Monthly Archives: May 2022

1937 Battery Set

1937MayPM21937MayPM3Eighty-five years ago, this rural family is able to enjoy the radio at home, in the field, or on a picnic, thanks to this receiver described in the May 1937 issue of Popular Mechanics.

The set ran off a single six-volt storage battery. The low-current filaments ran directly from the battery, and a vibrator power pack supplied the 150 volt B+.

The superheterodyne circuit was said to be an excellent performer. The magazine did caution that on a set of this type, it was important not to skimp on cheap parts. The completed set could be built in to either a tabletop cabinet or a console.

1937MayPM1



Smokes for Soldiers: Just 85 cents

1942May20PghAccording to this ad in the Pittsburgh Press 80 years ago today, May 20, 1942, many of our boys fighting overseas were unable to buy cigarettes at any price.

To solve this intolerable situation, Philip Morris came to the rescue.  For just 85 cents, you could send a carton to any APO or fleet address.  You just paid at your local retailer, they would pass the order on to their jobber, and Philip Morris would see to it that our boys had plenty of smokes.



1947 4-Tube Broadcast/Shortwave Receiver

1947MayPMSeventy-five years ago, this couple are pulling in a program on the shortwaves thanks to the 4-tube set described in the May 1947 issue of Popular Mechanics.

1947MayPM2It was actually the second in a series of “progressive” receivers. The circuit was entirely different from the radio shown in the previous month’s issue, but it used most of the same parts and had the same layout, using a slat-style wooden chassis to make construction (or re-construction) easy.

It covered 550 kHz to 16.6 MHz with three plug-in coils. It was said to be an excellent performer on the shortwave bands, and had enough audio to provide loudspeaker volume. No battery was needed, since it used one of the 6J5 tubes as a rectifier, and contained a filament transformer.

1947MayPM3



Merle Radio Company, Plainfield, NJ, 1952

1952MayRadioElecThe efficient workbench shown here is an auto radio work station of Merle Radio Company, Plainfield, NJ, as shown on the cover of Radio-Electronics, May 1952.

Service was handled in a drive-in shop, part of a 35 x 90 foot overall space for the business. The owner of the shop had recently branched out in the radio industry, having purchased the local FM station, WXNJ, and had an AM application pending.



1962 3M Aztec Kerosene Generator

1962MayRadioElecWe’ve previously reported that in the late 1950s, the Soviets led the free world not only in space, but also in kerosene powered radios. They produced a 7-tube set powered by kerosene, a thermocouple, and vibrator power supply.

But it turns out that the Americans were close on their heels, and were producing a superior product just a few years later, as shown here. This battery, dubbed the Aztec, was produced by Minnesota’s iconic 3M, and could power a transistor radio (apparently sold separately) for up to 24 hours with a pint of kerosene.

You can see a pristine example, apparently for sale, at this link, which also includes a link (currently broken) to one in a Canadian museum.

The American model produced a low voltage, which was stepped up to 6 volts with a transistorized power supply mounted in the base.  In addition to use in off-grid locales during peacetime, the set was billed as having a Civil Defense purpose for powering the important radio in the fallout shelter.



Girlstown, TX, 1962

1962MayPEShown here are Sandra D. Roberts, WN5ASZ, Donna K. Fomby, WN5APM, Linda L. Neal, WN5AOG, Ella R. Sanders, WN5AUJ, Bonnie J. Baggerman, WN5AUI, Nina C. Shaw, WN5AUQ, and Carol J. Fontenot, WN5APG, along with Vivian McCracken, the director of Girlstown, a home for 32 girls who had lost their parents near Whiteface, Texas. When a winter storm cut off their power, heat, light, and telephone, the members of the Terry County radio club decided that the facility needed amateur radio. Members made the trip every Friday evening to teach interested girls code and theory. As a result, the seven girls shown here obtained their novice licenses.

According to the May 1962 issue of Popular Electronics, they were set up on 80 and 40 meters with the Hammarlund HQ-180 receiver and Heathkit DX-60 transmitter shown in the photo, generously donated by the club members. The girls were open to schedules, and I’m guessing more than one novice kept on the lookout for these callsigns after getting the magazine. The magazine noted that classes continued, and at least four girls were at work on their general licenses.

As far as I can tell, only of of the girls in the photo retained her license after leaving Girlstown. As late as 1973, there was a listing for Sandra R. Heinrich, WA5ASZ, in Irving, Texas, seated at the left in the photo.



1947 Tom Thumb Portable

1947MayRadioRetailingIf you were wondering what the most wished-for radio of 1947 was, this was it, at least according to the manufacturer, the Automatic Radio Manufacturing Co., 122 Brookline Avenue, Boston.

The radio in question was the Tom Thumb portable, a four-tube (plus selenium rectifier) portable that came with its own rechargeable battery, undoubtedly a two-volt lead-acid cell. It could operate off battery, AC, or DC, and the battery could be charged internally (but now with the radio playing).

It was rather pricey, at $47, the equivalent of over $600 in 2022 dollars.

The ad appeared in the May 1947 issue of Radio Retailing.



1942 Police Radiotelegraph Network

1942MayRadioNewsThere was a time when cops knew Morse Code, and one of those times was 1942, as described in the May 1942 issue of Radio News.

Shown above is the operator of the Indiana State Police radio station, which included three National HRO receivers and separate speakers.

Spanning 40 states, a network of about 100 such stations allowed rapid dissemination of police data from one part of the country to the other. Stations were classified as either zone or interzone. Zone stations generally operated within the same state, with interzone stations communicating nationally. Nine frequencies were available in the 7000, 5100, and 2800 kHz bands. Operating procedures followed those of the Navy, with Z signals used.

Coast-to-coast messages might be relayed up to six times. For example, the article cited a case in which a suspect was wanted for forgery in Tacoma, Washington, and believed to be en route to his home in Niles, Michigan. In that case, the Tacoma department used its interzone station to send the message to Denver, where it was relayed to Kansas City, and then to Springfield, Illinois, and then to Lansing, Michigan. The message was then sent by radiotelephone to Niles. Out-of-state vehicle registrations could be checked, as could emergency notifications.

With the country at war, the police network was also pressed into use for national defense. the Army Quartermaster Corps, fo example, had the duty of providing meals for troops being transported, and arrangements could be made thanks to the police network.

In case of enemy attack with communications disrupted, the police network with its experienced operators could handle communications to practically any place in the United States.

1942MayRadioNews2



Miss Radio News: 1947

Screen Shot 2022-05-06 at 10.13.57 AMShown here on the cover of the magazine’s May 1947 issue is Miss Radio News of 1947, Carmen Garcia, as selected at that year’s Radio Parts Conference and Show. She is demonstrating the Meissner “18th Century” AM-FM-Phonograph console.

The photograph was taken by Arthur E. Haug, a staff photographer for the magazine.



1922 Automated Hunting System

1922MaySciInvSomething tells me that if you use this idea today, you  might have some splainin’ to do down at the game warden’s office. But a hundred years ago, this self-explanatory idea from the May 1922 issue of Science and Invention was apparently acceptable.

It was sent in to the magazine by one Venencio F. Lim, who explained that the birds sometimes flee when you get too close, so this system allowed him to observe through a telescope, after placing some bait in line with the shotgun shell. A battery, spark coil (probably from a Model T), and telegraph key rounded out the system. When the bird was in position, the key was pressed from a distance, and the bird dispatched.

Despite a variation in the spelling of the first name, it appears likely that the author was Venancio Lim, from the Philippines, a 1927 Electrical Engineering graduate of Purdue University. According to this page written by his great grandson, he went on to become the chief engineer of the national power company. He was imprisoned by the Japanese for a year, weighing only 80 pounds upon his release. He was later appointed to represent the Philippines in the War Reparations Commission, and he ultimately forgave the Japanese for his treatment.