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
This week on ARRL Audio News: ARRL President Emeritus Jim Haynie, W5JBP, is a silent key The IARU General Assembly Adopts Revisions to the Region 2 Band Plan The National Geographic Channel’s new series “Mars” prominently features ham radio... Read more
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Raspberry Pi Powered HF Radio in an Ammo Can GoBox
InnovAntennas invest in Ansys
SAL 30 Mark II Receiving HF antenna by Array Solutions
Al Jazeera: Ham Radio and Scarborough Reef ( BS7H )
Noise Blankers and Noise Reduction -ARRL The Doctor is In
Airspy HF+ (Coming soon)
RIVERSIDE: City revisits ham radio tower decision
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Radio Amateur on St. Lucia Relays Reports of Hurricane Devastation on Dominica
Make a mains filter for EMC & noise reduction
GroundBreaker – Isolate your audio to remove RFI and ground loop problems!
ARRL Puerto Rico Section and Red Cross Renew Memorandum of Understanding
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