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hambasics:sections:stationassembly [2020/12/30 09:08] – created - external edit 127.0.0.1hambasics:sections:stationassembly [2024/11/24 12:58] (current) – va7fi
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 ====== HF Station ====== ====== HF Station ======
-{{ howto:hambasics:sections:3_1.png }}+{{ hambasics:sections:3_1.png }}
  
 Some of the components shown above may be integrated into one device, and others may be optional.  But if all are included, this is how they should be connected. Some of the components shown above may be integrated into one device, and others may be optional.  But if all are included, this is how they should be connected.
  
-  * The **transceiver** takes the audio from the microphone and creates a [[howto:hambasics:sections:wavemodulation#modulation|modulated radio signal]]. Typical HF radios can output about 100W of power.  Hams with their advanced ticket can feed that into...+  * The **transceiver** takes the audio from the microphone and creates a [[hambasics:sections:wavemodulation#modulation|modulated radio signal]]. Typical HF radios can output about 100W of power.  Hams with their advanced ticket can feed that into...
   * The **amplifier** takes the radio signal from the transceiver and amplifies its power to 1 kW or even 1.5 kW.   * The **amplifier** takes the radio signal from the transceiver and amplifies its power to 1 kW or even 1.5 kW.
   * From there, the signal may contain higher frequencies (called harmonics) that are not desirable, so it goes through a **Low Pass Filter**, which passes low frequencies and filters out high ones.   * From there, the signal may contain higher frequencies (called harmonics) that are not desirable, so it goes through a **Low Pass Filter**, which passes low frequencies and filters out high ones.
-  * After that, the **SWR Bridge** measures how much of the signal is reflected back toward the radio from the antenna system.  We [[howto:hambasics:sections:polarization#wavelength_and_antenna_length|saw earlier]] that the length of the antenna needs to match the frequency we use.  When the match isn't perfect, some of the radio signal "bounces" at the antenna back to the radio, which isn't good for the equipment.  The **SWR Bridge** measures this.+  * After that, the **SWR Bridge** measures how much of the signal is reflected back toward the radio from the antenna system.  We [[hambasics:sections:polarization#wavelength_and_antenna_length|saw earlier]] that the length of the antenna needs to match the frequency we use.  When the match isn't perfect, some of the radio signal "bounces" at the antenna back to the radio, which isn't good for the equipment.  The **SWR Bridge** measures this.
   * A trick we use to protect the radio equipment is to add a **Tuner**.  This device uses varying combinations of capacitors and inductors (more on this later) to match the impedance of the antenna system to the radio (more on that later).  Although there is still reflection at the antenna back toward the radio system, the tuner will "protect" the radio from it.   * A trick we use to protect the radio equipment is to add a **Tuner**.  This device uses varying combinations of capacitors and inductors (more on this later) to match the impedance of the antenna system to the radio (more on that later).  Although there is still reflection at the antenna back toward the radio system, the tuner will "protect" the radio from it.
   * An **Antenna Switch** is a handy piece of equipment to quickly switch between antennas without having to disconnect and connect coax connectors.   * An **Antenna Switch** is a handy piece of equipment to quickly switch between antennas without having to disconnect and connect coax connectors.
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 ===== CW Transmitter ===== ===== CW Transmitter =====
-{{ howto:hambasics:sections:3_4.png }}+{{ hambasics:sections:3_4.png }}
  
   * 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 =====
-{{ howto:hambasics:sections:3_2.png }}+{{ hambasics:sections:3_2.png }}
  
   * The **microphone** picks up the sound waves carried by the air and converts them into a weak electrical signal that becomes the //baseband//.   * The **microphone** picks up the sound waves carried by the air and converts them into a weak electrical signal that becomes the //baseband//.
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 ===== SSB Transmitter ===== ===== SSB Transmitter =====
-{{ howto:hambasics:sections:3_6.png }}+{{ hambasics:sections:3_6.png }}
  
   * The **microphone** picks up the sound waves carried by the air and converts them into a weak electrical signal that becomes the //baseband//.   * The **microphone** picks up the sound waves carried by the air and converts them into a weak electrical signal that becomes the //baseband//.
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 Before we look at individual components, there's an important step we should highlight: The received radio frequency (RF) is converted down to a predetermined intermediate frequency (IF) before being processed further.  This solves a lot of problems that plague simpler receivers.  Now let's look at the details. Before we look at individual components, there's an important step we should highlight: The received radio frequency (RF) is converted down to a predetermined intermediate frequency (IF) before being processed further.  This solves a lot of problems that plague simpler receivers.  Now let's look at the details.
  
-{{ howto:hambasics:sections:3_3.png }}+{{ hambasics:sections:3_3.png }}
  
   * 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 =====
-{{ howto:hambasics:sections:3_5.png }}+{{ hambasics:sections:3_5.png }}
   * 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**: restores the carrier that was suppressed to create the SSB signal.   * The **Beat Frequency Oscillator**: restores the carrier that was suppressed to create the SSB signal.
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 ====== Digital System ====== ====== Digital System ======
-{{ howto:hambasics:sections:3_7.png }}+{{ hambasics:sections:3_7.png }}
  
-  * The important conceptual leap here that we want the computer to be able to transmit something.  That something could be a [[/howto/winlink |Winlink]] message, [[howto/aprs |APRS]] telemetry, a live [[howto/js8 |JS8]] chat, or any other kind of data.   +  * The important conceptual leap here that we want the computer to be able to transmit something.  That something could be a [[/links/winlink |Winlink]] message, [[links/aprs |APRS]] telemetry, a live [[links/js8 |JS8]] chat, or any other kind of data.   
-  * That data needs to be [[howto:hambasics:sections:digitalconcepts|modulated into a sound]] that can then be transmitted by the radio. +  * That data needs to be [[hambasics:sections:digitalconcepts|modulated into a sound]] that can then be transmitted by the radio. 
-  * A modem (MOdulator/DEModulator) or a soundcard like the [[/howto/signalink |Signalink]] can do that.  But some radios like the [[/howto/7300digital |IC-7300]] can connect directly to the computer using a USB cable.+  * A modem (MOdulator/DEModulator) or a soundcard like the [[/links/signalink |Signalink]] can do that.  But some radios like the [[/links/7300digital |IC-7300]] can connect directly to the computer using a USB cable.
  
  
  
 ====== Regulated Power Supply ====== ====== Regulated Power Supply ======
-{{ howto:hambasics:sections:3_8.png }}+{{ hambasics:sections:3_8.png }}
  
 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).
hambasics/sections/stationassembly.1609348115.txt.gz · Last modified: by 127.0.0.1