Monthly Archives: September 2022

1947 AM-FM Bendix Facto-Meter

1947SepRadioRetailingSeventy-five years ago this month, the September 1947 issue of Radio Retailing carried this ad for an interesting AM-FM receiver. The set, a mostly normal AM-FM superhet, wasn’t for sale to the public. It was instead billed as an instrument for use by the dealer to stimulate sales. The compact receiver could be taken to the prospect’s home to demonstrate how well FM signals could be received.

It had a signal-strength meter with two adjustable ranges, as well as a means for switching between the built-in telescoping antenna, and an outdoor antenna. Therefore, it was possible to tell whether an antenna would be necessary, and the best spot in the house to mount the set.



Broadcasting for Servicemen Overseas: 1942

1942Sep28BCEighty years ago today, the September 28, 1942, issue of Broadcasting carried this article on the subject of getting American broadcast programs to servicemen overseas. Elsewhere in the magazine, it was reported that the Office of War Information was purchasing time on broadcast stations in Alaska and Hawaii to get programs of interest to military personnel there. But overseas, the problem was more accute.

In Europe, the BBC, of course, carried programs in English. But other than the news, programs were generally regarded as quite dull to the American ear. Shortwave didn’t fill the gap entirely, because of propagation and the lack of receivers on base. One plan under consideration was a string of 50 watt stations near bases, all on the same frequency. Of course, thought had to be given to camouflaging them and shutting them down in case of air raids.

Morale kits were in heavy demand. The goal was to provide one kit for each 116 men. These included a radio for long, medium, and short waves, for either battery or plug-in use, one phonograph, 25 transcriptions of radio shows, and 48 records containing the latest hits. These were dubbed the “B Recreation Kit,” although I haven’t found any references using that terminology.

The soldiers shown at left are listening to a phonograph that was part of one such kit. Interestingly, due to shortages of shellac, the records supplied by Uncle Sam were actually vinyl 78 RPM discs, and were one of the first uses of vinyl for phonograph records.



1955 Grocery Prices

1955Sep27PghPressFor a snapshot of grocery prices in 1955, this ad appeared in the Pittsburgh Press September 27, 1955. The prices look low, but according to this online inflation calculator, one dollar in 1955 was the equivalent of $11.05 in 2022 buying power. So the two loaves of bread for 29 cents works out to $3.20 today, or $1.60 for a one-pound loaf. How does that compare to today’s prices, at the link below?

Of course, the 1955 bread included a coupon for dime off a cake or pastry. Margarine was 33 cents a pound, the equivalent of $3.64 today. And Velveeta cheese was 2 pounds for 89 cents the equivalent of $9.83. How do those compare to current prices?



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1947 Homemade Television

1947SepRadioNews2Seventy-five years ago this month, this viewer was undoubtedly the first on her block to have a television, courtesy of a design contained in the September 1947 issue of Radio News.

The magazine contained detailed plans, and suggested that the set could be constructed in one of three ways. The experienced constructor could employ the usual method of following the schematic, aided by photos of the completed set. For larger groups, it could be done with a series of step-by-step instructions prepared by an instructor. Finally, it could be done by a group using typical factory production methods.

Whichever way they decided to make the 18-tube set, the builders would become acquainted with the basic requirements of both video and FM sound reception. The schematic was shown in the magazine, but for those desiring factory-sized blueprints, they were available from the author for $1 per copy.

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1952 3-Tube Pocket Radio

1952SepPSSeventy years ago, this gentleman undoubtedly had the smallest radio in the ballpark to pull in the play by play, thanks to this miniature radio described in the September 1952 issue of Popular Science.

A few years later, the same circuit could be duplicated with transistors, but this one relied upon acorn tubes designed for hearing aids. The earphone was also one designed for that purpose. The three-tube set featured a regenerative detector, and the regeneration control could be used as a volume control, but only over a limited range. For more volume, the article suggested clipping the antenna to a larger metal object. For normal use, a 3-foot wire served as antenna.

The radio was mounted in a small plastic box said to be about the same size as the proverbial cigarette pack.1952SepPS3

The set featured permeability tuning. The coil had to be wound at home, but the author showed how to do it easily with a hand drill clamped into a vice.

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1952 Electronic Organ

1952SepPracWirThis maestro is playing a tune thanks to the electronic organ described in the September 1952 issue of the British journal Practical Wireless.  It employed six tubes, including rectifier, and was suitable for either home or professional use. It could play only a single note at a time, and the player here is playing the tune with his left hand. It had, however, a number of effects such as vibrato, and he is controlling them with switches on the right hand. The keyboard covered two octaves, but since a switch shifted the range, the instrument was capable of four octaves.

The difficult part was obtaining a keyboard. The magazine noted that some builders might be lucky enough to find a discarded accordion and use its keyboard. But for those not so lucky, the magazine included construction details for making your own.

While building one of these might be a fun project today, we have to admit that you can do a lot better just buying one.  All of these have many more features at a much lower price.  But none of them glow in the dark with six tubes:

 



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1952 Three-Tube Converter

1952SepRadioNewsThe gentleman shown here is now about 80 years old, but in September 1952, he was in Nebraska, pulling in Guam on an inexpensive broadcast radio, thanks to the converter described in that month’s issue of Radio News.

He’s quite possibly the son of author Stan Johnson, W0LBV, who was previously featured here.  According to the author, the setup was the answer for a novice looking for an inexpensive but well performing receiver, or for the old timer who needed a second set. Despite the low cost, it was said to give $100+ communications receivers a run for their money. It could be used for any band between 160 and 10 meters with suitable coils, but the construction article specifically showed how to wind coils for 80 and 11 meters, the bands open for novices at the time.

The output of the converter was at the top of the standard broadcast band. It included a BFO to allow reception of code signals.

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1972 One-Tube Receiver & Two-Transistor Transmitter

1972SepEIFifty years ago, the September 1972 issue of Electronics Illustrated carried this sampler of small projects for the electronic hobbyist. Of course, of special interest to our readers is the one-tube receiver shown at the upper left. The regenerative set, using a 1U4 tube tuned the broadcast band and 3-14 MHz in three bands. In addition to a flashlight battery to light the filament, it used a 45 volt B battery.

Also of interest was the two-transistor QRP transmitter that put out one watt on 80 meters. The author, Herb Cohen, pointed out that the little rig was “just the ticket for QRP contests, field trips and any other time you really want to pit your savvy against the vagarities of radio communications.” The set ran on 12 volts.

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Pilotuner T-601 FM Tuner, 1947

1947SepRadiocraftSeventy-five years ago this month, the September 1947 issue of Radio Craft sang the praises of the Pilotuner model T-601 FM tuner, designed to cover the new FM band. The set had audio output, so could be plugged into the phono jack of a standard broadcast radio or into a phonograph. Priced at only $29.95, it was predicted to be the thing to bring FM out of the luxury class and make it available to the average man.

Those with prewar FM sets that covered 42-49 MHz could simply add the new tuner without making “complicated and costly conversions.” It had a built-in antenna that could be used in strong signal areas, and it had provision for hooking up an external antenna.

It had a power transformer, which was an important feature, since it was isolated from the power line. This meant that it could be hooked to an AC-DC set without having to worry about polarity.

In tests in downtown Manhattan, the set functioned well with the built-in antenna, with no signs of frequency drift. Two strong stations separated by only two channels (in other words, 400 kHz) were easily separated.

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1952 3-Tube Broadcast/Shortwave Regen

1965SepRadioElecSeventy years ago this month, the September 1952 issue of Radio-Electronics carried the plans for this miniature regenerative receiver covering three bands with the convenience of band switching. The coil was wound by the builder, and different windings were switched in to cover the broadcast band, 1.5-4 MHz, and 6-16 MHz. The set was 7.5 inches deep, 6 inches long, and 1.5 inches high, and housed a 7H7 regenerative detector, with the audio being amplified by a 6SQ7 and 6F6. It was billed as being suitable for “signal monitoring, dial-twirling, or emergency standby service.” In addition to 6.3 volts for the filaments, the set required a power supply of 180-250 VDC.

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