howto:hambasics:b003
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howto:hambasics:b003 [2019/11/27 18:16] – [HF Station] ve7hzf | howto:hambasics:b003 [2020/02/20 19:04] – [Transmitters] va7fi | ||
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- | <box orange | + | |<100% ----- >| |
- | '' | + | | [[home |Ham Basics]] |
- | </box> | + | |
+ | <WRAP round todo center box 60%> | ||
+ | **Under Construction**: VA7FI is editing this section, please do not edit it until this notice is taken down. | ||
+ | </WRAP> | ||
====== Station Assembly, Practice and Safety ====== | ====== Station Assembly, Practice and Safety ====== | ||
+ | |||
+ | ===== Block Diagrams ===== | ||
+ | The next few sections use block diagrams to illustrate the configuration of various pieces of equipment. | ||
+ | |||
+ | {{ youtube> | ||
===== HF Station ===== | ===== HF Station ===== | ||
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All that being said, it's possible to go on HF with a transceiver that has an small integrated tuner in it, and a single antenna. | All that being said, it's possible to go on HF with a transceiver that has an small integrated tuner in it, and a single antenna. | ||
- | ===== To Review | + | ===== Transmitters |
+ | <WRAP round info box center 80%> | ||
+ | **Review** the [[wavemodulation |Wave Modulation]] page. You should: | ||
+ | * understand the difference between the // | ||
+ | * understand the difference between //AM// and //FM//. | ||
+ | </ | ||
- | <box blue 80%> | ||
- | For the next few sections, review the [[wavemodulation |Wave Modulation]] page. You should understand: | ||
- | * the difference between the // | ||
- | * the difference between //AM// and //FM// | ||
- | </ | ||
- | ===== FM Transmitter ===== | + | ==== CW Transmitter ==== |
+ | {{ : | ||
+ | * The **master oscillator** generates a stable sine wave signal at the rest frequency. | ||
+ | * The **driver / buffer** is the first stage in the amplification process. | ||
+ | * The **key** is basically an on/off switch used to let the signal through to the amplifier or block it. | ||
+ | * The **power amplifier** is the last stage of amplification before the signal is released to the antenna. | ||
+ | |||
+ | |||
+ | ==== FM Transmitter ==== | ||
{{ : | {{ : | ||
- | * The **microphone** picks up the sound wave carried by the air and converts them into a weak electrical signal | + | * The **microphone** picks up the sound waves carried by the air and converts them into a weak electrical signal |
- | * The **speech amplifier** | + | * The **speech amplifier** |
- | * The **modulator** uses the base band signal to change the carrier oscillator frequency in the next stage. | + | * The **modulator** uses the baseband |
- | * The **oscillator** generates a stable sine wave signal at the rest frequency when no modulation is applied. Its frequency changes linearly when fully modulated with no measurable change in amplitude. | + | * The **oscillator** generates a stable sine wave signal at the rest frequency when no modulation is applied. Its frequency changes linearly when fully modulated with no measurable change in amplitude. Note that the oscillator frequency can be much lower than the final transmitted frequency. |
- | * The **frequency multiplier** | + | * The **frequency multiplier** increases the frequency |
* The **amplifier** increases the power of the signal to be transmitted by the antenna. | * The **amplifier** increases the power of the signal to be transmitted by the antenna. | ||
- | The positive peak of the message signal generally lowers the oscillator' | ||
- | ===== FM Receiver ===== | + | ==== SSB Transmitter ==== |
+ | {{ : | ||
+ | |||
+ | * The **microphone** picks up the sound waves carried by the air and converts them into a weak electrical signal that becomes the // | ||
+ | * The **speech amplifier** increases the strength of the baseband signal before it can modulate the carrier. | ||
+ | * The **RF oscillator** generates a stable sine wave signal at the rest frequency. Note that the oscillator frequency can be much lower than the final transmitted frequency. | ||
+ | * The outputs of the speech amplifier and the RF oscillator are mixed together in the **balanced modulator**. This produces a signal with two side bands, only one of which we want to keep. | ||
+ | * The **filter** only lets one sideband through. | ||
+ | * The **VFO** creates a sine wave frequency that can be varied. | ||
+ | * The **mixer** uses the output from the filter and the VFO to generate a higher frequency signal. | ||
+ | * The **linear amplifier** increases the power of the signal to be transmitted by the antenna. | ||
+ | |||
+ | <WRAP important center round 80%> | ||
+ | Note that a [[wp> | ||
+ | </ | ||
+ | |||
+ | ===== Receivers ===== | ||
+ | |||
+ | ==== FM Receiver ==== | ||
+ | Before we look at individual components, there' | ||
{{ : | {{ : | ||
- | ====== Questions ====== | + | * The **RF amplifier** increases the strength of the weak radio signal received by the antenna. |
+ | * The **local oscillator** creates pure sine wave that can be tuned by the listener. | ||
+ | * The **mixer** takes in the RF signal and mixes it with the pure sine wave from the local oscillator. | ||
+ | * The **filter** removes unwanted frequency created by the mixer and lets the IF pass through to the next stage. | ||
+ | * The **IF amplifier** increases the strength of the IF signal. | ||
+ | * At this point, the signal' | ||
+ | * The **frequency discriminator** extracts the baseband signal. | ||
+ | * The **audio amplifier** increases the strength of the baseband signal before passing it to the speaker. | ||
- | [[sections | + | |
+ | ==== SSB/CW Receiver ==== | ||
+ | {{ : | ||
+ | |||
+ | ===== Digital System ===== | ||
+ | {{ : | ||
+ | |||
+ | |||
+ | ===== Regulated Power Supply ===== | ||
+ | {{ : | ||
+ | |||
+ | ====== Questions ====== | ||
+ | * B-003-001-001 -> B-003-003-010 | ||
+ | |||
+ | [[propagation | ||