Many of us tried the old “Two tin cans connected by a string” experiment as kids. [Michael Rainey, AA1TJ] never quite forgot it. Back in 2009, he built “El Silbo”, a ham radio transmitter powered entirely by his voice. El Silbo is a Double Side Band (DSB) transmitter for 75 meters. While voice is used to excite the transmitter, it doesn’t actually transmit voice. El Silbo is a CW affair, so you should bone up on your Morse Code
a bit before building one. Like many QRP transmitters El Silbo’s circuit is rather simple. A junk box loudspeaker is installed at the bottom of the can to convert voice power to electrical power. The signal is passed through a step up transformer, and used to excite a 75m crystal. Two NPN transistors
(in this case MPS6521) pass the signal on through a second transformer. The signal is then routed through an LC network
to the antenna..…READ MORE -OR WATCH VIDEO
OSCAR-100 This spectrum monitor, hosted at Goonhilly Earth Station in Cornwall, shows the Qatar OSCAR-100 wideband transponder onboard the Es’hail-2 satellite. You can read more about the WebSDR & Spectrum Viewer station at wiki.b... Read more
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To strengthen the relationship between Thai and Japanese amateur radio operators representatives of the JAMSAT group of Japan have travelled to Thaila... Read more
YAESU SMB-201 With so many diverse ways to enjoy Amateur Radio such as WIRES-X and packet operation, transceivers are now having to deal with increase... Read more
The CQ World Wide DX Contest (SSB) kicked off the fall contest season this past weekend with plenty of activity from around the world. As The Daily DX... Read more
DXpedition Team 14 – 20 April 2015 asDX0P. DU1BP, DU2BOQ, DU7RJA, DV1JM, K6BF, K6BG, WA6LOS, WE6DX, WJ1P, WW6CP Team Leader: WA6LOS RIGS:... Read more
“Hello Operators Extreme weather and grid down disasters seem to be happening more often, and with greater intensity. More often than not, when... Read more
Kenwood TH-D74A 144/220/430 MHz TRIBANDER. Triband Amateur radio packed with convenient features and the advantage of a digital transceiver with D-STA... Read more
BURST 2000A HF power amplifier BURST-2000A 2200 W PEP output power (SSB and CW) All HF bands, including WARC bands and 6 meters Rated input pow... Read more
“Howdy Folks, I’m excited to bring you the next development version of FT8Call, version 0.5, and boy do I have some fun stuff included i... Read more
“Ferrite Beads can be magical in what they do at a ham radio station. One website that has lots of information and even tutorials is Palomar-Eng... Read more
“The fast solar wind we have been enjoying over the past week from an extended coronal hole is finally beginning to wane. We will likely remain... Read more
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