Category Archives: Radio history

Wartime Emergency Radio Service (WERS)

1943JuneRadioCraftCoverSeventy-five years ago this month, the June 1943 issue of Radio Craft carried a cover feature on the Wartime Emergency Radio Service (WERS). Within a day of Pearl Harbor, hams were off the air, but there was still a need for communications during civil emergencies, and WERS was devised to fill the need.

A New York mobile WERS installation.

A New York mobile WERS installation.

Local governments were granted licenses for use of the 2-1/2 and 1-1/4 meter bands, and it was primarily hams who were called upon to serve as operators.  In most cases, it was also the hams who built the equipment, such as this 1944 WERS transceiver.



WW2 Clandestine Dutch Receivers

Another collection of clandestine Dutch radios.

 

AnneFrank1940 crop.jpg

Anne Frank. Wikipedia image.

On this date seventy-five years ago, June 15, 1943, Anne Frank noted in her diary that everyone in Holland had been directed to turn in their radios.  She noted that throughout Holland, people were scrambling to find old radios to turn in so that they could keep another set, and that those in her group had arranged to get a small secret set.

As we have written previously, some ingenious examples of clandestine Dutch receivers are shown above.

 



KOA Denver, 1943

1943June14BCSeventy-five years ago today, KOA Denver ran this ad in the June 14, 1943, issue of Broadcasting.

The station ran its weekly “Music Center for Enlisted Men” for the morale of servicemen stationed in the Denver area. The half hour program ran Friday nights, and enlisted men participated in choirs and dramatic presentations. The project was spearheaded by the wifes of commanding generals and post commanders in the area, along with Colorado’s governor and his wife.

 



AM Radio Direction Finding

1958JuneRadioElecSixty years ago this month, the June 1958 issue of Radio Electronics carried the plans for this transistorized radio compass.

The circuit was nothing more than a superheterodyne receiver covering the standard broadcast band and, if desired, the longwave band. It was specifically designed for use as a radio compass. Any portable AM radio with a loopstick antenna can be used for the same purpose, although the magnetic compass mounted directly on the case made use of this one quite convenient.

The article specified that it was a worthwhile investiment for “people interested in outdoor activities such as motorboating, sailing, hunting, trapping, berry picking, camping, hiking or other activity where there is a possibility of getting lost.”

Even with this modest receiver, or even the most inexpensive AM transistor radio, the method of locating yourself is actually extremely accurate. All you need is an AM radio and a good map marked with the locations of local broadcast stations. The ferrite core antenna coil is mounted parallel to one of the sides of the case of the radio. Fortunately, the vast majority of inexpensive radios were also built this way. The antenna is very directional, and produces a sharp null when the length of the antenna is pointed directly at the station.

To use as a direction finder, the radio is placed on the map, and with the compass, the map is oriented to the map. The radio is turned until the signal fades out. At that point, the side of the radio is used as a straightedge, and a line is drawn through the radio station.

This process is repeated with a second station. The point on the map where the two lines intersect is your location.

I’ve tried this method using an inexpensive transistor radio, and the accuracy is astonishingly good. In an urban area, I can generally find my location within a few hundred yards. At night, using distant signal clear channel stations, I can determine my location within about twenty miles.

The exact location of a radio station’s transmitter (which might be different from its city of license or studio location) can be looked up at the FCC website.  Once stations are found, their latitudes and longitudes can be plotted on a map, or even on graph paper. With a bit of practice, you will be able to very accurately determine your location with very minimal equipment.

Of course, a GPS receiver will give more accurate results much more easily.  But the GPS receiver depends on GPS satellites being operational, which might not be a given in some emergency situations.  Also, if the sky is obscured by heavy foliage, a signal might be unavailable, but AM radio signals would come in loud and clear via ground wave.  As long as at least two AM radio stations are on the air, an AM radio can tell you your location quite accurately.

I’ve found that a few of the local broadcast stations seem to give an inaccurate bearing. It’s possible that some of them moved their transmitter site without telling the FCC, or possibly that station’s signal is being reflected by some nearby object. To get a precise location, I plot several bearings on the map, and ignore the one that seems not to intersect the others. The other lines are generally very close together, and I estimate my position based upon where those other lines converge.

More information about this method of direction finding can be found at this post.



N9ZGB QSL Card, 1938

n9zgbHere’s an unusual example of an “N” amateur call sign from 1938, from the June 1938 issue of All Wave Radio magazine.  The card was actually for a QSO by W9GZB, but the owner of that call, Arthur “Musty” Musgrave, 527 Union St., Emporia, Kansas, was a member of the Naval Communication Reserve, for which the corresponding “N” call sign was used. That service dates back to at least 1929, since there is an editorial in the August 1929 issue of QST encourage amateurs to consider enlistment.

According to an editorial in QST for August 1940, the Naval Communication Reserve was open to men aged 15-35. Former servicemen in any branch of the military were eligible up to the age of 50. Amateur radio operators could enlist as seamen and were immediately eligible to take the examination for the radioman rating. Physical fitness requirements were the same as those for the regular Navy. Experienced radiotelegraph operators were especially desired, since the need for signalmen at the time exceeded the need for radiomen.

Musgrave, the sender of this card, was a linotype operator with the Emporia Gazette newspaper. According to the December 20, 1940, issue of that paper, he was called up to service in 1940 and assigned to the San Diego naval base.  After the war, Musgrave’s call became W0ZGB, which he held until at least 1960.  He died in Kansas in 1971.

The signature on the left-hand margin of the card is the reason why the QSL was shown in the magazine.

This is the signature of William Allen White. W4DVO had sent it to the magazine along with the story of working Musgrave on 80 meter CW. After copying the QTH, the Florida station mentioned that Emporia “owed its place on the map to William Allen White.” To that, Musgrave replied, “you’re telling me!”, and told the Florida contact that he had worked for him for over twenty years. To prove the point, he had his boss autograph the card. According to the magazine, “something tells us that ZGB is going to be a popular station with the autograph hunters.”

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William Allen White. Wikipedia image.

William Allen White was, indeed, the owner and editor of the Emporia Gazette, where Musgrave worked as a linotype operator.  White, was regarded as a spokesman for Middle America and was dubbed the “Sage of Emporia.”  Earlier a supporter of Teddy Roosevelt’s run for President on the Bull Moose ticket, he was later tapped by FDR to help generate support for the Allies before America’s entry into the Second World War.

 



KNX Victory Garden, 1943

1943Jun7BCShown here is the victory garden of KNX, Los Angeles. The picture appeared 75 years ago today in the June 7, 1943, issue of Broadcasting magazine.

According to the ad, the station went to work after the call went out from Washington to raise vegetables. It noted that the soil under glamorous Hollywood had been, just a few years earlier, fertile farm land.

So the station ripped out the terrace in front of its studio, plowed the soil, fertilized and cultivated it. As a model to its listeners, the station grew vegetables to show what California was capable of.

The station’s first crop went to the Los Angeles Orphans’ Home. The practical experience of growing crops went by proxy to many thousands of listeners.



High School Radio Training, 1943

1943JuneQSTShown here in the June 1943 issue of QST are students at Northbridge Senior and Junior High Schools, Whitinsville, Mass., learning Morse Code under the tutelage of assistant principal James Perkins Saunders, W1BDV.

Before the War, there had been some instruction in radio for interested students, but it had consisted mostly of informal coaching of students interested in obtaining their ham licenses. But with war, radio became a vital skill, and the school vigorously undertook pre-induction training in the radio arts, including both theory and Morse Code.

1943JuneQSTKeyTo accommodate code training, the school’s schedule was adjusted. Two minutes were shaved off each of the seven class periods, and the lunch period was reduced by one minute. This allowed the time period from 8:05 to 8:20 AM to be set aside exclusively for code practice. Each day, Saunders manned the key in the school office, as shown here, and code was piped throughout the building. Later, a tape machine was procured, and Army-Navy code training tapes were played. A student assistant monitored the tapes and copied along, and at the end of the session, he read back the text that had been sent.

The code training was intended primarily for students in the high school, but since the P.A. system was shared with the junior high, the younger students were also encouraged to participate.

Participation was optional, and some students used the period as a study hall. Initially, 250 students were participating, but this number dropped to 75 at the end of the term.  Each week, a test was given, and teachers sent the classroom’s copy to the office for scoring.  At the start of the next term, the program again started from scratch, with advanced students moving on to a dedicated 45 minute class.

1943JuneQSTMillThe typing class, shown here, was conducted by Saunders one day a week. Instead of their normal typing lesson, the students listened to code being sent by Saunders, and they learned to copy on the “mill”.

Other typing students were trained to transcribe the paper tapes being used to run the code machines. They intently watched a character of the tape be revealed and typed the corresponding letter. Many students were particular fond of this activity, and expressed disappointment that the fun ended when the bell rang.

Students were also trained to copy by flashing light. After they had mastered copying code by sound, they were instructed to watch a flashing light which flashed along with the aural code. Then, the sound was turned off, and they continued to copy by sight.

Sending practice was also given, with sending stations being set up on old laboratory tables. These were wired up so that students could listen to perfect code from the machine and then listen as they tried to duplicate the sounds with their own fists.

1943JuneQST4Interested students, both boys and girls, also took part in classes in radio theory, largely following ARRL study materials. By rounding up defunct receivers, they were able to scrounge components to build projects such as code oscillators, as the students here demonstrate.

Saunders reported that it had been a lot of work getting the school geared up to study radio, but he and the students were very enthused about it. He reported that the many extra hours spent at school working on it were a suitable substitute for ham radio’s being off the air for the duration. In fact, his wife reported that “it is even worse now than before the war” since he was at least at home–albeit in his shack–in the prewar years.



WTCN Minneapolis Remote Unit, 1948

1948JuneFM

This picture of the remote unit of WTCN radio in Minneapolis appeared in the June 1948 issue of FM and Television magazine. It operated in the 152-162 MHz range. According to the accompanying article, the FCC had moved the allocation for that service to the 450-460 MHz band, which caused some consternation for broadcasters, since equipment for that band was not yet available. Existing licensees would be able to continue on the old allocation for a few more years, but the cost of installing a new system would be prohibitive, since it could be amortized over only a few years, due to the pending change.

The WTCN system was provided by Link Radio Corporation of 125 W. 17th Street, New York. The mobile unit was a 50 FM transmitter operated by a 12 volt dynamotor. Twelve volts was chosen rather than six due to the power consumption and long duty cycle. It was also possible to switch over to operation from AC power where available. A vertical antenna was mounted on the roof.

At the receiving end, the station had a vertical antenna mounted on top of its FM broadcast antenna on the Foshay Tower, which was also pictured in the article. A rack-mounted receiver picked up the program for delivery to the station. Other types of antennas could be employed.

Bell 47B. Wikipedia photo.

For a history of the WTCN call sign, see this link and this link.  The station was owned by the Twin Cities Newspapers, hence the call sign.  Since the article is about the remote unit, there’s no explanation of the Minneapolis Star and Tribune helicopter shown next to it.  It appears to be a two-seat Bell 47B, as shown at left.



Claire Trevor, CBS Radio 1938

1938MayRadioNewsCoverUndoubtedly, most of the hams who bought the May 1938 issue of Radio News did so for the articles, such as the one on page 37 showing how to build a portable six-tube transmitter for 28 MHz. But the issue’s cover shows actress Claire Trevor at the CBS microphone, performing her role of Lorelei opposite co-star Edward G. Robinson in the series Big Town.

Miss Trevor is most famous for her film roles, including an Oscar for best supporting actress in 1948’s Key Largo. According to the magazine, she made her stage debut in 1930 and appeared in numerous Broadway plays. She made a number of film shorts before going to Hollywood in 1933.

According to the magazine, it was hard to say whether her popularity was due to moving pictures or radio, but that she was a talented, versatile, and beautiful artist.

She died in California in 2000 at the age of 90. Her only son, Charles, was killed in 1978 in the crash of Pacific Southwest Airlines flight 182.



1958 One Tube Transmitter

Screen Shot 2018-05-08 at 11.00.50 AMSixty years ago this month, the May 1958 issue of Popular Science showed how to make this compact one-tube transmitter for local or standby use. The set used a 117P7 or 117L7 tube, which combined a rectifier and pentode, to put out about six watts on 80 or 40.  Band choice was accomplished with plug-in coils, and the rig ran directly off AC power.

Since the Altoid tin had apparently not been invented, a card file box was used for the enclosure.

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