QST Article Reprint - Page 1
Forum section: electronics / rf-microwave

author: dgminala
author_rank: Contributor
timestamp: July 01, 2020, 12:51:27 am
content: I'm looking for a copy (PDF) of Part1 of a two-part article in the Jan, 1998 issue of QST magazine, "Build Your Own Network Analyzer" by Steve Hageman. He has somewhat of a reprint of the article on his website athttps://www.oocities.org/hagtronics/analyzer.html,but it's been severely redacted. I have a copy of Part2 of the article, which appeared in the Feb, 1998 issue, and from that, I can tell that the "reprint" on his web page is missing a lot of stuff.From the web site, the article has been made available by ARRL and QST, so getting a reprint shouldn't violate any copyright.Thanks for any help,Dave Mdgminala at mediacombb dot net

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: July 02, 2020, 12:30:31 am
content: http://www.arrl.org/copyright

author: xmo
author_rank: Regular Contributor
timestamp: July 03, 2020, 02:10:23 pm
content: I can confirm that the article is available for download by members and is copyright protected. If it's really important, you could join ARRLI am curious - what is the attraction of an instrument employing broadband receivers with a limited 50 dB dynamic range and frequency coverage to only 16 MHz?There have to be more modern designs that would yield greater performance for the same construction effort.

author: profdc9
author_rank: Frequent Contributor
timestamp: July 03, 2020, 02:35:03 pm
content: If you want, I have complete plans for a VNA including PCBs and schematics, even mostly assembled by JLCPCB if you want:http://www.github.com/profdc9/VNAHas 70 dB+ of dynamic range and goes to at least 600 MHz. Completely open source and reproducible with common parts.

author: LaserSteve
author_rank: Super Contributor
timestamp: July 03, 2020, 02:46:20 pm
content: It has been my experience that an email to the folks in Newington at the headquarters will get you a pdf of the file. Just state RF hobbyist and no interest in commercial production. Include callsign if you have a license. Phone calls work even better as they have a duty engineer on staff who handles these things.Steve

author: tanveerriaz
author_rank: Contributor
timestamp: July 04, 2020, 07:27:21 am
content: chk pm

author: dgminala
author_rank: Contributor
timestamp: July 04, 2020, 02:42:16 pm
content: Thanks for the responses. I was interested in the article because, from the "reprint" on the author's web site, the complexity of the instrument wasn't clear, and my interest was in the use of it in audio, ultrasonic & low RF frequencies. I realize that it's old technology, but sometimes it's surprising how capable old technology can be.I probably won't build it due to obsolete or unavailable components, but learning about how it was designed & built could help demystify VNA instruments for me.Thanks again for the input,Dave M

author: cdev
author_rank: Super Contributor
timestamp: July 06, 2020, 11:32:38 pm
content: The nanovna series of inexpensive stm32-based VNA products are game changing and super cheap!The main designer of the ($60) nanovna2 is a user here.

author: rcbuck
author_rank: Frequent Contributor
timestamp: July 07, 2020, 04:28:15 pm
content: I actually built that unit around 2000. Some of the parts were obsolete even by that time. It did work fairly well but the requirement that it needed to be tied to a PC limited its usefulness. Back in those days spectrum analyzers were expensive. Total different story today.

author: dgminala
author_rank: Contributor
timestamp: July 11, 2020, 05:35:36 pm
content: OK, I've looked at several places (Amazon, Ebay, Aliexpress, Banggood, etc), and from what I was able to determine from a couple of forum posts, there are counterfeits being sold. How do I determine who is selling the genuine NanoVNA2?Is there a noticeable difference between the genuine article and the counterfeits?Who is the designer of the NanaVNA2?Thanks for your info.Dave M