Category Archives: Radio

Winter Field Day 2023 – QCX Mini Review

This weekend was Winter Field Day, an event in which amateur radio operators set up at a remote location and see how many contacts they can make. Two years ago, many hams stayed home in the mistaken belief that being in a field somehow causes COVID. To dispel that notion, I set up at a state park campground, where I operated while socially distancing myself hundreds of feet from other persons.

Last year, I operated a little bit from home, albeit with battery power, and doing my best to work only portable stations. But the name of the event is Field Day, and it doesn’t make a lot of sense to do it anywhere but out in the field. Santa Claus recently gave me a new QRP (low power) radio, the QCX Mini for 40 meters, and this was a good opportunity to put it to work.

Review of QCX Mini

QRP Labs image.

I’ve had the QCX Mini, a product of QRP Labs, a few weeks now, and I’m absolutely amazed at how well this radio works. It weighs less than half a pound, and can easily be held in the palm of your hand. It’s available for multiple bands, but I chose 40 meters, which is almost always open to somewhere, day or night. Winter Field Day is, in addition to being a fun activity, an exercise in emergency preparedness, and this tiny rig is one that you could carry with you anywhere. You just need to plug it into a key, headphones, power supply, and antenna. It’s an excellent CW transceiver, and in many ways, it’s comparable with even the best stations.

The receiver is possibly a little less sensitive than a full-size receiver at home, but it’s more than adequate for QRP use. My best DX with it so far was Austria, I was able to pull in the other station’s signal, and he was able to hear me. Additional sensitivity wouldn’t really add much.

It is, however, extremely selective, and has a narrow filter which is ideal for CW. The downside is that the filter is an analog filter permanently wired in, so it’s really not possible to copy AM or SSB signals. You can hear them, and make them out to some extent, but not very well. For example, the receiver is able to tune to both 5 and 10 MHz, and I can hear the beeps from WWV, but can’t really copy the voice messages.

In addition to the transmitter and receiver, the little radio has a built-in keyer, and even a code reader. The code reader doesn’t work quite as well as the one between my ears, but it actually does come in handy. Occasionally, I might miss a letter, but there it is, right on the screen. And if I forget a call sign before writing it down, it’s there on the screen for a few seconds until it scrolls away.

I haven’t tried it out yet, but the QCX Mini also contains a WSPR beacon that might be fun to play with. You can read the QST review of the radio at this link.

If someone wants to get into amateur radio very cheaply, and they’re willing to learn Morse Code, the QCX Mini would be a very inexpensive way to start. Completely assembled, it sells for about $120. Of course, knowledge of Morse code is necessary, but the code reader makes the learning curve a bit easier. As long as the station you’re working is sending reasonably good code, the built-in reader will help you catch all or most of what you might have missed. Even if you’re a little unsure of your abilities at first, you can get on the air right away, and build your speed up on the air, rather than having to worry about “practicing.”

In kit form, the radio is only $55, although you probably want to spend an additional $20 for the case. (But it would work fine with the printed circuit boards exposed.) If you get the models for 80, 40, or 15 meters, only a technician class license is required, and that can be done with a weekend of study (perhaps using the study guide I authored).

Winter Field Day Summary

The contest incentivizes operating away from home, so I decided to trek a bit further than my own back yard. I toyed with the idea of just sitting in a folding chair outside, but the temperature was only 5 degrees Fahrenheit, so I opted to sit inside the car for a little protection from the elements. I found an almost-empty parking lot at Como Park in St. Paul, MN, and decided to operate for a couple of hours from there.

The 40 meter band is best during nighttime hours, but I wanted to avoid sitting in the dark as much as possible. So I arrived at about 4:00 PM local time, and stayed until a little after 6:00. Most of my time there was in daylight, but with very good band conditions.

My antenna was an inverted-vee dipole. The center was held up with my trusty golf ball retriever shoved into a snowbank next to the car, and the ends were tied to the ground. Normally, I just pick up a stick off the ground and use that as a stake, but when I got there, I realized that all of the sticks were buried under two feet of snow. A search of my car found a water bottle, which I pushed into the snow to serve as an anchor at one end, and my windshield scraper, to which I tied the other end. The antenna, made of cheap speaker wire, was up in about 10 minutes. Since I was in my car, I just plugged the radio into the lighter socket. But I would normally run it with my fish-finder battery. In fact, the radio will work just find on as little as a 9-volt battery, although I’m guessing one battery would last less than an hour or so. A better compromise for small size but reasonable battery life would be 8 AA batteries or 8 D cells.

As soon as I turned on the radio, it sprang to life, and I made a total of 34 contacts over the course of two hours. You can see from my log below, the radio does get out. The log image below was made shortly after the contest and confirmations continue to trickle in, but other states worked included Texas, Louisiana, New York, and Pennsylvania, as well as Ontario, Canada. Surprisingly, I worked nothing to the west, but there are a couple of explanations. Forty meters is primarily a nighttime band, and it was still daylight to the west of me. Also, the antenna had an east-west orientation, meaning that it would get out the best to the north and south, which explains the good signal into Texas and Louisiana.

If you see your call sign here, thanks for the contact. And if you don’t see your call sign here (or if you don’t have a call sign yet), I look forward to seeing you on the air next year! Maybe by then I’ll try out QRP Labs’ QDX digital transceiver. Starting for just $69, it’s a multi-band digital transceiver. It plugs into your computer, and you can immediately start bouncing your signals off the ionosphere into other states and countries. If you get the entry-level technician license, you can use it immediately on 10 meters. While that band is very hot right now, that’s not always the case. Therefore, I would recommend also taking the test for the slightly more difficult general class license. But you’re in luck, as I’m also the author of a study guide for that test.

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1963 Stealth Antennas

It’s become a more common issue these days, but even 60 years ago, some hams and SWL’s were faced with the issue of needing to put up an antenna where they weren’t allowed. As highlighted by this article in the January 1963 issue of Electronics Illustrated, one solution, then and now, is to use an invisible antenna. The easiest way to do that, as apparently done by the owner of the antenna shown above, is to use a very thin gauge wire. The article suggested 18 gauge or smaller (larger numbers being smaller). The best choice is often enamel wire, and it is sometimes possible to select a color that matches the background, for added stealth.

I’ve discovered that one source of very cheap almost invisible wire is cheap speaker wire. Remember, when you see the price per foot, you’re actually only paying half that much, since you can unzip the wire before using it. And it often comes with clear insulation, meaning that it’s almost invisible from even a short distance away.

The magazine suggested a type of insulator to use, but modern hams have discovered that the insulator is often unnecessary. Instead, just tie the end of the wire to a piece of monofilament fishing line, which is even less visible.

The article also suggested the possibility of becoming patriotic and installing a flagpole on your house. Especially for higher frequencies, they can form the basis for an excellent antenna system.

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Book Review: War Diaries by Volodymyr Gurtovy

My friend Volodymyr “Wlad” Gurtovy, US7IGN, has published a book about his experiences living in Kyiv, Ukraine, in the middle of a war. Wlad, like me, is an attorney, and lived a middle-class existence similar to mine, until Russia invaded eastern Ukraine in 2014. He and his family then relocated to Kyiv, but with Russia’s 2022 invasion, he was once again in the middle of the war. His wife and teen son and daughter evacuated to Poland, where they were able to find an apartment, thanks in part to the generosity of friends in America and elsewhere.

He remained behind, partly because he was prohibited by law from leaving, but mostly because he felt the need to stay behind and defend his native land.

The most compelling part of his book is his account of the mundane details of life in the middle of a war. Wlad lives in a fifth-floor apartment building in the middle of a city of 2.8 million (prewar population). Some days, the supermarkets are open, and some days they are not. The mail continues to go through, but some days, it’s too dangerous to go to the post office to pick it up. Power, water, and heat are sometimes turned on, but they’re often unavailable. When he needed dental work, he was surprised to find the dental office near his home open, staffed by dental students. There are even a few accounts of his visits to court on behalf of some pro bono client. To me, the descriptions of how he navigates this dystopia are fascinating, especially since his life prior to the war wasn’t too different from mine. Many who follow this blog have an interest in emergency preparedness, and I’m sure they will also find this book compelling.

Of course, since Wlad is a ham, radio is a main character in the story. He gets much of his information from the broadcast radio, and one of his main roles has become that of radio repairman so that others can remain in touch when their radio has problems. He also recounts listening in directly to Russian pilots and both Russian and Ukrainian troops.

As the title suggests, it’s written in chronological format, and you’ll have a hard time putting it down, wondering what’s going to happen the next day.

The book is available at Amazon, as a paperback, hard cover, or Kindle.

If you feel moved to provide additional assistance to Wlad’s family, please see our crowdfunding campaign to help with their needs at GoFundMe or GiveSendGo.

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Partial Solar Eclipse of 25 October 2022

NSF image.

On 25 October 2022, there will be a partial solar eclipse over most of Europe, northern Africa, the Middle East, and western Asia. While not nearly as spectacular as a total solar eclipse, if you are in the area where the eclipse will be visible, it is certainly worth observing.

National Archives image.

Since the sun is never completely obscured, it is dangerous to look directly at the sun. However, you can view it indirectly by projecting it, as shown in this picture. You can use a pair of binoculars or telescope to do this. You do not look through the binoculars or telescope. Instead, you point the binoculars at the sun, and point the other end at the ground or other flat surface. You will then see a projected image.

While this picture shows a relatively expensive telescope, this is not necessary. A good image can be projected with even a pair of toy binoculars. See the NASA website for more ideas on viewing the eclipse. You can also view our page from the 2017 U.S. eclipse.

The eclipse will be visible first over Greenland at 08:58 UTC, and will end over India at 13:02 UTC. The peak eclipse will be visible over Siberia at 11:00 UTC. To find the exact times for your location, use this interactive map.

Those with an interest in radio will want to experience how the partial eclipse affects radio propagation. During the 2017 eclipse, I found that there was a very noticeable effect on propagation on 40 meters. Those with just a mediumwave or longwave receiver will probably discover that stations normally heard only at night can be picked up during the day, due to the eclipse.

Solar eclipses and lunar eclipses come in pairs, about two weeks apart. The corresponding lunar eclipse will be visible in North America on November 7-8.

1941 ARRL Battery-Powered Equipment Test

Today marks the 80th anniversary of an ARRL contest that, as far as I can tell, happened only one time, the 1941 ARRL Battery-Powered Equipment Test. The announcement shown here appeared in the September 1941 issue of QST, and the full rules appeared in the October issue.

While June Field Day was, and is, dominated by gasoline powered generators, this event was “aimed at individual-class lighter weight equipment.” To stress this, the official contest exchange included the transmitter weight. Participants could work non-contest stations for one point, with an extra point for sending and getting acknowledgment of the transmitter weight. If the other station was battery powered, there was an additional point for copying their transmitter weight.

In my opinion, the small advantage gained by an electric generator is more than offset by the convenience of operating with batteries. For example, as I previously reported, I worked the 2021 Winter Field Day contest with my trusty fish finder battery. Especially if you’re thinking in terms of emergency preparedness, it’s an easy matter to keep fully charged batteries on hand, whereas a generator usually requires a certain amount of maintenance, as well as keeping fuel on hand.

The maximum power level for the 1941 contest was set at 30 watts, although it would have been a stretch to get more from battery-powered equipment. Operation from the field was encouraged, with a multiplier of of 2 for all contacts. However, stations could also be operated from home, as long as batteries provided all power for transmitter and receiver. The contest rules reminded hams that portable operation required 48 hours advance notice to the FCC.

There were categories for both HF and VHF (called in those days “low frequency” and UHF). Interestingly, HF operation was confined to the daylight hours, but UHF could continue all night. The UHF category allowed 5 meters and up, but all of the entries in that category used exclusively the 2-1/2 meter band.

The results weren’t published until after Pearl Harbor, in the March 1942 issue of QST. They are shown below, with W8RMH, Edgar Cantelon of Detroit, later W8CV, taking the honors for high score with 82 contacts from a portable location. Among the calls is one familiar one, that of Don Wallace, W6AM, whom we have previously profiled.

In the “UHF” category, W2NPN took top honors, with an impressive 72 contacts from a portable location, all on 112 MHz.

The “transmitter weight” is an interesting piece of data to exchange. Even though this contest is no more, transmitter weight is still a factor in at least one contest. While it’s not sent on the air, transmitter weight is an important factor in scoring for the Adventure Radio Society Spartan Sprint contest. In the most recent running, K4PQC managed 11 contacts with a station (transmitter, receiver, headphones, and battery) weighing in at 0.1268 pounds (2 ounces). He reported that his station consisted of a 40 meter ATS-3b. The rig is designed to fit inside an Altoid’s tin, but he ran it without the case to shave a whopping 1.2 ounces off the station weight.

I suspect W8RMH’s rig weighed a bit more in 1941, but he probably used a lot of other gear, both larger and smaller, over the years. According to his 2016 obituary, he had just started working at WJBK radio (now WLQV) shortly after this contest, and he was in the transmitter room when the station reported that Pearl Harbor had been attacked. He then secured a new job in a defense plant, later becoming a radio operator for bomber test flights. He later served in the Merchant Marine as a radio operator, and then the army. He later went back to WJBK and served as an engineer for their TV station.

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Field Day 1946

This weekend is ARRL Field Day, an amateur radio operating event in which hams set up their stations in remote locations and attempt to make as many contacts as possible. It’s a hotly debated question of whether it’s an emergency preparedness exercise, a contest, or just a fun weekend. The truth is that it’s all three.

Even if all infrastructure were to be destroyed immediately, it would still be quite possible for hams to communicate worldwide using simple equipment, relying on nothing other than the laws of physics. Short of a zombie apocalypse, the need for such ability might be rare, but it’s a point of pride with hams what they can do.

1946 Field Day. QST for Feb. 1947.

Amateur radio was off the air for the duration of World War II, so Field Day 1946, 75 years ago, was the first postwar opportunity for hams to show that they could still communicate off-grid.

When the results were published, it was pointed out that comparisons with earlier Field Days were not appropriate. Hams had only recently come back on the air, and they were not yet allowed on all bands. In particular, they did not yet have privileges on the 160, 40, and 20 meter bands, all workhorses of earlier Field Days. Instead, their HF was limited to 80, 11 and 10 meters. The top portion of the 80 meter band had just been re-opened, and here were the allocations, as shown in the June 1946 issue of QST:

The top score in the 1946 event was W2FC/2, the Jersey Shore Amateur Radio Association, which netted 9621 points from a total of 809 contacts. The 27 participants had eight transmitters on the air simultaneously.

Shown above is my most recent field operation. It wasn’t ARRL Field Day, but instead Winter Field Day 2021.

Winter Field Day 2021

This previous weekend was Winter Field Day. While this event is billed as an emergency preparedness exercise, it’s also simply a fun opportunity to get on the air from a portable location, and make the most of limited resources.

As happened with ARRL Field Day this past June, the event was affected by COVID-19. Since the pandemic generally prevents operation as a group, many who would have otherwise participated stayed home. But in my opinion, being part of a group is not what defines this event. The event is not called “Group Day,” it is called “Field Day.” The focus is operating from out in the field somewhere. And while groups of people can be dangerous because of COVID, there is absolutely nothing that is unsafe about a field. I was completely socially distanced during the entire event. I saw a few other campers and said hello to some of them from 50 feet away. As I’ve previously written, camping is an excellent safe way to travel during the pandemic.

As an emergency preparedness exercise, it seems to me that it was best to adapt to the actual emergency conditions. Because of COVID, it wasn’t possible to do it as a group. But in many emergency situations, a group of helpers might not be available to set up a station and get it on the air. It seems to me that the ability to get a station on the air, even a minimalist station, without outside assistance, is a valuable skill in an emergency.

For summer Field Day, my wife and I operated for an hour or two from a city park, shown here. If it weren’t for all of the naysayers lamenting that they had to stay home for Winter Field Day, I probably would have done something similar and just operated for a while from the back yard, or maybe again from a city park. But since so many people were lamenting that it was impossible to truly go out and operate away from home, I decided to do a winter camping trip in our popup camper.

I made reservations for William O’Brien State Park, which is only a 45 minute drive from home. The temperature never got below 20 degrees, and it was actually a very nice weekend for camping. There were several other campers in the campground. I spotted three RV’s, as well as three family groups camping in tents. Also, I believe at least one of the park’s cabins was occupied. So at least a few non-hams were undaunted by being in the field in the middle of winter, in the middle of a pandemic.

Even though it’s not insulated, the popup camper stays quite warm inside with electric heaters and/or the furnace running. Since I was paying for the electricity anyway, I used two electric space heaters. One was plugged into the outlet in the camper, which was hooked up to the campground’s 30 amp circuit. The other heater was plugged into a separate extension cord going to the campground’s 20 amp circuit. Therefore, if needed, I could run both heaters full blast. When I needed the electricity for cooking, I temporarily unplugged one of the heaters. There was a light dusting of snow Sunday morning, but the camper’s canvas was bone dry by the time I folded it up.

I didn’t set out to make hundreds of contacts. In fact, after making the first one, which happened to be with Rhode Island, I felt like I had proved the concept. But I was on the air for a total of about three hours out of the 24 hours of the contest, and made 27 contacts with 14 states.

Only eight of those contacts were with other portable stations. Six were outdoors, and two were indoors but at temporary locations. I’m grateful for the other 19, who were operating at their home stations, since they gave me someone to make contacts with. But I feel a little sorry for them that they didn’t figure out some way to operate in an actual field for Field Day, even though they couldn’t do it as part of a group. Also, I was a little bit mystified to hear home stations working other home stations, while calling it Field Day. For previous Field Days when I’ve stayed home, I’ve often made some contacts, but since it’s Field Day, I’ve made a point to seek out stations who were actually in a field. There are contests almost every weekend that are geared up for home stations to work other home stations. I guess I don’t see the point of ignoring those opportunities, and then getting on only for a weekend called Field Day. Again, I was grateful that I had stations to work, but I really didn’t get the point of home stations spending the whole weekend working other home stations.

My original plan was to use dipoles for 20 and 40 meters, along with a quarter wave wire for 80 meters. The 80 meter wire was a bust, and didn’t really get out, due undoubtedly to its very low height and lack of much of a ground system. But the dipole for 20 meters did a great job, and I made all of my contacts on that band. You can see (just barely) that antenna at left. It’s held up at the center, inverted-vee style, with my telescoping golf ball retriever, and the ends are tied loosely to some bushes that happened to be at about the right spot. I was running low on wire before the contest, so I ordered a roll of speaker wire that did the job. I cut it to the proper length of about 16-1/2 feet, and then unzipped it when it was in place. I thought I had forgotten to bring a tape measure (it turns out there was one in the toolbox), but I used a six-inch ruler to measure the table, and then used the table to measure the wire.

My original plan was to put up a 40 meter antenna as well, but when 20 meters closed in the early evening, I decided to simply call it a night, and made a few more contacts Sunday morning. As with most of my NPOTA activations, I operated mostly CW, but also made a few SSB contacts. I also made one PSK-31 contact using my tablet computer and the DroidPSK app.

My station consisted of my Yaesu FT-817 powered by a fish-finder battery, which still had plenty of charge left at the end of the contest. The one digital contact was made possible with the Signalink USB interface, which performed flawlessly with the inexpensive RCA tablet computer. For some reason, the tablet’s keyboard didn’t work very well with the DroidPSK software, so I had to use the touchscreen, which seemed like a rather laborious process to me. I probably could have made the process much easier by setting up some macros in advance. But for the first time using it, I was glad that I was able to make my first ever portable digital contact.

As you can see in the picture above, I needed something to prop up the radio on the table, and a box of matches did a perfect job with this important task.

Am I going to save any lives with my ability to operate a portable station? Almost certainly not. On the other hand, if there is ever an emergency, large or small, that makes other forms of communication impossible, I know that I am able to send messages to friends and relatives in other states. I can do it formally by checking in to a National Traffic System net, or I can do it informally simply by working someone and asking them to make a phone call or send an e-mail for me. I can also do that for neighbors who want to let their friends in other states know that they’re safe. I’m also well equipped to receive information from the outside world simply by knowing that I can power up a broadcast receiver to listen to either local or distant stations. It’s unlikely that I’ll ever have a need, but it’s good to know that I have the ability.

The point of exercises like Field Day is to show that hams can adapt to emergency situations and still be able to communicate. COVID has shown us that there are some emergencies where you are cut off from the group that normally helps you establish communications. Can you adapt and still communicate if you are cut off from both this group and your normal station setup? Field Day and Winter Field Day during COVID gave me the opportunity to show that I can.

Here’s a short video tour of my setup:

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1940 RCA Ad

This ad showing RCA’s product lineup for 1941 appeared 80 years ago today, in the October 21, 1940, issue of Life magazine.

For those on a budget, the model 45X-1 for $9.95. The ad bills that set as having one police band, but in reality, it covers the broadcast band but with a bit of extended coverage to pull in police calls in many areas.

The most expensive of the table radios shown is the 18T for $49.95. That 8-tube set featured six pushbuttons and two shortwave bands for pulling in the war news from Europe. At the top of the line of the tabletop radio-phonos was the V-102, a 7 tube set which appears to be broadcast only, for $59.95.

For a larger view of the ad, from most browsers, click twice on the image.

Drive-In Educational Programs and Meetings for COVID-19

I’ve previously written about why I believe outdoor spaces should be utilized for learning and other group activities during the COVID-19 emergency. Since I’m in the business of providing continuing education programs for attorneys, a few weeks ago, I presented an outdoor program at a city park.

The weather for that program was excellent, and everyone enjoyed the opportunity to be outside. However, the weather can be unpredictable, and it won’t always work to be outside. For that reason, today, I presented a live drive-in program in a parking lot. The attendees watched from their car, and listened on their car radio. If there had been questions or feedback, they could have phoned me at any time.

Why a Drive-In Program?

It was a bit more work, and it would actually have been more pleasant to just get out of our cars and do it outside, as with the previous program. But a drive-in program is a very viable option for any group that needs to be meet in person, since the weather won’t always cooperate completely.

I didn’t bring it today, because the weather was nice, but if there had been a chance of rain, I would have brought a canopy such as the one shown here. For an outdoor presentation of any kind, the speaker obviously needs to dress for the weather. But the attendees can take advantage of their car, or even run the car for heat or air conditioning if needed.

My transmitter was the InfOspot Talking House transmitter, which I previously reviewed. As expected, my transmitter easily covered the parking lot. I parked near a tree, and tied the end of the 10 foot antenna to a convenient branch. I should have tested everything, since the audio quality wasn’t quite as good as I had expected. In most of my tests at home, I fed the transmitter with an MP3 player, and the audio quality was absolutely astounding. Today’s audio quality was quite good–certainly good enough for a lecture. But if the transmitter was used for any kind of musical presentation, it wouldn’t have been quite good enough. I’ll need to experiment with a different mike, or possibly run the existing mike through a preamp and feed the auxiliary input rather than the mike input. (The audio quality through the line-in jack is excellent, so if you’re broadcasting from a location where another PA system is in use, that’s the best option, but you will need an inexpensive isolation transformer to prevent 60-cycle hum.)

Caveat Emptor: The Importance of a Legal Transmitter

When buying a transmitter, it’s important to buy a transmitter that is legal. Unfortunately, most of the transmitters in use for drive-in events these days don’t appear to be legal. In particular, it would be very difficult to use a legal FM transmitter for an event such as this, because FCC rules (section 15.239) limit the transmitted signal to an extremely low level. Amazon and eBay are full of FM transmitters that claim to be legal for unlicensed use, but even a cursory examination of their specifications reveal that their power level is many times what is allowed. On the other hand, the rules governing AM transmitters (section 15.219) are much less restrictive. The Talking House transmitter is certified as complying with this section of the rules, and has a very good range for this type of use. It is, therefore, the transmitter that I recommend for this application. Chances are, nobody will complain to the FCC. But if they do, and especially if there is interference with aircraft communications, which are near the FM band, the fines are typically in the range of $10,000. It’s best to use a transmitter that you know is legal, and the Talking House is.

Here’s another writer who agrees with me that most FM transmitters used for this purpose are illegal. As he puts it, they are all lying when they say on eBay or Amazon that they are legal. And in my experience, as both a lawyer and a licensed radio engineer, he’s right. Some of the listings claim that the transmitters are FCC certified. In some cases, the certification appears to be for use by a licensed radio station. In one case, the transmitter appeared to be certified for unlicensed use. I checked the FCC website, and sure enough, there was a report from a Chinese lab certifying that the transmitter was compliant. The report even contained test results showing compliance with some of the requirements. But noticeably absent was any report showing that the transmitted field strength was compliant. It couldn’t have been, because the transmitter was using hundreds or thousands more times power than allowed. It appears than an overworked FCC simply failed to notice that this critical measurement was missing from the report. Let the buyer beware. Just because an eBay listing says that a product is legal doesn’t mean it’s legal.

A Good Way to Conduct In Person Meetings

As with my previous program, we could have just as easily done it over the phone, or via Zoom. But some activities are best done in person, and after a long quarantine where everything has been done remotely, it’s refreshing to interact with others in person, even if they are six feet away and/or on the other side of a windshield. Creatively making use of outdoor locations, whether it’s for business, education, or worship will serve an important role until things get back to normal. And history tells us that yes, eventually, things will get back to normal.

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1970 Multiband Mobile Antenna

This month marks the 50th birthday of a pretty good idea, as evidenced by the cover story in the August 1970 issue of Popular Electronics. The article was penned by Russ Alexander, W6IEL, who was likely the originator. The article specifically addresses how to use a compact antenna from an apartment, and it makes use of Hustler mobile antennas.

The Hustler antenna is still available today, in more or less identical form. It amounts to a center loaded vertical antenna. The bottom half is a mast that attaches to the car. On top of that is a loading coil, and on top of that is a whip antenna. The loading coil and whip are tuned to a specific band. And because you need different coils and whips for different bands, the coil and whip are sold as a one-piece resonator.

So it’s fairly easy to change bands: You stop the car, get out, and swap out the resonator. But that doesn’t work very well if the antenna is mounted on the roof of your apartment building. And it doesn’t work very well if you want to change bands without getting out of the car.

So the author went to his metal shop, and made a piece which allowed him to mount up to four resonators on the same mast. For bands that are not being used, the coil acts as a trap, so the unused resonators have little impact on the transmitted signal.

The idea caught on. I first remember seeing one of these as a young ham in the 1970s in the parking lot at a hamfest on the car of prominent Minnesota ham Tod Olson, K0TO (then W0IYP). I remember thinking that it was a pretty good idea. Chances are, it originated with the magazine article shown here.

Shown in these pictures is the mobile antenna of W6LEN, an avid WWFF activator of Southern California parks and beaches. He uses the Hustler mobile antenna on a magnetic mount on top of his minivan. While the magnetic mount is probably too small to use in motion, he has had good success with this antenna, and it takes only a few minutes to deploy when he arrives at his destination. As with the 1970 article, he uses a homemade bracket to mount the four resonators.

Hustler eventually realized that using multiple resonators was a good idea, and they now sell the part, shown at right, so you don’t have to have your own metalworking tools. The author of the 1970 article recommended having the part plated with copper and then cadmium, after which “the finished bracket will look like a commercially marketed item.” The 1970 Popular Electronics version had room for four resonators, whereas the commercial product has only three wings. However, a fourth resonator can be added in the middle.

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