Category Archives: Radio history

1939 Portable Crystal Set

1939JunPM1939JunPM2This woman, like most radio listeners 85 years ago, knew that a good crystal set would pull in local stations with ample volume and excellent tone, as long as an antenna and ground were available. She took advantage of this knowledge and constructed the low-cost (under a dollar) pocket size crystal set with built-in headphone. The antenna and ground leads had clips on the end, so it was an easy matter to clip it to a telephone, as she did here, or even to a metal drain pipe or water pipe.

As long as the building was not of metal construction, this was said to pull in stations from 2-12 miles away. At home with a long outside antenna, receptions of powerful stations 30 miles away was possible.

The design is from the June 1939 issue of Popular Mechanics.



1920s-Era Regen from 1974

1974ElemElec1Fifty years ago this month, the May 1974 issue of Elementary Electronics showed how to build this receiver, which dated back another fifty years. It was dubbed an “antennaless” one-tube regen, and was said to work well without an outdoor antenna, instead using only a ground connection to a water pipe.

It uses two spiderweb coils, a type 30 tube (although others are possible), a variable capacitor, and only one resistor and capacitor.

I wasn’t able to find the original design, but according to the 1974 article, it was taken from an issue of Radio News from the “early 1920s.”

1974ElemElec2



WKY Mobile Unit, 1949

1949MayRadioNewsGracing the cover of Radio News 75 years ago this month, May 1949, is the mobile unit of WKY, Oklahoma City. The unit was custom built, and was complete with both transmitting and receiving antennas for AM and FM.



1939 Sears BC-SW Radio-Phono

1939May28SearsIf you were in the market for a new radio-phono 85 years ago, Sears was the place to go.  They would give you a liberal allowance for your trade-in.  For only $49.95 plus your old radio (or just $5 down), you could go home with this two-band receiver.  The broadcast band went up to 1720 kHz, so you would be able to pull in police calls.  And the 6-18 MHz shortwave band meant that you could listen to the news direct from Europe.

The ad appeared in the May 28, 1939, issue of the Washington Evening Star.



Grandma Goes to War, 1944

1944MayRadioCraftWhile her sons, son-in-law, and granddaughter were off to war, Mrs. Louise Oeser does her part by calibrating radio transmitters for GE at Schenectady, NY.

This item appeared in the May 1944 issue of Radio Craft.



Battery Charging by Phone, 1924

Screenshot 2024-05-06 1.07.37 PMA hundred years ago, if your radio battery was dead, you could get it charged by phone, kind of. You could call before 10:00 AM, the service station would come and pick it up, and you would have it back in time to pull in the DX that evening.

The ad appeared in the Washington Evening Star, May 25, 1924, and the service was offered by Smith’s, 2119 18th St. NW, Washington, DC.



Gonset Communicator: 1954

1954MayRadioNews

No family picnic is complete without getting on the air and making some 2 meter QSOs, as shown 70 years ago this month on the cover of Radio News, May 1944. While mom gets lunch ready and junior looks on, dad is making some contacts with his Gonset Communicator, which can operate on either 117 volts AC or 6 volts DC.

The magazine contained an article describing the then-new offering. It noted that it was considerably more sophisticated than prewar rigs. While the target market for the rig was hams, the magazine noted that it was also suitable for CAP use, or even as the UNICOM frequency of a small airport.



1954 Civil Defense Radio Truck

Screenshot 2024-05-02 8.34.56 AMScreenshot 2024-05-02 8.36.16 AMShown above is the 1939 Studebaker employed in 1954 by the City of Malden, Mass., as its mobile emergency communications center. Shown at left are Sgt. Orin Hood, W1LD, of the Malden Police Department, along with Eli Nannis, W1HKG, the city’s radio officer and emergency coordinator.

The photos and description appeared 70 years ago this month in the May 1954 issue of Radio Electronics, which explained how such a station could be set up on a reasonable budget. The Studebaker patrol wagon was about to be surplussed by the police department. It had been rarely used, and was in good condition.

The City was also going to get rid of a 1800-watt gasoline generator, and it was obtained and placed on a two-wheel trailer.

For radio equipment, it was equipped with a Harvey Wells model TBS-50C transmitter and National NC-183 receiver. As a backup station, the truck was equipped with a 10-watt 10 meter transmitter, and a car radio and converter. That station could run off the truck batteries. The truck also contained a radio for police frequencies, as well as telephones and wire for hooking them up as needed.

The station had already been put into service when tornadoes struck nearby Worcester.



1944 One Tube Receiver

1944MayRadioCraftEighty years ago this month, the May 1944 issue of Radio Craft carried this circuit for a one-tube receiver. It had been sent in to the magazine by one Bob Smith of Montclair, NJ, who pointed out that standard plug-in coils could cover the shortwave and broadcast bands. He added one word of caution, “do not ground set.” This, of course, is because it was running straight off the AC line, and if you grounded it, there would be a 50/50 chance that you would short out the power. We, of course, will add another word of caution, namely, not to touch anything. The headphones are hot, strapped right to your head. So if you touch a grounded object nearby, there’s a 50/50 chance that the resulting current would run right through you.

A 70-watt lightbulb is used to drop the filament voltage to 12.5 volts to light the filament of the 12A7 tetrode/diode tube.



Crystal Sets for the Poor and Needy, 1924

1924May16WashA hundred years ago today, the May 16, 1924 issue of the Washington Star carried this item. Many listeners had graduated to tube sets, and radio executive Le Roy Mark wanted to see to it that their old crystal sets made it into the hands of the poor and needy of Washington. He had begun an ongoing campaign to collect old crystal sets at Piggly Wiggly and Peoples Drug stores in the District, from whence they would make it into the hands of the needy. 400 names had already been collected, but Mark requested that clergymen and physicians send him the names of others who might benefit.

The Boy Scouts of the District had volunteered to install the sets. The only expense would be the cost of antenna wire, and contributions were being solicited for that purpose.

According to his 1938 obituary, Mark was a pioneer of radio broadcasting in Washington, as well as the insurance industry. The obituary still remembered him as “a leader in the campaign to provide funds to furnish radio sets to all shut-ins, particularly to make available a sufficient number of sets to enable all hospitalized World War veterans to listen to radio programs.”