core will crack and SWR will stay high , 73
Met Rudi at Hamcon Zion, the man knows his stuff. He was showing off a 3 position switch with a 50 ohm resistor and an SO239 for rapid calibration of a nanoVNA. Rudi, hint hint, do a video on how to build it.
Going to listen to this on my commute to work .. sounds like a guy after my own heart!
Hey Tim 👍
Great show. That meter trick only works on type 31 ferrite. all outher ferrite test open. 43/52/61/67 tested . The powered iron ones are mostly painted a color for the mix and test open because of paint. to tell the 43 mix from a 61 without looking looking just wrap a wire a few times and use a VNA . This also a way to check if core is damaged. Like getting too hot changes the permeability. If you stop TX on a UNUN when SWR goes crazy and let the toroide down you are fine. If you keep going the core will crack and SWR will stay high , 73
Met Rudi at Hamcon Zion, the man knows his stuff. He was showing off a 3 position switch with a 50 ohm resistor and an SO239 for rapid calibration of a nanoVNA. Rudi, hint hint, do a video on how to build it.
It was great having him on the show
Wouldn’t Rudi’s “Noodletenna” be considered a 3-D fractal antenna ??
Hell of if I know.. lol sorry man
so ive played it back and still can't understand what im hearing........ What is the German book y'all were talking about?????
th-cam.com/video/JKGnSU76lqk/w-d-xo.htmlsi=6cSs-ne8wjprtu_n