Category Archives: Radio history

1953 Audio Amp/Phonograph/Radio

Seventy years ago, this young man is enlivening the family picnic by trying his voice on the mike of this project from the July 1953 issue of Popular Mechanics. The project is billed as a “just for fun” audio amplifier, but it’s actually quite a bit more. In addition to the two-tube battery operated audio amplifier, the project contains provisions for a crystal microphone and phonograph input from a spring-wound record player. It’s not an early prototype karaoke machine, because you can use only one at a time. But the magazine notes that it’s a lot of fun in a group for everyone to try their voice on the mike. It notes that almost everyone talks too fast, some get mike fright, and others use an unnaturally high pitch. It noted that placing the mike was an art, and the set provides a good opportunity to learn a lot about PA systems.

And in addition, the circuit included a built-in germanium diode crystal set which would pull in clear signals from local stations.

1923 Radiola II for the Farm

A hundred years ago, the radio was becoming a reality on the farm, as shown by this article appearing in the July 18, 1923, issue of the Cody, WY, Northern Wyoming Herald. The article appears to be a press release taken directly from GE, extolling the virtues of the Radiola II receiver. At a mere 18 pounds, the battery set could pull in stations as well as larger sets.

Radio Engineering Cadettes, 1943

Eighty years ago this month, these two young women were learning the finer points of voltage indicators under the tutelage of this Purdue University engineering professor. They were “Radio Engineering Cadettes,” and were paid trainees at RCA.

As you can read here, 86 women from 17 states began the 44 week program in 1943. Because of wartime labor shortages, they were the first women to attend the engineering school. The picture above appeared in the July 1943 issue of Radio Retailing.

Getting QSLs: 1923

Getting QSL cards in the mail has traditionally been an exciting part of Amateur Radio, as immortalized here on the cover of QST 100 years ago this month, July 1923.

The artist is Clyde Darr, 8ZZ, who provided at least 69 such illustrations for the magazine prior to his death in 1929 at the age of 50.

1938 Dining Table Radio

Eighty-five years ago, the July 1938 issue of Popular Science showed how to make this handsome radio to proudly put in the middle of your dining room table. The five-tube (really four tubes plus a ballast) TRF was said to be a good performer. The sides were decorated with mirrors, and it also had two flower holders. They were made of plywood, with a cut down tobacco tin inside to allow you to water the flowers.

Apparently, combination radio-flower pots are no longer a thing. The one at the left certainly looks pleasing, but it’s not really a radio. Apparently, the closest you can get today is the combination flower pot-bluetooth speaker shown below. In addition to using it as a normal bluetooth speaker, you can set it to make piano sounds whenever you touch the flower.

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1923 Distance Learning

Distance learning is nothing new, as shown by these New York high school students 100 years ago, pictured in the July 1923 issue of Popular Science. While the magazine identifies the school as “Haarken High School” in New York, this is almost certainly a typo, and it should read Haaren High School, as confirmed by this site and others reporting the same accomplishment.

This is the accountancy class at Haaren, and the students are listening to a series of accountancy problems broadcast by WJZ in Newark, NJ (now WABC New York). A receiver and loudspeaker had been installed, and the students are seated at their adding machines. Problems were read slowly and distinctly, and the correct answers were read a few minutes later. “The general correctness of the classroom work was testimony of the clearness with which radio waves carried.”

Witnessing the successful demonstration are officials of the city Board of Education, as well as more than 25 principals of city high schools.

1948 Safety Radio

Seventy-five years ago, this young man was safe listening to the radio unattended, thanks to the “safety radio”. As we’ve reported previously, most radios of that era had a “hot chassis“. One side of the line cord was connected to the metal chassis. The connection did go through a capacitor, but those were known to short out. Depending on which way the cord was plugged in, the result could be a 120 volt shock if you touched any metal on the radio and a grounded object. In this safety radio, the set was safely housed in a one-piece plastic cabinet. The description notes that there is ample provision for required cooling, and there was a handle for convenient portability.

I would be curious to know whether there are any screws on the bottom. And if one of the knobs fall off, the volume and tuning controls are probably made of metal and attached directly to the chassis. The magazine, July 1948 Popular Mechanics, doesn’t name the manufacturer or the model. Maybe one of our readers could identify it.

1948 One Tube Portable

The plans for this nondescript by effective one-tube portable radio appeared in Practical Wireless, July 1948. The set uses a 6K7 pentode, and uses a singl 4.5 volt battery as its power source. According to the author, F.G. Rayer, G3OGR, the set would pull in local stations with just a short piece of wire. With a longer outdoor antenna, it could pull in foreign stations, although lack of selectivity limited its usefulness. The power switch and band switching was accomplished with three terminals on the front of the radio. For longwave reception, terminals 2 and 3 were shorted out. For mediumwave reception, all three terminals were shorted, effectively shortening the coil. For mediumwave reception only, another coil could be substituted.

According to the author, “it should be unnecessary to point but that the receiver is intended mainly as a novelty, but that even so it is capable of surprising results under certain conditions.”

Keep Your Radio Working: 1943

Eighty years ago, domestic radio production had been shut down for over a year, and there would be no new radios for the duration of the war. Therefore, it was every American’s patriotic duty to keep their current radio in working order.

In this ad in the June 1943 issue of Radio Retailing, the makers of Tung-Sol tubes was making available to dealers this display of booklets, containing hints for consumers on how to keep their radio working. The ad noted that many Tung-Sol tubes were available to dealers, so that if repairs were needed, they were probably possible.

Field Day 2023: Greenberg Island, Wm. O’Brien State Park, MN

This past weekend was ARRL Field Day, an operating event in which Amateur Radio operators set up in the field and see how many contacts they can make with portable equipment. It’s mostly a fun activity, but it also serves as a test of emergency capabilities. For many, this involves hauling large equipment, often powered by a gasoline generator, and setting up large antennas. Often, large groups are involved in these operations. It’s been around since 1933, so this year’s running marked the 90th anniversary.

I prefer a simpler approach, and set out by myself or a smaller group with equipment that I can easily carry and quickly set up. This year, instead of just driving to a park, I decided to operate from an island accessible only by boat. In particular, I operated from Greenberg Island in the St. Croix River, part of William O’Brien State Park, Minnesota. The plan was for my wife and I to do the operation, bringing our canoe from home.

Setting up one end of my antenna. I’m breaking of a stick which I used as a stake to anchor it in the sand.

The initial weather reports didn’t look promising, so we decided not to take the canoe, and instead just operate from the mainland. But while driving there, the weather looked fine, so we decided to rent a canoe and activate the island as originally planned.

The island has been part of the park since 1958. When I was a kid, there was a pedestrian bridge linking it to the mainland, with a trail covering part of the island. Exploring the island was always a fun part of a trip to the park. The bridge is long gone, and the only way to access it is by boat. I did check first, and it’s perfectly legal to land there, although it is posted “No Camping.” And not having been there for about 50 years, it was fun to explore the island again, but there was no trace of the old trails.

There were a few human footprints on the beach, but not many. At the beach where we landed, there were deer footprints, as well as either a dog or a wolf. The only other sign of humans was a fairly recent mylar balloon reading “happy birthday” which had landed in the brush just off the beach. I inspected it carefully to see if it carried a note. Unfortunately it didn’t, so I just picked it up and took it to a trash can on the mainland.

I was on the air from about 3:30 – 5:00 PM, and the weather held up fine. It started looking like rain and we headed back. We had a few drops of rain, but it didn’t start pouring until we had just left the park on the way home.

We found a beach on the east side of the island, and set up there. I used the QCX Mini, running 5 watts on 40 meter CW, and worked about 20 contacts. The antenna was an inverted vee supported my trusty golf ball retriever shoved into the sand and leaning against a tree. The power source was a fish finder battery. I did purchase it new for Field Day, since the previous one was showing signs of wear after 7 years of abuse.

I forgot to bring a folding chair (although my wife remembered hers and was able to relax while I operated). The fallen tree shown above served as a suitable substitute.

Heading home. KC0OIA at the bow, W0IS at the stern.

Best DX was Alabama, I believe. In addition to working Field Day, I submitted the logs for Parks On The Air (POTA), WWFF-KFF, and U.S. Islands Awards Program. This is the first time the island has been activated, and since we went over the magic number of 15 QSOs, it will count as being “qualified” for that program.

Thanks to the stations shown below, some at home, and some out in the field, for pulling in my 5 watt signal. If you look carefully, you’ll see three dupes. All of my logging is pencil and notebook, so sometimes it’s hard to remember who I just worked.

Will I ever save the world with my communications abilities? Probably not. But it’s good to know that with equipment I can carry with me, just a few minutes setting up, and a battery found in any car, I could get messages out to my friends and relatives in case of disaster, and could do the same thing for my neighbors.

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