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en:prinzip
Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
| Beide Seiten der vorigen Revision Vorhergehende Überarbeitung Nächste Überarbeitung | Vorhergehende Überarbeitung | ||
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| ==== 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. | ||
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| ===== 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
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