Hey guys, I am looking to buy a Valpey-Fisher MO for the VNA (possibly 2 pcs). Please contact me off the list! Thanks in advance! 73 de Andrey, AE1Z...
4912
N2PK-VNA@yahoogroups....
Aug 6, 2009 1:48 pm
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the N2PK-VNA group. File : /DE0508/Power...
Hello, i start my own N2PK power supply now with LM2575T for the VNA. German OMs can participate on a group order of the single side PCB with me. We can also...
I forgot, you can find the last files on http://groups.yahoo.com/group/N2PK-VNA/files/DE0508/Power%20Supply/...
4915
N2PK-VNA@yahoogroups....
Aug 7, 2009 4:08 pm
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the N2PK-VNA group. File : /DE0508/Power...
Does anyone know how to modify the OSL calibration formulae for use with a directional coupler made from voltage and current transformers? I am interested in...
Hi Greg, ... About 6-7 years ago, I started a project I called "Z-Meter". Never built more than the V & I sensors piece of it plus a couple test circuits. The...
Hi Greg, A few other comments re my "Z-meter": 1. My Z-meter would use a -180 degree to +180 degree phase detector at the RF outputs of a pair of AD8309 log...
Hi Paul, Thanks for the reply. I have Larry's QEX article, but he doesn't mention the R+jX extension in it. Did you build the V and I sensors on to the same...
Hi Greg, ... Larry's cores, I believe, were bigger to support high power. My interest was about 100-200 watts max and I used a pair of FT50A-61 cores. ... The...
Hi Greg, ... On page 32 of: <http://www.telepostinc.com/LP-100A-Manual.pdf> ... In the vector mode, you can see the impedance of the load in two ways. The top...
Hi Greg, ... A counter-example can be seen in Fig. 11 on page 4 of my Part 1 PDF: <http://n2pk.com/VNA/n2pk_vna_pt_1_ver_c.pdf> Using a VNA measured antenna...
After successful debugging yesterday I now have a fully working VNA. One fault was an LT1677 pin that appeared to be soldered but was not. Easy to find...
Mark, I've used the 12th wave, and it works as advertised. However, the copyright to the article is owned by the League. Are you sure you have the right to...
Hi Harold, Maybe I'm missing something but I don't see a PDF to download at Mark's website. All I see at Mark's website is a link to another website so it's ...
Hi Harold, Maybe I'm missing something but I don't see a PDF to download at Mark's website. All I see at Mark's website is a link to another website so it's ...
Published in Sept 1978 Ham Radio Magazine Page 31. I use all 75 Ohm CATV hardline for my ham station and use those non synchronous transformers to good...
Below is a quick summary without having to get bent out of shape over some silly copyright issue. http://www.k1ttt.net/technote/matching.html G ... From: Paul...
Hello all, A very nice generalized calculator for computing the required lengths is available at: http://www.seed-solutions.com/gregordy/Software/SMC.htm 73...
Can someone please provide me a description of the signal waveform for DET1 nCS[DB25-8] and for DET2 nCS[DB25-9]? I am interested in the polarity, frequency,...
Hi Jim, The ADC nCS lines swing 0/5V and are active low. Frequency and duty cycle are program and program activity dependent. I doubt that you'll find much on...
Hi Gisli, Congrats on a successful VNA commissioning! Re the VNA noise floor, the best and easiest way to test for that is: 1. set up myVNA for a transmission...
Here is another method - switch myVNA to Vector Voltmeter mode - set a desired frequency and the slowest sampling rate - read ADC1 and ADC2 directly from the...
I have two (2) (new and unused) Valpey-Fisher Master Oscillators for sale. I'm looking to break-even but I'm unsure of their original pricing. Tnx! Paul,...
Paul, Dave, Thank you for the info. This has been very hekpful, --jim, AC6CR New Market, MD ... myVNA.exe ... Exeter, and in the myVNA quickstart guide there...
