howto:hambasics:sections:practice
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howto:hambasics:sections:practice [2020/10/24 16:59] – va7fi | howto:hambasics:sections:practice [2020/10/24 17:02] – [Selectivity] va7fi | ||
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* A filter that lets high frequencies through but blocks low frequencies is called a //high pass// filter. | * A filter that lets high frequencies through but blocks low frequencies is called a //high pass// filter. | ||
* A filter that lets low frequencies through but blocks high frequencies is called a //low pass// filter. | * A filter that lets low frequencies through but blocks high frequencies is called a //low pass// filter. | ||
- | * Combining a high pass and low pass filter we get a //band pass// filter, which lets audio between two frequencies. | + | * Combining a high pass and low pass filter we get a //band pass// filter, which lets audio between two frequencies. The narrower the bandwidth of the mode we use, the narrower the band pass filter we can use to clean up the audio. |
+ | * An SSB voice signal can use a 2.4 kHz filter where as | ||
+ | * A CW signal can use a much narrower 250 Hz filter. | ||
* The " | * The " | ||
howto/hambasics/sections/practice.txt · Last modified: 2020/12/30 09:08 by va7fi