Sherwood Tools Available

The work that Rob Sherwood NC0B has contributed to the public over the past decade is unique and an amazing service to hams worldwide. I’m talking about, of course, his summary Table of receive bench tests published at this Sherwood Engineering website. He is independent so no one can think that advertising dollars could skew his assessments or how he presents them. As a CW contest operator, he is very clear that he sorts his table on the basis of what his experience and training has shown him to be the single most important measurement in his table: the narrow dynamic range.

I am not a CW operator or accomplished contester (lol) but enjoy the latter with my small team of fellow hams. But I am a statistician who likes to focus on problems where analytic tools can help foster a wider understanding of the data surrounding the problem area. So, working with Rob NC0B, I’ve created a set of “Sherwood Tools” to visualize his data as well as link them to a couple of other critical aspects of a rig purchase: market-entry price, consumer satisfaction, and the year the radio entered the market. These four vectors of data drive all of these tools, now available over at

3D Sherwood with Market-Entry Year

The tools include a sortable Sherwood list where you can sort on any of the nine tests he publishes as well as the composite index of them that I created and included in my two-part NCJ articles in 2021. A set of 3D data visualizations are available to simultaneously view radios on four data elements (that does make it 4D, technically). Several graphs illustrate key aspects of the data, including how to not get tripped-up in the “ranking” of radios where the bench measurements are just not appreciably different. Seeing how the past 50 years of radios appearing in Rob’s Table have made a remarkable and clear progression toward the best receiver performance that modern test equipment can detect is in another tool. In addition, how the trend in getting a receive bang-for-the-buck has progressed over this 50 year period is there, too. Finally, I’ve used the industry-standard tool by Gartner, the Magic Quadrant, to help isolate radios in Rob’s Table that perform and are rated above average at various price points. I call these the Golden Quadrant Lists.

Rob NC0B has not endorsed these tools and neither have Scott K0MD or Bob K0NR. But all three have given advice and suggestions for how I’ve designed them for which I am very grateful. None should be held accountable for any mistake or result that the viewer may find there. I hope these Sherwood Tools are of use to viewers who are evaluating rigs. (They have been to me over the past two years of doing this research during which I’ve purchased two new HF rigs.) Making a written set of must-have features is a critical complement to these tools. Just like Smokey the Bear says: only you can put out forest fires. Only you can determine the feature-set and ergonomics to satisfy your use-case for a new radio!

I’m outlining a talk on the use of these tools should clubs wish me to visit with them via Zoom. See my contact tab above. I’m good on QRZed.

Solder On, Garth…

While I would love to think that in Wayne’s World, this article would be “excellent,” that’s for you to decide! In this month’s Practical Wireless magazine, my article, “Need a Hand? Or Six?,” is on the cover. Like many hams, soldering work on the bench takes many forms. A lot of that involves setup time to get the right tools in place to begin. I really like to minimize these things so that my limited time is spent goofing up a solder joint..uh, making good soldering joints…and getting things done.

I also have been immensely dissatisfied with the cheap “helping hands” devices found at every hamfest or rally I’ve attended. The magnifying glass tips over too easily, there’s really not enough “hands” to suit me, and if I drop it on my garage floor, it’s likely to shatter. So I was inspired by a previous article in the April 2021 PW about the fabrication of a jig to do SMD work by Michael Jones GW7BBY.

My “artisan” soldering platform is my current solution to having a rather full-featured 12″ square platform with numerous “hands” to hold parts for using my two hands for holding the soldering iron or gun and the solder thread. It’s an honor to publish in Practical Wireless, smartly edited by a world-class contest operator, Don Field G3XTT. His book on 6 meter operation was recently revised and it’s well worth reading before practicing the “magic” in the 50 mhz region!

Keep Soldering On is from my article this month in PW

3-D Sherwood!

Due to questions I’ve received during club talks to visualize all three dimensions of price, performance and satisfaction in HF rigs, I’ve assembled a 3D data cube (scatter plot) with these three measures together. This includes the composite Sherwood Receive Tests (SPI), price at market entry, and the eHam rating. The data cube points are color-shaded to reflect year-of-entry into the marketplace. These data are updated with Rob NC0B’s March 5, 2022 test data. A few (older) rigs without eHam ratings were removed.

Go to this link over at to take a look. I may do some additional analyses in the near future so stay tuned if you’re interested in Rob’s work and related data.

Elvis Left the Building…in 2015

Paying homage to the cultural icon and frequent use of the phrase, my latest Social Circuits column is now available over at I’ve analyzed ARRL membership numbers and licensed hams over the past two decades. The results show some surprises, both in the growth segments of ham licenses and in League numbers. But the most demonstrable finding is captured in the phrase, Elvis Has Left the Building…but in 2015. Go here to find out what this means and perhaps why.

Meanwhile, Elvis ain’t coming back. But the League might be on the incipient steps of doing just that. But the Reagan-esque phrase of tearing down walls that created the decline depends on the ARRL’s Chief Executive Officer. Read the column and see the numbers. It’s as clear as Elvis singing Blue Christmas…

Sortable Sherwood!

One of the most valuable tools for amateurs worldwide to use when evaluating HF rigs is the set of bench tests that Rob Sherwood NC0B has provided for quite a number of years now. He ranks the receive tests by his favorite metric: narrow dynamic range in dB. It’s a key for CW contest operators (pun intended) which he is in spades. But it is a frequent question from readers of Rob’s table: why can’t I sort it on another criterion? Especially if I’m not a CW contest operator?

Well, now you can! Working directly with Rob NC0B, I’ve taken his latest receive test data and made a sortable table for the Sherwood Test Results. They are circa March 5, 2022. It’s at my companion site, at this link. I plan to update it when Rob adds new radios to his Table.

I’ve also added sub-pages to illustrate some facets of the data. Based on my work over the past couple of years with adding price and consumer satisfaction data for each rig in his Table, I’ve learned that it’s important for readers to better understand both Rob’s tests and his ranking metric. In that research published in the ARRL’s National Contesting Journal, I created a composite of all nine of Rob’s bench tests which I called the Sherwood Performance Index (SPI). It is a broader assessment of receive performance than the narrow dynamic range. But it is not intended to be a replacement for Rob’s preferred metric, only a complement.

Thus far, I’ve added two interactive charts that will help the viewer better understand Rob’s table results. More may come.

One chart shows how the reader can “out-rank” themselves by ONLY focusing on how a rig is ranked on the narrow dynamic range measurement. Rob tells readers not to take the exact ranking as the only aspect of a rig for the top ten rigs are all very good on receive. This interactive graphic will allow the viewer to see how some rigs “bunch” together with almost identical narrow dynamic range but are, indeed, sequential ranked because of numerical differences that simply do not make much difference as realized in the rig’s actual performance. But, ever hear an athletic team cheer this after a game? We’re Number 10! We’re Number 10! I didn’t think so. But Number 10 might be just as good as Number 1 on the metric determining the ranking. You have to look at the data behind the ranking. This chart makes it easy.

A second chart demonstrates how Rob’s ranking variable, narrow dynamic range, relates to the composite SPI. You’ll find some interesting results from that chart, seeing how narrow dynamic range is important but there is more to some rigs than that. Especially if you’re not a contest operator, CW or otherwise.

As he has stated in various podcast interviews (including mine on the ICQ Podcast and recently on the Ham Radio Workbench), he started these bench tests for his own use as a CW contest operator. Rob disagreed with the ARRL’s tests as published in a review of the classic Drake R-4C receiver. So he created what he thought was a suite of appropriate bench tests. And the rest is history. For transceivers and receivers (“rigs”) over a 50 year period!

Here’s a trend line for the SPI by year over the horizon of rigs in his Table, circa November 2019. We are in the best period yet for receive performance in terms of Rob’s test suite. But now you can sort the Sherwood Table on any of his tests including the composite SPI that I added to asses your rig of choice.

Rob codes his website in conventional HTML. He recently had to suddenly change hosting providers. So he’s had enough on his plate with all of the other engineering contributions he makes almost daily to various email lists and groups. So while he could alter the HTML code to provide the ability to sort his table, I appreciate his spending his retirement time continuing to assist the amateur radio community as he does now. I hope that this offering of a Sortable Sherwood Table on my companion website will help the reader better understand this terrific tool as well as help Rob, too.


In a joint announcement, the ICQ Podcast team and the Ham Radio Workbench podcast team agreed to shift the ownership and management of the Homebrew Heroes Award ( to the Ham Radio Workbench team. “George Zafiropolis KJ6VU and I have discussed this over the past few months. It makes better branding sense for their team to acquire and manage this awards program. Their episode-to-episode content clearly reflects the underlying principles of the Homebrew Heroes Award,” said Frank Howell K4FMH of the ICQ Podcast team.

George KJ6VU

George Zafiropolis KJ6VU stated that “We are enthusiastic that our fellow podcasters thought of us to take on this terrific awards program. Our team has admired both the concept and the implementation over the past two years. We plan to maintain the Award into the future!” Martin M1MRB added, “We have been pleased to provide promotional support for this Award. And we will continue to promote it under the management of the Ham Radio Workbench team.”

Rod Hardmon VA3ON agreed, stating “I’m delighted to have a leadership role in this Awards program on behalf of Ham Radio Workbench. It’s a perfect fit for what we are about.” Vince d’Eon VE6LK concurred with both George and Rod by saying, “It’s a great program that we hope to take to the next level over the years by promoting those who truly make heroic efforts to show the way to build stuff in amateur radio and related areas.”

Frank K4FMH

The Homebrew Hero Award was the brainchild of Frank K4FMH during the 2019 Hamvention in Xenia, OH. It was the first time the ICQ Podcast team had visited in-person as a group. As Martin Butler M1MRB, his son Colin M6BOY, and Frank were having lunch in one of the sets of bleachers between buildings, a number of prominent homebrew makers had passed by. “There sure are some homebrew heroes here this year,” said Frank. Colin looked at him and they both knew that this concept was worthy of fleshing-out. During the tour of the famous radio station WLW during Hamvention, the three of them put together the concept and implementation.

A few months later, the first Award was given to Hans Summers G0UPL, proprietor of QRP Labs ( Colin M6BOY added, “It was a fast endeavor for Martin, Frank and I to put this together as we did. Corporate sponsors have been terrific in signing on, including Digilent, Siglent, MFJ Enterprises, and Heil Sound. The ICQ Podcast has been privileged to have Presenters who come up with innovative ideas like this.”


Frank K4FMH added, “I’ll still have a connection to this Award program as a sponsor. I’ve committed to donating a soldering iron station each year as this is the heart-and-soul of any homebrewer’s work bench. Awards programs like this take on greater meaning and importance as they transition over the years. This move to the Ham Radio Workbench Podcast team is the right move at the right time.”

Details on the Homebrew Heroes Award program in the future can be found at The current slate of sponsors are continuing through the 2022 cycle of the Homebrew Heroes Award.

Any Other Hams Near You?

As my attorney friends like to say, I was “shocked and amazed” at my answer to that question!

Ham communities vary, of course. But I suspect that you may not be as aware of the licensed amateur radio operators who live in your general vicinity. Some are simply not “active,” whatever the heck you want to say that is. We tend to see through our personal windshields rather than a bird’s eye view those hams who are engaged in some visible activity. Hearing them on the air (very strong nearby signals perhaps), seeing them at radio clubs or local ham fests, and that sort of visibility is mostly how we gauge our impressions of other hams nearby. But I suspect that many, many hams are simply not visible to us that way.

We tend to look up specific call signs through a variety of resources, the most popular of which is the venerable The results can be viewed on a map. But it is most always just the single call sign. And that is very useful. For some purposes.

But Ross KT1F in New Hampshire—his FCC record says he lives on Sleepy Hollow Road (!)–has published a very clever map of most all FCC ULS records for licensed amateurs. It’s about four years old now. As someone who has been involved in GIS and related technologies since the early 1980s, I am very impressed with KT1F’s ambitious project. Geocoding address records, especially about 750,000 of them requires either a lot of crunching against an enhanced TIGER street database (or similar source), $$$, or a clever way to use relatively free sources. See his site at to find out how he’s done this.

Here’s a screenshot of the map from Ross’ website with my location annotated. I had previously been the only licensee in the EM42xk grid. But no longer! As this graphic illustrates, there are several hams who now reside in this grid square, both on my side of the Reservoir as well as in the Fannin Landing neighborhood across the water.

Screenshot of my community from the HamInfo website (

I was very surprised at the number of hams around me. Driving by many of these neighborhoods on a daily or weekly basis, I would never know that so many had licensed ham operators living there. I just don’t see many obvious antennas. If you’d like to check out your neighborhood, here’s the website below (clicking link will open a new tab):

What did you find in your neck of the woods? Are you rather isolated? Or less isolated than you imagined?

What Can You Do With This Map?

There are a number of very useful and productive things you can do by judicious use of Ross’ map tool. Here are just some thoughts that crossed my mind.

Yep, the idea of a local area club jumps out but there are likely existing clubs if there are enough hams in the general vicinity. But it’s clearly a thought. However, contacting your neighboring hams who are close by can be good for numerous other things, too.

One is periodic gatherings in a park or other suitable area. Saturday Morning Amateur Radio Time is a “smart” move but other times work just as well. A quarterly gathering with rigs, antennas and some food/beverage can grow into a low maintenance and enjoyable collective activity. If the locale is a park listed in the Parks on the Air (POTA) map, activate it! Announcing it on the POTA app website and on their Slack channel can draw a crowd on the air. You only need 10 contacts for it to become official. And, you get to know your neighboring hams.

A careful investigation of this map in your area can identify hams who live in HOA-governed neighborhoods. If you live in one, pizza night at a local restaurant (or elsewhere) can be a welcomed time of sharing. How do others deal with the ubiquitous rules against ham antennas in their neighborhood? Perhaps if enough hams join in over time, this group can request meetings with relevant HOA Boards to just inform them about the hobby, convince them that Herman Munster really isn’t a ham (or a real person), and that ham antennas do not have to be nearly as onerous as above ground utility poles, cell towers, marinas with boat masts that have marine radio antennas on them (like mine). Plus, during bad weather or other events, having an active ham in the neighborhood can be a real asset. But, right now, they probably do not know that.

Looking for area organizations and institutions, such as libraries, schools, assisted living centers, can often give concentrations of hams ideas about public service.

Library programs can be easy to schedule as Directors are all about programs as much as books and magazines these days.

Schools? Not so much from outsiders who would take up valuable curriculum time—-unless you have an insider connection on staff at an area school. I’ve talked with numerous school administrators. They estimate that there’s only about a 3 our of 10 chance to get into a school, regardless of whether there’s a connection with a school. Private schools tend to be more challenging than public schools. The race to gain the “best” college application packet quickly fills up a middle or high school student’s dance card. Just ask any parent of one or more such school children. (They were the first Uber drivers!)

Assisted living centers vary but the ones with resident mobility could be promising for area amateurs to arrange a visit. Doing a brief show-and-tell about amateur radio could well be a boon for residents. Those who know about amateur radio, were exposed to it earlier in life, or who just get struck by the hobby’s excitement could become very interested in the hobby. Most retirement counselors suggest retiring “to” something (e.g., a hobby) instead of just “from” something (work). A Tech license and an HT courtesy of you area hams could be lifeline for one or more residents. Remember, those who are still ambulatory and get out in the community can be as active as you are! (I gave a professional friend who moved into such a center in the Chapel Hill, NC area an inexpensive HT programmed with all of the repeaters in the Raleigh-Durham area. He had maintained his amateur license for decades but the last radio he had was a 2M Goonie Box.)

Is there an RF noise problem in your area? Are their neighborhoods where area hams live where the noise is not so bad? With cooperation, pooling a few dollars into a kitty for a web-based SDR (KiwiSDR, etc.) with a loop or other broadband antenna could be used by other hams in the area for RX (CATSync is a great tool for that). Password-protect it so that just your “team” can access it if the host’s Internet bandwidth is an issue.

Getting acquainted for an “unclub” group to meet and exchange ideas on projects, contacts, events and so forth can be useful. You can also check out others to see if they are individuals with whom you feel like spending time with. The issues with clubs are legion: just read the Clubs board on eHam! But not every club has to be like Walmart. Not every ham is someone with whom everyone else would like to break bread with. Or them, you. We “should” welcome all as a general value position but, honestly, all hams do not behave that way. So meeting without the formality of an official club is often an unobtrusive way to find other area hams with whom you’d like to meet with from time to time.

Of course, your best ham buddies do not have to live nearby. Some of mine certainly do not. But I was “shocked and amazed” that so many licensed hams to live near my QTH. Perhaps you will be, too.

There are other uses of KT1F’s map tool. These are just a few I’ve thought of as I was writing this blog post. What are your thoughts?

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  • Matt W1MST, Managing Editor