Category Archives: Radio history

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



1965 Soviet Spīdola-VEF Transistor Shortwave Portable

1966AugPracticalElec

This ad appeared fifty years ago this month, August 1966, in the British magazine Practical Electronics.

Details are lacking in the ad (such as the exact frequency coverage), but this import from the Soviet Union is probably one of the first shortwave transistor portables. The ad proclaims “another gold for Russia,” and that “the impossible has been done” with an 8 band radio for “hardly more than the cost of an ordinary single wave cheap transistor!”

The frequency coverage isn’t stated, but the set appears to be the VEF Spīdola from one of two Latvian manufacturers, Valsts Elektrotehniskā Fabrika (hence the VEF name) and Radiotehnika, both of Riga, Latvia. The sets were produced primarily for the Soviet Union and Eastern Bloc, but some were exported to Western Europe.

From the drawing in the ad, the set appears to be the Spīdola-VEF model PMK-65, which is described in detail at this Russian language Latvian site.

The set’s name means “shining” and is the name of a beautiful witch in a Latvian myth. The 10 transistor superhet runs off 6 D cell batteries, and covers 150-410 kHz longwave, 520-1600 kHz mediumwave, and several shortwave bands. The model described in the British ad is described as having eight bands, but the original Latvian model, with Cyrilic markings on the dial (but with the “VEF Spīdola” name in Roman text), has five shortwave bands. The dial is calibrated in meters, but the tuning ranges are 4.0-5.8 MHz, 5.85-6.3 MHz, 7-7.4 MHz, 9.4-9.9 MHz, and 11.6-12 MHz.

1965 Spīdola-10 export version, known as the Transistor-10 or Convair-10. Wikipedia photo.

Wikipedia shows an export version of the set, shown here, which is said to be the 1965 export version of the Spīdola-10, known as the Transistor-10 or Convair-10. The set has 6 shortwave bands. It doesn’t cover the lowest shortwave band, and the 41 and 49 meter bands are contained in a single band. In addition to 31 and 25 meters, it also covers the 19, 16, and 13 meter bands. The limited dial markings also use the Roman alphabet, and the abbreviations correspond with English.

The frequency coverage of this set matches up best with the description in the British ad, not only in the number of bands, but in the fact that there are “different transmissions at your fingertips 24 hours a day, even including amateur ‘Hams,’ ‘Pirate’ radio stations, ships, etc.” Since the version shown on the Latvian site only goes up to 25 meters, it’s not really optimized for daytime reception. Also, with the tuning ranges focused on broadcast bands, only the 40 meter amateur band is covered. So I tend to think that the British ad is for the Wikipedia export version, although the drawing in the ad corresponds to the seven-band set for the Soviet market.

SpidolaAn excellent history of the manufacturer of this set can be found at LatvianHistory.com.  The site also contains an excellent history of radio monitoring in Latvia as well as Soviet jamming.  It’s surprising to see mass production of consumer shortwave receivers taking place simultaneously with jamming of the signals destined for those receivers, but that appears to be exactly what the Soviets were doing.  The set shown here on that site (image courtesy of Maris Goldmanis) seems to match up closely with the set being advertised in Britain, although the set shown here has only seven bands and has Cyrillic markings.

From what I’ve been able to read, the Spīdola appears to live up to the advertising hype, and was an excellent portable transistor shortwave receiver, and certainly one of the first.

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



Betty Lou Gerson, 1936

BettyLouGerson1936

Shown here on the cover of the August 29, 1936 issue of Radio Guide is radio actress Betty Lou Gerson.

Then 22 years old, she had originally taught “creative dramatics” and never given much thought to going on the air until she was asked to fill in on a broadcast for a friend who was ill. She quickly decided she liked the microphone and asked for an audition. Almost immediately, she was offered a position and her popularity skyrocketed. In 1936, she had roles in “A Tale of Today” and “The Foxes of Flatbush.”

She was born in Chattanooga, Tennessee, in 1914, and grew up in Florida and Alabama before “coming North” in 1931, a fact which the magazine said “accounted for the wonderful southern drawl you hear when she is not on the air.” Her interests included symphony, opera, cooking, sewing, hiking, and boating.

Most of her career was spent in Radio, and she moved to Los Angeles in the 1940’s, when she appeared in series such as The Whistler and I Love Adventure. In 1950’s, she had a voice role as narrator in Walt Disney’s version of Cinderella, and in 1961 landed what was probably her most famous role, namely the voice of Cruella De Vil in Disney’s One Hundred and One Dalmations.

She had some film roles, including Nurse Andersone along side Vincent Price in The Fly.

She also had some television roles in series such as Perry Mason and The Twilight Zone.  She died in 1999 at the age of 84.

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



Farnsworth Model AT-50, 1941

1941Aug28MilJour

Seventy five years ago today, the August 28, 1941, Milwaukee Journal carried this ad from  Gimbels Department Store for this Farnsworth 7-tube set for $28.88.

The set appears to be Farnsworth Model AT-50.  In addition to covering the broadcast band, it had one shortwave band from 6-17 MHz to pull in war news from Europe.  Despite what the ad says, the tuning range is not continuous, and didn’t cover the lower shortwave band or police band.  It was a superhet with one RF stage, and had a tube lineup of 6SK7, 6A8GT, 6SK7, 6SQ7, 6H6, 25L6GT, and 25Z6GT.  It featured pushbutton tuning with six broadcast band presets.

A surviving example of the set can be found at the Radio Attic Archives.

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



Tuckerton Radio Tower

Photo courtesy of Donald O. Caselli, Tuckerton Historical Society.

Photo courtesy of Donald O. Caselli, Tuckerton Historical Society.

We previously published a photo from 1914 of what was then the world’s largest radio tower at Tuckerton, New Jersey.  The tower was part of the German Goldschmidt System, and was in contact with the German station near Hanover, with the call signs WCI and WGG.  During World War I, the station was taken over by the Navy, and the employees were interned as prisoners of war.  The station was later sold to RCA, which operated it as WSC until the 1950’s.

I received an interesting e-mail from from Donald O. Caselli, the President of the Tuckerton Historical Society.

Among other details, he noted that the tower originally stood 850, and included a top wooden section that later fell off. He also included the newspaper article reproduced below, as well as the photo above of one of the footings.

You can click on the images below to see full-size images of the article.

1992-07-22-SmrTms Tuckerton Wireless Radio Tower 01

1992-07-22-SmrTms Tuckerton Wireless Radio Tower 02

1992-07-22-SmrTms Tuckerton Wireless Radio Tower 03

1992-07-22-SmrTms Tuckerton Wireless Radio Tower 04

Acknowledgment

I would like to thank  Donald O. Caselli, President of the Tuckerton Historical Society, for sharing these images.

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



Al’s Radio Service, Owatonna, MN, 1941

1941AugRadioCraft

This ad for Al’s Radio Service of Owatonna, Minnesota, was reproduced in the Mailbag column of the August, 1941, issue of Radio Craft magazine,

along with a letter from the shop’s proprietor, Alfred J. Beauchamp. He reported being a regular reader of the magazine for eight years, during which time he saw many different service shops pictured. However, he reported that he hadn’t seen one that was as modern, up-to-date and complete as his. He asked the magazine to run his ad as a challenge to other servicemen readers. The editor obliged, but also noted that one motivation might have been “as a free ad?–Hi!”

The ad noted that Beauchamp had recently added to his staff a radio engineer and technician of outstanding ability and training. That individual was presumably Myron C. Jones, whose name appears next to Beauchamp’s in the ad. The ad noted that Al’s repaired all makes of radios, and was an authorized service station for Philco, Motorola, and General Motors car radios. While the shop did not sell radios, it was the only shop in the territory completely equipped to satisfy sound equipment needs, and had public address systems for sale or rent, as well as Dorafone office call systems and other inter-office communication systems.

The shop was located at 128 W. Pearl, Owatonna, Minnesota.

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