Finished chapter 4, Amateur Radio Practices in the American Radio Relay League (ARRL) Extra class license manual. There are five questions on the exam regarding Amateur Radio practices and I scored 94 percent on element four.
Definitions of Interest According to License Manual (p 3-27,28).
- Bandwidth is, "Frequency range measured in hertz (Hz) over which a signal is stronger than some specified amount below the peak signal level."
- Conducted noise is, "Electrical noise that is imparted to a radio receiver or transmitter through the power connections to the radio."
- Dynamic range is, "An ability of a receiver to tolerate strong signals outside the band-pass range."
- Noise floor is, "A receiver input signal that produces an audio output of the same strength as the internally generated noise in the receiver."
I enjoyed reading about receiver performance concepts especially the front-end and distortion effects leading to blocking. According to the manual, "The theoretical noise power at the input of a receiver with an input-filter bandwidth of 1 hertz is a -174 dBm." (p 4-18)
A -174 dBm is the best possible noise floor for a receiver as suggested by the manual.
This chapter helped me understand my Yaesu FT100 receiver a little more. Good stuff and now I'm going into Chapter 5, Electrical Principles and I'm ready for a neuron bending experience.
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