Further explanations improvements

explanations.json

@@ -3245,10 +3245,10 @@
     "confidence": 8
   },
   "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": {
     "revision": 2,
@@ -3257,9 +3257,9 @@
     "confidence": 8
   },
   "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
   },
   "AG311": {
@@ -4821,14 +4821,14 @@
     "confidence": 9
   },
   "BD107": {
-    "revision": 4,
+    "revision": 6,
-    "explanation": "DP0GVN is one of the German exterritorial class A station patterns; DP0 is used for special locations outside ordinary German territory. <u>Hilfsmittel:</u> a table lookup — Rufzeichenplan, Suffixe (S. 5): DP0–DP1 = exterritorial class A.",
+    "explanation": "DP0GVN has a 3-letter suffix, so use the Hilfsmittel table for 2- or 3-letter suffixes, not the separate 1-letter club-station table. The sentence directly above that table says the DP series is intended for call signs with exterritorial locations; the DP0-DP1 row then gives class A. So this is an exterritorial class A amateur station. The Gaststreitkraefte distractor is wrong because the same Hilfsmittel text says no special call-sign series are provided for them.",
     "source": "https://50ohm.de/NEA_exterritoriale_stationen.html#BD107",
     "confidence": 8
   },
   "BD108": {
-    "revision": 4,
+    "revision": 6,
-    "explanation": "DP0POL follows the same exterritorial class A pattern as other German Antarctic or special-location stations. <u>Hilfsmittel:</u> a table lookup — Rufzeichenplan, Suffixe (S. 5): DP0–DP1 = exterritorial class A.",
+    "explanation": "DP0POL has a 3-letter suffix, so use the Hilfsmittel table for 2- or 3-letter suffixes, not the separate 1-letter club-station table. The sentence directly above that table says the DP series is intended for call signs with exterritorial locations; the DP0-DP1 row then gives class A. So this is an exterritorial class A amateur station. The Gaststreitkraefte distractor is wrong because the same Hilfsmittel text says no special call-sign series are provided for them.",
     "source": "https://50ohm.de/NEA_exterritoriale_stationen.html#BD108",
     "confidence": 8
   },

references/Hilfsmittel.md

@@ -55,7 +55,9 @@ those are memory items.
 - **S. 5 — Tabelle "Rufzeichen mit 2- oder 3-buchstabigen Suffixen":**
   the main **call-sign-series → class/use** table. DA0 = Klubstation;
   DL1–DL9 = person-bound class A; DO1–DO9 = class E; DN9 = class N;
-  DP0–DP1 = exterritorial class A; etc.
+  DP is intended for exterritorial-location call signs; DP0–DP1 =
+  class A with use categories KS, RL/FB and SZ; DP2 = class E with the
+  same use categories; DP8 = class N with the same use categories.
 - **S. 6** — club-station suffixes (1-char) table.
 - **S. 7** — club-station suffixes (4–7-digit); **§ 5** Kurzzeitzulassungen
   ausländischer Funkamateure (visitors in Germany sign **DL/** class A,