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Amplitude Modulation on HF

Contemporary and vintage material about Amplitude Modulation on High Frequency ham radio



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Amplitude Modulation on HF
by VJB
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On the air with Howard Mills, W3HM.  Reminiscence about Howard's outstanding work repairing and restoring vintage radios. The conversation went from audio reception with a video portrayal, to some retro video taken at the Gaithersburg (Maryland) hamfest in 1995.
Topics: W3HM, 75A4, Collins 300G, GPT750, BC610, Collins 20V3, AR88
Amplitude Modulation on HF
by VJB
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A gathering of licensed radio hobbyists on the 75 meter shortwave band that followed the Federal Communications Commission's 2006 Report and Order in WT Docket 04-140.  This proceeding helped create pleasant listening conditions such as those in this audio recording. The venue was described as "Peaceful Valley" by Brent, W1IA, respecting the comfortable elbow room among stations compared with the congested but more familiar AM corridor up the band. Receiver was a 1966 R390A, diode...
Topics: "Tranquil Valley", R390A, AM on HF, K3ZRF, W3DUQ, W3GL, WB3HUZ, N2INR, diode output, W1IA
Amplitude Modulation on HF
by VJB
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W2INR "Level TWO" of his AM revival project.
Topics: W2INR, Johnson Valiant, R390, 3733, licensed radio hobbyists
Amplitude Modulation on HF
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The Old Friends Net meets at 4pm Eastern on 3715Kc Sundays, and at 9am Eastern on Tuesdays & Thursdays.  This recording was made New Year's Day, 2023, near the end of a gathering on Sunday, monitored in Maryland on the Kiwi SDR platform of internet receiver nodes.
Topics: "Old Friends Net, " W4MEC, W4Kr, KZ4B, WF2U, K3OS, AM on HF, 3715Kc
Amplitude Modulation on HF
by VJB
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Paul, K2ORC, demonstrates the Icom 718 at 40 watts on AM. Receiver is a WebSDR internet-based node.
Topic: K2ORC
Digital Library of Amateur Radio & Communications
by Dan Brown W1DAN
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A tribute to George Mouridian W1GAC, SK, written by Dan Brown W1DAN. An 50-minute audio interview with Mr. Mouridian is here . Source:  http://amfone.net/LateNotables/w1gac.htm Shared here with permission from Mr. Brown
Topics: George Mouridian, W1GAC, Dan Brown, W1DAN, amateur radio, ham radio, silent key
Amplitude Modulation on HF
by VJB
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One Ranger talks to another as N3DRX and W3DF have a QSO on 80 meters AM. The stations were received via internet SDRs, located in Washington DC and Westminster, MD.
Topics: N3DRX, W3DF, 3705 AM, Johnson Ranger
Amplitude Modulation on HF
by VJB
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Janis, AB2RA conducts some experiments with the audio of a Yaesu FTDX101D. Monitored in Maryland on the Kiwi SDR platform. User interface shows adjustments during the tests.
Topics: AB2RA, KiwiSDR, FTDX101D, Yaesu, 40m AM, 7283Kc, KB2BRM
Amplitude Modulation on HF
by really Ralph W3GL
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Another episode of the whimsical "What's For Dinner Net."
Topics: WA3JYU, WA3KLR, W3JN
Amplitude Modulation on HF
by Paul Courson
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Promotional video for W1AW-AM, which used a vintage broadcast transmitter in a national event called the AM Rally. This video helped recognize that the ARRL* had now made a permanent place in its station for the activity and mode of Amplitude Modulation. *American Radio Relay League, a national club for federally licensed radio hobbyists
Topics: W1AW, AM, Newington, ARRL, AM Rally, promotional video, WB1GCM, Gates BC-1T. broadcast transmitter,...
Amplitude Modulation on HF
by VJB
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AMers on 40 meters one pleasant Sunday afternoon
Topics: WL7B Bruce, 7290, AM on HF, IC7300
Amplitude Modulation on HF
by VJB
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Demonstration of the Flex 6400 on AM with Jon, AC1EV, 20 miles north of Boston, monitored in Maryland on the Kiwi SDR platform.
Topics: AC1EV, 3705AM, Flex 6400, synchronous detection AM, internet receiver, shortwave AM, audio...
Digital Library of Amateur Radio & Communications
by Paul Courson WA3VJB
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"WFOY-AM, St Augustine, Florida, bills itself as “the oldest radio station in the nation’s oldest city.” Its call sign relates to the station’s being built at the Fountain of Youth National Archaeological Park, where artifacts traced to Spanish explorer Ponce de Leon helped date the discovery of the New World. A group of Amateur Radio operators discovered that the station would soon discontinue operations at this location, 490 years after the explorer made land- fall there, and...
Topics: amateur radio, ham radio, John R. Fraser, WD4KQX, Walter Fraser, WFOY, AM radio, St. Augustine,...
Amplitude Modulation on HF
by WA3VJB
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One man's trash is another man's treasure. Gary, WD4NKA of Deltona Florida describes how he has been able to acquire at little to no cost some classic AM equipment he has then used on the air to communicate with other licensed radio hobbyists.  In this case, after hearing a story of a newspaper classified advertisement with a typographical error, he said he found a discarded stockpile of gear worth thousands of dollars. His telling of the story was monitored and recorded on the Kiwi SDR...
Topics: WD4NKA, National NC303, Hallicrafters HT-4, Johnson Courier, 7290 Kc, 40 meters AM, Kiwi SDR
Amplitude Modulation on HF
by VJB
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A gathering of AMers "down low" in the 75 meter phone band enjoying a roundtable discussion of audio techniques and other matters. Quite a span of technology represented in this conversation, ranging from a 1949 Collins transmitter, to a "software defined radio" (SDR) known as the Anan 100, a Flex 1000 that is one of the first SDR transceivers produced; a late model Anan, and a present-day, current production Class D AM transmitter built and marketed by K7DYY.
Topics: W3DBB, AB3AL, K2XAM, W2GOR, WB2CAU, 3705, AM on HF, K7DYY, Super Senior, 32V1, Anan 100
Amplitude Modulation on HF
by N3DRB
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Noted AMer Don Chester, K4KYV, hosts a visit from Tim West, N3DRB, who made this video of Don, his station, and some conversation about his time in the hobby. Don is widely heard through out North America on his 1/4 wave vertical on 160 and high dipole @ 90 ft for 75 meters. His studio is a former one-room schoolhouse that was relocated from a prospective highway project to Don's property at Woodlawn, Tennessee.
Topics: K4KYV, N3DRB, Don Chester, AM, 75A4, homebrew transmitter, T368 exciter
Amplitude Modulation on HF
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WA1STH & KG2IR
Topics: WA1STH, KG2IR
Amplitude Modulation on HF
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Winter radio conditions on 75 meters AM are distinguished by a lack of static and stable propagation. Here, strong AM signals without fade, and representing a wide geographic area, provide good listening at daybreak.
Topics: K4GHT, KK4GZQ, KW4WK, W2SDR, WZ5Q, WA3VJB, 3885, vintage plate modulation, R390A, Harvey-Wells,...
Amplitude Modulation on HF
by WA3JYU
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The longrunning "What's For Dinner Net" (WFDN) is a gathering of AMers on 3733Kc in the late afternoons. Ostensibly the net was created as a parody of the self-important traffic handling nets, most of which invariably have no traffic to pass. Their group then devolves into casual conversation like any other roundtable. One presumes that by declaring themselves a "net," they feel more entitled to a given frequency. Here, 3733 was selected in honor of Rolling Rock beer, and...
Topics: K3ZRF, W2VW, W3GL, W2JTD, 3733, What's For Dinner Net, AM, 75m, WFDN
Amplitude Modulation on HF
by Paul Courson
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Gaithersburg (Maryland) hamfest, 1995
Topics: Gaithersburg Hamfest, FARfest, AM Festival Station, AM Corral
Amplitude Modulation on HF
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Stan, VA3XRB, 60 miles East of Toronto, conducts some early tests on Amplitude Modulation using a newly-acquired Audio Technica studio microphone. We recorded his adjustments to illustrate how he sounds. Received on an internet KiwiSDR node located in Vermont. His stated carrier power was 25 watts.
Topic: VA3XRB
Amplitude Modulation on HF
by W3GL
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Another episode of the "What's for Dinner Net," featuring WA3JYU, WD8BIL and W3JN
Topics: 3733, "What's For Dinner Net, " WFDN, AMers, Collins 30K, Drake T4X, "75 Meters...
Amplitude Modulation on HF
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Back deck cookout, What’s For Dinner Net, 3733Kc
Topic: WD8BIL, AM on HF, KD3CN, 3733Kc, What's For Dinner Net
Amplitude Modulation on HF
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Canadian radio hobbyists on AM power up on 3733Kc for an evening of pleasant conversation on shortwave.  The QSO was initiated by Donovan, VE1BDC , who sent out a "smoke signal" to others inviting them to join the party!
Topics: VE1BDC, VE1PYE, VE1ZAC, VE2KGK, VE9RC, KB1VWC, 3733Kc, AM on HF, Sanbox Net, Cololins 32V2, FRT501,...
Amplitude Modulation on HF
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WA3VJB, W3JN and WA3JYU discuss cars in a roundtable on 3733Kc
Topics: 3733 Kc, W3JN, WA3JYU, Amplitude Modulation, Kiwi SDR internet receiver
Amplitude Modulation on HF
by VJB
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Morning short-haul 40 meters AM.  Paul K2ORC as received in central Maryland, running 40 whatts from an Icom IC-718. We are visited by Gordon, W2GOR in New York for a few minutes. He runs an Anan SDR transceiver with external audio processing software.
Topics: K2ORC, W2GOR
Amplitude Modulation on HF
by VJB
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Buzz ("Jim") and Gordon conduct audio experiments with a series of adjustments. Reception passband 12Kc, some automatic volume control included by the KiwiSDR node.  Near the end of the recording, reception moved to a WebSDR node and manual gain control.
Topics: W3EMD, W2GOR, Collins KW-1, Anan SDR transceiver
Amplitude Modulation on HF
by VJB
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Kevin, K2XAM, discusses the fascination with "antique radios" as a kid, and how he used trips to the library to expand his technical knowledge.
Topic: K2XAM
Amplitude Modulation on HF
by WA3VJB
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AM equipment typically consists of "big iron," like plate transformers and modulation transformers.  There has even been a "Heavy Metal Rally" that invites participation among stations involving gear that weighs at least 250 pounds, with power of at least 250 watts AM. Here, longtime AMer the TimTron, WA1HLR , describes going to Canada from his home in Maine to collect a mod transformer from a 10 kilowatt transmitter being discarded by Radio Canada at the station's...
Topics: WA1HLR, Big Iron, Modulation Transformer, Pinto Valdez
Amplitude Modulation on HF
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"What's For Dinner Net," a whimsical gathering of licensed radio hobbyists on a shortwave frequency.
Topics: 3733, WFDN, "What's For Dinner Net, " WB3LGG, W3JN, WD8BIL, Collins 30K, Johnson Valiant,...
Amplitude Modulation on HF
by WA3VJB
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Don Chester, K4KYV, an AM historian and longtime participant, describes some contemporary issues facing the hobby.
Topic: K4KYV
Amplitude Modulation on HF
by WA3VJB
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AMer W2INR reveals how he overbuilt a Collins 21E broadcast transmitter when re-configuring it as a mononbander for 75 meters. The enormous, three-cabinet transmitter took up an entire wall at his home.
Topics: Collins 21-E, W2INR, AM on 75 meters, 3885
Amplitude Modulation on HF
by VJB
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KF4IZE and K2ORC at the top of 40 meters Thursday evening around 4:40EST
Topics: K2ORC, IC-718, AM, 7295Kc
Amplitude Modulation on HF
by K3L
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Thomas Point Lighthouse in the Chesapeake Bay was activated in 2001 by licensed radio hobbyists for an on the air operating event called National Lighthouse Weekend. Using the special event call K3L, the station operated exclusively on AM respecting the vintage nature of the site. This photo QSL was issued to stations worked. Soon, the events of 9/11 created intense security overlays that prevented a subsequent return for a couple of years. For a while it looked as if this would be the first...
Topics: K3L, AM Expedition, Chesapeake Bay, National Lighthouse Weekend, ILLW, International Lighthouse and...
Amplitude Modulation on HF
by VJB
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The "Watts For Dinner Net" episode for December 23.
Topics: WB3LGG, KD3CN, W2JTD, WA3JYU, WA3KLR, WFDN, 3733, "What's For Dinner Net, " AM on HF
Amplitude Modulation on HF
by VJB Radio
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Bill checks the audio lash-up on a Johnson Valiant.  Reeception was via an internet-based receiver located near West Friendship, Maryland, about halfway between Frederick and Baltimore.
Topics: K8DBN, WX3K
Amplitude Modulation on HF
by VJB
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W3RJP, Bob near Lancaster, Penna.
Topics: W3RJP, AM on HF, 3733, 9105A, Optimod HF
Amplitude Modulation on HF
by WA3VJB
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AMers from around the country gather at the annual Dayton (Ohio) Hamvention.  This video includes rare aerial shots taken from a perch on top of Hara Arena, showing the size and scale of the electronic fleamarket below. The footage is now historic since the location has been razed and the hamfest relocated elsewhere.
Topics: AMers at Dayton, WB3HUZ, W3JN, Hara Arena, WA2PJP, W2XR
Digital Library of Amateur Radio & Communications
by Paul Courson WA3VJB
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Audio interview with John R. Fraser WD4KQX, son of Walter Fraser, the founder of WFOY AM in St. Augustine, Florida. Interview by Paul Courson WA3VJB. Quotes from this interview were used in Paul's article in QST Magazine:  Hams Redeem Old Transmitter at Fountain of Youth
Topics: amateur radio, ham radio, John R. Fraser, WD4KQX, Walter Fraser, WFOY, AM radio, St. Augustine,...
Amplitude Modulation on HF
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A short video demonstrating the initiating of a contact on shortwave AM, and generating responses among licensed radio hobbyists. Conditions were very good on 40 meters this particular day. This production includes the use of an internet-based, streaming audio receiver system to monitor air signal, via a node located in Maryland.  A portrayal of signals is part of the user interface on the KiwiSDR platform.
Topics: K1GMM, AJ4OO, KiwiSDR, WA3VJB, AM on HF, 40 meters, 40m AM, shortwave, licensed radio hobbyists,...
Amplitude Modulation on HF
by VJB
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W2VGD, Bob, tries out his Drake T4XC on 40 meters AM.
Topics: W2VGD, Drake, 40 meters AM, 7280, 7290
Digital Library of Amateur Radio & Communications
by Dan Brown W1DAN
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An interview with George Mouridian W1GAC by Dan Brown W1DAN Also read Dan's tribute to George here .
Topics: amateur radio, ham radio, silent key, George Mouridian, W1GAC, Dan Brown, W1DAN
Amplitude Modulation on HF
by VJB
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Another episode of the "What's For Dinner Net," a whimsical gathering of AMers on 3733Kc.
Topics: W3JN, WA3JYU, WD8BIL
Amplitude Modulation on HF
by WB3HUZ
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A video from 2001 showcases efforts by licensed radio hobbyists to find, acquire, repair and restore retired, vintage, AM broadcast transmitters being discarded by radio stations across the country. This video was produced as part of a presention at "The AM Forum," at the 2001 Dayton Hamvention. The annual gathering drew AMers from across the country to meet & greet those we had talked with on the air, to share hamfest finds, and to discuss current regulatory and political affairs...
Topics: Dayton Hamvention, WB3HUZ, AM broadcast transmitters, vacuum tube transmitters, N2YR, KO6NM, N2INR,...