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  1. Instructables
    https://www.instructables.com/AM-Transmitter...

    AM Transmitter / Modulator for Long Wave (LW) - Instructables

  2. Images of Long wave Transmitter Schematics

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  3. giangrandi.org
    https://www.giangrandi.org/electronics/l…

    An up-converter for receiving long and very long …

    This value allows converting all the very long and long waves where many available receivers are poor performers, but cuts medium waves, short waves and higher frequencies, where very strong signals from local transmitters …

  4. Hackaday
    https://hackaday.com/2021/10/19/the-low-down-on...

    The Low-Down On Long-Wave: Unlicensed Experimental Radio

  6. DXing.com
    https://www.dxing.com/lw.htm

    Longwave DXing Long Wave

    These signals can travel for thousands of miles via ground wave, but high transmitter powers are required. Signals at very low frequencies, about 50 kHz and lower, can penetrate sea water very well.

  7. giangrandi.org
    https://www.giangrandi.org/electronics/lw-swr/lw-swr.shtml

    A long-wave SWR meter - giangrandi

  8. giangrandi.org
    https://www.giangrandi.org/electronics/l…

    Long-waves transmitter: final unit - giangrandi

    Long-waves transmitter: final unit. The final unit is the power amplifier of the whole transmitter.

  9. People also ask
    How do you test a long-wave transmitter?
    The test is very simple: just connect your long-waves transmitter to a suitable 50 Ω dummy load via the SWR-meter under test and look at the reflected power: if you gat a non-zero reading, your meter is not suitable for long waves.

    A long-wave SWR meter - giangrandi

    giangrandi.org
    What is longwave radio?
    "Longwave" refers to all frequencies below the lower end of the AM broadcasting band at 540 kHz. The lower limit of what frequencies constitute "radio" is not precisely defined, but 5 kHz is a widely accepted starting point for the radio spectrum.

    Longwave DXing Long Wave

    dxing.com
    What kHz is a longwave station?
    A few longwave stations in Asiatic Russia can be heard on the Pacific Coast beginning an hour or so before local sunrise. 160 to 190 kHz: In the United States, this range is open to unlicensed experimental transmissions.

    Longwave DXing Long Wave

    dxing.com
    What is the reception distance on a longwave signal?
    Reception distance on longwave is similar to that on the AM broadcast band, as are reception patterns. Greater range is possible when the signal is reaching you over a water path, as is often the case in coastal regions. At night, reception of stations from hundreds or even thousands of miles away is possible.

    Longwave DXing Long Wave

    dxing.com
    What is listening to Longwave?
    Listening to Longwave is your introduction to the fascinating "basement band" of the radio spectrum. Key features of this book include: Who is on the air — when and where to listen. Receivers, converters and antennas for effective longwave reception.

    Longwave DXing Long Wave

    dxing.com
    How does an AM transmitter work?
    The stepped up signal from the secondary coil of the transformer modulates the power to the oscillator chip (+ power at pin 14 and - power at pin 7). A wire connected to the oscillator output (pin 8) serves as the antenna for broadcasting the amplitude-modulated radio wave. Figure 2. Simple AM transmitter circuit diagram.

    Make Your Own Low-Power AM Radio Transmitter | Science Project

    sciencebuddies.org
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  10. Science Buddies
    https://www.sciencebuddies.org/scien…

    Make Your Own Low-Power AM Radio Transmitter

    In this project, you will make a simple low-power broadcast circuit, using a crystal oscillator integrated circuit and an audio transformer. You can connect the circuit to the headphone jack of a portable music player (e.g. mp3, CD or …

  11. AmateurRadio.com
    https://www.amateurradio.com/low-powe…

    Low power longwave transmitter experiment

    Mar 31, 2015 · Here are the first results with images of the circuit on a Veroboard and the oscilloscope picture of the modulation with my Tandberg TP41 70’s radio on top of it listening to Dire Straits from Spotify streaming over longwave.

  12. Making Easy Circuits
    https://makingcircuits.com/blog/make-th…

    Make this 5 km Long Range Transmitter Circuit – Full …

    May 6, 2018 · The proposed circuit is a straightforward to construct 5 km range FM Transmitter. It includes 3 blocks; modulator / oscillator, 2 stage 500mW VHF amplifier and LED based power meter. The circuit enables transmiting music …

  13. Electrical Engineering Stack Exchange
    https://electronics.stackexchange.com/questions/58050

    amplitude modulation - long wave radio receiver circuit - Electrical ...