Sun Coast Amateur
Radio Club Society

User Tools

Site Tools

You are here: home » howto » hambasics » sections » stationassembly
howto:hambasics:sections:stationassembly

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
howto:hambasics:sections:stationassembly [2020/10/07 08:01] – ↷ Page moved from howto:hambasics:stationassembly to howto:hambasics:sections:stationassembly va7fihowto:hambasics:sections:stationassembly [2020/12/30 09:08] (current) – [Questions] va7fi
Line 1: Line 1:
-|<100% ----- >| 
-|  [[home |Ham Basics]]  |  [[test |About The Test]]  |  [[Reference |References]]  ^  [[sections |Study Sections]]  | 
- 
- 
 ====== Block Diagrams ====== ====== Block Diagrams ======
 The next few sections use block diagrams to illustrate the configuration of various pieces of equipment.  Here's an excellent introduction that should help with what follows: The next few sections use block diagrams to illustrate the configuration of various pieces of equipment.  Here's an excellent introduction that should help with what follows:
Line 10: Line 6:
  
 ====== HF Station ====== ====== HF Station ======
-{{ :howto:hambasics:3_1.png }}+{{ howto: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/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 [[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 **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/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 [[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.
   * 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.
Line 36: Line 32:
  
 ===== CW Transmitter ===== ===== CW Transmitter =====
-{{ :howto:hambasics:3_4.png }}+{{ howto: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.
Line 45: Line 41:
  
 ===== FM Transmitter ===== ===== FM Transmitter =====
-{{ :howto:hambasics:3_2.png }}+{{ howto: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//.
Line 56: Line 52:
  
 ===== SSB Transmitter ===== ===== SSB Transmitter =====
-{{ :howto:hambasics:3_6.png }}+{{ howto: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//.
Line 76: Line 72:
 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:3_3.png }}+{{ howto: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.
Line 89: Line 85:
  
 ===== SSB/CW Receiver ===== ===== SSB/CW Receiver =====
-{{ :howto:hambasics:3_5.png }}+{{ howto: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.
-  * 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.
  
Line 100: Line 96:
  
 ====== Digital System ====== ====== Digital System ======
-{{ :howto:hambasics:3_7.png }}+{{ howto: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 [[/howto/winlink |Winlink]] message, [[howto/aprs |APRS]] telemetry, a live [[howto/js8 |JS8]] chat, or any other kind of data.  
-  * That data needs to be [[/howto/hambasics/digitalconcepts |modulated into a sound]] that can then be transmitted by the radio.+  * That data needs to be [[howto: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 [[/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.
  
Line 109: Line 105:
  
 ====== Regulated Power Supply ====== ====== Regulated Power Supply ======
-{{ :howto:hambasics:3_8.png }}+{{ howto: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).
Line 119: Line 115:
    
  
-======= 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 |{{/back.png }}]] [[practice |{{  /next.png}}]] [[propagation |{{/back.png }}]] [[practice |{{  /next.png}}]]
  
howto/hambasics/sections/stationassembly.1602082893.txt.gz · Last modified: 2020/10/07 08:01 by va7fi