diff --git a/.env.example b/.env.example
index 7c315ab..8e17525 100644
--- a/.env.example
+++ b/.env.example
@@ -86,3 +86,10 @@ MICROHAM_PTT_DOWN_CMD=
 MICROHAM_PTT_UP_CMD=
 OPENWEBRX_ACCESS_POLICY_FILE=./data/openwebrx-access-policy.txt
 OPENWEBRX_PERSISTENT_USERS_FILE=./data/openwebrx-persistent-users.txt
+# rms.wavelog.cat: push current frequency/mode to Wavelog (CAT radio API).
+# Base URL of the Wavelog instance (no trailing slash). Leave empty to disable.
+WAVELOG_BASE_URL=
+# Radio name shown in Wavelog's Radios list.
+WAVELOG_RADIO_NAME=RMS Remote
+# HTTP timeout for the Wavelog API call (ms).
+WAVELOG_TIMEOUT_MS=8000
diff --git a/docs/plugins/README.md b/docs/plugins/README.md
index 6b52e29..87d1c18 100644
--- a/docs/plugins/README.md
+++ b/docs/plugins/README.md
@@ -18,3 +18,4 @@
 - `rms-vswr-report-reader.md`
 - `rms-vswr-nanovna.md`
 - `rms-station-shell.md`
+- `rms-wavelog-cat.md`
diff --git a/docs/plugins/rms-wavelog-cat.md b/docs/plugins/rms-wavelog-cat.md
new file mode 100644
index 0000000..ace5a9b
--- /dev/null
+++ b/docs/plugins/rms-wavelog-cat.md
@@ -0,0 +1,18 @@
+# rms.wavelog.cat
+
+- Zweck: Aktuelle Stationsfrequenz/-mode an ein Wavelog-Logbuch melden (CAT Radio API).
+  Pushed `POST <baseUrl>/index.php/api/radio` mit dem **per-Operator** Wavelog-API-Key, sodass die
+  Frequenz im persoenlichen Wavelog-Konto des aktiven Operators landet (`cat.user_id` = Key-Besitzer).
+- Capabilities: `logging.cat.publish`.
+- Aktionen: `publish` mit Input `{ frequencyHz, mode, apiKey, baseUrl?, radioName? }`.
+- Wichtige Settings/ENV:
+  - `baseUrl` / `WAVELOG_BASE_URL` – URL der Wavelog-Instanz (ohne Slash am Ende). Leer = deaktiviert.
+  - `radioName` / `WAVELOG_RADIO_NAME` – Anzeigename in Wavelog (Default `RMS Remote`).
+  - `timeoutMs` / `WAVELOG_TIMEOUT_MS` – HTTP-Timeout (Default 8000).
+- Ausloeser: Der Core ruft die Capability beim Bandwechsel (`/v1/openwebrx/bands/select`) auf und
+  uebergibt `centerFreqHz` + `startMod` sowie den Wavelog-Key des aktiven Operators. Best-effort:
+  Fehler brechen den Bandwechsel nie ab.
+- Key-Ablage: pro Benutzer in `users.json` (`wavelogApiKey`), setzbar via `PUT /v1/me/wavelog-key`
+  und sichtbar im OpenWebRX-Panel. **Kein** Key im Repo – der Key ist Laufzeit-/Benutzerdatum.
+- Mode-Mapping: `usb|lsb|ssb → SSB`, `cw|cwr → CW`, `fm|nfm|wfm → FM`, `am|sam → AM`, sonst Rohwert
+  in Grossbuchstaben (Wavelog mappt gaengige Rig-Aliase selbst).
diff --git a/plugins/rms.wavelog.cat/index.js b/plugins/rms.wavelog.cat/index.js
new file mode 100644
index 0000000..1af4b67
--- /dev/null
+++ b/plugins/rms.wavelog.cat/index.js
@@ -0,0 +1,116 @@
+// rms.wavelog.cat
+//
+// Publishes the station's current frequency/mode to a Wavelog logbook via its
+// CAT radio API (`POST <baseUrl>/index.php/api/radio`). The caller passes the
+// per-operator Wavelog API key, so each operator's frequency lands in their own
+// Wavelog account (cat.user_id = key owner).
+//
+// Generic by design (public repo): the Wavelog base URL and radio name come from
+// plugin settings or runtime env, never hardcoded. No secrets are stored here.
+
+const ADIF_MODE_BY_STARTMOD = {
+  usb: "SSB",
+  lsb: "SSB",
+  ssb: "SSB",
+  cw: "CW",
+  cwr: "CW",
+  fm: "FM",
+  nfm: "FM",
+  wfm: "FM",
+  am: "AM",
+  sam: "AM",
+  dmr: "DMR",
+  rtty: "RTTY",
+  ft8: "FT8",
+  ft4: "FT4",
+  psk: "PSK",
+  psk31: "PSK"
+};
+
+function toAdifMode(mode) {
+  const key = String(mode || "").trim().toLowerCase();
+  if (!key) {
+    return "";
+  }
+  if (ADIF_MODE_BY_STARTMOD[key]) {
+    return ADIF_MODE_BY_STARTMOD[key];
+  }
+  // Fall back to the raw value in upper case; Wavelog maps common rig aliases itself.
+  return String(mode).trim().toUpperCase();
+}
+
+async function createPlugin(ctx) {
+  return {
+    async execute(action, input) {
+      if (action !== "publish") {
+        throw new Error(`Unknown action: ${action}`);
+      }
+      return publish(ctx, input || {});
+    },
+    async health() {
+      const baseUrl = resolveBaseUrl(ctx, {});
+      return { ok: true, configured: Boolean(baseUrl) };
+    }
+  };
+}
+
+function resolveBaseUrl(ctx, input) {
+  return String(input.baseUrl || ctx.getSetting("baseUrl", ctx.env.WAVELOG_BASE_URL || ""))
+    .trim()
+    .replace(/\/+$/, "");
+}
+
+async function publish(ctx, input) {
+  const baseUrl = resolveBaseUrl(ctx, input);
+  const apiKey = String(input.apiKey || "").trim();
+  const radio = String(input.radioName || ctx.getSetting("radioName", ctx.env.WAVELOG_RADIO_NAME || "RMS Remote")).trim();
+  const frequencyHz = Math.round(Number(input.frequencyHz));
+  const mode = toAdifMode(input.mode);
+
+  if (!baseUrl) {
+    return { ok: false, skipped: true, reason: "wavelog.baseUrl_missing" };
+  }
+  if (!apiKey) {
+    return { ok: false, skipped: true, reason: "wavelog.apiKey_missing" };
+  }
+  if (!Number.isFinite(frequencyHz) || frequencyHz <= 0) {
+    return { ok: false, skipped: true, reason: "wavelog.frequency_missing" };
+  }
+
+  const payload = {
+    key: apiKey,
+    radio: radio || "RMS Remote",
+    frequency: frequencyHz
+  };
+  if (mode) {
+    payload.mode = mode;
+  }
+
+  const timeoutMs = Number(ctx.getSetting("timeoutMs", ctx.env.WAVELOG_TIMEOUT_MS || 8000));
+  const controller = new AbortController();
+  const timer = setTimeout(() => controller.abort(), Number.isFinite(timeoutMs) ? timeoutMs : 8000);
+  try {
+    const resp = await fetch(`${baseUrl}/index.php/api/radio`, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(payload),
+      signal: controller.signal
+    });
+    const text = await resp.text().catch(() => "");
+    if (!resp.ok) {
+      // Never surface the API key; only status + a short body excerpt.
+      return { ok: false, status: resp.status, body: String(text).slice(0, 200) };
+    }
+    return { ok: true, status: resp.status, radio: payload.radio, frequency: frequencyHz, mode: mode || null };
+  } catch (error) {
+    return { ok: false, error: String(error && error.message ? error.message : error) };
+  } finally {
+    clearTimeout(timer);
+  }
+}
+
+module.exports = {
+  createPlugin,
+  // exported for unit tests
+  toAdifMode
+};
diff --git a/plugins/rms.wavelog.cat/manifest.json b/plugins/rms.wavelog.cat/manifest.json
new file mode 100644
index 0000000..c858c6f
--- /dev/null
+++ b/plugins/rms.wavelog.cat/manifest.json
@@ -0,0 +1,18 @@
+{
+  "id": "rms.wavelog.cat",
+  "name": "Wavelog CAT",
+  "version": "1.0.0",
+  "apiVersion": "1.0",
+  "capabilities": [
+    "logging.cat.publish"
+  ],
+  "settingsSchema": {
+    "type": "object",
+    "properties": {
+      "baseUrl": { "type": "string" },
+      "radioName": { "type": "string" },
+      "timeoutMs": { "type": "number", "minimum": 1000, "maximum": 60000 }
+    },
+    "additionalProperties": false
+  }
+}
diff --git a/public/app.js b/public/app.js
index 50368b0..bd0f3ea 100644
--- a/public/app.js
+++ b/public/app.js
@@ -135,6 +135,9 @@ const els = {
   openwebrxSessionLink: document.getElementById("openwebrxSessionLink"),
   openwebrxCopyLinkBtn: document.getElementById("openwebrxCopyLinkBtn"),
   openwebrxSessionTicket: document.getElementById("openwebrxSessionTicket"),
+  wavelogKeyInput: document.getElementById("wavelogKeyInput"),
+  wavelogKeySaveBtn: document.getElementById("wavelogKeySaveBtn"),
+  wavelogKeyMessage: document.getElementById("wavelogKeyMessage"),
   openwebrxTxStatePill: document.getElementById("openwebrxTxStatePill"),
   rotorCurrent: document.getElementById("rotorCurrent"),
   rotorCompass: document.getElementById("rotorCompass"),
@@ -690,6 +693,11 @@ function bindEvents() {
       await copyOpenWebRxLink();
     });
   }
+  if (els.wavelogKeySaveBtn) {
+    els.wavelogKeySaveBtn.addEventListener("click", async () => {
+      await saveWavelogKey();
+    });
+  }
   if (els.openwebrxEnableTxBtn) {
     els.openwebrxEnableTxBtn.addEventListener("click", async (event) => {
       if (event) {
@@ -1496,6 +1504,8 @@ async function refreshCurrentUser() {
   try {
     const result = await api("/v1/me", { authRequired: true });
     state.user = result.user;
+    state.wavelogApiKey = typeof result.wavelogApiKey === "string" ? result.wavelogApiKey : "";
+    applyWavelogKeyToInput();
     renderUserSettingsAuthMethods();
     await ensureLanguageFromUserPreference();
   } catch {
@@ -1684,12 +1694,37 @@ async function cancelReservationByUserId(userId) {
   }
 }
 
+function applyWavelogKeyToInput() {
+  if (els.wavelogKeyInput) {
+    els.wavelogKeyInput.value = String(state.wavelogApiKey || "");
+  }
+}
+
+async function saveWavelogKey() {
+  if (!els.wavelogKeyInput) {
+    return;
+  }
+  const apiKey = String(els.wavelogKeyInput.value || "").trim();
+  try {
+    const result = await api("/v1/me/wavelog-key", { method: "PUT", body: { apiKey } });
+    state.wavelogApiKey = result && typeof result.wavelogApiKey === "string" ? result.wavelogApiKey : apiKey;
+    applyWavelogKeyToInput();
+    renderMessage(els.wavelogKeyMessage, translateLiteral("Wavelog API Key gespeichert."), false);
+  } catch (error) {
+    renderMessage(els.wavelogKeyMessage, error.message, true);
+  }
+}
+
 async function openOpenWebRxSession() {
   clearMessages("status");
   setOpenWebRxBusy(true);
   try {
     const result = await requestOpenWebRxSessionWithRetry();
     const session = result && result.session ? result.session : null;
+    if (result && typeof result.wavelogApiKey === "string") {
+      state.wavelogApiKey = result.wavelogApiKey;
+      applyWavelogKeyToInput();
+    }
     const sessionTicket = session && session.ticket ? String(session.ticket) : "";
     state.openWebRx.sessionUrl = buildOpenWebRxSessionUrl(session && session.iframeUrl ? session.iframeUrl : "", sessionTicket);
     state.openWebRx.sessionTicket = sessionTicket;
@@ -1715,6 +1750,10 @@ async function openOpenWebRxExternal() {
   try {
     const result = await requestOpenWebRxSessionWithRetry();
     const session = result && result.session ? result.session : null;
+    if (result && typeof result.wavelogApiKey === "string") {
+      state.wavelogApiKey = result.wavelogApiKey;
+      applyWavelogKeyToInput();
+    }
     const sessionTicket = session && session.ticket ? String(session.ticket) : "";
     const sessionUrl = buildOpenWebRxSessionUrl(session && session.iframeUrl ? String(session.iframeUrl) : "", sessionTicket);
     if (!sessionUrl) {
diff --git a/public/i18n/de.json b/public/i18n/de.json
index 616bdee..30fd217 100644
--- a/public/i18n/de.json
+++ b/public/i18n/de.json
@@ -52,6 +52,10 @@
     "OpenWebRX laden": "OpenWebRX laden",
     "SDR oeffnen": "SDR oeffnen",
     "Session Key (Ticket):": "Session Key (Ticket):",
+    "Wavelog API Key (Rig-Key)": "Wavelog API Key (Rig-Key)",
+    "Key speichern": "Key speichern",
+    "Frequenz und Mode der Station werden beim Bandwechsel an dein Wavelog-Logbuch gesendet.": "Frequenz und Mode der Station werden beim Bandwechsel an dein Wavelog-Logbuch gesendet.",
+    "Wavelog API Key gespeichert.": "Wavelog API Key gespeichert.",
     "Reservierungen": "Reservierungen",
     "Naechsten Slot reservieren": "Naechsten Slot reservieren",
     "SWR Uebersicht": "SWR Uebersicht",
diff --git a/public/i18n/en.json b/public/i18n/en.json
index d5dc831..6f5e4e7 100644
--- a/public/i18n/en.json
+++ b/public/i18n/en.json
@@ -52,6 +52,10 @@
     "OpenWebRX laden": "Load OpenWebRX",
     "SDR oeffnen": "Open SDR",
     "Session Key (Ticket):": "Session key (ticket):",
+    "Wavelog API Key (Rig-Key)": "Wavelog API Key (Rig Key)",
+    "Key speichern": "Save key",
+    "Frequenz und Mode der Station werden beim Bandwechsel an dein Wavelog-Logbuch gesendet.": "The station's frequency and mode are sent to your Wavelog logbook on band change.",
+    "Wavelog API Key gespeichert.": "Wavelog API key saved.",
     "Reservierungen": "Reservations",
     "Naechsten Slot reservieren": "Reserve next slot",
     "SWR Uebersicht": "SWR Overview",
diff --git a/public/index.html b/public/index.html
index e2c8bb8..a26bf3a 100644
--- a/public/index.html
+++ b/public/index.html
@@ -166,6 +166,15 @@
               <div id="openwebrxSessionAccess" class="stack" hidden>
                 <p class="muted">Session Key (Ticket): <code id="openwebrxSessionTicket">-</code></p>
               </div>
+              <div id="wavelogKeyBox" class="stack">
+                <label for="wavelogKeyInput">Wavelog API Key (Rig-Key)</label>
+                <input id="wavelogKeyInput" type="text" autocomplete="off" spellcheck="false" placeholder="Wavelog API Key" />
+                <div class="actions">
+                  <button id="wavelogKeySaveBtn" type="button" class="ghost-btn">Key speichern</button>
+                </div>
+                <p id="wavelogKeyMessage" class="message"></p>
+                <p class="muted">Frequenz und Mode der Station werden beim Bandwechsel an dein Wavelog-Logbuch gesendet.</p>
+              </div>
             </section>
 
             <section id="reservationPanel" class="links-wrap" hidden>
diff --git a/server/index.js b/server/index.js
index 82f92c3..02c4033 100644
--- a/server/index.js
+++ b/server/index.js
@@ -358,7 +358,7 @@ async function routeRequest(req, res) {
     if (method === "GET" && url.pathname === "/v1/me") {
       const auth = requireAuth(req, res);
       if (!auth) return;
-      return sendJson(res, 200, { user: sanitizeUser(auth.user), capabilities: userCapabilities(auth.user) });
+      return sendJson(res, 200, { user: sanitizeUser(auth.user), wavelogApiKey: auth.user.wavelogApiKey || "", capabilities: userCapabilities(auth.user) });
     }
 
     if (method === "GET" && url.pathname === "/v1/auth/session/diag") {
@@ -387,6 +387,13 @@ async function routeRequest(req, res) {
       return handleSelfLanguageUpdate(res, auth.user, body);
     }
 
+    if (method === "PUT" && url.pathname === "/v1/me/wavelog-key") {
+      const auth = requireAuth(req, res);
+      if (!auth) return;
+      const body = await readJsonBody(req);
+      return handleSelfWavelogKeyUpdate(res, auth.user, body);
+    }
+
     if (method === "GET" && url.pathname === "/v1/station/status") {
       const auth = requireAuth(req, res);
       if (!auth) return;
@@ -1547,6 +1554,22 @@ async function handleSelfLanguageUpdate(res, user, body) {
   return sendJson(res, 200, { ok: true, user: sanitizeUser(user) });
 }
 
+async function handleSelfWavelogKeyUpdate(res, user, body) {
+  const raw = body && typeof body.apiKey === "string" ? body.apiKey.trim() : "";
+  if (raw.length > 128) {
+    return sendError(res, 400, "user.wavelog_key.invalid", "API Key zu lang");
+  }
+  // Allow empty (clears the key). Otherwise keep it to a conservative token charset.
+  if (raw && !/^[A-Za-z0-9._-]+$/.test(raw)) {
+    return sendError(res, 400, "user.wavelog_key.invalid", "API Key enthaelt ungueltige Zeichen");
+  }
+  user.wavelogApiKey = raw;
+  await writeJson(files.users, runtime.users);
+  // Audit the change WITHOUT storing the key value itself.
+  await appendAudit("user.wavelog_key.update", user, { set: Boolean(raw) });
+  return sendJson(res, 200, { ok: true, wavelogApiKey: raw });
+}
+
 async function handleAdminUserAuthMethodsUpdate(res, actor, pathname, body) {
   const match = pathname.match(/^\/v1\/admin\/users\/([^/]+)\/auth-methods$/);
   if (!match) {
@@ -3615,7 +3638,8 @@ async function handleOpenWebRxSessionIssue(res, user) {
 
   return sendJson(res, 200, {
     ok: true,
-    session: result
+    session: result,
+    wavelogApiKey: user.wavelogApiKey || ""
   });
 }
 
@@ -3682,6 +3706,7 @@ async function handleOpenWebRxBandSelect(res, user, body) {
     runtime.txFollowRoute = antennaRoute;
     runtime.openWebRxAntennaRoute = antennaRoute;
     await appendAudit("openwebrx.band.set", user, { band, result: { centerFreqHz: result.centerFreqHz || null, skipped: Boolean(result.skipped) } });
+    await maybePublishWavelogCat(user, result);
     return sendJson(res, 200, { ok: true, result });
   } catch (error) {
     const message = String(error && error.message ? error.message : error);
@@ -3692,6 +3717,42 @@ async function handleOpenWebRxBandSelect(res, user, body) {
   }
 }
 
+// Push current frequency/mode to the active operator's Wavelog logbook (CAT API).
+// Best-effort: never throws into the band-select flow.
+async function maybePublishWavelogCat(user, bandResult) {
+  try {
+    if (!user || !user.wavelogApiKey) {
+      return;
+    }
+    if (!runtime.pluginState.enabled["rms.wavelog.cat"]) {
+      return;
+    }
+    if (!runtime.pluginState.providers["logging.cat.publish"]) {
+      return;
+    }
+    const frequencyHz = Number(bandResult && bandResult.centerFreqHz);
+    if (!Number.isFinite(frequencyHz) || frequencyHz <= 0) {
+      return;
+    }
+    const outcome = await executeCapability("logging.cat.publish", "publish", {
+      frequencyHz,
+      mode: bandResult && bandResult.startMod ? bandResult.startMod : null,
+      apiKey: user.wavelogApiKey
+    }, { user, skipTxSafety: true });
+    if (!outcome || outcome.ok !== true) {
+      console.warn("wavelog.cat publish not ok", {
+        userId: user.id,
+        reason: outcome && (outcome.reason || outcome.error || outcome.status)
+      });
+    }
+  } catch (error) {
+    console.warn("wavelog.cat publish error", {
+      userId: user.id,
+      error: String(error && error.message ? error.message : error)
+    });
+  }
+}
+
 async function handleOpenWebRxTxEnable(res, user) {
   if (!runtime.station.isInUse || runtime.station.activeByUserId !== user.id) {
     return sendError(res, 403, "openwebrx.not_owner", "OpenWebRX TX nur fuer aktiven Stationsbenutzer");
diff --git a/test/wavelog-cat.test.js b/test/wavelog-cat.test.js
new file mode 100644
index 0000000..4415a78
--- /dev/null
+++ b/test/wavelog-cat.test.js
@@ -0,0 +1,29 @@
+const test = require("node:test");
+const assert = require("node:assert");
+
+const { toAdifMode } = require("../plugins/rms.wavelog.cat/index.js");
+
+test("toAdifMode maps phone submodes to SSB", () => {
+  assert.strictEqual(toAdifMode("usb"), "SSB");
+  assert.strictEqual(toAdifMode("LSB"), "SSB");
+  assert.strictEqual(toAdifMode("ssb"), "SSB");
+});
+
+test("toAdifMode maps cw/fm/am variants", () => {
+  assert.strictEqual(toAdifMode("cw"), "CW");
+  assert.strictEqual(toAdifMode("cwr"), "CW");
+  assert.strictEqual(toAdifMode("nfm"), "FM");
+  assert.strictEqual(toAdifMode("fm"), "FM");
+  assert.strictEqual(toAdifMode("am"), "AM");
+});
+
+test("toAdifMode passes unknown modes through in upper case", () => {
+  assert.strictEqual(toAdifMode("ft8"), "FT8");
+  assert.strictEqual(toAdifMode("c4fm"), "C4FM");
+});
+
+test("toAdifMode returns empty string for empty input", () => {
+  assert.strictEqual(toAdifMode(""), "");
+  assert.strictEqual(toAdifMode(null), "");
+  assert.strictEqual(toAdifMode(undefined), "");
+});