Homework Nine: Difference between revisions
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(New page: '''1. How does Third Harmonic Sampling work? (''The [http://www.groups.yahoo.com/group/softrock40 Soft Rock] receiver uses it.'')''' <br/> '''2. How does the quadrature sampling detector (...) |
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[[Nick Christman|<b><u>Nick Christman</u></b>]]<br/> |
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The ''Softrock 40'' software defined radio (SDR) uses a special technique when sampling the data -- this technique is referred to as '''3rd Harmonic Sampling'''. The purpose of 3rd Harmonic Sampling is to eliminate the need to use a high frequency oscillator which is useful economically and physically. (In other words, a high frequency oscillator is expensive and is often incompatible with "cheaper" switches.) However, nothing in this world is perfect and because of this imperfection, Third Harmonic Sampling have a signal loss of <math>\textstyle 20 \log_{10} (\frac{1}{3}) = -9.54 db</math> (Max Woesner). |
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Revision as of 13:36, 3 December 2009
1. How does Third Harmonic Sampling work? (The Soft Rock receiver uses it.)
2. How does the quadrature sampling detector (QSD) work? (Look at the SDR-1000 QEX articles.)
The Softrock 40 software defined radio (SDR) uses a special technique when sampling the data -- this technique is referred to as 3rd Harmonic Sampling. The purpose of 3rd Harmonic Sampling is to eliminate the need to use a high frequency oscillator which is useful economically and physically. (In other words, a high frequency oscillator is expensive and is often incompatible with "cheaper" switches.) However, nothing in this world is perfect and because of this imperfection, Third Harmonic Sampling have a signal loss of (Max Woesner).
