Is there any way to determine a tuners L and C settings/values such that a fixed PI network could be built to replace the tuner. Case in point. I have a QCX and the 50w amp which exhibits a mismatch b

Hi Roger, I have an H4 and constantly learn new things with this amazing device. I'm curious why your instruction step 4 states not to use the first memory slot. I know its the power up default on min

kbrkta, Thanks for the Primer. It gives me enough go start.

Jim, Im not obsessed, but curious. How do you convert to time domain, excise the bump, and back to frequency domains with the nanovna? Is tha something that vna saver can do af well? Bryan, n0luf

Hi Gary, I like that method. seems easyer. So the impedance of the coax is not an issue as long as it is resonant at the desired frequency? And this 75 ohm stub is not a problem used with an otherwise

Hi Don, I wonder how they switch that. it looks like an ordinary ferrite core coax wound 1:1 balun.. I like the concept though . Bryan, n0luf

I have a 40m wire on a 9:1 which it mostly flat, strung between 2 30 poles, is sags a little in the middle. I had a counter poise on and it was just okay. I removed it and now have just a choke at apr

Some videos describe leaving the 50 ohm load on the s11 side and leaving the other side open for this part of the calibration. Is this acceptable? Bryan, n0luf

Mike, Tell us more about your antenna. What length is your EFHW? Did your EFHW have a reflector stub of some length connected to the shield side or is it fed straight to coax? Any choke in the line at

In its simplest form you will need an sma to uhf adapter that will connect your nanvna to the tuner in place of your transmitter. Watch the smith chart along with the swr and or logmag curves while yo

Thanks Jim. Still learning this neat tool. So just the phase trace is all thats needed on s21 to measure isolation? Are results frequency dependent? Bryan, n0luf

Hi Jim, How do you do that? [ "But it's good to check (and hey, you could use the NanoVNA to measure it)." ] Bryan, n0luf

--- Since the TDR graph did identify the coax type it is not clear if the "length" includes the VF - hence is it electrical or mechanical length ? --- I always had this question as well Since you must

Great info all. I was aware that using coax with clip leads would add to some errors. I was working HF band below 30mhz so thought I might get away with it. Perhaps not. Lots to learn about making cho

Thanks all. I just wasnt sure, for a thru cal where to place the Open Short and Load bits. Its pretty straight forward for using just S11 for reflected measurements. Mike that's a great idea for ident

Hi Mike. Thanks for the reply. Just to be clear, you calibrate at the end of the S11 cable (with both cables in place). Then you connect them together for the through part of calibration. Regards. Bry

I have two short cables with alligator clips that I use for looking at baluns, transformers wound on toroids, tuned circuits and what not. When calibrating should i just tune the the s11 side or shoul

Not to be captain obvious, but on your nanovna calibration, did you reset cal first and click done when finished? I easily forgot and made this mistake early on and got weird results. Bryan , N0LUF

On my H4 I can reset saved profiles back to empty. Theres an advanced menu, then more, then reset option. I might be misquoting the menu names but its in there. This puts the vna back to factory confi

Thanks for all the good info. I apologize for getting off topic. So getting back to firmware... I've learned over the years not to toy with flashing firmware unless there is a problem that absolutely