Differences

This shows you the differences between two versions of the page.

--- howto:hambasics:sections:practice [2020/10/24 16:46] – [Selectivity] va7fi
+++ howto:hambasics:sections:practice [2020/10/24 16:54] – [Selectivity] va7fi
@@ Line 58: / Line 58: @@
   - The frequency is 7.100 MHz on LSB.
   - The scope shows this frequency relative to the entire band (7.000 Mhz to 7.300 Mhz)
-  - At the bottom is the audio spectrum of what we can here (300 Hz to 2.5 kHz)
+  - At the bottom is the audio spectrum of what we hear (300 Hz to 2.5 kHz)
-You'll notice that there's a very intense line around 1.5 kHz on the audio spectrum.  This line translates to a loud note (a little above \$ \text{F}_{6}^{\text{#}} \$  for the musicians out there) mixed with the voice.  To remove this tone, we can "notch" it.  We now see a dark spot around 1.5 kHz.  If we need to, we can make this spot more or less wide.
+You'll notice that there's a very intense line around 1.5 kHz on the audio spectrum.  This line, coming from an interfering carrier signal, sounds like a loud note (a little above \$ \text{F}_{6}^{\text{#}} \$  for the musicians out there) mixed with the voice.  To remove this tone, we can "notch" it.  We now see a dark spot around 1.5 kHz.  If we need to, we can make this spot more or less wide.
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