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Search for AM transmitters on Ebay Search for FM transmitters and FM Transmitter Module boards on Ebay

One Watt AM transmitters available for sale

Here is a collection of handcrafted AM band (medium wave) radio transmitters built by a hobbyist in Turkey.
     The builder tells us that the audio input (modulator input) is able to accept a wide range of impedance and V P-to-P levels. including old school cassette players, MP3 players, the output from a PC sound card or mobile phone (you might need a ferrite cable clamp to reduce noise) or CD player. 
     Apparently you can connect a microphone pre-amplifier (the unit needs a bit more voltage than straight mic output) to transmit  voice. 
     A 10W 60V RF power transistor is used at the output section to withstand high VSWR levels due to random type mismatched antennas.
     The transmitters all operate on 12 Volts DC of varying ampere levels, depending on the output power of the specific unit. 
     And what power levels there are! These are definitely not Part 15 compliant so please keep that in mind.
     
Features:
  • Covers most of the AM broadcast band
  • Tunable on any desired frequency within it's coverage
  • 2SC2014 power transistor as PA stage
  • BD139 AF power transistor as modulator stage
  • 2X 2N2222 transistors as oscillator
  • 2N3904 transistor as high gain audio amplifier stage
On sale now    
     The vendor tells us "I am an experienced radio receiver and transmitter builder, constructing radios and transmitters for more than 40 years, so you can buy confidently." so, why wouldn't you? One of the fastest ways to get a sweet signal on the air!

Broadcasting on longwave, also known as the 1750 meter band,160 KHz - 190 KHz

Imagine a radio band free for the taking! Low power radio experimenters have several underutilized opportunities to engage in recreational broadcasting. While not nearly as attractive as broadcast bands in AM and FM, these alternate spectrum opportunities still might be of interest to some.
     We've discussed the shortwave band in several posts, view our shortwave articles here
     Today we'll look in the opposite direction to something called longwave, or LW.
     Sadly, most European Longwave operations are shutting down, for the same reasons most of our USA AM band stations are going dark. The good news is, more spectrum for us to play with!
     According to Karl Thurber Jr., W8FX / 4, in his seminal Poptronics article on longwave experimentation:
     "For years, a small but enthusiastic group of experimenters have been communicating on an almost totally unknown, license-free amateur radio band. This is the so-called 1750-meter band, whose wavelengths range from 1874 to 1578 meters (160 to 190 kHz).
     It really isn't a ham band at all. Rather, this 30-kHz chunk of the longwave spectrum was allocated by the FCC in 1950 for limited-radiation device use. No operator or station license is required.
     The FCC rules governing this type of operation are found in CFR 47, Part 15 and set forth three main requirements."   
  • First. the power input to the final amplifier must not exceed one watt. 
  • Second, all emissions below 160 kHz or above 190 kHz (in other words, out of the 1750-meter band) must be suppressed by at least 20 dB. 
  • Third, the length of' the antenna and transmission line combined cannot exceed 50 feet.
     There's a nice historical overview of building transmitters for this band over at the Low Power Radio Repository in a section called  Longwave Broadcasting.
     The surviving hobbyist sites for what are called lowfers can be found on the Long Wave & Part 15 Home Page and Lowfer.us.
     Good old Techlib.com also offers an interesting beacon transmitter in a mints tin, the Altoids Tin LowFER Transmitter.
     Ebay recently started offering two new long wave modulators that might be combined with the above noted oscillators for an easy, modular approach to getting a long wave audio operation on the air:

MW-LW 150-1800kHz Modulator kit with cable & connectors

DDS AM LW/MW/SW TRANSMITTER MODULATOR 0-45MHz
     Fortunately, a hard-working hobbyist developed a proposed lowfer transmitter for audio transmission using a transmitter called the Deep Voice and a modulator from a project called the Big Talker.   
     So, you might ask, how could these broadcasts be received? Fair question! Several longwave receivers are available on Amazon.com and a selection can be viewed here: Longwave Radio Receivers
     Ebay also often offers these radios, please viit this search page for Ebay listings for Longwave Radio Receivers.
     Both Longwave and Shortwave are still tremendous opportunities for low power, experimental and recreational broadcasting. With easily constructed transmitters and widely available receivers, the only thing missing is YOU! 

Free program content for your broadcasts - download PSAs galore!

Over the years your faithful blog editor has collected a variety of public service announcements, PSAs, to fill in some program time on low power radio broadcasts.
     With over 200 of these 15 to 60 second PSAs on hand, in MP3 format, it seemed like a good idea to share what's been collected over the years.
     The topics range from civil defense to flood safety to financial planning and have been collected over many years.
download public service announcements     Rather than sort by topic, which would result in a pretty extensive listing, I took the broadcaster route and sorted by length of time.
     Please to be enjoying our MP3 PSA Library, which are the copyrighted property of their respective owners, listed below:
Library of 15 second PSAs (~28 MB)

Library of 30 second PSAs (~70 MB)

Library of 60 second PSAs (~60 MB)

(Please use the download link in the upper right hand corner of the file view page)
Public service announcements can round out pre-recorded programming, are easy to add to any playlist and help fill out a broadcast segment.

The other low power radio finds its voice

As Low-Power Local Radio Rises, Tiny Voices Become a Collective Shout
By Kirk Johnson, the New York Times
     Low-power nonprofit FM stations are the still, small voices of media. They whisper out from basements and attics, and from miniscule studios and on-the-fly live broadcasts. They have traditionally been rural and often run by churches; many date to the early 2000s, when the first surge of federal licenses were issued...
     Low-power FM stations can typically be heard for about three and a half miles if a bigger station or obstacle does not block the signal. ...nearly 2,500 low-power stations in some stage of licensing, construction or active broadcast across the nation...
     You want weird? Just turn the dial. One station in Seattle invites listeners to phone their dreams and fantasies into a recorded line, then puts them on the air, at least the ones that don’t raise concerns about F.C.C. indecency rules...
What low-power urban radio creates, believers say, is a sense of community, a defined physical stamp of existence that goes only as far as it can be heard. So new licensees and programmers are knocking on doors near their antennas and holding fund-raisers at the local brewpub. 
     That’s a stark contrast to the amorphous everywhere-but-nowhere world of the web, and the web-streaming radio or podcasts that a few years ago seemed most likely to take center stage in low-budget community communications. 
     Local media - radio, newspapers and even television, are strongest when closely connected to the community served.