Hi guys, I am new to the group and also new to VNAs and specially the N2PK-VNA. I have read as much information as I have been able to, and am really wishing...
Hmm Strikes me your "experience" is a tad limited and your assertion to have read as much as you can to be a bit far from complete. Yes, they are more...
So is it ok to have a switch mode supply for the 5V supply? I'd like to get the entire power solution on one PCB so I've been looking at using a Linear Tech...
Hi Jaac, I suggest you build your N2PK VNA using the current proved design. Hundreds if not thousands of hours of work were invested by several people to...
Hi Brett, ... Yes. See my switcher with filtering in my Part 2 PDF. Also see posts here by Miro, OM3LZ, who has done some nice power boards. 73, Paul...
Brett, I believe you are trying to overthink this situation. Power requirements are 10V @ 50 ma and 5 v @250 ma. I like linear regulators because they are...
I'm with Don; I prefer simple linear supplies unless there is compelling reason (usually heat dissipation or mass/bulk) to use switching supplies. I used...
Hi Dave, Thanks for the reply. I think you misunderstood me, or maybe I was not able to make myself be well undersood. I have a not so short background in...
Hi Ivan, Thanks for your kind reply. I realy think you have done a great job with your design, and is inedeed the route I would like to follow. I want also...
Hi Jaime Ok - That is a different message completely. Your criticism was that the cypress was expensive, difficult to use and hard to get so you proposed to...
Due to retirement and downsizing, I am forced to choose between RC Airplanes and amateur radio. Since I can't really do antenna work anymore, RC Planes won....
Ok so I'm a bit short on the Tantalum caps but I've got all the DDS rails up and I've loaded the Cypress chip and the EEPROM and I was able to put its...
Brett, you can use the Signal Generator mode, I do not think it wants the ADCs unless you specifically enable them in that mode. Ivan ... From: "Brett Howard"...
hi barry what comes with it? OSL loads? adapters for 'normal' feedlines? etc ? 73, w5xz, dan ... From: blcromwell <blcromwell@...> Subject: [N2PK-VNA]...
A very nice instrument; at that price, no wonder it sold quickly; http://cgi.ebay.com/N2PK-VNA-/150488556968?pt=LH_DefaultDomain_0&hash=item2309d125a8...
Hi Paul, Silly of me, having visited Dave's site seveal times, I can not explain myself how I did not land to the "Downloads" section. Really impressive work,...
Hi Dave, Thanks for the message, very much encouraging. While I get me the components (already started the process), keep reading and studyng. And now that I...
So are there any other pre-fab boards for transverters and/or S-Parameter test sets? Or even board design files for ordering through express-pcb or some other...
Well the signal generator mode *DOES* work! It seems to have a lot of change in amplitude with the quick crude measurement that I took which was to just put a...
Hi Brett, There is a plot of RF DDS amplitude into 50 ohms v. frequency here: <http://n2pk.com/VNA/DDS_Anti-Alias_Filter_Redesign(5p1).pdf> If yours doesn't...
Well based on the graph I'm not so sure that I'm there but I also highly mistrust my measurement setup. Early next week I'll actually install the SMA...
Hi Brett, ... Right. ... That plot starts at 1 MHz and the measured for that filter would be quite close to the simulated shown there. Page 12 at the following...
