Hi Hijn, Check Paul N2PK's site at <http://n2pk.com/VNA/VNAarch.html>. There's a link at point #18 on that page to 'A Relay Based S-Parameter Test Set'. I'm...
Paul, Yes, I have read the documents you listed. I DO understand that current measurements at the array to be the best method of tuning. However, to get the...
Hi Glen, I'd guess that the hybrid phase shifts would depend on load impedances. And if the loads are the antenna elements, then the net load impedances depend...
Paul, It is a Collins type (Comtek), 4.7.1.2 in the book. Fig 11-45 lower right, plus another transformer without the caps (same winding) for 180 degree...
Hi Glen, The website schematic looks like a standard quadrature hybrid plus a 1:1 transformer. If you disconnect the hybrid+xfmr+50ohm load from the relays, ...
Hi All, announcing the next board revision v5.2, which has lands for two USB connectors (only one to be used). The builder can now install the USB connector at...
Hi Glen, Probably better is to leave the control box intact and simply keep the relays de-activated. Assuming the website schematic is applicable to yours, the...
Paul, Yes, I have wondered about the wrong loads on the antenna ports. Using current forcing and 75 ohm 1/4 wave cable, a 50 ohm antenna shows up at 112 ohms....
5651
Art
KY1K@...
Apr 2, 2010 5:00 pm
Hi Ivan, This means no changes to the kits contents are needed, correct? ty. Art...
Paul, I have hooked up the VNA this morning this way: I calibrated the unit in REF at the zero degree antenna, 100 ohm load still intact. Then took scans at...
Hi Glen, I have used my VNA a number of times to make current amplitude and phase measurements in an array. My procedure is to excite the hybrid input from...
I am in the process of building my second VNA (Vector Network Analyzer) - many SMD (Surface Mount Devices) components of varying sizes and breeds on both sides...
Hi Glen, You should have cal'd the VNA in transmission mode as I said before. -- 73, Paul, N2PK See the N2PK VNA at: http://n2pk.com...
5657
Art
KY1K@...
Apr 8, 2010 6:46 pm
Hi all, Recently Digikey stopped carrying LTC chips, so I had to order directly from LTC. They told me one of the chips I needed was backorders for 2 weeks and...
Hi all The release signed version of the USB drivers are now available for download from http://g8kbb.roberts-family-home.co.uk These are designed to load...
Dave, Sincere thanks for your efforts in making 64-bit drivers available. Now, when the 64-bit OSs are natively supported, no need to boot up in Test mode ...
G'day all, For some time now I've been experiencing instabilities when using myVNA software with my N2PK VNA - I was only able to perform one or two scans...
Hi Peter, thanks for the info. May be the 3m cable was not a USB v2.0 one (which has a higher bit rate) ? I have two v2.0 cable extensions 1m each connected...
Hi all We tend not to think too much about cables but you do need to be careful. USB 2 is a 480 Mbit/sec signal sent over a differential two wire twisted pair...
Hi Peter, Please let us know if that first cable you used was indeed a USB 2.0. If it is, I suppose another possibility was that it was defective. Like Ivan, I...
Hi Ivan, My thanks to Dave too for generating the drivers and to you as well for getting the drivers signed! It seems more frequent now that I think about how...
Hi all, might anyone have one spare Minicircuits ADP-2-1W splitter I could purchase? Needed for my UHF transverter. Thanks to the group. VY 73, Wes AE6ZM &...
I completed my v5.1 VNA and ran into a bit of trouble getting it to work with myVNA. I am used to installing drivers first and software second but with my...
HI Paul Build 51 is on the way - it will contain the new dll as well as the drivers, but first there is the littlr matter of getting RFIV and Reference Mode...
Tnx Dave I really like myVNA and I'm sure all N2PK VNA owners feel the same. And as usual the devil is in the details. de Paul, W8AEF ZF2JI/ZF2TA FO8DX/FO8PLA...
G'day Ivan, David, Paul and others, Whilst the 3.0m long cable was sold as USB 2.0, I suspect it might have been old stock and very possibly USB 1.0. ...
