howto:hambasics:sections:practice
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revisionLast revisionBoth sides next revision | ||
howto:hambasics:sections:practice [2020/10/24 16:29] – [Selectivity] va7fi | howto:hambasics:sections:practice [2020/11/08 16:39] – [Stability] va7fi | ||
---|---|---|---|
Line 48: | Line 48: | ||
==== Filters ==== | ==== Filters ==== | ||
- | Sometimes | + | Sometimes |
- | * 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. |
- | * A filter | + | |
+ | * An SSB voice signal can use a 2.4 kHz filter where as | ||
+ | | ||
+ | * The " | ||
{{ notch1a.png }} | {{ notch1a.png }} | ||
Line 57: | Line 60: | ||
This picture has three main parts. | This picture has three main parts. | ||
- The frequency is 7.100 MHz on LSB. | - The frequency is 7.100 MHz on LSB. | ||
- | - The scope shows this frequency relative to the entire band (7.00 Mhz to 7.3 Mhz) | + | - 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 (with a 2.4 kHz band pass filter). |
- | You'll notice that there' | + | You'll notice that there' |
<WRAP centeralign> | <WRAP centeralign> | ||
Line 67: | Line 70: | ||
- | ===== Stability ===== | ||
+ | ===== Stability ===== | ||
+ | This is the ability of a receiver to stay on the right frequency and not //drift//. | ||
====== Transmitters ====== | ====== Transmitters ====== |
howto/hambasics/sections/practice.txt · Last modified: 2020/12/30 09:08 by va7fi