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Renat Nurgaliyev
2026-07-07 17:25:34 +02:00
parent baeb325922
commit f7de7debbb
1 changed files with 7 additions and 7 deletions
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explanations.json
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@@ -3245,10 +3245,10 @@
"confidence": 8 "confidence": 8
}, },
"AG308": { "AG308": {
"revision": 2, "revision": 3,
"explanation": "Over 60 m at 29 MHz, the cable must stay below 2 dB total loss; the 10.3 mm PE-foam cable is the thinnest listed type meeting that limit.", "explanation": "Over 60 m at 29 MHz the total loss must stay under 2 dB, so pick the lowest-loss cable — not the thinnest. Of the four, the 10.3 mm PE-foam cable has both the largest conductor and a low-loss foam dielectric, so it has the least loss per metre: the thin 4.95 mm RG58 and the thinner 7.3 mm foam cable have more conductor loss, and the equally-thick RG213 loses more because its solid PE dielectric is lossier than foam. Only the 10.3 mm foam cable therefore holds the 60 m run within 2 dB. <u>Hilfsmittel:</u> read dB/100 m at 29 MHz from the Kabeldämpfungsdiagramm Koaxialkabel (S. 22) and scale linearly with length.",
"source": "https://50ohm.de/NEA_kabeldaempfung_2.html#AG308", "source": "https://50ohm.de/NEA_kabeldaempfung_2.html",
"confidence": 8 "confidence": 7
}, },
"AG309": { "AG309": {
"revision": 2, "revision": 2,
@@ -3257,9 +3257,9 @@
"confidence": 8 "confidence": 8
}, },
"AG310": { "AG310": {
"revision": 2, "revision": 3,
"explanation": "At 5.7 GHz even short coax is lossy; among the listed cables, only the 12.7 mm PE-foam type keeps 8 m below 3 dB.", "explanation": "Coax loss falls as the cable gets thicker, so read the per-100 m attenuation at 5.7 GHz off the diagram and scale to the 8 m run ($8\\,\\text{m}$ is $0.08$ of $100\\,\\text{m}$, so the budget is $3\\,\\text{dB}/0.08 = 37.5\\,\\text{dB per }100\\,\\text{m}$). At 5.7 GHz the 12.7 mm <u>and</u> the fatter 16.4 mm PE-foam cables both stay under $3\\,\\text{dB}$ over $8\\,\\text{m}$; the thinner 10.3 mm and 7.3 mm types exceed it. The question asks for the <u>thinnest</u> cable that still meets the $3\\,\\text{dB}$ limit — not the only one that meets it — so the 12.7 mm cable is chosen over the needlessly thick 16.4 mm. <u>Hilfsmittel:</u> the Kabeldämpfungsdiagramm Koaxialkabel (S. 22) — read dB/100 m at the operating frequency and scale linearly with length.",
"source": "https://50ohm.de/NEA_kabeldaempfung_2.html#AG310", "source": "https://50ohm.de/NEA_kabeldaempfung_2.html",
"confidence": 8 "confidence": 8
}, },
"AG311": { "AG311": {