Category Archives: Radio history

Aleutian Islands Earthquake and Tsunami: 1946

 

Hilo residents fleeing tsunami. Wikipedia photo.

Hilo residents fleeing tsunami. Wikipedia photo.

Today marks the 75th anniversary of the April 1, 1946, Aleutian Islands earthquake and tsunami.  The quake had a magnitude of 8.6 and resulted in hundreds of casualties, including all five lighthouse keepers at the Scotch Cap Lighthouse on Unimak Island. 55 foot waves raced across the Pacific at 500 miles per hour and hit Hawaii 4.9 hours later. In Hilo, 173 were killed, including some who were swept out to sea by the receding waters. The destruction prompted the creation of the Seismic Sea Wave Warning System, the forerunner of the Pacific Tsunami Warning Center.

As detailed in the August 1946 issue of QST, at Ikatan, Alaska, the quake was felt by amateur radio operator Henry W. Peterson, K7FFG, who reported four earthquakes followed by a tidal wave cresting at 60 feet. His home was washed into the bay and many other buildings were damaged. He reported families having to head for the hills until daybreak when they could see what was going on.

At 6:00 AM, he put out a call of QRR, but was unable to make contact until 10:00 AM, when he got in touch with government station KNLL. He also raised Signal Corps station WXFP, which requested that he keep a constant radio watch and report every 15 minutes for 24 hours. He then reported all shocks twice a day. There were a total of about 70 shocks up through April 7.

Local residents were very relieved to know that he was in contact with the Signal Corps and could get help at any time if needed.



1961 British “Ranger 3” 3-Transistor Regen

1961MarRadioConstructor2Shown here from the March 1961 issue of the British magazine Radio Constructor is a set dubbed the “Ranger 3,” a pocket sized three-transistor receiver for the medium waves, including the 160 meter ham band and marine frequencies. The set employed a regenerative detector and had a built-in ferrite antenna. The basic set used an earphone, but as shown in the schematic, it could drive a speaker with a few additional parts.

As was often the case with this magazine, there was a construction article, and the ad for a parts supplier conveniently appeared in the same issue with all of the parts. In this case, Henry’s Radio Ltd. of London could supply all the required parts for just over 79 shillings.

The ad points out that the set should be able to pull in Radio Luxembourg in most areas, and the ad turns this into “Luxembourg Guaranteed (where normally receivable).” The BBC had a monopoly on broadcasting in Britain, and the English commercial program from Luxembourg was a popular alternative.

This simple set did a good job of pulling in the distant station because it was optimized for the station’s wavelength of 208 meters (1439 kHz). Since this was close to the top of the dial on most sets, the reception might be marginal, since they were probably optimized for the middle of the broadcast band. The Ranger 3, however, covered 600 kHz to 2.5 MHz, meaning that the Luxembourg station was right in the middle of the dial. In fact, the article suggested waiting until late at night to tweak the receiver, using Radio Luxembourg as the test signal.

According to the article, the set was a very good performer, pulling in numerous continental stations, especially at night.

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1961 Two Transistor “Little Cub” Broadcast Set

1961SprRadioTVExpThe young man shown here has been drawing Social Security for a few years now, but in 1960, he was pulling in a broadcast station thanks to the two transistor receiver described in the Spring 1961 issue of Radio TV Experimenter.

The set was dubbed by the magazine as the “Little Cub,” and was described as an ideal project for boys, individually or in groups. The circuitry was mounted on the front panel, which was a printed circuit board. Half the fun of building the set was etching the circuit board using etchant liquid. According to the magazine, contact with clothing would cause it to be soiled with a brownish color, “but this solution is not dangerous in any form.”

The circuit board traces actually went on the front of the board, and additional decorations and dial markings were added, meaning that the lettering was all in copper.

After the circuit board was etched and rinsed, the glass baking pan in which it did its work was washed with soap and water and put away, and Mom was presumably none the wiser. Then, the two transistors and one diode and other components were soldered in place. The first stage, a 2N414A transistor, served as RF amplifier and used feedback to boost the signal. A 2N107 transistor was used as audio amplifier. The set also featured a phono input which could be hooked to a record player.

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1971 Italian One Tube Reflex Radio

1971MarRadiopraticaFifty years ago, this Italian gentleman is expressing his approval at the loudspeaker volume coming from this one-tube medium wave set, described in the March 1961 issue of Radiopratica magazine.

The set used a single dual tube, an ECL86, known in America as a 6GW8. The tube was reflexed to get double duty out of the tube, allowing the use of a speaker with a relatively simple circuit. The set ran off line current, thanks to solid state rectifiers, and the detector is also a solid state diode.

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1951: Building the Family Foxhole

1951MarPS1951MarPS4Seventy years ago this month, the cover of the March 1951 issue of Popular Science featured this artwork by artist Denver Gillen (who made the first drawings of Rudolph the Red Nosed Reindeer, and later, numerous covers for Outdoor Life) showing “what an A-Bomb blast may do to your home,” but with an inset of a family safely hunkered down in their family foxhole.

The cover entreats the buyer to save the issue, since it contains a special section on emergency preparedness written by Michael Amrine, formerly of the Atomic Energy Commission.

The magazine’s editors noted that much of the literature regarding civil defense was “tragic nonsense–aspirin for cancer. Even the official booklets say mainly, ‘Keep calm, keep covered, and follow directions.” But it goes on to say that official directions might not be forthcoming, since there did not exist civil defense organizations comparable with the problem. Instead, the magazine advocated “planning and plain hard work” by individual homeowners, and the magazine contained advice on how to do that. “The hard truth is that the most you can expect from civil defense will be control and rescue work after a bombing. The most effective preparation for atomic attack will be family by family, house by house.”

1951MarPS2The article first noted what not to do, and pointed out that steps such as blacking out the house, taping windows, or even buying a Geiger counter were of very minimal utility. It noted that, as in Hiroshima and Nagasaki, radiation was not going to be the big killer. Instead, it would be the familiar forces of heat and blast, and the article gave pointers on preparing a refuge room to protect against them. The author asked readers to “imagine that your house is in a cyclone or hurricane belt, and next door to a gas tank” and plan accordingly. The most important principles in planning a refuge room were making sure there were at least two exits, keeping out from under heavy furniture or appliances, and preferably being in a corner of the cellar with the least windows or exposure. The importance of using a corner is illustrated by the drawing at left.

After a spot was located, ideas such as shuttering windows and making use of a heavy table or workbench were outlined.

The article included a number of frequently asked questions, including “what should I tell the children?” The answer was simple: the truth. They should be instructed where to go in a raid and how to hit the deck. You shouldn’t scare them, but don’t make it a game, either.

1951MarPS3For homes without a basement, the author suggested placing earth or logs against an outside wall, with a sturdy table inside.

The list of recommended supplies included the usual suspects such as canned food and battery operated lights. Under the category of “valuables,” the recommendation included an extra pair of glasses and a lockbox for valuable papers. Rounding out that category was money (in small bills), on the assumption that, as in the last war, the economy would be in full operation.

The list included a wind-up clock and maps of the city and county. The battery operated radio made its usual appearance on the list. The article noted that utilities would probably be out, although some, especially the gas lines, might continue to function for a time. Since battery operated radios were still quite rare (but not unheard of) in 1951, the article noted that a car radio would also work.

The article did note that it was dealing with just the Hiroshima-style A-bomb, and not the H-bomb. It notes that the H-bomb was then still just a theoretical possibility, but that if perfected, it would wreak the same level of damage over a still larger area.

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1941 “Little Giant” 5 Tube Superhet

1941MarPM1AFor many years, the March issue of Popular Mechanics featured a radio receiver dubbed the “Little Giant,” and the couples here are enjoying the last months of the prewar era by dancing to the sounds of the magazine’s 1941 rendition.

The set is a familiar “All American Five” AC-DC superheterodyne circuit, featuring a tube lineup of 12A8GT, 12K7GT, 12Q7GT, 50L6GT and 35Z4 rectifier.

The magazine noted that the set was easy to build, had unusually good tone, with full volume and distance-getting ability. The cabinet could be homemade, or purchased from a parts house.

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Using Bad Tubes as Rectifiers

1946MarPS375 years ago this month, the March 1946 issue of Popular Science showed what you could do with bad tubes. If a tube tested bad for its particular circuit, it was a shame to just throw it away, and you didn’t have to. As pointed out here, unless a tube was completely burnt out, it would probably serve just fine as a rectifier. As shown here, the plate and grids were wired together to form the anode, and the tube could continue for many years serving as a rectifier.



1946 Automatic Hot Dog Machine

1946MarRadioCraftThese gentlemen 75 years ago were purchasing their power lunch from a coin-operated vending machine capable of dispensing hot dogs, hamburgers, or grilled cheese sandwiches. The picture appeared in the March 1946 issue of Radio Craft, which points out that the machine was only slightly larger than the usual soft drink or cigarette machine, and operated from a standard 117 volt outlet.

The food was heated by radio waves, from “two specially developed high-frequency power oscillator tubes.” In other words, the machine was an early version of the microwave oven. THe engineers toiled long and hard to develop the machine. In particular, the choice of frequency was problematic. Some frequencies would heat the roll but not the frankfurter. Other frequencies would heat the frankfurter but burn the bun. Finally, however, a frequency that was just right was found, and the machine was put into production.

While we recognize this dialectric high frequency heating to be the principle employed by the modern microwave oven, the magazine cautioned that home ovens were not just right around the corner:

It should not be construed from this development that the electronic stove is just around the corner, electronic engineers hasten to explain. The canteen grill and the electronic stove present two different kinds of problems and the accomplishments in the development of the former should not be interpreted as solving the problems yet to be overcome in the field of electronic cooking.

The two in the picture are identified by the magazine as Messrs. Baker and Leverone, first names not given. They are associated with General Electric and Automatic Canteen, the companies responsible for the new machine.  Leverone is probably Nathaniel Leverone, the founder of the vending machine company.



1941 Young Soviet Radio Hobbyists

1941MarRadiofrontWhen this photo was taken for the March 1941 issue of Радиофронт magazine (Radio Front), the Molotov–Ribbentrop Pact of 1939 was still in effect, and it wasn’t until June 1941 that Hitler decided to invade the Soviet Union.

But if you look carefully at these young comrades, you can see that they know something is wrong. They handed the headphones to their most skilled operator, the young woman at the left, and she is probably pulling in a faint message indicating that the Germans are up to something. Chances are, she tried to warn Stalin, who wouldn’t listen to her. But these comrades knew that they would soon be called upon to defend Mother Russia from the invading horde.

And unfortunately, it’s unlikely that all of these young people lived to see the end of 1945.



GE Model L-678 Radio Phono: 1941

Life19410310These girls are now close to 90 years old, but they undoubtedly had an appreciation for music their entire lives, thanks to their parents’ foresight in buying this model L-678 radio-phono from General Electric. They are shown here having a concert in their very own room thanks to the instrument. They were able to operate the set themselves, and the turntable could accommodate 12 inch records, even with the lid closed.

Their parents were able to find much of the world’s finest music especially arranged for children, allowing them a wonderful opportunity to develop an appreciation for good music. This set retailed for only $39.95. The ad also featured the model L-500 radio, “encased in handsome mahogany plastic cabinet that won the top award in the nation-wide Modern Plastics contest.” Also shown is the portable model JB-410, which the police officer notices and points out that he also has a GE radio in his squad car.

The ad appeared 80 years ago today in the March 10, 1941, issue of Life magazine.