Category Archives: Camping

1921 Recreational Vehicles

1921MarPM1This early proto-recreational vehicle was shown a hundred years ago in the March 1921 issue of Popular Mechanics. The magazine notes that this vehicle, called an “auto-bungalow” was “the culmination of a movement which had been growing ever since the motor car became a reliable means of transportation. It ancestor was the two-wheeled homemade camp trailer, designed to carry the tents, bedding, and other simple requisites of a two-weeks period of “roughing it” in the woods or at the shore.”

The early RV shown above was not cheap. According to the magazine, the total cost was $16,000. According to this inflation calculator, that would work out to almost a quarter million in today’s money, a figure that’s not surprising, since many top-end RV’s are available today in that price range. The vehicle, including the rear porch, had an overall length of 30 feet. As is apparent, it required an abnormally long overhang at the rear, but the magazine pointed out that this was an advantage, since it put most of the weight on the rear axle, providing better traction and making steering easier. The interior living quarters measured a respectable 8 by 20 feet, which included a kitchenette with ice box, stove, hot water tank, and fireless cooker. It included toilet facilities and 22 incandescent lights powered by battery and generator.

1921MarPM2

 

As is the case today, not everyone could afford such a top-of-the-line luxury RV, and the magazine pointed out a number of options for the more budget conscious. For example, the “20th century prairie schooner” shown at left was constructed at reasonable cost by a Kansas City resident. It was built on the chassis of a popular make of light car, with the wheelbase extended several inches. The even simpler equipment shown to the right 1921MarPM3was designed by a Maine resident at a total cost of $312, including two new tires. This family of six cooked most of their meals on campfires.

 

Modern tent trailer for motorcycle or small car. Amazon photo.

The tent trailer shown below is similar in concept to some modern motorcycle camping trailers. According to the magazine, a number of such trailers, with either two or four wheels, were readily available for purchase, for the benefit of those with “neither the leisure nor the ingenuity to originate and build outfits.”

1921MarPM4



Winter Field Day 2021

WFD1This 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.

FD1For 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.

WFD2I 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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COVID-19 Travel

Custer State Park, SD.

Custer State Park, SD.

One segment of the economy that has boomed due to the pandemic is anything involving the outdoors. Americans have discovered that outdoor activities are a safe source of recreation. One industry that has seen a particular boom is the recreational vehicle industry. According to this recent article, RV sales in July were higher than they had been in 40 years. And campgrounds, whether it is state parks or private campgrounds, have been packed.

This is understandable for a few reasons. First of all, I for one, am not about to get inside a pressurized tube with a bunch of strangers, so it’s unlikely that I’ll be taking any commercial flights any time soon. Similarly, it will probably be a long time before the cruise industry rebounds. So the best choice for long distance travel is driving, and an RV allows one to not worry about the cleanliness of a hotel room.

And there’s another factor at work. Millions of Americans are working remotely, and their kids are attending school remotely. Since they don’t have to show up at work or school on Monday morning, many of them realized that they could go to work and go to school from the road, as long as they had an internet connection. That’s exactly what we did recently. We waited until after school started, and then took a working vacation to Yellowstone. I would have preferred to do it in a $100,000 diesel pusher motorhome, but we don’t happen to have one of those. What we do have is an 8 foot popup towed behind our minivan, and we decided to use that.

Staying Connected on the Road

In campgrounds, we saw quite a few people, adults and children, sitting at picnic

Boost Mobile Coverage Map.

Boost Mobile Coverage Map.

tables with a laptop. So I assume that they, like us, were at work or at school. We stayed mostly at KOA campgrounds, most of which have very good WiFi connections. When we were driving, or in state park campgrounds, we used a cell phone hotspot to connect. While our connections sometimes failed, they were reliable most of the time. There were a few occasions when we had a meeting that we absolutely had to attend at a certain time, and

Verizon Coverage Map.

Verizon Coverage Map.

Cricket Mobile Coverage map.

Cricket Wireless Coverage map.

on those occasions, we did need to plan ahead a bit. Overall, we found that Verizon had the best connections in the Western states we visited. For example, in Yellowstone National Park, Verizon had service available near all of the major centers.  Between the four of us, we had three cellular providers, and Verizon was the most reliable where we were.  My phone, which uses the prepaid provider Boost Mobile, which uses the Sprint network, had absolutely no service for most of the trip.  I looked at their coverage map after the fact, and while they have very good coverage in the eastern half of the country (especially along interstates), they have essentially zero coverage in much of the Intermountain West.  My kids both have service with Cricket Wireless, which uses the AT&T network, and they also had good coverage in most areas.  Verizon seemed a bit more reliable, but there were a couple of occasions when they had service but my wife’s Verizon phone did not.

If your work depends on having internet available, the moral of the story is that you should plan ahead.  Between our three providers, we had very reliable service.  But occasionally,  the best provider was unavailable, but another one was available.  One workaround to increase your reliability if you have only one provider would be to buy a cheap prepaid phone from another providers.  If both your primary carrier and that carrier have reasonably good service in the area where you plan to travel, you’ll increase your chances of having a good connection from any given spot.  Phones are available for about $60 or less, and a month’s service is generally about $30.  The inexpensive plan might run out of data, but you can generally buy more.  Having a second cell phone with a different provider could be good insurance if you need coverage.  You can turn either phone into a hotspot and use that for your other devices.

Prior to the trip, we did buy a dedicated hotspot with Verizon service, but it didn’t seem to provide any better service than the Verizon cell phone.  And unfortunately, the hardware stopped working during the trip, and will have to be returned.  Frankly, I don’t think there was any advantage over simply using a cell phone as a hotspot.

Inside Yellowstone Park, there was cellular coverage near all of the major destinations, such as Old Faithful, Fishing Bridge, Mammoth Hot Springs, etc.  On one occasion, we were touring the park when my wife had a Zoom meeting to attend.  We stopped at Fishing Bridge, where she had a good signal, and she worked in the car while the kids and I viewed the sites.  However, when we strayed even a few miles from one of these sites, there was no service. Our base of operations during our stay at the park, the West Yellowstone KOA, had very good WiFi.  So we generally attended school and work from the campground in the morning, and then toured the park without regard to connectivity.

There were a few times when the kids simply missed a class because an internet connection was unavailable.  So you need to be flexible, and if you have an important meeting you need to attend, you need to plan to be in a place with a solid connection.

Social Distancing on the Road

Family dinner at Mammoth Hot Springs, Yellowstone, of buffalo burgers purchased at food truck outside the park.

Family dinner at Mammoth Hot Springs, Yellowstone, of buffalo burgers purchased at food truck outside the park.

We are being very careful with social distancing, and the trip had few challenges. We recognized beforehand that there would be some situations where we would have to go inside buildings to interact with others, although we kept those situations to a bare minimum. When we did need to go inside and/or interact closely with others, we wore KN95 masks, which provide some protection to the person wearing them. I’d feel better if I had an N95 mask that was made in the USA, but those aren’t available yet. Camping does not always allow the opportunity to wash your hands thoroughly with hot water, so we also brought along and used plenty of hand sanitizer. In addition to the N95 masks, we always had with us either a cloth mask or a disposable surgical mask.

I would say that about half of the people we saw were wearing masks when it was appropriate to do so.  Buildings inside the national park required masks, and most were honoring that requirement.  A few people had what appeared to be N95 or KN95 masks. Most had simpler cloth face coverings.

For the most part, other people we encountered respected our social distance. In campgrounds, when we talked to other campers, they instinctively kept their distance. We did have to keep up our guard, however, since others would sometimes decide to intrude upon our personal space. For example, at Old Faithful, my daughter and I were holding a spot at a bench for the rest of the family when an unmasked woman simply came to our bench and sat down a couple of feet away from my daughter. There was little we could do other than move as far away as possible from her, tighten our masks, and try to breathe in the other direction.

At Mount Rushmore, I was sitting minding my own business when an elderly woman, in an apparent effort to impress her granddaughter, started hopscotching toward me. I held my breath, quickly got up, and found another place to sit.

Buying Supplies on the Road

Cody, WY, Walmart. Google Streetview.

Cody, WY, Walmart. Google Streetview.

Without exception, when we bought gas, we paid at the pump and didn’t have to go into the store.  Since the process did require handling the pump and entering a zip code on the display, I made a habit of slathering my hands with hand sanitizer when done.

For an almost two week trip, we did have to buy groceries. To avoid having to go into the store, we placed an online order at Walmart, and picked up our order at the Walmart in Cody, Wyoming. In most cases, it’s necessary to place an order about two days in advance, so this requires some advance planning. But we placed the order from a cell phone while driving, and later added some items we thought of.

One good resource for buying things on the road without direct contact is Walgreens. The Walgreens website allows you to order a limited selection of items, and pick those up at the drive-thru window. In one case, we needed a charging cable for an iPad, which wasn’t listed on the website. But when we called the store, they were happy to leave it at the drive-thru, and we were able to pick it up a few minutes later.  For staples like bread and milk, you can place your order online, and then pick it up and pay at the window.

Most (but not all) major supermarket chains have online ordering for in-store pickup. In many cases, the service is through InstaCart, and their website will show available stores in the area where you are travelling. Walmart’s ordering is done directly through their website, and as far as I know, all Walmart stores offer curbside pickup.

Sanitation Resources

As the song goes, “it’s a problem to be faced, what to do with human waste.” This is one great advantage of traveling in a larger RV with its own toilet. In our case, we have a small portable toilet in the camper, like the one shown here, which is really best for emergency situations. And it also needs to be emptied by going into the bathroom.

In some cases, the only option was a public restroom, which meant using the KN95 mask. After using the bathroom, I washed my hands thoroughly, but I usually had to touch the doorknob before leaving. So my routine was to stop outside the restroom, apply hand sanitizer, and then remove my mask.

One advantage of state and national parks is that they often have what are euphemistically called “vault” toilets, or pit toilets. To the squeamish, these might seem to be less than ideal. But in general, they are kept clean. And they have the great advantage of providing automatic social distancing. You are isolated from everyone else, so there’s no chance of breathing in a virus exhaled by the person in the next stall. In general, if I had the choice between a “vault” toilet and a “modern” restroom, I opted for the vault, since I believe it is safer. At one of our campgrounds, the campground had a “modern” restroom, but there was a picnic area about a mile away with a rarely used vault toilet.  I made the short drive to take advantage of the added safety.  I also took advantage of the vault toilets to empty our portable toilet, a job that for some reason always devolves upon me.

In many cases, such as state parks, a vault toilet is available in the campground.  So even if you’re not camped there, a drive into the campground will allow you to find this facility.

Many locations, such as Mt. Rushmore, had a bank of portable toilets set up, even though the modern restrooms were in operation.  Again, even though it sounds counterintuitive, it seems to me that the portable toilet, where you are isolated, is safer than a public restroom.  I did notice that this toilet was out of hand sanitizer, so you do want to carry a small container with you at all times.  I kept mine stored in a fanny pack, along with my KN95 mask, stored in its own paper bag.  (Here is CDC guidance on re-use of “disposable” masks.)

To avoid public showers, we did have a solar shower and shower tent which we used a couple of times.  The shower is designed to be hung from a tree, although we found that the most convenient option was usually to put it on the roof of the car.  (For more information about solar showers, see my earlier post.)  It did prove to be an inexpensive and convenient option.

One thing that I noticed, particularly in Yellowstone National Park, was the huge number of rental RVs. We must have seen hundreds of motorhomes with a prominent ad for CruiseAmerica.com. They aren’t exactly cheap, but the cost is comparable to a hotel room. If one doesn’t own an RV and wants to travel, this seems like a viable option.

I’ve never been to Yellowstone National Park in the fall, but it did seem to be quite crowded for the off season. The crowds weren’t an issue, but I believe they were higher than usual, since others probably had the same idea we did. For most of the nights of our stay, we did have campground reservations, and most of the campgrounds where we stayed appeared to be full or almost full.

My experience with the Minnesota State Parks is that if you want to go camping, you’ll find many options available during the week. If you’re flexible, you’ll find many interesting places to camp. On weekends, there are fewer options. Previous years, I’ve almost always been able to find a weekend camping spot on very short notice. This year, that might not be possible on a weekend, but it still is on a weekday. I suspect other states are the same. The campground host at Custer State Park in South Dakota said that this year, the campground is full almost every night, whereas in previous years, there were often spots available.

Every segment of the industry seems to be at its limits.  We had recently purchased a new vehicle and had to have a hitch installed.  The dealer who installed it (Bauer’s Custom Hitches in Minnetonka, MN, which did an excellent job) was unable to get the hitch from their normal supplier.  I eventually found one at O’Reilly Auto Parts, which had the right hitch in stock locally.  The dealer was so surprised that I found one that they bought them retail for the other customers who were waiting for the same part.

We were gone for about 12 days, and traveled from Minnesota first through North Dakota and Montana to Yellowstone, and then back through Wyoming in South Dakota. In retrospect, we should have stayed put at some of those sites a few more days, rather than driving so much. Since we can, we’ll probably take more similar trips this year, but probably put in fewer miles. The $100,000 diesel pusher would probably provide more convenient options for four of us to be working or going to school. But since we don’t have one of those, the 8 foot popup seems to work almost as well.



Camping With the Phonograph: 1920

1920JuneTalkingMachineWorldA hundred years ago this month, the June 1920 issue of Talking Machine World carried this ad for the Columbia Grafonola phonograph, and reminded readers that the joys of vacation are redoubled when music is brought along.

The compact instrument in its traveling kit could be tucked away safely in any corner of an automobile, motor boat, or even canoe. It stayed out of the way until needed for the latest music for dancing.



Old Town Canoes, 1920

Canoex
1920MayPSAs a major Internet publisher, OneTubeRadio.com owns a company vehicle, shown above.  Specifically, it’s an Old Town Pathfinder canoe.  The company has been in business since 1898, and going strong for at least a century, as shown by the ad at the left.

The ad appeared in Popular Science a hundred years ago this month, May 1920.

Maybe we’ll write to them and ask if they still have any constitutions and by-laws.



1949 Simple Camp Stove

1949AprPM2Seventy years ago this month, the April 1949 issue of Popular Mechanics showed how to make this quick and dirty camp stove out of a coffee can. After punching some vent holes, sand was placed in the can, which was soaked in “gasoline or fuel oil.” The magazine cautioned not to add fuel without waiting for the sand to cool off.



Rolite Trailers, 1969

1969AprPMThis ad for Rolite trailers appeared fifty years ago this month in the April 1969 issue of Popular Mechanics. The Rolite was a solid-walled trailer that folded down. A 12-volt electric motor raised the roof and front and rear walls. The side walls were then raised manually, after which the roof was jogged down a couple of inches to lock everything in place.

Rolite was originally manufactured in Grantsburg, Wisconsin, in the mid-1960’s.  By the time this ad appeared, they had become part of Larson Industries, 5000 Normandale Rd., Minneapolis.  More information on the Rolite can be found at this Facebook group.

The ad was part of a 30-page supplement on camping, which also included the ads shown here:

1969AprPM21969AprPM3

The first is for a 5 horsepower motorbike kit (with optional ski), with a name familiar to regular readers, namely Heathkit!  You can read more about the GT-18 at this link.

The second ad is for a class of product that has largely ceased to exist, namely, inexpensive, lightweight, no-frills tent trailers.  They still exist, but most are marketed as motorcycle tent trailers.  However, there’s no reason why one can’t be pulled behind a car.  While I don’t think they are available in the U.S. any more, shown below is the 1980’s era Danish made Combi-Camp trailer we owned for a few years.  Its empty weight was only a couple hundred pounds and could easily be towed by any car.  Most importantly, it allowed you to camp but sleep off the ground, which is a huge luxury, but provided even by the simple trailer shown above.

For more information about the Appleby trailer shown in the ad, see this link or this Facebook page.

CombiCamp



Expedient Sled

1944FebPS
If you’re ever stranded in the wilderness in winter with an injured companion, then this idea could be a lifesaver. The February 1944 issue of Popular Science showed how to construct this expedient sled from a Chippewa design.

The magazine explained that ash was the best wood to use, since the green wood would bend without breaking.

The sled was lashed together, and the magazine explained that if you had no cord, you could use strips of ironwood bark. Or, if you were using the sled to haul your injured companion, you could use the laces from his boots.



Toasters for Camping and Emergency Preparedness

Another Atlantic hurricane serves as a reminder of the need for emergency preparedness. Any number of emergencies can cause the power to go out, and if that happens, you’ll want your life to be as comfortable as possible.

Each year during hurricane season, our web page on making coffee without electricity gets lots of traffic. And there’s another electric appliance that people take for granted: The toaster.

The lack of electric power doesn’t mean that you have to give up making toast, since there’s an extremely inexpensive camping toaster available. I assumed that everybody knew about these, but the existence of this product often comes as a surprise. So whether it’s for camping trips or emergency preparedness, you might consider investing just a few dollars for one of these devices.

This toaster is nothing more than a metal plate that sits on any source of heat. You can use it on the stove at home or a camp stove. You can also use it on a charcoal grill or campfire. As long as you have a source of heat, you can make toast. Four wires fold into a frame, and you lean up to four slices of bread against the wire.

This kind of toaster only does one side of the bread at a time, so you will have to flip the bread halfway through the toasting process. But other than that minor inconvenience, the result is toast identical to what comes out of your normal electric toaster.

In addition to making toast, this toaster will cook anything that goes in your electric toaster. So it’s also good for things like Pop-Tarts, bagels, and English muffins.  Other foods such as Toaster Strudels and Toaster Scrambles don’t need to remain frozen, and can be stored in a cooler for a few days.  Therefore, with a camp toaster, these can be used for a very convenient hot breakfast.

Here are some of the available camp toasters on Amazon:

 



Wood Burning USB Charger

We recently featured a 1958 Soviet kerosene powered radio and lamented the fact that similar products are not available today.  It turns out, however, that we were wrong.

LufoFirst, a Facebook comment to our original post alerted us to the Lufo lamp, shown here.  This is a kerosene lantern, apparently developed as part of a UN project to provide radio receivers for Africa.  The heat from the lamp operates a Peltier effect device which powers the built-in AM FM radio.

These don’t appear to be manufactured currently, but they are reportedly available in Europe if you look hard enough.

There is, however, one device on the market currently, and it doesn’t even require kerosene!  At Amazon, you can purchase a wood-powered USB charger that uses the same principle. You can then charge your phone using sticks gathered from your yard.

The USB charger appears to be a bit of an afterthought, but also appears to be fully functional. It appears that the Peltier device power supply is intended mostly to power an internal fan that increases the efficiency of the stove. But it also provides usable power, which is available from the USB socket.

The stove also includes an internal 2600 mAh lithium-ion battery to store the charge. According to the Amazon reviews, the stove itself works extremely well.  According to one review, the stove will boil a pint of water in about four minutes, which is quite good for a stove burning nothing but small twigs.   The stove is useful for charging a phone or other device. The fan speed appears to be a trade-off. With the fan on high speed, the stove runs most efficiently, but it also uses most of the current that is produced. It appears that the best compromise for generating electricity is to run the fan on low speed.

For the do it yourselfer, it seems that producing a similar device should be relatively easy and inexpensive.  The Peltier elements are readily available on Amazon.  You can also order direct from China with free shipping at this link.  They’re normally intended for use in applications such as 12-volt coolers, where an electric current is run through the device, where it produces a difference in temperature between the hot side of the device and the cold side.  But this is a case where the physics works the same with a minus sign in front of the equation:  If you generate a difference in temperature, this will cause electric current to flow.

You’ll probably need more than one, and you’ll probably have to experiment with wiring them in series (to increase voltage) and parallel (to increase current) to get sufficient power.  You’ll also need some kind of heat sink mounted on the cold side.  The device will have maximum output when the temperature difference between the two sides is greatest.  So you need to get one side as hot as possible while keeping the other side of the thin device as cool as possible.

Once you have sufficient voltage and current, you can hook the output to a 12 volt USB charger.  Even if you don’t have a full 12 volts, most such chargers are little more than a voltage regulator, so as long as your output is more than 5 volts, you should have a fully functional USB power connection.

To use your new power supply to listen to the radio, you could add the small portable shown here.  When batteries are available, you can use standard AAA batteries.  During the day, you can run it with the built-in solar cell.  And at night, you can plug it in to your wood burning charger with its USB port.

Of course, most of our readers will want to listen to shortwave, and will probably opt for this inexpensive USB-powered receiver  which tunes AM, FM, and 4.75-21.85 MHz shortwave.

In addition to being useful for camping or emergencies, such a project would be excellent for a science fair project.