Category Archives: Radio history

Washington, DC, Outside Antennas Need Permit: 1923

Screenshot 2023-11-14 11.26.04 AMIt’s quite possible that the stealth antenna had its genesis a hundred years ago today, as seen from this banner headline in the November 20, 1923, issue of the Washington Times.

According to the newspapers, Washington D.C. radio fans with an outside antenna would need to get a permit from the district engineer office.  That permit would need the approval of the District electrical engineer, would require an in-person inspection, and, not unimportantly, a fee of $2 (the equivalent of $36 in 2023 dollars).  Since this was the first anyone had heard of such a requirement, the newspaper pointed out that a multitude of radio fans were outlaws.

The order had come down from superintendent of police Daniel Sullivan, who informed the force of the requirement.  In no event were the wires to cross any public space.  The law had actually been in effect for many years, but the city electrical engineer had only recently brought it to the attention of the police department.

One motivation for the new law was the death of a park police officer while putting up an antenna, presumably on his own time and on his own property.  The tragedy apparently prompted the police to begin enforcing the requirement.



1963 8-in-1 Project Kit

1963NovPMSixty years ago this month, the November 1963 issue of Popular Mechanics showed how to make this 8-in-1 project kit. The heart of the unit was a 2N107 transistor. It could be used as a code oscillator, or with the pitch of the oscillator turned way down, it would start clicking and serve as a metronome. It could also be used as a continuity tester, or for making various alarms.



RCA Tubes: 1938

1938NovRadioRetailingEighty-five years ago, RCA reminded dealers of the importance of the RCA name when it came to tubes. Since the earliest days of radio, RCA had cranked out 35 million tubes, and the public trusted the name.  They were relied upon in industry, and by radio stations, both foreign and domestic.

If you were a dealer, would you want to take a chance on an off brand?  The ad appeared in the November 1938 issue of Radio Retailing.



Emerson Models AX-211 and BM-216, 1938

1938Nov14LifeEighty-five years ago today, the November 14, 1938, issue of Life magazine carried this ad for  the Emerson model AX-211 radio, as well as the model BM-216 radio-phono.  The radio was a five-tube set, and the radio-phono had four tubes (plus a “ballast”).

As you can see, this was a time when people dressed up to listen to the radio.  But you treat it as a formal occasion, too, if the radio provided a whole philharmonic performance from a radio the size of your hat!  According to the ad, this was possible because the sets included a “miracle tone chamber.”  It was the first time the miracle chamber had been offered in a set selling for less than $29.95.  And indeed, they were considerably below that price point.  The radio sold for $9.95, and the radio-phono went for only $19.95.

You could visit your closest dealer.  Or, if you preferred, you could mail the coupon to Emerson, and their closest dealer would bring you a set on approval, with no additional shipping charge.



I’ve Fallen And I Can’t Get Up: 1973 Antecedent

1973NovElemElecOver a decade before Mrs. Fletcher (played by actress Dorothy McHugh) famously told the world that he had fallen and can’t get up,  London engineer Douglas Wells, presumably shown in the dramatic re-enactment shown here, was at work on the problem. An elderly neighbor had tripped and fallen down the stairs of her home. She was found three days later, dead. This inspired Wells to come up with the early prototype shown here. It consisted of a mat which was placed at the bottom of the stairs. If someone fell down the stairs and landed on the mat, it would trigger an alarm bell and lighted “HELP” sign outside the house.

This would, of course, be a great benefit if someone fell on that particular stairway. But it would be of no help if some casualty afflicted the person elsewhere in the house. So the wireless device worn around the neck, hooked up to the telephone line, is probably a better solution.

For those in need of such a system, the first point of inquiry is often your local hospital, some of which provide these systems free of charge. If that’s not an option, one alternative is a medical alert service. They typically supply the equipment at no cost, but provide the service for about $20 per month. So if the person requiring assistance pushes the button, like Mrs. Fletcher, they will speak directly to an operator who will summon the required assistance. You can find a comparison of the available services at this link.

Another option is to purchase equipment similar to that shown here.
It consists of a base unit that connects to the normal landline telephone. If either of the panic buttons is pushed, it automatically dials up to three telephone numbers and plays a prerecorded message. The advantage of this type of system is that the caller ID information is displayed at the other end. So if it’s set to call 911, then the 911 dispatcher will know the location of the emergency. However, it’s probably best to program it to dial the numbers of friends or relatives who can intervene in emergencies, which may or may not warrant 911.

The third option is a system similar to the one shown here.
This small unit is actually a cellular phone. It relies upon the fact that all cellular phones in the U.S., whether or not activated, are required to be able to call 911. In this case, 911 is the only number it will call. The disadvantage is that, since it is not an activated phone, the 911 dispatcher probably won’t have access to your location. But as long as the owner is able to speak, they will be able to tell the dispatcher where they are, and what the emergency is. The phone is turned off until the button is pushed, so batteries (normal AAA batteries) will last a long time, and only need to be replaced once a year or so.

A final option for anyone potentially in need of such assistance is any cellular phone. Again, even if the phone is not activated, it can be used to call 911. One disadvantage is that it does require the user to affirmatively dial 911, which might be difficult in an emergency. Also, batteries need to be charged on a regular basis, which means it’s not something that can simply be forgotten until needed. But since most people have old cell phones lying around, it is a zero-cost option. If you’re worried about someone, simply asking them to put an old phone in their pocket gives some assurance that they can call for help, even if they can’t access their normal phone. In fact, it’s not a bad idea to keep an old phone, along with a 12 volt cord, in your car as a backup communications method in an emergency.

The picture at the top of the page of the 1973 system is from the November 1973 issue of Elementary Electronics.



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1963 British Two-Tube Regen

1963NovPracWirelessSixty years ago this month, the November 1963 issue of the British journal Practical Wireless carried complete plans for constructing this handsome two-tube shortwave receiver. A transformer and solid state rectifier allowed it to be run from the AC mains. An acorn tube served as detector, with a dual triode supplying two stages of audio amplification for loudspeaker volume.

The set could tune 1.2 MHz to 100 MHz (or even lower, although each band would be quite narrow). For general use, the magazine suggested a coil covering 7-22 MHz, and perhaps a second one for 2-5 MHz. Coils could be wound on old tube bases, and complete coil data was included.

Since the set was designed for beginners, the blueprint also included a wealth of data useful new SWL’s, such as a list of stations, frequency allocations, and the Q-code.

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Ergonomic 1938 Radio

1938NovPSThis young woman is now a centenarian, but in November 1938, she was shown in that month’s issue of Popular Science showing off the latest in ergonomic radio receivers. This pushbutton set (the brand name of which is not shown) could be used in two configurations. With the radio sitting on one side, the controls were handy to those who were seated. But tipped up, the radio was easily tuned by a person standing.



Postal Zones Introduced: 1943

1943OctNRNEighty years ago, the U.S. Post Office Department introduced postal zone numbers in the 124 American cities shown here. These were the predecessors of the ZIP Code, introduced 20 years later in 1963.

The number was written after the city, but before the state. When the ZIP code was introduced, these zone numbers became the last two digits of the ZIP.

This list appeared in the October 1943 issue of National Radio News, which reminded readers to use add the code 9 between “Washington” and “D.C.” when mailing lessons and other items to the National Radio Institute.



1953 One-Tube Novice Receiver

1953OctRadioNewsSeventy years ago this month, the October 1953 issue of Radio News showed how to build this one-tube regenerative receiver, especially designed for the Novice. It used a single 6SN7 dual tube, which served as regenerative detector and audio amplifier.

The previous month’s issue of the magazine had showed a companion transmitter and power supply, and the receiver used that same power supply. Since the power supply was regulated, the receiver was extremely stable, and the article pointed out that a crystal-controlled signal sounded like it was crystal controlled, unlike many regenerative receivers, where you couldn’t really tell the difference.

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1938 Two-Tube Pushbutton Set

1938OctPM2This handsome little two-tube receiver graced the pages of Popular Mechanics 85 years ago this month, October 1938. It uses two dual tubes, so it has the performance of a four-tube set. One tube appears to serve as RF amplifier and detector, with the other one providing two stages of AF amplification to drive the speaker. The set was billed as being perfect for an extra set around the house, as a traveler’s companion, for the sick room, or for the office desk.

Tuning was accomplished with a (now unobtainium) pushbutton unit, which contained trimmers for individual stations. An alligator clip connected to the antenna (through a fixed capacitor and without a ground, as the chassis was hot).

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