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Tony, I was looking at the TT1-6 which is also a 1:1 and it’s listed as 4kHz low frequency limit. But I agree with you below this would be difficult on the transformers. I do think capacitance

Gary, thanks for all the great feedback. I completely agree that your sound card approach is the cleanest solution if if want to do pure audio responses. In fact I used your description of 2 scope

It could be possible to replace coupled transformers, but I doubt, that measurements can be done below 5kHz and also there is a calibration issue as well. Using different transformers means also

Yes, during development of an audio amplifier. http://wb9jps.com/Gary_Johnson/Integrated_Amp.html The VNA output was coupled to the summing node of the differential input stage, with suitable

The main limitation with the N2PK VNA is that the inputs are transformer-coupled and response drops rapidly below the 10s of kHz, along with increasing distortion. Also the DDS outputs start rolling

After looking though the myVNA user documentation from Dave (g8kbb) it appears that he has implemented every possible option using the myVNA program. I see concurrent dual detector operation and which

Thanks Toni for the feedback. Did VNA4win allow you to enter a frequency lower than 50kHz? I understand the vna may not have performed well, but was the software a limitation? Also does it do

I am also very interesting to do some HW modification to measure at low frequencies. I have no success so I was forced to use commercial instrument for this task. I also searched for any new updated

Hopefully one of the experts can help me decide if I should dig farther. I built a dual (2 detector) version the the LTC2440 (faster) ADC converters at least a dozen years ago. I'm not really sure

Right you are and thanks for getting me un-stuck. My mistake was concentrating on the Display Options tab. Thanks, Chuck

G'day Chuck. You probably have the Lock boxes ticked. https://i.postimg.cc/L65PPKHC/zzzzzz.gif I've been caught by this on a few occasions. Kerry VK2TIL.

Group - For many many years my N2PK/MyVNA combo has been great. Recently I have gotten it into a state and not found an exit. With a short cable from RF Out to Detector 1 and the M2PK ion transmission

Please take a look at the files section for this group - I did my best to capture all of the content about one year ago; of course there has been message activity since, so this is a little dated. As

To my knowledge Ivan Makarov has captured all too https://www.makarov.ca/vna.htm Eric

I did an archive of the entire group on Oct. 26 of last year. Messages, files, photos, the whole enchilada captured with PGO http://personalgroupware.com/ The message file is about 100 Mb and can be

Hello, Has someone captured all of the messages from N2PK yahoo group? Thanks, Dave - wb9own

Hi all in myVNA the calibration standards are defined in terms of fringe capacitance, resistance, inductance ( load )etc etc. I purchase a calibration KIT with parts from Rosemberger , they define the

As WFH and sorting out stuff, I have also managed to go through some of the older projects I needed to complete from 2006 and found I have a V4.1 dual detector N2PK and an original N2PK to make up.

Hi Marc, Thanks for the information! Now I understand how I should have laid it out. For now I have added some copper shielding and the stop-band has improved to about 60 dB, which is still not great,

Hi Shabaz I think your bench platform need some small improvement. Your coils seems to touch the aluminum shielding, causing an important parasitic capatitor between your inductance and ground, and