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Merry Christmas
... to Paul and Dave and all members of our Group and their families. It's after 9pm here in eastern Australia; I must hang-up my Christmas stocking, although I probably only deserve to receive a lump of coal. :) Kerry VK2TIL.
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Paul's website
9
Hi all If you want access to Paul's web pages on the N2PK VNA & SVNA, an archive is now available on the website of the Warrington Radio club here: https://n2pk.warc.org.uk/ Best regards Dave
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N2PK VNA build instructions.
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I built my VNA a while back. Think it is the 5.2 version as it's USB and dual detector. I seem to remember there being build literature for for it when I built it as well for the RF-IV board but I haven't been able to find any of it since the web site is no longer up. I downloaded the files that are available here and went thru what I could find with no luck. I need to verify some things with my build as there seems to be a lot of noise on both channels plus it's been idle for a long time. Any info would be much appreciated. Thanks
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HI, For sale: N2PK Board (unmade) N2PK Dual Channel pretty sure with USB SMT all mounted. N Type 50ohm calibration load. I'll include more info and images once gauge interest. 73 Dom M1KTA
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lowering input frequency range to 100 hz
3
hello is it possible to lower the input frequency range of n2pk? for example if one not using toroid transformers on the output of DDS?
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Hi, I've purchased a SDR-Kits Female Calibration Kit of Rosenberger parts, it's intended for DG8SAQ VNWA, but I don't have that, I intend to use it with N2PK VNA, and R&S FPC1500 VNA. I had a question, which I'll eventually e-mail SDR-Kits with, but I thought it would be worth asking on the N2PK mailer first, since others may have done the same thing as me and obtained this. The question I have, is (perhaps a really basic one! in which case I apologize), in the screenshot in their datasheet, they show an offset delay, and a derived electrical length. A snippet from the datasheet is shown below; you can see the two-way delay of 84.70ps, and a one-way electrical length of 8.87mm. Using some simple math, I had previously believed that the offset delay can be converted to electrical length by multiplying by 0.3, i.e. 84.70ps would become 25.41mm, and half of that (since they are using two-way delay for some reason) would be 12.705mm. [cid:fd356d6e-2451-4e33-b967-7186a635a220] Link to the PDF full datasheet: https://www.sdr-kits.net/documents/Rosenberger_Female_Cal_Standards_rev5.pdf I installed the VNWA software and entered the 84.7ps value myself, and it calculated 8.887 mm mechanical? length, so that settles that the datasheet has an older incorrect screenshot, which is minor but I'll raise it with them since it is confusing to readers. However, more importantly, I'm curious how the VNWA software arrived at that value anyway, because a conversion of 8.887 mm mechanical to electrical would be 1.5 times 8.887 which equals 13.33mm , but it's still quite different from my computation of 12.705mm. [cid:f102a3a1-f2fd-44a2-a45d-f69c90ba23ba] My question is, how did they come up with the electrical length? Am I calculating it wrong, or is the VNWA software calculating it wrong? It's important to me, because on my FPC1500 VNA, the only values I can enter are lengths, so I need to know if I should be typing 12.705, or 13.33, or something else! : ) [cid:8801385d-6178-4b9f-8cc4-f688d723556c] Personally, I believe it should be 12.705, because when I calibrate like that, I believe I'm getting decent measurements. But I'd like to know if this is just luck, or if I am actually using the correct formula. Any help would be gratefully appreciated. Many thanks, Shabaz.
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Surplus VE3IVM Rev 5.2 Boards UK
4
Folks , I have a Rev 5.2 board and return loss bridge board, unpopulated. Willing to ship for postage costs if anyone can use them. Dave G4UGM
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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, changing references dont change the noise on the RFIV. The noise peaks are still there so its in the cables or RFIV unit. Granted I'm not using the top of on the box as I haven't found it yet. I have some cheap reference loads and when I use them the noise shifts with their readings. I have to play with it more, of course. Any config errors that can cause the noise to be higher in RFIV mode? thanks Jerry
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I can’t figure out how to send a photo to post… Found this morning when I was looking for an opamp. Actually found my bag of parts for my VNA, maybe I can finish my second one!
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Intro etc.
4
Hi, I built my first N2PK VNA years ago. It was right around the time V5 came out. Paul was very helpful back then. I didn't realize it at the time but there was a close link in MyVNA with the N2PK VNA and the MSA. I have a complete set of MSA boards, nice from Osh in purple that someday I might get around to building, but seeing that I have about 5 spectrum analyzers, heck maybe 10, I doubt I'll ever do it. Anyway, I haven't used my VNA in a while and thought I would take a look at a problem I have with a Dual Mixer Time Difference board. So last night when I couldn't get the driver to install, I thought I would check the group and post here. In the meantime, though, I found another set of USB install code and drivers (just the drivers, actually) and up it came on Win10. I used the code for the MSA, downloaded from https://www.g8kbb.co.uk/html/n2pk_vna.html. I just pointed the device manager at that directory and it loaded right up. I had tried previously changing the .inf files to match the device ID, but no luck. So my much loved N2PK VNA is up. By the way, I started building a second VNA long ago and was using a much better clock that I had purchased, I think I bought like 20 of them on discount. The clock had a much tighter spec. I also wanted to use a better DDS chip and had kicked around the idea of tracing the commands and using like a 14bit AD9910 or an AD9954 quadrature DDS. This 2nd VNA never saw power but seeing how well the first one works after all these years, heck, I might just go finish it. I wonder if my VNA pictures made the transition from the old group. I'll load them up if I get a minute. I had machine engraved the front panel. Hope all is well. Jerry also known as CNCJerry
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To all who are still using the N2PK VNA. Kerry VK2TIL.
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NANO VNA - EXT DISPLAY OPTION????
Has anyone set up an external display using the usb-c port? says that it will support android OS. Any information WILL BE GREATLY APPRECIATED. CRAIG
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I have a parallel port N2PK VNA circa 2009-ish, I need to interface to usb. Looking at options it appears an option from elrasoft.com built on the CY7C68013(A) with a header to parallel port PC or wiring harness might fit the bill from a hardware side. Software and driver side - I am unclear on options to either develop or utilize a driver already compiled with the newer elrasoft.com board options. Note sure who is still around or if this group has any active members. Would appreciate a reply if you are active even if you don't have the answers I am searching for. While my current hope is a W11 PC I hope to have soon a XP laptop with a true parallel port to tinker with, so my VNA journey may progress on XP but I would like to migrate to W11.
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software key
3
I have just loaded 0.95 but I need a software key. The myvna@... doesn't work anymore. 73, Rudy N6LF
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myVNA software
3
Hello, I have just received an N2PK VNA and I am looking at the myVNA software. This site appears to be the only contact for the author. I am in pursuit of the software key and hopefully any advice the group can give. Any help in contacting G8KBB would be appreciated. Regards es 73 Russell VK4ARW
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I've written a Windows program that calculates ground permittivity, conductivity, and skin depth using impedance data from a soil probe and vector network analyzer, such as an N2PK. Realistic ground parameters are important when comparing horizontal and vertical antenna models. General terrain descriptions and ground conductivity maps are much too coarse. Ground parameters also vary with frequency. With a soil probe you can determine the parameters of your local ground at the frequency of interest. Skin depth can help you assess the limitation of a surface probe when the ground is inhomogeneous. The program reads Touchstone, VNA4win, and W5BIG VNA files. See README.TXT for instructions. It includes references on making and using a soil probe. Download: http://ham-radio.com/k6sti/gnd.zip Brian
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Merry Christmas
3
A Merry Christmas to all; in particular to Paul and Dave and to all others who have supported the N2PK VNA. Kerry VK2TIL.
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FS original N2PK VNA, parallel port version, with bridge/cables/standards and PSOC board to construct USB interface
2
It's finally time for me to let this go. I have an original N2PK VNA that I built when I kitted some of these for the Knightlites QRP group. Paul had a picture of it in the gallery on his website. It will come with a half-inch-thick bundle of printed out documentation, the VNA itself in a die-cast aluminum enclosure with fan mounted, several sets of SMA cables, SMA standards, one populated bridge board, two unpopulated bridge PCBs, linear AC adapter, and the PSOC eval board which can be used to make a parallel-to-USB interface (I never got around to that). It will NOT come with a parallel port cable. I did some antenna work with it back in the day. Let's say $50, plus whatever it costs to ship. I can probably get it into a flat rate Priority Mail box, which is $16.25 Picture of everything: https://imgur.com/bl5BgYw Picture of VNA interior: https://imgur.com/E3c9kJP
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I need the BOM for the DC-DC converter for N2PK by OM3LZ. The board has a 2009 date on it. This is his third version according to the website. Hopefully someone has a copy. Jim n2go
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