Conventional power supply with a normal mains transformer, constructed to feed a laptop that is used in radio applications. Normal computer power supplys are mostly switching power supplies, operating on approx. 50 Khz or so. They can create huge radio noise and disturbances when you use them near a (Shortwave) radio, because the squarewave creates spikes and harmonics over a broad frequency band. Construction: mains transformer, bridge rectifier, 2 trans Darlington with a zenerdiode from basis to earth, over the zenerdiode a capacitor from approx 220 uf + a capacitor of 100N. In the video I tell about the zener, perhaps this is not clear. what I mean is this: I took the voltage to feed the stabilizing circuit only 2 Volts higher as the zener voltage and used a resistor. This for the case that the zener eventually burns out. In that case the computer is not damaged by the higher voltage that can occur in that case. The car lamp is my short circuit protection. If you watch this video on another channel as You Tube, please check youtube for the original content and possible changes in the text.
In Propagation Seems Good Here Tonight, animated drawings correspond with shortwave radio transmissions recorded in Chelsea, New York between March 20 and 21, 2009. Imagery alters between illumination and dimness as if to sift through an atmosphere of random noise in the universe. This unpredictable environment, with its degrees of murk and clarity, propagates waves that bend, stretch, open, close, pack together and break apart.
A LITTLE TEST OF MY AIWA WR-D700 WITH AN “L” INVERTED ANTENNA OF 11 METERS, LISENT RADIO NETHERLAND. LOCATION: QUILPUE, CHILE. CAMERA SONY CYBERSHOT SCD-60
Shortwave radio broadcasting to North Korea is nothing new. The Voice of America has done it for decades, and many other organizations have sprouted up in recent years. The content is often a collaborative effort between South Koreans and North Korean escapees who have taken up residence in the South. But one broadcaster is giving North Korea residents an opportunity to hear from each other. voa’s Kurt Achin reports.
Disclaimer:
This website uses affiliate programs for monetization and creating revenue for the purpose of running a business. This means when you click on a link that brings you to a particular merchant site and you make a purchase, this will result in a commission that is credited to this site.
Some affiliate programs and affiliations include, but are not limited to, Commission Junction, Amazon.com, and ClickBank.
Recent Comments