{"id":65739,"date":"2026-04-05T07:25:47","date_gmt":"2026-04-05T11:25:47","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=65739"},"modified":"2026-04-05T07:25:47","modified_gmt":"2026-04-05T11:25:47","slug":"bobs-radio-corner-where-it-began-the-am-medium-wave-broadcast-band","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2026\/04\/bobs-radio-corner-where-it-began-the-am-medium-wave-broadcast-band\/","title":{"rendered":"Bob’s Radio Corner: Where it Began – The AM Medium Wave Broadcast Band"},"content":{"rendered":"
\"\"<\/a>

Copilot Radio, Model Unknown
The dial certainly has some problems, but the rich, Bakelite, art deco cabinet is superb.<\/p><\/div>\n

By Bob Colegrove<\/strong><\/p>\n

One of the great attractions of the radio hobby is that it has so many different areas on which to specialize.\u00a0 As examples, one can focus on a particular band, collect or restore radios, DX or just listen.\u00a0 With so much to choose from, one can impulsively skip from one area to another.\u00a0 I have tuned the shortwave bands for many years, but I also like the AM medium wave band.\u00a0 If there is a purpose to this post, it is simply to bring some occasional attention to AM listening and DXing.\u00a0 There is nothing new in what follows.<\/p>\n

What\u2019s in a Name?<\/b><\/h2>\n

To start with, this subject is somewhat confusing by calling it what we do.\u00a0 There are at least three common terms for the electromagnetic spectrum between 530 kHz and 1700 kHz: 1) AM, 2) broadcast band, and 3) medium wave.\u00a0 This poses an identity dilemma; that is, none of these names are exclusive.\u00a0 AM<\/i> defines a form of modulation, amplitude modulation, which is used in other portions of the spectrum.\u00a0 The same may be said of broadcast band<\/i>.\u00a0 There are several international broadcast bands within the shortwave spectrum.\u00a0 That leaves us with medium wave<\/i>.\u00a0 But that term lacks precision.\u00a0 What exactly are the boundaries of medium wave?\u00a0 Shortwave bands have relatively precise names related to their wavelength, 80 meters, 31 meters, etc.\u00a0 Should we call medium wave the 176-thru-943-meter band, instead?\u00a0 Let\u2019s just stick with any of the old familiar terms.<\/p>\n

In the Beginning<\/b><\/h2>\n

I\u2019m sure many readers share the experience related here.\u00a0 Even before shortwave there was medium wave.\u00a0 Our initial encounter may have been with the monolithic, multi-band console radio in the parlor.\u00a0 However, the house was likely home to one or more less pretentious table radios, which were limited to the medium wave broadcast band.\u00a0 It all began with curiosity about what lurked in the relative space between the few local stations that played so clearly along the dial.\u00a0 We likely found less listenable stations poking through in the inter-station space.\u00a0 These were stations like our own in neighboring communities.\u00a0 Then, at night, a strange thing happened.\u00a0 Like stars in the sky, more stations appeared, some hundreds of miles away.\u00a0 At the same time, some of the stations we heard during the day disappeared, maybe even a local station or two.<\/p>\n

Well, one thing led to another, and soon we were keeping track of stations that we heard.\u00a0 We took note of where they were located and their position on the dial using a new term called kilocycles.\u00a0 The fastidious among us kept daily logs with dates, times, and reception conditions.\u00a0 So, our DXing career began.<\/p>\n

I came along a full generation after the advent of AM radio broadcasting.\u00a0 In my early years, it was still the mainstay of public information and entertainment.\u00a0 Television stations were beginning to pop up across the country one by one, and FM radio\u2019s popularity was still a decade away.\u00a0 Like any imposing distraction, there was curiosity in what was being heard and, in the case of radio, where it was coming from.<\/p>\n

Our house was home to perhaps three or four AM radios.\u00a0 At the age of seven, I was gifted of a 4-tube Sears Silvertone \u2013 mine to keep in my own room<\/a>.\u00a0 But the radio that really got me going came along several years later and belonged to my father.\u00a0 This was a General Electric Model P755A, five-transistor portable<\/a>.\u00a0 Shaped somewhat like a lunchbox, including the handle, it was the quintessential portable radio that the world had been waiting for.\u00a0 It ran for many hours off a single, but pricey 9-volt carbon-zinc battery.\u00a0 There was purposely no provision to run it from AC power.\u00a0 Also, it used an internal ferrite core antenna.\u00a0 There was no jack or terminal for an external antenna.\u00a0 Besides the tuning knob and volume control, it had a jack for a single earplug.\u00a0 It was truly portable in all respects.\u00a0 For all its simplicity, it did its job very well, and I borrowed it whenever the occasion presented itself.<\/p>\n

\"\"<\/a>

Left: Silvertone Model 132.818-1, Sears, Roebuck & Co (1949, $11.95)
Right: General Electric Model P755A Transistor Portable (1957, $19.95)<\/p><\/div>\n

As an only child, I was the sole recipient of any goodies that came along, and it wasn\u2019t too long before I had my own comparable Westinghouse portable.\u00a0 But the GE was really the one that got things started.<\/p>\n

A Plethora of Stations<\/b><\/h2>\n

I have recently wondered whether shortwave use has contracted about as far as it can go.\u00a0 This is not the case with AM, at least not yet.\u00a0 The graph below shows the total number of AM radio stations in the US throughout history, 100 years.\u00a0 The total has remained relatively stable since 1960, albeit with a slight downward trend from the peak around 1990.\u00a0 Stations occasionally come and go.\u00a0 Some rebrand with a different format or fresh call letters.\u00a0 Note that the steepest rate of decline, 217 stations, occurred over the past five years, amounting to 4.7%.\u00a0 Whether this rate of attrition will continue is a matter of speculation.<\/p>\n

\"\"<\/a>

Graph compiled from <\/i>https:\/\/en.wikipedia.org\/wiki\/Radio_in_the_United_States<\/i><\/a>\u00a0<\/i><\/p><\/div>\n

Medium wave DXing is a lot different than shortwave.\u00a0 The density of stations will vary depending on what part of the world you live in.\u00a0 Here on the East Coast of North America, the AM band is saturated with signals.\u00a0 That is, with a suitable antenna, one can at least detect a station on each of the 118 available channels – certainly at night and possibly even during the day.\u00a0 On the other hand, some years ago, I had an opportunity to visit Honolulu, Hawaii.\u00a0 With little time to listen, I only heard a few of the islands\u2019 stations but imagined what possibilities nighttime Dxing held.<\/p>\n

Despite the density of stations on the East Coast, there will still be limits on the number of stations logged.\u00a0 My experience is that initially the log grows quickly, then tapers off steadily as you go along.\u00a0 Your time is eventually spent locked in on a local or regional frequency, waiting for something you\u2019ve heard to fade out and something you haven\u2019t heard to fade in.\u00a0 In a previous posting, I worked the lower end of the band rigorously for some time, coming up with a fair number of catches<\/a>.<\/p>\n

Ten-kHz channel separation is the convention in Region 2, the Americas.\u00a0 There have been some occasional anomalies.\u00a0 Several years ago, there was a handful of so-called \u201csplit-channel\u201d nonconformists, who placed their carriers midway between channels and presented an opportunity to log some hard-to-hear countries.\u00a0 It was also possible to pull in a few very high-power European and North African stations.\u00a0 This took advantage of the 9 kHz vs. 10 kHz channel spacings between Region 1 (east) and Region 2 (west).<\/p>\n

Seasonal changes are also important.\u00a0 Winter is the best.\u00a0 Propagation is generally better and more consistent.\u00a0 Atmospheric noise is minimal.\u00a0 Local stations limited to daylight operation have shorter hours.\u00a0 The gray hours around sunup and sundown can produce unusual DX conditions.<\/p>\n

Programming<\/b><\/h2>\n

Programming has changed since the 1950s.\u00a0 As the go-to medium for public information and entertainment, content was original and competitive.\u00a0 Mornings were often filled with local DJs playing occasional songs and generally keeping listeners apprised of news and weather.\u00a0 Traffic helicopters were still in the future.\u00a0 The genre of soap operas was born and consisted of 15-minute, serialized dramas one after the other during the middle of the day.\u00a0 Faithful audiences followed these melodramas for many years.\u00a0 DJs took over the airwaves again in mid-afternoon and continued through dinner time.\u00a0 Prime time lasted throughout the evening hours with regular drama, comedy and variety shows which were networked throughout the country.<\/p>\n

Newspapers published daily tabular program schedules for all the local stations.\u00a0 My dear mother would carefully trim these out of the paper and clip them together for a complete week\u2019s program listing.\u00a0 You can see below some of WFBM\u2019s soap operas started as early as 9:00 am.\u00a0 Don McNiell\u2019s Breakfast Club (WISH, 8:00 am) \u201ccoming to you from high atop the Hotel Allerton in downtown Chicago\u201d was a great syndicated live variety show.<\/p>\n

\"\"<\/a>The advent of television and FM did not mean the end of AM radio.\u00a0 Instead, it went on to a second golden age due largely to rock\u2019n roll and other popular music.\u00a0 The likes of Wolfman Jack and Cousin Brucie garnered the loyalty of a younger generation through the \u201860s, \u201870s, and \u201880s.\u00a0 Today, much of the content is \u201ccanned\u201d for economy.\u00a0 You can classify the fare into news, talk, sports, religion, and ethnic categories with very little music or other variations throughout the day.\u00a0 AM radio has learned to adapt and survive.<\/p>\n

Antennas<\/b><\/h2>\n

All the credible rules one has ever learned about antennas still apply when listening to medium wave.\u00a0 However, one type in particular stands out as being especially useful.\u00a0 Loop antennas.\u00a0 Simply put, loop antennas are effective for their directional properties.\u00a0 There are 118 channels in the Americas used by perhaps 10 to 12 thousand stations.\u00a0 The channels must be shared.\u00a0 All of this is regulated to some extent, but there remains a good amount of overlap and interference.\u00a0 That is where the null response characteristic of a properly designed loop antenna comes into play.\u00a0 By pointing the loop normal to the direction of the interfering station, it is quite possible to hear a station of lower power or further away.<\/p>\n

I have had great success over the years using loop antennas I fabricated myself.\u00a0 This is not in everyone\u2019s interest or capability.\u00a0 Some folks will favor active (amplified) loop antennas, of which there are several.\u00a0 However, very adequate passive loop antennas are available at reasonable cost, require no power, and may be inductively coupled to a portable radio, so they require no direct wiring. These include the Tecsun AN-100, AN-200, and the Terk Advantage AM Indoor Antenna. The AN-100 and AN-200 may be branded under other names.\u00a0 Bringing a coil-capacitor circuit into resonance and hearing the radio come alive is curiously addictive.<\/p>\n

\"\"<\/a>

Tecsun AN-100 (left) and Terk Advantage (right)<\/p><\/div>\n

Station Listings<\/b><\/h2>\n

Just as with shortwave, it is very useful to have some resources to help identify stations.\u00a0 The year was 1958 BC (before computers).\u00a0 There were no online portals for station information.\u00a0 Printed information, what there was of it, was generally spotty and dated.\u00a0 There was one man, however, whose passion for radio and TV of the time led him to manually and painstakingly develop a database of radio and TV stations, their locations, and their frequency or channel.\u00a0 His name was Vane A. Jones.\u00a0 He was a real estate broker by trade, and his office was coincidentally right down the street from where I lived in Indianapolis.\u00a0 Although I never met him, his dedication to producing his station guide is a marvel of work that has amazed me over many years.\u00a0 His North American AM-FM Radio TV Station Listings<\/i> was self-published in 1958, and picked up by Howard Sams Publishers in 1963, where it continued to be revised periodically through 1981.\u00a0 See https:\/\/www.worldradiohistory.com\/Archive-All-Logs-Lists-Directories\/Jones_Master_Page.htm<\/a>.\u00a0 This is the book I started with and still have as a keepsake.<\/p>\n

\"\"<\/a><\/p>\n

Moving forward 68 years I now get my data from the Federal Communications Commission (FCC) by periodically downloading their AM database for all Region 2, the Americas (https:\/\/www.fcc.gov\/media\/radio\/am-query<\/a>).\u00a0 I import this into Excel, filter out the data I am not interested in and load it on a Kindle tablet for easy access while listening.\u00a0 In addition, the spreadsheet has been taught to calculate the distance between home and the station<\/a>.<\/p>\n

\"\"<\/a><\/p>\n

Internet<\/b><\/h2>\n

Before the internet we did not have very many resources for identifying stations.\u00a0 Today, most stations have a website and a link to stream their station.\u00a0 By comparing what you hear on the stream link with what you think you hear on the radio, you can often make a positive identification.\u00a0 There are a couple of caveats to this.\u00a0 The broadcast may be networked over several stations, in which case the radio may be receiving the same broadcast, but from a different station than that being streamed.\u00a0 The other issue is that the streamed broadcast may be delayed by several seconds, requiring you to stand by for some common interruption such as a local commercial.<\/p>\n

Besides the station\u2019s own streaming, you can try to pair up what you are hearing on the radio with dedicated streaming services such as TuneIn and Radio Garden.<\/p>\n

There is a myriad of other techniques you can apply using the Internet.\u00a0 I have found that stations which simulcast AM and FM channels tend to announce the FM frequency more often than that of their AM channel.\u00a0 As a result, you can deplete your radio batteries waiting for some telltale clue as to the station\u2019s identity.\u00a0 By activating your favored search engine and pairing the announced FM frequency with that of the tuned AM frequency, you can often find a link to the unidentified station.\u00a0 For example, an announcement for 92.9 MHz FM with the radio tuned to 670 kHz would produce a search for \u201c92.9 MHz 670 kHz\u201d and would lead you to links for WLUI in Lewistown, PA.\u00a0 The reasoning is there are not many stations sharing the same pair of AM and FM frequencies.<\/p>\n

National Radio Club<\/b><\/h2>\n

If the avid AM DXer were restricted to just one resource, I would venture to say it would be membership in the renowned National Radio Club (https:\/\/nationalradioclub.org\/<\/a>).\u00a0 It is the oldest and largest medium wave DX club, having been around since 1933.\u00a0 DX News<\/i> consists of 20 bulletins per year, bi-weekly in winter, monthly in summer, and contains over 750 pages a year of DX and radio information.\u00a0 The seminal publication, The AM Radio Log, <\/i>is the definitive source for AM station information.\u00a0 A 47th edition is scheduled for publication in the Summer of 2026.\u00a0 To bait your interest, the 2017 edition is available for downloading at https:\/\/www.worldradiohistory.com\/Archive-All-Logs-Lists-Directories\/Archive-Radio-Logbooks\/NRC_Logs\/NRC-Radio-Log-2017-38.pdf<\/a>.\u00a0 Another noteworthy NRC publication is the Antenna Pattern Book.\u00a0 <\/i>This contains transmission patterns for both day and night operation of US, Canadian, and selected foreign stations.<\/p>\n

I know I am missing other valuable resources for medium wave DXing.\u00a0 Perhaps you can help me out with comments.<\/p>\n

Digital AM<\/b><\/h2>\n

Well, we\u2019re back where we started \u2013 with words.\u00a0 Digital AM is a contradiction in terms.\u00a0 The foregoing discussion relates to the \u201cbroadcast band\u201d in its traditional sense.\u00a0 This is changing.\u00a0 Today\u2019s AM band has become a laboratory for technological experimentation.\u00a0 In-Band On-Channel (IBOC) radio, sometimes called \u201cHD Radio<\/a>,\u201d is digital technology.\u00a0 It allows AM and FM stations to transmit higher quality digital signals simultaneously with their analog signal.\u00a0 In the case of AM, the listed analog frequency is augmented by digital content on unused adjacent channels. For example, WCAO, 600 kHz in Baltimore, MD uses 590 kHz and 610 kHz for its digital HD content.\u00a0 The two neighboring channels are not used by other local stations.<\/p>\n

WSHE (formerly WWFD) in Frederick, MD, operates on 820 kHz.\u00a0 In 2018, it became the first AM station to abandon analog transmission for an all-digital, MA3 mode.\u00a0 Despite both stations being local to me, I have no idea who listens to the digital content, let alone, what kind of device they are using.\u00a0 Currently \u201cDigital AM\u201d is a facet of broadcasting that has not been widely promoted.<\/p>\n

Digitization of the medium waves is only one part of what has come to be called \u201cAM radio revitalization.\u201d\u00a0 This movement promoted by the FCC took shape several years ago.\u00a0 Much of it is regulatory.\u00a0 Key elements include the relaxation of community coverage standards, and the use of FM translator (repeater) stations.\u00a0 Elimination of the complex AM “ratchet rule,” is also involved.\u00a0 This rule has been criticized for discouraging AM station improvements resulting in a net loss of interference-free nighttime AM service.<\/p>\n

Revitalization may take us down a long, bumpy, and expensive road.\u00a0 Along the way medium wave radio must maintain social relevance and listeners must be induced to return to the band as a significant source of information or entertainment.\u00a0 One thing is certain, the portion of the electromagnetic spectrum between 530 kHz and 1700 kHz is not going away.\u00a0 It is more durable than the ground we walk on.\u00a0 It will continue in one form or another.\u00a0 Meanwhile, we can continue to enjoy it just the way it is.<\/p>\n

AM. Medium wave.\u00a0 Broadcast band.\u00a0 Whatever you call it, it\u2019s a fascinating part of radio.<\/p>\n

Good DXing.<\/p>\n","protected":false},"excerpt":{"rendered":"

By Bob Colegrove One of the great attractions of the radio hobby is that it has so many different areas on which to specialize.\u00a0 As examples, one can focus on a particular band, collect or restore radios, DX or just listen.\u00a0 With so much to choose from, one can impulsively skip from one area to […]<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[373,433,3,305],"tags":[625,7988,4099,4094,1302],"class_list":["post-65739","post","type-post","status-publish","format-standard","hentry","category-am","category-mediumwave","category-news","category-nostalgia","tag-am-radio","tag-bob-colegrove","tag-mediumwave","tag-nostalgia","tag-radio-nostalgia"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-h6j","jetpack-related-posts":[{"id":48403,"url":"https:\/\/swling.com\/blog\/2021\/04\/am-radio-history-80th-anniversary-of-the-havana-treaty\/","url_meta":{"origin":65739,"position":0},"title":"AM Radio History: 80th Anniversary of the \u201cHavana Treaty,\u201d","author":"Thomas","date":"April 4, 2021","format":false,"excerpt":"Many thanks to SWLing Post contributor, Bob Colegrove, who writes: Hi Thomas, I came across this article on Wikipedia. It is a few days late, but thought it might be of interest to others. The link is https:\/\/en.wikipedia.org\/wiki\/North_American_Regional_Broadcasting_Agreement. Briefly, this past Monday, was the 80th anniversary of the implementation of\u2026","rel":"","context":"In "News"","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/05\/philco38-4_dial_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/05\/philco38-4_dial_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/05\/philco38-4_dial_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":60935,"url":"https:\/\/swling.com\/blog\/2024\/10\/responding-to-the-colegrove-inspiration\/","url_meta":{"origin":65739,"position":1},"title":"Responding to “The Colegrove Inspiration”","author":"Jock Elliott","date":"October 24, 2024","format":false,"excerpt":"By Jock Elliott, KB2GOM It was Bob Colegrove\u2019s post -- this one\u00a0-- that inspired me and set me on this path. Medium wave broadcast band DXing (MWBCB) has a certain fascination for me, but I am poor at it. Oh sure, I have read the advice: map the band at\u2026","rel":"","context":"In "AM"","block_context":{"text":"AM","link":"https:\/\/swling.com\/blog\/category\/am\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/10\/Satellit-on-1690-001-001-1024x662.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/10\/Satellit-on-1690-001-001-1024x662.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/10\/Satellit-on-1690-001-001-1024x662.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":49864,"url":"https:\/\/swling.com\/blog\/2021\/08\/bob-colegrove-on-the-joys-and-challenges-of-tuning-analog-radios\/","url_meta":{"origin":65739,"position":2},"title":"Bob Colegrove on “The Joys and Challenges of Tuning Analog Radios”","author":"Thomas","date":"August 1, 2021","format":false,"excerpt":"Many thanks to SWLing Post contributor, Bob Colegrove, who recently shared this excellent article and has kindly allowed me to share it here in the the Post. Bob prefaced it by saying, \"Being a retired technical writer, I started the attached article some time ago for my own amusement, but\u2026","rel":"","context":"In "Books"","block_context":{"text":"Books","link":"https:\/\/swling.com\/blog\/category\/books\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/08\/Bob-Colegrove-Book-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/08\/Bob-Colegrove-Book-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/08\/Bob-Colegrove-Book-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/08\/Bob-Colegrove-Book-1.jpeg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":60925,"url":"https:\/\/swling.com\/blog\/2024\/10\/bob-asks-whats-your-favorite-corner-of-the-dial\/","url_meta":{"origin":65739,"position":3},"title":"Bob asks: “What\u2019s Your Favorite Corner of the Dial?”","author":"Thomas","date":"October 21, 2024","format":false,"excerpt":"Many thanks to\u00a0SWLing Post\u00a0contributor,\u00a0Bob Colegrove, who shares the following guest post: What\u2019s Your Favorite Corner of the Dial? As asked by Bob Colegrove Let\u2019s suppose you\u2019ve been listening to radio for a while.\u00a0 Consciously or not, you\u2019ve probably favored a range of AM, SW, or FM frequencies.\u00a0 These are areas\u2026","rel":"","context":"In "AM"","block_context":{"text":"AM","link":"https:\/\/swling.com\/blog\/category\/am\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/10\/Fig-5.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":61740,"url":"https:\/\/swling.com\/blog\/2025\/01\/the-curious-case-of-the-nibi-nibi-islands\/","url_meta":{"origin":65739,"position":4},"title":"Bob’s Radio Corner: The Curious Case of the Nibi-Nibi Islands","author":"Thomas","date":"January 18, 2025","format":false,"excerpt":"Many thanks to SWLing Post contributor Bob Colegrove, who writes: Hi Thomas, No mention of UTC or frequency in the attached. Made my day, but some folks apparently were not amused. Source was \"Short-Wave Report\" by Hank Bennett, Popular Electronics, Ziff-Davis Publishing Co., New York, p. 86, March 1959. Regards,\u2026","rel":"","context":"In "Funny"","block_context":{"text":"Funny","link":"https:\/\/swling.com\/blog\/category\/funny\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/01\/Globe-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/01\/Globe-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/01\/Globe-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/01\/Globe-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/01\/Globe-1.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":51812,"url":"https:\/\/swling.com\/blog\/2022\/02\/guest-post-control-of-electromagnetic-radiation-conelrad\/","url_meta":{"origin":65739,"position":5},"title":"Guest Post: Control of Electromagnetic Radiation (CONELRAD)","author":"Thomas","date":"February 8, 2022","format":false,"excerpt":"Many thanks to SWLing Post contributor,\u00a0Bob Colegrove, who shares the following guest post: Control of Electromagnetic Radiation (CONELRAD) As recalled by Bob Colegrove In his comment on my recent posting, Tinkering with History, Mario noted the dial on the featured radio, the General Electric P755A, sported two small triangles, one\u2026","rel":"","context":"In "AM"","block_context":{"text":"AM","link":"https:\/\/swling.com\/blog\/category\/am\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/02\/Fig-1-e1644317508418.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/02\/Fig-1-e1644317508418.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/02\/Fig-1-e1644317508418.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/02\/Fig-1-e1644317508418.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/02\/Fig-1-e1644317508418.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/65739","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/comments?post=65739"}],"version-history":[{"count":3,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/65739\/revisions"}],"predecessor-version":[{"id":65749,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/65739\/revisions\/65749"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=65739"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=65739"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=65739"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}