AmateurRadio.com

In the January 2023 issue of CQ Magazine, there is an article I wrote introducing my Sherwood Tools page over at FoxMikeHotel.com. Didn’t make the cover but it is on page 50! It will introduce the reader to these new tools to further utilize Rob Sherwood NC0B’s test suite of bench measurements on over 50 years of radios. I appreciate Rich Moseson (CQ Editor) for wanting to further publicize these online tools that I’ve created with the significant assistance of Rob Sherwood NC0B. He is an international treasure to the amateur radio community!

I update this webpage as I’m able to digest and process new data from Rob’s Table. It does take some time for me to reanalyze these data segments, as even one new entry alters the patterns and analysis from the previous dataset. If I am in the midst of other matters, it can take me a month or more to get to this update. (Amateur radio is a hobby, not a lifestyle, for me, lol.)

This work on price, performance and satisfaction with HF radios has been very popular over the past couple of years as I’ve given many talks to groups via Zoom on the studies and results. The first results from this line of research was published by (then) Editor Scott Wright K0MD at the National Contesting Journal. I’ll be adding the latest Yaesu HF radios (FTDX10 and FT-710) to the mix soon.

Stay tuned because I’m completing the analysis of a subset of these modern transceivers that includes composite transmit noise base upon data from a group of European amateurs complemented with measurements by Rob Sherwood NC0B. I’m completing that work and associated manuscript in the coming weeks.

Dave Goodwin, VE3KG, RAC Regulatory Affairs Officer at the Radio Amateurs of Canada, has just posted the results of the 2022 RAC Survey on their website. It was my honor to work with RAC to analyze the data and draft the technical report. The executive team at RAC is a delight to work with: they just want to get the best answer from the data. That’s what every organization should desire so that effective policy can be made. That is why I volunteered a considerable amount of my time to work with this team.

The map above depicts amateurs in the current Canadian database of certifications (licenses), regardless of when it was granted. Thus, there are likely many Silent Keys represented in the map. But it is the universe that must be the starting point. They are quite spatially concentrated, no? But they are no doubt conversely as diverse as hams are in other countries as well. This means we must have solid, reliable data in order to make the optimal policy recommendations on their behalf. RAC takes this mission to heart.

The issues surrounding call signs in Canada is the focus of the 2022 RAC Survey. I invite you to use the links above to take a look, or even a careful reading, of the technical report. Dave Goodwin put a good Canadian spin on my Americanized spelling and offered questions that help any statistician improve a draft report. Otherwise, David and Phil McBryde VA3QR, RAC President, left the analysis to me, a professional survey researcher and statistician.

The Regulatory Team at RAC consists of Dave Goodwin, VE3KG, Paul Coverdale, VE3ICV, Bryan Rawlings, VE3QN, Glenn MacDonell, VE3XRA, Richard Ferch, VE3KI and Serge Bertuzzo, VA3SB. They have done great work here! I look forward to other collaborations with RAC. You can find out more about this team’s efforts on behalf of amateur radio in Canada at their YouTube presentation embedded below.

And, oh, I just renewed my RAC membership for 2023! I encourage you to do the same.

As an academic researcher, the term “authoritative source” is reserved for works deemed to be the standard by which other scholarship in an area is judged. As a U.S. ham, I’ve purchased the ARRL Antenna Book (both new and used) since I’ve been licensed. Good reading and reference. It’s been a go-to document not only for me but for many State-side hams. There is a new Sheriff in town.

I’ve read about Rothammel’s Antenna Handbook in other publications—Practical Wireless and RadCom, for instance—but it was in German. Alas…Ich spreche kein deutsch! Since 2019, there is an English translation.

On eHam, there is but a single review. James AD0YO says, “This book is amazing! It should be on the desk of any ham interested in antennas. And, that should be all of us. The first 270 pages cover theory. The rest cover all types of antennas.” OK. James loves it. What about others?

A website I often read, the Reeve Observatory near Anchorage AK, has a review: “The information in Rothammel’s Antenna Book appears to be taken from both amateur and professional literature and patents from around the world. Having this book generally will save readers considerable time when looking for details on a particular antenna type or for ideas on what antenna to build for a certain
application. Each chapter has an extensive list of references, so it may be possible to get to the original source document.”

The popular commercial vendor in the U.S., DX Engineering, carries this volume (although out of stock as I write this). It also has only a single review. Two years ago, Juan (no call) wrote, “This is a 1,600 (page) treatise on Antennas! It is more theoretical than the ARRL Antenna Book, but quite less than John Kraus classical textbook. It has a ton of data and practical information. It is a very good comprehensive reference book on antennas.” Another onesy but rave review. No gotchas yet.

Another source I enjoy, Radio User magazine, had this announcement. “The famous Rothammel’s Antenna Book is now, at last, available in English. At the 2019 Hamvention, DARC announced the availability of the wonderful Rothammel’s Antenna Book into English. This translation is of the 13th edition of Rothammels Antennenbuch.” Now I recall my friend, Scott K0MD, telling me that he picked up a copy of this impressive book at Hamvention. Great international reviews. A close friend who bought it and is impressed. Wow! This is getting close to my wallet.

Rothammel. Who is (was) this guy? Wikipedia advises “was” is unfortunately the correct tense as he is now a Silent Key (1914–1987). After reading a short biography on Rothammel, it strikes me that he would be in league with Lawrence Cebik W4RNL, a professor of philosophy at the University of Tennessee in Knoxville, long revered for his antenna work and writing. From the German Wiki, translated to English by Google Translate:

“Rothammel had been a radio amateur since 1932 with his call sign “DE3040/L”. During World War II he served as an Air Force radio operator. Little is currently known about his stay after the war, except that he settled in the Soviet occupation zone – the later GDR.

After the war, he initially worked as a guest and farmer before moving to the postal service of the GDR for ten years. At the post office, he looked after the radio and television transmission systems. After ten years, Rothammel moved to the information and documentation center at the radio equipment factory Stern-Radio in Sonneberg, which later became VEB Stern-Radio Sonneberg . He did this job for 25 years until he retired. Since 1954 Rothammel was active as a radio amateur under the call sign “DM2ABK”, since 1980 under the call sign “Y21BK” or “Y30ABK”.

In addition to his professional activities at the post office and at VEB Stern-Radio, Rothammel was a long-time club station manager in Sonneberg, a member of the examination committee in the Suhl district and an authorized person for the radio performance badge in gold. For five years he wrote articles on VHF topics for the magazine Funkamateur. In addition, he contributed as an author to various publications on the subject of radio, for example the books “Ultra Short Waves”, “Practice of TV Antennas Part 1 and 2” and the “Handbook for Short Wave Amateurs”, etc.”

I ordered a copy of the 1st Edition English translation, copyrighted in 2019, directly from the DARC. Easy order. It took several weeks to arrive via DHL and final delivery by the US Postal Service. I was researching HF loop antennas for an article. I was thrilled at the depth of coverage and the detailed citations and patents included. It greatly helped me organize my thinking on how to improve the design and deployment of an HF horizontal loop antenna. More on that article in the near future as it nears publication in Practical Wireless magazine.

Here’s an illuminating example on a relatively unknown niche type of antenna. Here in the States, due mostly to posts on QRZ.com, the reader would conclude that fractal antennas were wholly invented by Nathan W1YW. As the sportscaster Lee Corso is fond of saying, “not so fast!”. Look at what I read on pp. 948-9:

In the same year (1995), two researchers filed patent applications for something they called, fractal antennas. In May, Dr. Carlos Puente in Spain filed his application which was approved in 1998. Later, in August, Dr. Nathan Cohen filed his patent application in the United States but it was not granted until 2000. As Rothammel states, the priority goes to the first filing. This small point may only matter on legal issues but it’s both enlightening and historically correct for the amateur radio community to know that there were indeed two “inventors” of the fractal antenna line. Lots of good stuff like this in the Rothammel Antenna Book.

So does this book replace the need for the very popular Antenna Handbook by the ARRL? Not at all, as the ARRL book is geared more toward pedagogy and far less on being an authoritative reference. Rothammel’s book, for instance, does not include supplementary software, data files (antenna models, propagation projections, etc.), and such. Editions of the ARRL book do overlap greatly across adjacent editions so that’s caveat emptor for the buying ham. Me? I have quite a number of the ARRL Antenna Handbooks, as well as most things written by Joe Carr and other antenna scholars. Now, the Rothammel’s Antenna Book is on my bookshelf right beside them. I won’t have a problem finding it at 1,600 pages in length!

I can add my own superlative review to those quoted above. It’s not been fully read thus far but the spine and pages are certainly creased quite a bit! I’ve read deeply on loop antennas and through the theory section. It’s now my authoritative resource for amateur radio antennas.

This post is to lift up the recent editorial published on eHam.net by Onno VK6FLAB in Australia. His long running podcast, Foundations of Amateur Radio, is one of my favorites. I listen to it every time it drops in my podcast catcher. I’m slowly making my way through the previous 500 episodes. Not one has been disappointing. Onno has recently taken on the scourge of social bullying in our hobby. It affects everyone, not just the bullied.

Once the collective atmosphere of a group, however large or small, has become contaminated by the blind or even oblique tolerance of bullying behavior by even one member of the group, it is there for all to be potentially subjected. The tolerance of bullying will precede new members and succeed former ones. While “bad character” may be the original culprit, the social norms of the group become the active agents of that tolerance of it in the future.

To be clear, our community is a welcoming environment, filled with hope and joy, but there is a small rotten element in our midst that we need to rip out root and branch, much like we would if it was deliberate HF interference.

Onno VK6FLAB on eHam.net

Onno’s essay at eHam.net is available through the link below. I encourage you to read it with an open mind as to your own behavior and those with whom you associate. Being bullied through social media tends to begat your own negative response. I wish I could state that I have never responded in that way. But I cannot. My commitment is to reduce any such behaviors in response to those engaged in bullying of me and to defend those being bullied.

As a professional sociologist who has studied social movements, almost always involving violence, I wish that I could offer a complete answer to the problem. But I do know that Onno is on the right track: tolerance of the problem will only exacerbate it. If you value the amateur radio hobby, it is worth your time and consideration to see what Onno has to say.

To read Onno’s editorial at eHam.net, click HERE.

Have you ever been invited to visit with a group of radio amateurs and just felt like you’d dropped in at home? I’ve had the pleasure of that a few times. One of those groups is the Denby Dale Amateur Radio Society in England. Their Chairperson is Nick Bradley G4IWO. He’s invited me to natter about with the DDARS several times over the past couple of years. Last week, I spoke to them about my RadCom articles with Dr. Scott McIntosh that appeared this summer.

The talk is now on their Youtube Channel below. I hope they get back soon to meeting in Pie Hall, where they are served pie and peas. After all, Denby Dale is the home of the world’s largest meat pie! If the pie is as welcoming as the group that typically meets there, it’s very good indeed!

It was an honor to be asked by Nathaniel N2AF to kick-off this year’s series of online talks last week. We are kicking-off another football season so I actually got to play in this one! There were 60 or more in online attendance and several who sent in notes that they couldn’t make it but wanted the link to the video. And…great, great questions from the audience!

Here’s the announcement from over at the HamSCI.org website. The link to the Youtube video is at the bottom of this post. Comments and thoughts are welcomed! I’m good on QRZed.

Seminar: Revolutionary Alternatives in Sunspot Prediction

Thursday, August 18, 2022 – 23:45

Thursday, August 18, 2022 – 23:43

Submitted 2 weeks 3 days ago by w2naf.

Dr. Frank Howell K4FMH will present a seminar based on his two-part article in the July & August 2022 issues of the Radio Society of Great Britain’s RadCom journal, written with Dr. Scott McIntosh of NCAR in Colorado, titled, “On the Cusp of a Scientific Revolution?” The seminar includes the latest theory construction and model estimation. The seminar will be held on September 1, 2022 at 4 PM Eastern (2000z) during the weekly Solar Eclipse QSO Party Zoom Telecon. Frank is Professor Emeritus at Mississippi State University, Affiliated Faculty at Emory University, and a scientific member of HamSCI.

Abstract: Sunspots are the Dow Jones Industrial Index for hams. We are faithful to the sine wave model of the approximate 11-year cycle with the official NASA/NOAA predictions being our Holy Grail. I’ll address the following issues. How did we get to this sine wave conception? How do scientific paradigms compete and change? A new competing paradigm by the McIntosh team has been proposed. What’s new? What’s both the theoretical and empirical basis for this Kuhnian revolution in predictions? For Cycle 25, I’ll compare the official NASA/NOAA versus McIntosh team projections of SSNs and how they are constructed. I’ll also show how they compare to observed sunspots in the Cycle. Can we now better predict the underlying phenomena driving the amplitude and transition of a cycle? This model competition may well parallel the Newton-Einstein paradigm clash a century ago where science hung in the balance while solar eclipse photo plates were taken in Brazil and the Island of Principe. Now, we can follow along and see: will there be a scientific revolution in sunspot prediction?

Link to the Youtube video:

The old Baofeng HT (UV5R) is the butt of many jokes these days in amateur radio. But right after their introduction, they were the “Xiegu HF rig” of the moment: they mostly worked, were cheaper than many similar products, and hams just had to explore them!

I bought a few, kept one, but gave them to new hams. Heck, I even purchased a case of Baofeng’s to supply the new amateur radio club in my home county of Washington County, GA. They would charge them up, program them for the new repeater, and gift them to newly licensed Techs in Sandersville and there abouts.

What happened to the one I kept? Well, if you have a minute, here it is.

The Jackson MS area had fallen by the wayside in terms of APRS digipeaters. But it really sucked by not having any iGates. A fellow ham who was head of Security at an area hospital installed an iGate serviced by backup power as part of their EmComm effort. That was fine…until the IT team monkeyed with “odd” IP connections and just cut Internet service to it periodically. The turnover in IT kept the Security Head (the ham) busy renegotiating service behind their firewall. So he eventually got them to put it on the guest WiFi sector and it’s been serving the area reliably ever since.

But N5DU and I led the effort to add more digi’s in the greater Jackson area, donating ones to the Vicksburg Club, a tower east of us that the manager (also a ham) gladly installed, a node at a nuclear power plant at Port Gipson, and one down I-55 South near Crystal Springs. But only one iGate to serve them really got in the way of educating the other digi managers to configure the right number of “hops” to effectively get to an iGate.

So I used my remaining Baofeng HT with a small footprint PC (Dell OptiPlex 160 Tiny Desktop, bought for $40 shipped via eBay) and a software modem to create a second iGate in my home (K4FMH-10). As the picture from APRS Direct above illustrates, it’s in the large footprint of the JARC digi installed on a water tower in Madison, MS to the NW of my QTH on the Barnett Rez. (See inset of my iGate’s estimated footprint by APRS-Direct. No, KI5JCL-9 isn’t riding a horse. He just has a sense of humor!)

It’s stored in the bottom of a builtin cabinet in my small library / printer closet adjacent to my 2nd floor office. It’s 3 miles from a nearby APRS Digi maintained by the Jackson ARC (my friend N5WDG maintains their repeaters and other digi devices). And, it sits in the supplied Baofeng charger. For over 2 years, working faithfully. Until it didn’t. And that’s the focus of this story.

The higher power battery is a slim-line model. I thought that would be good for this little iGate-robot. (See the picture on the left.) And it has been.

Bobby KG5TGT later added a 2-way iGate to the Southwest of Jackson. It covers several Digipeaters on that side of town: the JARC’s 2nd digi on a broadcast tower, Vicksburg’s Digi (that N5DU and I donated), and the monster on a tower at the nuclear power plant outside of Port Gipson. FB all the way! Until this happened.

Yep, over a day’s period, the 2 year-old high power battery (Baofeng marketing-speak) hit it’s outer charge limit and expanded several times over the slim size that it was…well, the day before!

All this happened while I was in a recording session for the ICQ Podcast. Unbeknownst to Martin M1MRB and my fellow Presenters, I simply ordered a replacement on Amazon that was delivered in 2 days. The K4FMH-10 iGate was back shipping packets into the APRS network.

The moral? Oh heck. Just check your batteries periodically. While I thought I had, this could have produced a fire. Fortunately, I’m in that small room every day for various things and I look at the iGate system. But this expansion occurred over a 24-hour period. I should take steps to create a more robust iGate unit. But that might mean I’d become Baofeng-free!

Do you have a Baofeng lying around, getting no use? Find a way to put it to some good. But do check the battery from time to time.