Category Archives: Radio history

1976 Car FM/8-Track

1976fm8track

Forty years ago, the September-October 1976 issue of Elementary Electronics reviewed a product that, at first blush, seems to be an unusual combination.  Shown here is the Pioneer model TP-900, a combination 8-track player FM stereo receiver.

The magazine posted a very good review.  The FM receiver was very good quality, and the tape player contained a number of features such as fast forward and automatic repeat that made it quite convenient for that medium.

The combination is actually quite logical.  Virtually every car of the era came equipped with an AM radio.  FM was just beginning to outpace AM in popularity, and there were undoubtedly a lot of audiophile motorists who wanted to add both and FM radio and tape player to their vehicle.  Since the car was already equipped with a perfectly good AM radio, simply adding one unit with the two capabilities seemed like a logical choice.

rsfm8track

In fact, I was the owner of the Realistic FM radio/8-track player shown here, from the 1979 Radio Shack catalog.  It was an inexpensive way to augment the car’s audio with little installation.  I simply put this under the dash, with two small home speakers in the back.  The car AM radio continued to work as usual, but I also had the option of FM or 8-track tapes.

 

Click Here For Today’s Ripley’s Believe It Or Not Cartoon



Two 1946 Crystal Sets from Popular Mechanics

1946SeptPM

1946SeptPMpictorialThe happy couple shown here are pulling in signals up to 25 miles away with one of two crystal sets described 70 years ago this month in the September, 1946, issue of Popular Mechanics.

The set they’re listening to is described as having eye appeal as modern as tomorrow. To achieve this effect, the base, coil form, and base for the detector are all made of plexiglass, dressed up with red plastic drawer pulls for feet.

The set featured two antenna taps. One, going directly to the main tuning coil, was used to tune in the strongest station. When more sensitivity was required, the antenna could be attached to a primary coil.

1946SeptPM2The other set, while appearing more rustic, actually contains a couple of more modern twists.  First of all, it replaces the cat’s whisker with a 1N34 germanium diode.  It also featured a dial cord.  No variable condenser was used.  Instead, tuning was accomplished with a permeability tuned coil, which was adjusted by moving the iron core through the coil with the dial cord.

Click Here For Today’s Ripley’s Believe It Or Not Cartoon



W2OEC, Ft. Monmouth, NJ, 1946

1946septradiocraft

Seventy years ago, the cover of the September 1946 issue of Radio Craft shows the well equipped station at W2OEC, the military recreation club station at Fort Monmouth, New Jersey. Since the base was the home of the Signal Corps, it understandably had a large population of hams. Indeed, since there were hams from throughout the country, there was talk of adding an award for working all ten call areas within Momnouth County, New Jersey.

There were plans to equip the station with a kilowatt on all bands below 30 MHz. Transmitters consisted of military models BC-610 and BC-339.

The accompanying article described the station’s antennas, which included a rotatable beam for 10 meters. The 80 meter antenna’s main lobe was aimed for Missouri, allowing good coverage of the entire country.

Click Here For Today’s Ripley’s Believe It Or Not Cartoon



1931 Television Image

1931SeptTVFor an idea of what kind of picture quality was available with early mechanical television, here is an example from 85 years ago, from the September-October 1931 issue of Television News.

The photo was sent to the magazine by H.E. Burket of 819 Center Street, Chicago, Illinois, who reported that he captured the image from the broadcasts made by the Chicago Daily News station.

Burket’s receiver consisted of an 18″ scanning disc, driven by a synchronous motor with gear transmission. He had been experimenting with various glow tubes. While neon tubes were most commonly employed, Burket noted that spot and crater type glow tubes with white or green light gave superior images.

He reported that the photographs were made with exposure times of between 2-1/2 and 10 seconds. He also noted that while lines were visible on this image, he had recently switched to a different scanning disc with which the lines were no longer visible.
Click Here For Today’s Ripley’s Believe It Or Not Cartoon



Siege of Leningrad: 1941-43

Today marks the 75th anniversary of the start of the Siege of Leningrad. On September 8, 1941, German and Finnish troops cut off the last land access to Leningrad, in a move deliberately designed to starve the residents. The city was cut off almost completely until January 18, 1943. For most of that time, the only lifeline was a route over Lake Ladoga known as both the “Road of Life” and the “Road of Death.”

RIAN archive 324 In besieged Leningrad.jpg

Nevetsky Prospekt, Leningrad, 1942. Wikipedia photo.

During the siege, approximately 1.5 million Soviets died, mostly of starvation. Most residents subsisted on 125 grams (about a quarter pound) of bread per day, and the bread consisted of half sawdust.

One propaganda coup scored by the Soviets was the premiere of Symphony No. 7 by Dmitri Shostakovich. It was composed by Shostakovich partially while in the sieged city, and partly after being evacuated. But it had its premiere on the Leningrad radio on August 9, 1942. The date was highly symbolic, since it had been scheduled by Hitler as the date for a celebration within the city of the completion of the invasion. Supposedly, Hitler even had invitations printed up for the event to be held at the Leningrad Astoria Hotel.

The first rehearsal lasted but 15 minutes, since the musicians (especially the brass players) were physical unable to perform due to malnutrition. But with heroic efforts, the concert took place as scheduled, and was broadcast.

For full propaganda effect, loudspeakers outside the city were directed toward the German lines, and the German soldiers were treated to the concert. One German soldier later recalled, “who are we bombing? We will never be able to take Leningrad because the people here are selfless.”

Civilians constructing anti-tank fortifications. Library of Congress photo.

While the concert was broadcast over “radio,” the actual broadcast almost certainly took place not over the airwaves, but through the extensive Soviet wired broadcasting network. The vast majority of “radio” receivers in the Soviet Union were not actual radio sets, but a speaker, transformer, switch, and volume control, which may or may not have been mounted in a radio cabinet. The receiver was commonly called a “rekord.” These simple receivers were connected to a wired network, similar to a telephone network, which would carry the program continuously.  Indeed, according to this source, private radio receivers were confiscated at the very beginning of hostilities with Germany.

Immediately prior to the war, the Soviet Union boasted over 5.5 million wired speakers. In contrast, as of 1936, the country had only 650,000 radio receivers, 270,000 of which were crystal sets.  A nice collection of such speakers (mostly postwar) can be found at this link.

The use of wired radio during the siege of Leningrad is stated here:

The wire net of the radio diffusion exchange may carry programs which originate at the exchange, and this makes possible utilization of the radio for mass communication of a purely local nature. This ability to broadcast without actually going “on the air” proved itself invaluable during the war, since the local radio could continue to function and maintain contact between the authorities and the population without the risk of having enemy aviators make use of the signals to guide them to their objective.

An outstanding example of such use of the wired net is to be found in the siege of Leningrad. During the siege the Leningrad wired net operated around the clock. During hours when no programs were on and throughout the night the Leningraders kept their speakers tuned in.  The slow beat of a metronome kept the wire alive. Whenever it was necessary to make an important announcement the beat of the met – ronome was rapidly increased. Thus, at all times the authorities were able to maintain constant contact with the population, to transmit orders, warn of danger, or make special announcements .

Communications Research 1948-1949, page 245.

The Seventh Symphony was first broadcast in the United States on July 9, 1942, over the NBC network. As explained in an article in the April 1945 issue of Radio Age, the musical score was sent from Moscow to the United States via facsimile, or what the article called radiophoto.

https://www.youtube.com/watch?v=jd8iAe4WhMM

At Amazon

Click Here For Today’s Ripley’s Believe It Or Not Cartoon



Dyna-Scan Flying Spot Video Generator, 1956

1956SeptRadioElectronics

This ad for an interesting piece of test equipment appeared 60 years ago in the September, 1956, issue of Radio Electronics magazine.

It shows an early pattern generator for the TV serviceman, the Model 1000 Dyna-Scan video generator from B&K Manufacturing Co., 3726 N. Southport Avenue, Chicago. The device was quite ingenious, and had a number of applications besides service.

The principle of operation was quite simple. The image which was to be converted to video was printed on a transparency. This could contain the test pattern or bar or dot patterns that were included with the unit. The transparency was placed in front of a CRT which served as a “flying spot” generator, in much the same way as a “flying spot” was employed by some early mechanical television systems.

Since the CRT did the scanning, a 931A photomultiplier tube placed on the other side of the transparency would pick up the video signal, synched with the scanning of the CRT. This model apparently used the ultraviolet images emitted by the CRT, so it appears to function even with the tube exposed to other light. Images of one of these in operation can be seen at this link.

The unit could also transmit an audio signal, and had a built-in RF modulator which could be tuned to any VHF channel.

Because the unit was a relatively low-cost method of generating a TV signal, it had other uses besides the serviceman’s shop. It could be used at the head end of a community antenna TV system to send an audio or video signal. Since any message could be put on the transparency, this allowed video announcements to be transmitted. It was also billed for use as a paging system for use in a hospital or similar application. Messages could be written on a transparency, and viewed by a standard television elsewhere in the building.

The device sold for $199.95, but the advertisement also showed a less expensive version. For $69.95, you could buy the Model 950, which included the pickup and RF generator only, but without the CRT. This could be used along with a “properly modified 10-inch TV set which acts as your external flying spot scanner.” This version also came with a set of three transparencies.

Some good pictures showing the device in operation can be found at this link, and some more pictures and a schematic can be found at the Radio Museum.

Click Here For Today’s Ripley’s Believe It Or Not Cartoon



Jean Hudson Magri, W2TEF

w2tef two darker

A few weeks ago, I included some information about Jean Hudson, who received her amateur license in 1933 at the age of eight years old.  She went on to win a championship in copying code, and was featured in advertisements for “the Candler System,” an amateur radio training course.

I wasn’t able find any more information about her after 1945, but I did hear from reader Bob Ballantine, W8SU, who provided more information, as well as the undated photograph shown above and the 1933 and 1935 QSL’s shown below:

w3bak jean hudson young cw

w3bak ham family

w3bak reverse

w3bak 1935 family articleHe also included the following “Strange As It Seems” cartoon from October 11, 1933, showing Jean at the radio, as well as the newspaper clipping (apparently from 1935, as it identified Jean as being 11 years old).  (Click on the image to view the full article).

w3bak strange as it seems 1935

He also provided a vital clue, in the form of her married name, Jean Hudson Magri.  Mrs. Magri passed away in 1997, and is buried in Union Cemetery, Georgetown, Sussex County, Delaware.

After the war, Jean was licensed as W2TEF.  She received a degree in physics from Manhattanville College in New York, and served as the trustee of the college station, W2QPB.

Jean’s sister, Dorothy Hudson Elliot, W3IRR, who was also mentioned in the earlier article, was licensed at the age of 17.  She passed away in 2014 at the age of 100.

Thank you to W8SU for providing the additional information and photo.

Click Here For Today’s Ripley’s Believe It Or Not Cartoon



1936 Talking Briefcase Receiver

1936SepRadioCraft

Eighty years ago, the September 1936 issue of Radio Craft magazine carried the plans for this “talking briefcase” receiver.

The authors of the project article, Hugo Gernsback and J.T. Bernsley, noted that the set’s novelty and usefulness had been well attested to by hundreds of admiring and envious comments made by spectators who saw the set operating on the streets of Brooklyn and Manhattan. They noted that while there had been other portables, nobody had really seen a true pedestrian set until this one came along.

The set was a four tube TRF, with a total weight under 11 pounds, including briefcase, chassis, and batteries. A modern magnetic speaker with alnico magnet provided excellent tone quality. A TRF circuit was chosen due to simplicity of construction, as well as the fact that a serviceman’s signal generator wouldn’t be required to align the set, as would be the case with a superhet. A 3-gang variable condenser tuned all of the stages simultaneously.

The set featured two 1A4 tubes as RF amplifiers, a 32 detector, and type 95D serving as AF amp. No antenna or ground was required. Wire was wrapped around the handle of the briefcase, and when carried, the owner’s body was capacitively coupled and served as the antenna. For use when not walking, a 10-15 foot section of wire could be tossed on the floor to serve as antenna.

1936SepRadioCraftSchematic

Click Here For Today’s Ripley’s Believe It Or Not Cartoon



1946: Grand Feeling to Log a New Ham Station

1946SeptPM2According to this Texaco ad from seventy years ago, using the right lubricant for your car is almost as good as ham radio.

The ad proclaims that it’s a grand feeling to log a new ham station, and it’s also a grand feeling when your car is cushioned with Marfak chassis lubrication from Texoco, which gives a car that “cushiony” feeling for at least a thousand miles.

With ordinary greese, according to the ad, you’re taking the road shocks after a few hundred miles. But Marfak from Texaco stayed on the job hundreds of miles longer for more velvet smooth riding, as depicted by the car supported by balloons.

The ad appeared in the September 1946 issue of Popular Mechanics.

Click Here For Today’s Ripley’s Believe It Or Not Cartoon



1941 Admiral Model 4207-A10

1941AugustRadioRetailing

This ad from 75 years ago, in the August 1941 issue of Radio Retailing is of special interest to me, since I own the receiver shown here.

The set, model 4207-A10 tunes the broadcast band, as well as the 25 and 31 meter broadcast bands. It’s actually a quite good receiver. As the ad points out, the limited tuning range “s-p-r-e-a-d-s stations for easier tuning and logging.” Even though it did not tune the full range of frequencies included in most shortwave consoles, the bandspread really does make tuning easier. The receiver also has one stage of RF amplification, which is tuned with a permeability tuner ganged to the main tuning condenser. So it pulls in stations quite well. The set I have probably tuned in a lot of wartime broadcasts and served its owner well during the war years.

The set also contains an automatic record changer in the “Slide-A-Way” compartment. The changer played ten 12″ records or twelve 10″ records automatically. The automatic changer in mine stopped functioning decades ago, and I have to give the turntable a little spin to get it going, but it still functions. The ad notes that the set comes with a “lifetime” needle, but I had to replace mine. I sacrificed a ceramic cartridge from a more recent phonograph, and it functions well, although it’s currently held in place with a twist tie.

My set apparently retailed for $129.95. The model shown in the picture, however, is not identical to mine. The one shown appears to be a slightly less expensive model which covered only 31 meters in addition to the broadcast band. According to another item in the magazine, the set was also available as an AM-FM receiver, covering the prewar FM band, and also with one police band and one shortwave band.

The ad above, targeted at retailers, showed the advertising campaign that admiral had planned for the fall. It shows an ad that would be appearing in September in Colliers, Esquire, and the Saturday Evening Post. Dealers were promised that they would have their “biggest radio harvest in years!”

 

Click Here For Today’s Ripley’s Believe It Or Not Cartoon