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Easy to do in a long thread; I've done it myself. Nice to see you posting; this group has been quiet for far too long. Kerry VK2TIL.

Ooops, sorry, missed your earlier comment. 73, Vladimir

G'day Vladimir. I mentioned this earlier. I also have a VNWA but I don't like to smooth traces, I prefer the raw data. I like to use Dave's myVNA with the N2PK; it's my tribute to Dave. Kerry VK2TIL.

Hi, You might want to check the smoothing function, just one of the beauties in DG8SAQ's VNWA software. It also runs with N2PK hardware. Cheers, Vladimir

The attached photos show the setup and calibration standards. Note that Load calibration is always 50 ohms; the 200-ohm device is used to check that setup and calibration are OK before beginning a

Where did you calibrate the load? What resistance?

Attached are; Plot of raw data and Plot of same data with Trendlines. My engineer friend would be horrified! Kerry VK2TIL.

Some VNAs, eg the VNWA, have a trace-smoothing function. myVNA does not have this. If you want a nice straight trace, set the vertical axis scale to a high value per division. I think that an Excel

things are working a little better, or were, up until I swapped the power and ground rebuilding the cable I can't find. Glad I had a current limited supply feeding it! Things are less noisy now that

I posted recently in the VNWA group about building my N2PK; /g/VNWA/message/22644 I'd been learning about vector measurements, first with a home-made noise bridge and then with a

I forgot to label the frequency axis of my chart; see attached. I should also have said, in relation to the power supply, that there is a 5v linear regulator on the rear panel of the VNA; the 12v and

Hi Kerry, Very nicely built set-up! The supply internals look great. I started building the VNA and RF-IV adapter just over 10 years ago, and I was a bit naive. Knowing what I know now, I too would

G'day Shabaz. I did some measurements a few days ago on a 10k metal-film leaded resistor; this topic energised me this morning to process the S11 file. See attached. It's clear that the RF I-V fixture

Hi Kerry, Impressive! I don't achieve that level. I tried a 5.1k resistor just now too, the charts are set to 10 ohms per division (same as yours), with 1-60MHz range total. I am using ADC speed:9,

Check that Instrument Mode is set to Reflection and RF I-V; Transmission mode should not be used with RF I-V mode. Also check that calibration mode is set to Response Calibration. These settings

I found my RFIV box but not the cable, so I wired it up and its working. It seems noisy. Just measuring my load references I get about +/- 1db noise. If I use a bridge, I get a ruler flat line. Also,

I found my RFIV box, but not the top or the connecting cable. I'll post a picture in the morning. I also found an unpopulated dual detector board. I think it is the latest, but would have to verify

yes of course, I know what it is. I just have to find my original. I had two of everything. The plan was to build a second one using a lower phase noise oscillator and a better DDS. I got the 2nd

The RF-IV is one of the most frequent things I use with the N2PK-VNA. It's really excellent. Here's a photo of my setup: <https://1drv.ms/i/s!AlgR3ZgXGd0MwBRu2dqu9KfOE--y?e=SkxVmb>

As Kurt said; the RF I-V PCB and parts (some common parts such as resistors are not included). I still use the one I built years ago; [img]https://i.postimg.cc/7hxwbt2r/RF-I-V-VNAs-2-A.jpg[/img] (Hope