SuperminarenandClaude Sonnet 5.5
f7fa8cfbc1
- Sections and slides rewritten in Swedish; German law and institutions replaced by Swedish/CEPT/ITU equivalents (PTS, SSA, PTSFS 2025:1, SSMFS 2008:18), unverified statements marked "% TODO VERIFY" - New toc: INSTEG, HAREC, UPPGRADERING; section idents are Swedish (see ident-map.tsv) - Exam-question tags, BNetzA question pool, solutions and the German SWL course removed - Static pages, snippets, applets, READMEs and image alt-texts translated - TikZ labels translated; SVG drawings regenerated (drawing 689 still fails to build upstream: it references a missing photo) - Changed from the original: not endorsed by DARC e.V., SSA or PTS Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
28 lines
713 B
Markdown
28 lines
713 B
Markdown
## Frekvensmodulation
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<left>
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* Konstant amplitud
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* Varierande frekvens
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* Relativt okänslig för amplitudstörningar (t.ex. fordon, blixtar)
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</left>
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<right>
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[picture:301:e_fm:Frekvensmodulation]
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</right>
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---
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## Frekvenssvep
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<left>
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* Ljudstyrkeinformation överförs vid FM genom *bärvågsutslag* (frekvenssvep)
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* Stark LF-signal $\rightarrow$ större svep $\rightarrow$ högre bandbredd
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</left>
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<right>
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[picture:827:e_frequenzmodulation_frequenzhub:Bärvågsutslag vid frekvensmodulation]
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</right>
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---
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## Modulation
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* För att begränsa bandbredden begränsas mikrofonsignalen i amplitud
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* Signalen moduleras sedan på bärvågen med FM
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* Frekvenssvepet kan vara fast eller inställbart med en svepreglering
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