Category Archives: Radio history

The First CB Transceiver

StonerArticle

In an earlier post, we saw the Heathkit CB-1 CB transceiver.  The CB-1 was actually released before its more famous amateur radio cousins, the Sixer, Twoer, and Tener.  And it turns out that the CB-1 was actually copied from a popular construction article.

Kathi Martin, 1975.

Kathi Martin, 1975.

I was unaware of this until I noticed an item in a 40 year old issue of Elementary Electronics magazine by CB radio editor Kathi Martin, KGK3916.  In her column “Kathi’s CB Carousel” in the May-June 1975 issue, she talked enthusiastically about the FCC’s proposal to establish a “communicator” class of amateur radio license.  The proposal was never adopted by the FCC, but Martin’s enthusiastic embrace of the proposal revealed what most hams believed to be true.  Licenses would be “yours almost for the asking,” and would open up the two meter band to the unwashed code-free masses.  And most tellingly, she admits what most hams already knew:  The FCC proposal for the communicator license, “if read carefully, is CB.”

The proposal never went through, mostly because hams resisted it for exactly that reason.  I’m sure I read her column 40 years ago, and if I did, I’m sure I was outraged by her frankness.

Time must have mellowed me a bit, since reading the article today, it is a good beginner’s look at what two meter FM was like in the 1970’s, and I can understand that CB’ers like Martin would have looked forward to the possibility of migrating from the bedlam that reigned on 11 meters in that era.

But I also noticed a reference that I hadn’t seen before: “If the CB clubs–and individual CB’ers–don’t louse things up with a big mouth [which apparently they did, since the proposal didn’t go through], we CB’ers are going to wind up with the best deal since Don Stoner’s magazine article ‘exposed’ class D CB to the general public–creating a billion-dollar industry.”

Having never heard of Don Stoner or his magazine article, I did some research and found it.  She’s undoubtedly referring to a construction article that appeared in the March 1959 issue of Radio News. (Stoner was licensed as a ham as W6TNS, and was involved in the first OSCAR satellite.)

CB radio took over the former 11 meter ham band (which had only come into being after the war, and was shared with diathermy machines) on September 11, 1958.  None of the major electronics magazines made much fuss about it initially.  It doesn’t seem to be mentioned in Popular Electronics until the March 1959 issue.  That article is a very matter-of-fact look at the new service, and a review of the few pieces of equipment that were then available.  Electronics Illustrated carried a few articles about the new service in the June 1959 issue.  In these articles, Electronics Illustrated went out of its way to stress that CB was not intended as a service for hobbyists nor as any kind of replacement for amateur radio.

Stoner’s article, however, announced the presence of the new bandwagon, and invited everyone to jump aboard.  He enthusiastically starts:

Did you know that now you can build a radiotelephone transceiver and talk on a short-wave band without having to obtain an amateur radio license? The recent FCC decision to open the 11-meter band to Class D Citizens Band operation makes it possible for anyone (except those under 18 and aliens) to own and operate a short-wave transmitting and receiving station.

He then goes on to point out that 11-meter signals “can travel to the far corners of the earth. It is not at all uncommon to hear stations coming in from clear across the country every day during the winter and on most days during the summer.” He even concludes the article by wondering “who will be the first to issue a certificate for ‘Worked All States–Citizens Band (WASCB)?”

Whether or not the FCC intended it, Stoner certainly let the cat out of the bag as to the hobby potential of CB radio.  And in the absence of much commercial equipment, he describes how to construct a 5-tube transceiver which is (with the exception of the power supply) identical to Heathkit’s later CB-1.

Even though the FCC probably didn’t intend it, Stoner was correct in his interpretation of the rules.  Those original rules failed to include a number of provisions that were added in later years.  For example, initially, licensees were allowed to build their own transmitters.  There was no explicit prohibition on hobby use.  And the restriction on maximum distance of communications did not appear in the initial rules.  So Stoner was right, and someone could very well have offered a WAS-CB certificate, and this would have been a perfectly legitimate activity.

Stoner’s design was apparently popular, as evidenced by Heathkit’s wholesale adoption.  In fact, it was so popular that the non-selective superregenerative receiver quickly became useless on the crowded band, and many of the CB-1’s were converted to six or two meters by hams.

(Any hams who are still bitter about the “loss” more than 50 years ago of a ham band that had only been theirs for a little over a decade should take note of one important fact:  Stoner’s transceiver is quite simple.  But it’s probably beyond the construction skills of most hams today.  Yes, the CB’ers of 1959 were probably more technically adept than hams today.)

It appears that Kathi Martin was right in her 1975 column.  The other electronics publications initially took a very cautious view of CB.  But it looks like Stoner’s article really was the one that exposed the unwashed masses to the possibilities of CB.

(The QST announcement of the end of 11 meters for hams can be found in the QST archive.)

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Art Imitates Life, 1945

CardboardRadio

 

If the cardboard radio shown here looks vaguely familiar, then you are a faithful follower of this blog. The photo on which this was inspired appeared in Life Magazine on December 11, 1944, and on this blog a few months ago.

 

The Life photo inspired modern dance students in Westchester County, New York, to compose a ballet based upon the photos in the Life article. This rendition appeared in the same magazine 70 years ago today, May 28, 1945.

 

 

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D-Day Army Radio Link

RadioCraftMay1945

In an earlier post, we looked at a 3-element VHF yagi shown in a historical photo of the Siege of Bastogne in December 1944. It was part of a U.S. Army Signal Corps FM relay which linked the isolated forces to the Army landline telephone network.

A similar setup was used a few months earlier on D-Day, as shown from this diagram in the May 1945 issue of Radio Craft magazine.  The link shown here was operational the second day after the initial Normandy landing and carried facsimile and voice traffic from London to the front. Within a few months, additional stations were added to the network, and the magazine notes that the network thus established covered an area equivalent to that from New York to Chicago and Detroit to Atlanta.

The army primarily relied upon wire communications, but even on the continent, radio links such as these provided an important backup function. On one occasion, the main cable across France had been cut, but nearly 2709 messages were handled during a 24 hour period.

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1958 Conelrad Monitor

1958PEconelrad

An article in the February 1958 issue of Popular Electronics admonishes that “all of us should use a receiver that warns when the Conelrad alert begins,” and the magazine offered a simple circuit, shown here. The concept was about as simple as possible: The little self-contained receiver monitored continuously. If the carrier of the local station disappeared, then a buzzer would sound.  Since all stations (other than designated stations on 640 and 1240) were required to leave the air during a CONELRAD alert, this would warn the owner of an impending attack.

It would seem that this particular design would be prone to false alarms. Obviously, it would work only with a 24-hour station. Otherwise, when the station signed off each night, the buzzer would sound until morning. And even most 24-hour stations signed off occasionally for transmitter maintenance. These periods often took place early Monday mornings, so someone relying on this receiver would probably get some rude awakenings if the receiver was left on.

And even though the receiver drew minimal current, it would probably go through the three penlight cells quite quickly.

But since hams were then required to monitor Conelrad, the receiver might have served a useful purpose, even though it probably wouldn’t work too well in continuous service.

1958PEconelradSchematicAs can be seen from the circuit here, the CK722 served as detector, and the 2N170 was hooked up to a relay, which would turn off the buzzer when the station left the air. The author, I.C. Chapel, notes that the relay is set to trip at 6 mA. At the conclusion of the article, there is an editor’s note stating that this figure “amazed” them, and concluded that the author must be very close to the broadcast station to get these results with his 10-foot antenna. One editor constructed the unit and tried it about 25 miles from New York City, and none of the stations there was strong enough to make the circuit work. With a more sensitive relay and a 150 foot antenna, though, they were able to get it to work with a 250-watt station 10 miles away.

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Another 1950 Boys’ Life One Tube Receiver

1950JanBLreceiver

A few months ago, I posted about a one-tube regenerative receiver from the September 1950 issue of Boys’ Life magazine. I was even sent some photos of a very similar receiver discovered by Jon, WS1K. That receiver covered short wave, I’m guessing about 3-6 MHz.

1950JanBLschematicInterestingly, I overlooked this one-tube receiver appearing in the same magazine a few months earlier. In the January 1950 issue of Boys’ Life appeared this one-tube receiver. The article was written by one of the same authors as the September article, Glenn A. Wagner. The January receiver appears to cover the broadcast band, since it calls for a “standard replacement antenna coil” along with a 365 uF variable capacitor. It uses a single 1N5G tube with a 1.5 volt battery for the filament, along with a 45-90 volt B battery. It’s all mounted on a 5×7 pine board.

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1926 Boys’ Life Crystal Set

1926BLxtalset

The January 1926 issue of Boys’ Life magazine contains the plans for this simple crystal set. According to the article, the parts would set the Scout back about 80 cents, not counting the headphones, which would cost about $3.00. The parts could be found at “any well-stocked five and ten cent store,” and the receiver was said to pull in stations up to twenty miles.

For those wishing to duplicate this or similar receivers, if your five and ten cent store isn’t sufficiently well stocked, you can get some ideas on locating the parts on my crystal set parts page.

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Dr. Norman Barden 1892-1926

The June 1911 issue of Modern Electrics magazine carries an interesting article written by one Norman Barden, detailing experiments being carried on at East High School in Minneapolis. Among other things, the reason why the article caught my eye was that this school was the predecessor of my alma mater, Minneapolis Edison.

East High was opened in 1900 and operated under that name until 1927, at which time it was used as a vocational school for a number of years. It was located between University Avenue and Southeast Fourth Street on what was then First Avenue Southeast, which was later renamed Central Avenue. Edison opened in 1922 and Marshall High (in whose old building I had my office for a number of years) opened in 1924, eliminating the need for East High. So in a sense, I went to the same school.

Barden starts his article by pointing out that the “public has been startled” to learn that a high-frequency current can pass through the human body with no ill effects. He explains that “there are several different theories put forth to explain why high frequency current does not produce fatal results upon animals and the human body,” even though the same current and voltage at a lower frequency or at DC, “fatal results occur.”

BardenTeslaUndaunted by the possibility of fatal results, and apparently oblivious as to the reason why they were non-fatal, Barden went ahead and sent the potentially fatal currents through humans, including himself, as shown in the picture here.

(It turns out that the explanation for the non-lethality is somewhat mundane.  The equipment appears to be an ordinary Tesla coil, meaning that while the voltages are very high and will generate a most impressive spark, the current passing through the human subject is extremely small.)

It turns out that this wasn’t the only dangerous science going on at East High.  Mr. Barden was apparently shooting guns in the photography lab, as detailed in other published articles.  In articles in the May 1911 issue of Popular Electricity and the 1914 Journal of the U.S. Artillery, he publishes photos of bullets photographed in flight after being shot from a .22 caliber rifle and a .32 caliber revolver.  Not surprisingly, he points out that when you fire guns at school, “a back-stop must be provided to keep the bullets from penetrating the wall.”  He used a piece of boiler plate behind a 2-1/2 inch piece of wood.  He also points out that you need to be careful, since you’re doing the experiment (including firing the gun) in a totally darkened room.  If you are going to replicate his experiment, it’s probably not a good idea to walk around after turning out the lights.  Barden is shown below with his co-experimenter, Loyle Dobbs.  The 1914 article also appeared in Scientific American.

BardenDobbs

As you can see, the rifle is plainly visible in this photo.  Apparently, East High didn’t have a “no guns” sign on the front door.

In addition to these publications, Barden also had published in a 1910 issue of Popular Atronomy a photograph of a comet he had taken through a telescope he had constructed himself.

When I saw the original article, I assumed that Mr. Barden was a teacher at the school.  But it turns out that he was actually one of the students.  A hundred years ago, high school students could get their articles published in Scientific American.  Today, they’re not allowed to touch the experiments.

BardenYearbookThe first record of young Mr. Barden is an article in the the June 14, 1906 Minneapolis Journal, where he is listed as a seventh grade student at Holmes School.  He’s shown here in his East High yearbook photo, which shows that he graduated in January, 1912.   In 1913, he is listed as a sophomore at the University of Minnesota College of Science, Literature, and the Arts.  And in 1919, he graduated from medical school in Ohio.

He returned to Minneapolis in time for the 1920 census, and went into practice.  In this 1921 directory, he is shown as having an office in the Donaldson Building and a home address of 1209 7th St. SE.  According to the 1921 Journal-Lancet of the Minnesota State Medical Association, He was the assistant to Dr. C.D. Harrington, a “pioneer in the therapeutic use of radium and the x-ray,” and the rongenologist of Northwestern, Asbury, Abbott, and St. Mary’s Hospitals.

Unfortunately, Dr. Barden’s promising scientific career came to a tragic end with his mysterious death in 1926.

The newspapers of August 18, 1926  reported that one Mrs. J.D. McDermott, the wife of a Chicago millionaire contractor, was being held by Minneapolis police following Dr. Barden’s death. His body was found by police in a room occupied by the couple in a downtown hotel. According to news accounts, the doctor was found “fashionably dressed and wearing several diamond rings said to be worth more than $10,000.” Two days later, the papers reported that Mrs. McDermott had been released, the post mortem having determined that the doctor had actually died from “acute alcoholism.”

Dr. Barden is buried at Lakewood Cemetery in Minneapolis.

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Morkrum Code of 1915

MorkrumTape

Many hams and others will instantly recognize the picture above as being the tape from a teletypewriter machine.  The machines were capable of sending faster than operators could type, so to reduce transmission time, the message could be punched onto the paper tape shown here and fed into the machine for later transmission.  I remember such devices still in use into the 1980’s by hams using radioteletype (RTTY), and the machines invariably originated from landline telegraph systems.

And most hams who look at the image closely will immediately notice that it’s a 5-bit code, and they will probably proclaim pretty quickly that it’s Baudot, since the Baudot 5-bit code was in use for many years.

They might be surprised to learn the age of this particular tape, and they will also be surprised to learn that it’s not Baudot.  This tape is a hundred years old, shown here from the May 1915 issue of Electrical Experimenter.  The technology was relatively new at the time, and the accompanying article describes it in some detail.    The particular tape shown here came from 1915APoperatorthe Associated Press, and is the beginning of a news item.  The AP New York office sent out 32,000 words a day over the wire, and this type of automation was necessary to handle the volume of news.  During the office’s busiest hours of the day (11:00 AM – 1:00 PM), three or four operators were perforating tape simultaneously so that these tapes could be fed into the machine that sent them out.  One of those operators is shown here.

MorkrumCode

And despite the similarities, the code being used in this tape is not Baudot.  It turns out that standardization didn’t take place for a few more years.  The code shown here is “Morkrum Code.”  If you look closely, you’ll see that the code for the letter A appears to be the same.  And like Baudot, it required the operator to shift from letters to characters and back again.  But the encoding is different.  If you’re interested in the history of the various codes in use, you’ll find them in an article entitled The Evolution of Character Codes, 1874-1968 by Eric Fisher.

The code that’s undoubtedly bringing these words to your screen are the ASCII code, an 8-bit code which came into use in the early 1960’s.  But the basic idea has been around for over a century.

The tape at the top of the page, read from right to left, reads as follows:

MER PAWNEE.  PHILADELPHIA. TO THE CLYDE
S S CO. WITH MDSE PASSED IN QUA

This scrap of tape appears to have originated five years earlier, since this snippet appeared in the shipping news of the  New York Tribune on August 25, 1910, in the clipping shown below.

1910ShippingNews

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1925 Portable Radios

PortableKodelP11Ninety years ago this month, May 1925, Radio in the Home Magazine featured a number of portable sets then available on the market. The young woman shown here is listening to the Kodel P11 one-tube model, which measured only 5-3/4 x 4-1/4 x 3 inches, and which would operate either with or without an aerial. It appears that this is the portable version of the model C11, some pictures of which are available at this link.

The Kodel listener is anonymous, but that is not the case of the young woman shown here in her fur coat getting ready to listen to her Crosley portable. She is Miss Phyllis Sacia of Galesville, Wisconsin, who was the winner of the 1925 Crosley-Dolly Varden Annual Beauty Contest. According to her 1953 obituary, she married the year after this picture was taken and taught home economics in Menomonie, Wisconsin.PortableCrosley

Finally, the young woman shown in the final photograph below appears to be listening to an ordinary home set. But this set, the Operadio convertible, had a special cabinet which allowed the radio to be removed and used as a portable. A surviving example of this six-tube TRF set can be found on this website.  The article warned that “there is a saying in the radio industry that you can put a strap and a handle on a grand piano and call it a portable instrument if you want to.” That advice might have applied to this set, which weighed in at about 40 pounds.

PortableOperadio

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Cecil Powell, 1WX, 1915

CecilPowellOne hundred years ago this month, the May 1915 issue of Wireless Age carried this photo of the station of Miss Cecil Powell, 1WX, of Hartford, Connecticut. She owned and operated this 1/4 kW station, and the article notes that she had passed the First Grade Amateur License and was working on the First Grade Commercial License. She was said to be the “only girl wireless operator in Connecticut.”

The accompanying article is written by Miss Powell, who explains that she was a stenographer employed by an inventor, but doesn’t name the inventor. The inventor, it turned out, was Hiram Percy Maxim. She notes that her employer had a station, and that she enjoyed listening to his discussions of the radio art. Maxim and a friend asked if she would like to be the owner of her own station, and she answered in the affirmative. She describes the station and antennas.

Miss Powell, with the encouragement of Maxim and his wife, conducted classes for other women interested in wireless, and every one of her students went on to pass the license exam.

Over the years, Miss Powell served as an officer of some of Maxim’s companies, such as the Maxim Silencer Company. I didn’t find any references to her in QST, other than as the notary in one of the statements of circulation.

References

 
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