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The Basement
FM transmissions and the Doppler effect.
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<blockquote data-quote="Jason Glass" data-source="post: 80107" data-attributes="member: 2167"><p>Re: FM transmissions and the Doppler effect.</p><p></p><p>Hi Chris,</p><p></p><p>Bennett is right on in his answers, but if you'd like to delve a little deeper into the subject, check out <a href="http://vkradio.com/doppler.html" target="_blank">A Closeup of Doppler Shift</a>. It contains some tables and graphs showing Doppler shift vs. frequency that we see on Earth when the transmissions originate from Low Earth Orbit Satellites traveling at a minimum of 17,500MPH. For comparison, there is also a table showing the values when the TX originates from a car traveling at 100KM/H.</p><p></p><p>Interestingly enough, the maximum shift from those high velocity sources is still within the deviation tolerance (usually +/- 25KHz) of our pro audio wireless gear at similar frequencies.</p><p></p><p>Here's an interesting thread about the subject where some of the contributors show the equations and explain the math; <a href="http://cosmoquest.org/forum/showthread.php/12727-Doppler-Effect-on-FM" target="_blank">Doppler Effect on FM</a>.</p></blockquote><p></p>
[QUOTE="Jason Glass, post: 80107, member: 2167"] Re: FM transmissions and the Doppler effect. Hi Chris, Bennett is right on in his answers, but if you'd like to delve a little deeper into the subject, check out [URL="http://vkradio.com/doppler.html"]A Closeup of Doppler Shift[/URL]. It contains some tables and graphs showing Doppler shift vs. frequency that we see on Earth when the transmissions originate from Low Earth Orbit Satellites traveling at a minimum of 17,500MPH. For comparison, there is also a table showing the values when the TX originates from a car traveling at 100KM/H. Interestingly enough, the maximum shift from those high velocity sources is still within the deviation tolerance (usually +/- 25KHz) of our pro audio wireless gear at similar frequencies. Here's an interesting thread about the subject where some of the contributors show the equations and explain the math; [URL="http://cosmoquest.org/forum/showthread.php/12727-Doppler-Effect-on-FM"]Doppler Effect on FM[/URL]. [/QUOTE]
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