Benutzer-Werkzeuge

Webseiten-Werkzeuge


en:prinzip

Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

Link zu dieser Vergleichsansicht

Beide Seiten der vorigen RevisionVorhergehende Überarbeitung
Nächste Überarbeitung
Vorhergehende Überarbeitung
en:prinzip [2021/04/15 22:23] mben:prinzip [2021/04/16 13:11] (aktuell) mb
Zeile 3: Zeile 3:
  
 ==== Tuned Radio Frequency Receivers (TRF) ==== ==== Tuned Radio Frequency Receivers (TRF) ====
-{{:images:grundlagen-geradeausempfaenger.jpg?direct&400 |}}+{{:images:grundlagen-geradeausempfaenger.jpg?direct&400|}}
  
 In the **[[wp>Tuned radio frequency receiver]]** (TRF), the radio frequency signal from the antenna is selected in a tuned circuit and fed directly to the demodulator. In some cases, the radio frequency is fed to a tuned amplifier stage before demodulation; in most cases, the audio frequency is amplified after demodulation to give more than just headphone reception. In the **[[wp>Tuned radio frequency receiver]]** (TRF), the radio frequency signal from the antenna is selected in a tuned circuit and fed directly to the demodulator. In some cases, the radio frequency is fed to a tuned amplifier stage before demodulation; in most cases, the audio frequency is amplified after demodulation to give more than just headphone reception.
Zeile 42: Zeile 42:
 A typical intermediate frequency often used in domestic radios is 455 kHz. A typical intermediate frequency often used in domestic radios is 455 kHz.
  
-==== double-superhet ====+==== Double conversion superhet ====
 {{:images:grundlagen-doppelsuperhet.jpg?direct&400 |}} {{:images:grundlagen-doppelsuperhet.jpg?direct&400 |}}
 Since receiver developers when deciding about the intermediate frequency always have to find a compromise between the risk of mirror frequencies appearing (the appearance of a double of a strong signal as a "ghost station" in the wrong place on the dial should be prevented) and selectivity, the principle of the **double conversion superhet** or **double conversion** is used in high-quality receivers. Since receiver developers when deciding about the intermediate frequency always have to find a compromise between the risk of mirror frequencies appearing (the appearance of a double of a strong signal as a "ghost station" in the wrong place on the dial should be prevented) and selectivity, the principle of the **double conversion superhet** or **double conversion** is used in high-quality receivers.
Zeile 82: Zeile 82:
  
 ===== Documents ===== ===== Documents =====
-The textbooks of the Swiss Army signal troops, with which the basics can be learned in a step by step self-study approach, are an excellent study source, but they are available only in germ,an (and french) language:+The textbooks of the Swiss Army signal troops, with which the basics can be learned in a step by step self-study approach, are an excellent study source, but they are available only in german (and french) language:
   * [[http://armyradio.wiki/lib/exe/fetch.php?media=manuals:techn-grundlagen-band-1-small.pdf | Technical Basics for Signal Mechanics, Volume 1]]   * [[http://armyradio.wiki/lib/exe/fetch.php?media=manuals:techn-grundlagen-band-1-small.pdf | Technical Basics for Signal Mechanics, Volume 1]]
   * [[http://armyradio.wiki/lib/exe/fetch.php?media=manuals:techn-grundlagen-band-2-small.pdf | Technical Basics for Signal Mechanics, Volume 2]]   * [[http://armyradio.wiki/lib/exe/fetch.php?media=manuals:techn-grundlagen-band-2-small.pdf | Technical Basics for Signal Mechanics, Volume 2]]
  
 ==== Additional information ==== ==== Additional information ====
en/prinzip.1618518186.txt.gz · Zuletzt geändert: 2021/04/15 22:23 von mb