howto:hambasics:sections:stationassembly
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howto:hambasics:sections:stationassembly [2020/10/07 08:09] – va7fi | howto:hambasics:sections:stationassembly [2020/12/30 09:08] (current) – [Questions] va7fi | ||
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====== HF Station ====== | ====== HF Station ====== | ||
- | {{ :howto: | + | {{ howto: |
Some of the components shown above may be integrated into one device, and others may be optional. | Some of the components shown above may be integrated into one device, and others may be optional. | ||
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===== CW Transmitter ===== | ===== CW Transmitter ===== | ||
- | {{ :howto: | + | {{ howto: |
* The **master oscillator** generates a stable sine wave signal at the rest frequency. | * The **master oscillator** generates a stable sine wave signal at the rest frequency. | ||
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===== FM Transmitter ===== | ===== FM Transmitter ===== | ||
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* The **microphone** picks up the sound waves carried by the air and converts them into a weak electrical signal that becomes the // | * The **microphone** picks up the sound waves carried by the air and converts them into a weak electrical signal that becomes the // | ||
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===== SSB Transmitter ===== | ===== SSB Transmitter ===== | ||
- | {{ :howto: | + | {{ howto: |
* The **microphone** picks up the sound waves carried by the air and converts them into a weak electrical signal that becomes the // | * The **microphone** picks up the sound waves carried by the air and converts them into a weak electrical signal that becomes the // | ||
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Before we look at individual components, there' | Before we look at individual components, there' | ||
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* The **RF amplifier** increases the strength of the weak radio signal received by the antenna. | * The **RF amplifier** increases the strength of the weak radio signal received by the antenna. | ||
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===== SSB/CW Receiver ===== | ===== SSB/CW Receiver ===== | ||
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* The first part is the same as the FM Receiver above. | * The first part is the same as the FM Receiver above. | ||
* The **Beat Frequency Oscillator**: | * The **Beat Frequency Oscillator**: | ||
- | * The **Product Detector** mixes the IF and the BF together to extract the audio frequency (AF = |IF - BF|). | + | * The **Product Detector** mixes the IF and the BF together to extract the audio frequency (AF = |IF - BF|). \\ For example, a receiver with a local oscillator at 3.995 MHz should have its IF tuned to 455 kHz to receive an incoming signal of 3.54 MHz. |
* The **audio amplifier** increases the strength of the baseband signal before passing it to the speaker. | * The **audio amplifier** increases the strength of the baseband signal before passing it to the speaker. | ||
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====== Digital System ====== | ====== Digital System ====== | ||
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* The important conceptual leap here that we want the computer to be able to transmit something. | * The important conceptual leap here that we want the computer to be able to transmit something. | ||
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====== Regulated Power Supply ====== | ====== Regulated Power Supply ====== | ||
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The goal of a regulated power supply is to convert household voltage (120 VAC) into DC voltage for the radio (13.8 VDC). | The goal of a regulated power supply is to convert household voltage (120 VAC) into DC voltage for the radio (13.8 VDC). | ||
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- | ======= Questions | + | ====== Questions ====== |
* B-003-001-001 -> B-003-008-006 | * B-003-001-001 -> B-003-008-006 | ||
+ | * B-003-010-004 -> B-003-010-006 | ||
[[propagation |{{/ | [[propagation |{{/ | ||
howto/hambasics/sections/stationassembly.1602083371.txt.gz · Last modified: 2020/10/07 08:09 by va7fi