Category Archives: Radio history

Sinclair Slimline Radio, 1963

Sixty years ago this month, the July 1963 issue of the British publication Radio Constructor carried this ad for the Sinclair “Slimline” micro-radio receiver kit. It was reportedly “acclaimed as the most amazing receiver ever,” and the set, measuring 2-3/4 x 1-5/8x 5/8 inches, would pull in both British and European stations with staggeringly good quality.

The parts were sold by Sinclair Radionics Ltd. of Cambridge. If the name, and the general style of the advertisement, look familiar, it’s because the proprietor was the same Sir Clive Sinclair who went on to market the Sinclair ZX80 computer, a version of which was sold on this side of the Atlantic as the Timex Sinclair.



1963 CB Walkie Talkie for Junior

1963JulPEThis young man, Joseph Guy, from somewhere in the midwestern United States, has been collecting Social Security for a few years now, but sixty years ago, his mother gave him this CB handheld radio to stay in touch on his way to school.

This photo was taken on a 22-below-zero day, and immediately after the picture was taken, young Joey was camouflaged with a heavy scarf, hat, and mittens. While his mom stayed at the 5-watt base station at home, he walked to school, and mom reminded him to look both ways before crossing busy intersections. When he reached school, he called to report his safe arrival.

The only downside was his occasionally failing to turn it off when he reached school. But rechargeable batteries partially solved that problem. Other mothers, whose children were following him, would often call to see if their children reached school safely.

The photo and story appeared in the July 1963 issue of Popular Electronics.



NBC “Beer Mug” Remote Transmitter, 1938

1938JulRadioNewsShown here, on the cover of Radio News for July 1938, is Annette King, a radio personality with NBC Chicago. She appeared on programs including Club Matinee.

Of note here, she is speaking into the network’s “Beer Mug,” a portable transmitter designed for use in remotes. The crystal controlled transmitter operated on 30-41 MHz, and its 200 mW output was said to have a range of up to a mile. Batteries would last for up to ten hours, and the transmitter met all of the strict FCC requirements.

It contained an automatic modulation control which was frequently referred to as a “built-in studio engineer.” The original version weighed 13 pounds, but the one shown here was only 7 pounds. It was standard equipment at all NBC offices.



Grounding Your Boat Radio: 1938

1938JulPMThis young man is about 90 years old today, but in the July 1938 issue of Popular Mechanics, he was demonstrating how to get good radio reception aboard your boat. The antenna was, of course, important. But putting a copper sheet below the water line ensured an excellent ground connection.



1953 Audio Amp/Phonograph/Radio

1953JulPMSeventy 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.

1953JulPM2



1923 Radiola II for the Farm

1923Jul18A 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

1943JulRadioRetailing2Eighty 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

1923JulQSTGetting 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

1938JulPSEighty-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.

1938JulPS2



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1923 Distance Learning

1923JulPSDistance 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.