howto:hambasics:b003
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howto:hambasics:b003 [2019/12/14 21:42] – [To Review] va7fi | howto:hambasics:b003 [2020/02/20 18:59] – [Transmitters] va7fi | ||
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+ | |<100% ----- >| | ||
+ | | [[home |Ham Basics]] | ||
+ | |||
<WRAP round todo center box 60%> | <WRAP round todo center box 60%> | ||
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====== 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. | ||
+ | ===== 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//. | ||
+ | </ | ||
+ | |||
+ | |||
+ | ==== 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 ===== | ||
+ | ==== FM Transmitter ==== | ||
{{ : | {{ : | ||
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* 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. | ||
- | ===== 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' | ||
{{ : | {{ : | ||
- | Before we look at individual components, it's important to highlight an important trick: The received radio frequency (RF) is converted down to a predetermined intermediate frequency (IF) before being processed further. | ||
* 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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* 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. | ||
- | ===== CW Transmitter ===== | ||
- | {{ : | ||
- | ===== SSB/CW Receiver | + | ==== SSB/CW Receiver ==== |
{{ : | {{ : | ||
- | |||
- | |||
- | ===== SSB Transmitter ===== | ||
- | {{ : | ||
- | |||
===== Digital System ===== | ===== Digital System ===== | ||
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* B-003-001-001 -> B-003-003-010 | * B-003-001-001 -> B-003-003-010 | ||
- | [[sections | + | [[propagation |