So here is a serious hi-fi AM tuner, from 1947, the Leak VS where you can adjust the bandwidth of the IF filter to get the best sound from any station you tune. Naturally you had to compromise between high fidelity (this was before AM transmitters were tightly regulated as to how much spectrum they could broadcast!) and rejecting interference, and no one compromise would work for all situations. Some attempts to fix this included the "Stenode" which claimed to maintain tight tuning "so that a signal only 1 kHz away from the carrier could be eliminated" without impairing audio fidelity.īy 1934 this was debunked as a fraud (sorry I can't find online references to that!)though some radio makers still called a treble boost circuit to flatten the response a "stenode" circuit.īy that stage (1934) "sideband theory" was widely accepted, and as it was easiest to detune a filter to set the correct filter bandwidth once and leave it there, the superhet "supersonic heterodyne" radio took over from the simpler "straight" sets. The result was a bass-heavy, dull sound accused of being "drummy". Radio Tuner Images Browse 95,687 Stock Photos, Vectors, and Video Adobe Stock Get 10 free Adobe Stock images. People discovered that tuned circuits could be "too good" selecting the carrier and the sideband components closest to it, allowing only the LF part of the audio spectrum to be reproduced. When you start your HamSphere transceiver you will have the look, feel and sound of a real Amateur Radio transceiver.This was a big debate in the early 1930s, when high performance tuned circuits started becoming practical (either through triple-ganged tuning or superhet) and the "short wave" (now medium wave or AM) band started getting crowded. The ionization due to the radiations from the sun based on Sunspot Numbers (SSN) and the Solar Flux Index (SFI) determine the behavior of the Ionosphere and follow the 11 year solar cycle. It also models hundreds of kilometers of atmosphere above the earth's surface, the ionization of gases in the upper atmosphere to realistically produce ionospheric layers. The tuner has very high selectivity - for FM, it has 16 different filters that applied to minimize interference from adjacent channels, and improve the. The FM portion is amazing - it can tune both older analog FM signals and newer digital HD Radio broadcasts. i have a sharper image cd/tuner model ph 130 but c. The Sony XDR-F1HD is a very sophisticated radio AM/FM tuner in a small package. The HamSphere propagation model takes in to account the physics of planet Earth, its surface topography like the continents, land masses, water bodies, oceans, Car Satellite Radio Manuals Car Satellite TV Manuals Headphones Manuals Computer Monitor Manuals. We are talking about the propagation conditions. Radio Tuner stock photos are available in a variety of sizes and formats to fit your needs. how well we can reach distant places by radio worldwide. Browse Getty Images premium collection of high-quality, authentic Radio Tuner stock photos, royalty-free images and pictures. Because it is also the main cause for what can be achieved on shortwave and other bands, i.e. The main purpose of this PoC project was to verify how far HTML5 could achieve performance and functionalities of FM radio tuner. HamSphere is a unique platform, the only one of its kind in the world providing the experience of a realistic HF radio.įor radio amateurs, the sun has a very special meaning.
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