Electronic Oscilloscope Fundamentals
Basic signal measurements
"Sotelo started out taking food and drinks to the local deejays in Santa Ana in hopes of getting his foot in the door. Then, he was getting a haircut one day in 1991 when a family member ran over to tell him that a small station in Corona wanted to interview him for a job. He borrowed a car and got to the station at around 10 p.m. There, the program director asked Sotelo how much experience he had. Sotelo, who had none, lied and said lots. The program director asked Sotelo if he could do news. Of course, he said, even though he had no idea how to do news, or anything else in radio, for that matter."What I like about that story is that it's the same story as every DJ ever told me. Either they went to broadcasting school, or they were in college radio or they lied, or all of the above. Eddie came back the next day to start at 5:00 AM. He later lost the job because he didn't have a green card. So he moved to 102.9 KXLM in Oxnard but one day after his show, immigration officers were waiting for him outside. He was very lucky and he was able to get a work permit before he was deported. Since then he has broadcast his show from different points, Riverside, Santa Ana, and San Jose.
"...The Weird Circle was syndicated again decades later to independent stations on reel to reel tape. I know this because I found dozens of boxes of the tapes stored at KZSU Stanford in the early 1990s... They were probably originally sent in the 1970s when there was a resurgence of interest in OTR created by The CBS Radio Mystery Theater and Zero Hour. The actual stories sounded like they were the same 1940s recordings, but the introduction and closing segments had a different voice of an older man, and were probably re-recorded to allow a standardized point for commercials to be inserted..."For these reasons I agree with the Digital Deli data. More here and here. Radio archives agrees and puts the airing of the first program as Sunday, August 29, 1943, the last on Sunday, February 11, 1945.
"Styrene records get a bad rap because they don’t tend to stand up to abuse as well as vinyl discs. That said, in near-mint condition, there is no audible difference between a vinyl and a styrene 45."The material can be air-injected to make styrofoam, or made into food-wrap, or dozens of other more appropriate items. But when making records there is only one advantage. It's cheaper. There are two reasons it's cheaper:
They received "telegrams, letters and newspapers from scores of cities." apparently on that night reception was possible as far west as Terre Haute. Albany had notified many other Chamber of Commerce groups of the broadcast and many sent notices confirming reception."More than 1,100 members and friends of the Chamber of Commerce gathered in beautiful Chancellors' Hall in Albany to hear the speakers, musicians and other participants in the program at the radio broadcasting station of the General Electric Company in Schenectady (WGY). The audience was therefore assembled about twenty miles from the performers. The program consisted of piano, violin and soprano solos, followed by a radio telephone speech delivered by Roy S. Smith, Executive Manager, Albany Chamber of Commerce."
It's a low frequency radio halo. They continue to study the phenomena with LOFAR and LWA radio telescopes. More here."...a radio halo at low frequencies associated with the merging cluster Abell 521. This halo has an extremely steep radio spectrum, which implies a high frequency cut-off; this makes the halo difficult to detect with observations at 1.4 GHz...The spectrum of the halo is inconsistent with a secondary origin of the relativistic electrons, but instead supports turbulent acceleration, which suggests that manya radio haloes in the Universe should emit mainly at low frequencies."
A month later Marconi himself came to America and repeated some of his now famous experiments. So their work preceded even Marconi's own demonstrations in the new world. That team of San Franciscans included father Richard Bell, a Jesuit priest and Professor John Montgomery. Bell had studied theology in the 1890s in Rome. While there he had become interested in the work of Marconi. Marconi's earliest experiments date to at least 1888. Bell was so interested in these that when he returned to California in 1898 he brought with him a copy of Marconi's published accounts. He began replicating the small-scale experiments almost immediately."In 1899 a team of San Franciscans reproduced Guglielmo Marconi's method of communicating by radio waves and demonstrated its usefulness by sending a message in Morse code from a lightship anchored outside the Golden Gate to the Cliff House on the San Francisco Shore. This was the first wireless message broadcast on the West coast and the first ship-to-shore broadcast in the United States."
"A weekly broadcast for farm boys and girls "the 4-H Club Crier" will be sent on Thursday or Friday evenings by Co-operating stations."The second reference came from the The August 23rd 1928 issue of the Tulia Herald, of Tulia Texas. It reads as follows:
"A large-scale demonstration of radio's effectiveness in influencing rural thought and action will be carried on for a period of 30 weeks starting October 1, by some 60 radio stations and the Radio and Extension services of the United States department of Agriculture.. the national program will supplement State 4-H Club radio programs carried on by a number of land-grant colleges..."The article later claims that 61 stations in 38 states requested the program. But it also noted that Town Crier programs were being developed for the Eastern, Southern, central and Western groups of states. This intimates that the Town Criers content varied regionally with the activities of local 4-H groups. This mixed kids programs existed side-by-side with the state level programs and were aired on a mix of college and commercial stations. This was a lot of content. The papers of the Federal Extension Service described the programs thusly:
The program was targeted at kids. It explained how best to conduct their 4-H club activities, whether they be in the growing of crops, the raising of livestock, the preparation and serving of food, the selection and construction of clothing, or the general beautification of the farm home. One reference said they performed "music memory contests." These focused on "our best-known composers." I can only imagine these as s precursor to the quiz shows that would predominate radio a decade later."By means of the radio, club boys and girls were also given interesting glimpses into the world of literature and of birds and wild flowers, as well as of those other things that enlarge the horizon and give greater meaning to the everyday tasks of field and home."
"Mutual shows were produced by the stations on a cooperative basis, and the stations paid the productions costs and furnished the facilities, not the network. This setup was radically different from that used by the Major Networks, so in that sense, one could call Mutual small."MBS kept trying to make itself into a bigger player. One of the biggest mistakes it made was in 1960 selling out to 3M. The adhesive company was a poor fit. 3M didn't damage the company but it left it directionless, and sold it to a group of mixed investors in 1966. Two of the shareholders, Mr. and Mrs. Benjamin F. Gilbert bought out the other share holders then sold MBS to Amway and turned a profit in the process.
The FM stereo signal consists three parts, thus qualifying as "multiple." The first part is the sum of the left and right channels. This is simplified as L+R. This is a mono signal. If you have an old component amplifier from the 1970s it may have a mono switch and what it does is to only rectify this part of the signal. More here.Multiplexing - The simultaneous transmission of multiple signals on the same channel