chore: release v0.23.6

The Ctrl+↑/↓ keyboard-nav useEffect sat AFTER `if (!range) return`, so on a band
with no range — e.g. a spurious 33 cm frequency briefly reported by an Icom over
CAT — the component returned before that hook and the hook count changed between
renders, crashing the whole window with React #300. Moved the effect above the
early return; lo/hi already fall back to [0,1] when there's no range.

app.go

@@ -2400,6 +2400,19 @@ func (a *App) groupDigitalSlots() bool {
 	return v == "1"
 }
 
+// clusterWorkedSameSlot reports the "consider a call already worked only if
+// worked on the SAME band+mode slot" cluster preference (Settings → DX Cluster).
+// Off (default) → a call worked on any band/mode reads as already worked. On →
+// the WORKED-call flag needs the same band and mode (digital-grouped when that
+// option is also on).
+func (a *App) clusterWorkedSameSlot() bool {
+	if a.settings == nil {
+		return false
+	}
+	v, _ := a.settings.Get(a.ctx, "ui.opslog.clusterWorkedSameSlot")
+	return v == "1"
+}
+
 func (a *App) GetUIPref(key string) (string, error) {
 	if a.settings == nil || !a.settingsScoped.Load() {
 		// Distinct from a genuinely-empty pref: the (LOCAL SQLite) settings store
@@ -15925,6 +15938,14 @@ func (a *App) ClusterSpotStatuses(spots []SpotQuery) []SpotStatus {
 	// "I've already QSO'd this exact station" even when the band/mode
 	// makes the entity check say "new-band" or "new-slot".
 	workedCalls, _ := a.qso.WorkedCallsigns(a.ctx)
+	// "Already worked only on the same slot" option (Settings → DX Cluster): the
+	// WORKED-call flag then needs the SAME band and mode (digital-grouped through
+	// the same normMode when that option is on) rather than the call anywhere.
+	sameSlot := a.clusterWorkedSameSlot()
+	var workedCallSlots map[string]struct{}
+	if sameSlot {
+		workedCallSlots, _ = a.qso.WorkedCallSlotKeys(a.ctx, normMode)
+	}
 	// Orthogonal dimensions: worked US counties (for the ULS callsign→county
 	// lookup) and worked POTA parks. Both built once per batch.
 	workedCounties, _ := a.qso.WorkedCountyKeys(a.ctx, award.USCountyKey)
@@ -15945,7 +15966,21 @@ func (a *App) ClusterSpotStatuses(spots []SpotQuery) []SpotStatus {
 			Band: strings.ToLower(q.Band),
 			Mode: strings.ToUpper(q.Mode),
 		}
-		if _, ok := workedCalls[strings.ToUpper(q.Call)]; ok {
+		if sameSlot {
+			// Already worked ONLY when this exact band+mode slot was worked. With no
+			// inferable mode, fall back to same-band (better than claiming the whole
+			// call is fresh). Digital grouping folds through the same normMode.
+			upCall := strings.ToUpper(q.Call)
+			if out[i].Mode == "" {
+				_, out[i].WorkedCall = workedCallSlots[upCall+"|"+out[i].Band]
+			} else {
+				cm := out[i].Mode
+				if normMode != nil {
+					cm = normMode(cm)
+				}
+				_, out[i].WorkedCall = workedCallSlots[upCall+"|"+out[i].Band+"|"+cm]
+			}
+		} else if _, ok := workedCalls[strings.ToUpper(q.Call)]; ok {
 			out[i].WorkedCall = true
 		}
 		// NEW PFX: the spot's CQ WPX prefix, never worked before.

changelog.json

@@ -14,7 +14,12 @@
       "The Grid box no longer pops outside the QSO entry panel when the window is narrowed — it wraps to its own line instead.",
       "Selecting a QSO in the Recent QSOs list now shows that station in the Stats (F1) matrix, instead of leaving it blank.",
       "Stats (F1): click any coloured band/mode square to list the contacts behind it.",
-      "Awards: the DXCC list now shows each entity’s main prefix (XE, DL, F…) in its own sortable, searchable column."
+      "Awards: the DXCC list now shows each entity’s main prefix (XE, DL, F…) in its own sortable, searchable column.",
+      "DX Cluster: new option \"Already worked only on the same slot\" (Settings → DX Cluster). With it on, a spot reads \"worked\" only when you worked that callsign on the SAME band and mode — not just anywhere. It respects the digital-mode grouping (Settings → General): grouped, a 20m FT8 contact also marks a 20m FT4 spot as worked; ungrouped, FT8 and FT4 are separate slots.",
+      "DX Cluster: added a WORKED status-filter chip, so you can show — or, with the other chips off, isolate — already-worked spots, not only hide them with the \"Hide worked\" checkbox.",
+      "DX Cluster: spots that represent nothing — entity/band/mode already worked, the callsign not in your log, no POTA/county/prefix novelty — are now dimmed, so your eye skips them and the spots worth working stand out. What counts as \"nothing\" follows the \"same slot\" option and the digital-mode grouping.",
+      "Ultrabeam: an older controller (seen over an RS232-to-Ethernet bridge) answers with an 11-byte status frame instead of 12. OpsLog rejected it as \"too short\" and reconnect-looped; it now accepts a shorter checksum-valid frame and defaults the missing tail field.",
+      "Fixed a crash (React #300) that could take down the whole window when the rig briefly reported an unusual band — for example a spurious 33 cm reading from an Icom. The Band Map had a keyboard-navigation hook after its early return for unknown bands, so the number of hooks changed between renders. The hook now always runs."
     ],
     "fr": [
       "Visionneuse de log : la fenêtre conserve deux fois plus d'historique (512 Ko au lieu de 256 Ko, ~3200 lignes). Lors d'une trace chargée, les plus vieilles lignes défilaient hors du buffer pendant qu'on les lisait encore ; la fenêtre agrandie les garde.",
@@ -28,7 +33,12 @@
       "Le champ Locator ne déborde plus du panneau de saisie quand la fenêtre est rétrécie — il passe à la ligne.",
       "Sélectionner un QSO dans la liste des QSO récents affiche désormais cette station dans la matrice Stats (F1), au lieu de la laisser vide.",
       "Stats (F1) : cliquer sur une case bande/mode colorée liste les contacts correspondants.",
-      "Diplômes : la liste DXCC affiche le préfixe principal de chaque entité (XE, DL, F…) dans une colonne triable et cherchable."
+      "Diplômes : la liste DXCC affiche le préfixe principal de chaque entité (XE, DL, F…) dans une colonne triable et cherchable.",
+      "DX Cluster : nouvelle option « Déjà contacté seulement sur le même slot » (Réglages → DX Cluster). Activée, un spot n'affiche « contacté » que si vous avez contacté cet indicatif sur la MÊME bande et le MÊME mode — pas juste n'importe où. Elle respecte le groupage des modes numériques (Réglages → Général) : groupé, un contact 20m FT8 marque aussi un spot 20m FT4 comme contacté ; dégroupé, FT8 et FT4 sont des slots distincts.",
+      "DX Cluster : ajout d'un filtre de statut WORKED, pour afficher — ou, en désactivant les autres, isoler — les spots déjà contactés, pas seulement les masquer avec la case « Masquer les contactés ».",
+      "DX Cluster : les spots qui ne représentent rien — entité/bande/mode déjà faite, indicatif absent du journal, aucune nouveauté POTA/comté/préfixe — sont désormais atténués, pour que l'œil les ignore et que les spots à travailler ressortent. Ce qui compte comme « rien » suit l'option « même slot » et le groupage des modes numériques.",
+      "Ultrabeam : un contrôleur plus ancien (vu derrière un pont RS232-Ethernet) répond avec une trame de statut de 11 octets au lieu de 12. OpsLog la rejetait comme « trop courte » et bouclait en reconnexion ; il accepte désormais une trame valide plus courte et met par défaut le champ de fin manquant.",
+      "Correction d'un plantage (React #300) qui pouvait faire tomber toute la fenêtre quand la radio rapportait brièvement une bande inhabituelle — par exemple une lecture 33 cm parasite d'un Icom. La Band Map avait un hook de navigation clavier après son retour anticipé pour les bandes inconnues, changeant le nombre de hooks entre deux rendus. Le hook est désormais toujours exécuté."
     ]
   },
   {

frontend/src/App.tsx

@@ -4490,11 +4490,14 @@ export default function App() {
         const k = spotStatusKey(s.dx_call, s.band ?? '', s.comment ?? '', s.freq_hz);
         const e = spotStatus[k];
         const st = (e?.status || '') as SpotStatusKey;
-        // A previously-worked call counts as WORKED for filtering even when its
-        // entity status is still new-band/new-slot (the grid flags it WKD CALL),
-        // matching the "Hide worked" toggle. Additive: it still matches its own
-        // entity status too, so it stays visible under NEW BAND / NEW SLOT.
-        const matches = clusterStatusFilter.has(st)
+        // WORKED means "I've worked THIS callsign" — the blue WKD-CALL flag —
+        // NOT the entity status 'worked' (entity/band/mode already worked, which
+        // the grid shows as a plain "—"). So the 'worked' key is matched ONLY via
+        // worked_call below; exclude the entity status 'worked' from the generic
+        // match, or every "already-worked-entity" spot would slip through. A
+        // worked call still matches its own entity status too (new-band/new-slot),
+        // so it stays visible under those chips.
+        const matches = (st !== 'worked' && clusterStatusFilter.has(st))
           || (!!e?.worked_call && clusterStatusFilter.has('worked'))
           || (!!e?.new_pota && clusterStatusFilter.has('new-pota'))
           || (!!e?.new_county && clusterStatusFilter.has('new-county'))
@@ -4619,7 +4622,10 @@ export default function App() {
               { k: 'new-pota'   as SpotFilterKey, label: 'NEW POTA',   cls: 'bg-success-muted text-success-muted-foreground border-success-border' },
               { k: 'new-county' as SpotFilterKey, label: 'NEW COUNTY', cls: 'bg-success-muted text-success-muted-foreground border-success-border' },
               { k: 'new-pfx'    as SpotFilterKey, label: 'NEW PFX',    cls: 'bg-caution-muted text-caution-muted-foreground border-caution-border' },
-              // (no WORKED chip — use the "Hide worked" checkbox to drop dupes.)
+              // Blue, like the already-worked call in the grid. Selecting it keeps
+              // worked spots; the separate "Hide worked" checkbox drops them — they
+              // are opposite controls, so don't use both at once.
+              { k: 'worked'   as SpotFilterKey, label: 'WORKED',   cls: 'bg-info-muted text-info-muted-foreground border-info-border' },
             ]).map((s) => {
               const on = clusterStatusFilter.has(s.k);
               return (

frontend/src/components/BandMap.tsx

@@ -358,6 +358,43 @@ export function BandMap({ band, spots, spotStatus, currentFreqHz, onSpotClick, o
     return () => el.removeEventListener('wheel', onWheel);
   }, [range]);
 
+  // Ctrl+↑ / Ctrl+↓ hop to the next spot above / below the rig frequency and tune
+  // to it. Higher freq is UP on the map (see freqToY), so ↑ = next higher spot.
+  // Only active on the docked Main-view map (keyNav) and ignored while typing.
+  // MUST stay ABOVE the `if (!range)` early return below: on an unknown band
+  // (e.g. a spurious 33 cm CAT reading from an Icom) that return skipped this
+  // hook, so the hook count changed between renders and React crashed with #300
+  // ("rendered fewer hooks than expected"). lo/hi are always defined (they fall
+  // back to [0,1] when there's no range), so it's safe to run here.
+  useEffect(() => {
+    if (!keyNav) return;
+    const onKey = (e: KeyboardEvent) => {
+      if (!e.ctrlKey || e.altKey || e.metaKey) return;
+      if (e.key !== 'ArrowUp' && e.key !== 'ArrowDown') return;
+      const ae = document.activeElement as HTMLElement | null;
+      const tag = (ae?.tagName || '').toLowerCase();
+      if (tag === 'input' || tag === 'textarea' || tag === 'select' || ae?.isContentEditable) return;
+      const list = spots
+        .filter((s) => (s.band ?? '') === band && s.freq_hz > 0)
+        .slice()
+        .sort((a, b) => a.freq_hz - b.freq_hz);
+      if (!list.length) return;
+      const cur = currentFreqHz || (lo + hi) * 500; // mid-band kHz→Hz when no rig freq
+      const EPS = 50; // Hz, so we don't re-pick the spot we're already sitting on
+      let target: Spot | undefined;
+      if (e.key === 'ArrowUp') {
+        target = list.find((s) => s.freq_hz > cur + EPS);
+      } else {
+        for (let i = list.length - 1; i >= 0; i--) { if (list[i].freq_hz < cur - EPS) { target = list[i]; break; } }
+      }
+      if (!target) return;
+      e.preventDefault();
+      onSpotClick(target);
+    };
+    window.addEventListener('keydown', onKey);
+    return () => window.removeEventListener('keydown', onKey);
+  }, [keyNav, spots, band, currentFreqHz, lo, hi, onSpotClick]);
+
   if (!range) {
     return (
       <div className="h-full w-full flex flex-col items-center justify-center text-xs text-muted-foreground p-3 bg-muted/20">
@@ -388,38 +425,6 @@ export function BandMap({ band, spots, spotStatus, currentFreqHz, onSpotClick, o
     scrollerRef.current.scrollTop = Math.max(0, y - containerH / 2);
   }
 
-  // Ctrl+↑ / Ctrl+↓ hop to the next spot above / below the rig frequency and tune
-  // to it. Higher freq is UP on the map (see freqToY), so ↑ = next higher spot.
-  // Only active on the docked Main-view map (keyNav) and ignored while typing.
-  useEffect(() => {
-    if (!keyNav) return;
-    const onKey = (e: KeyboardEvent) => {
-      if (!e.ctrlKey || e.altKey || e.metaKey) return;
-      if (e.key !== 'ArrowUp' && e.key !== 'ArrowDown') return;
-      const ae = document.activeElement as HTMLElement | null;
-      const tag = (ae?.tagName || '').toLowerCase();
-      if (tag === 'input' || tag === 'textarea' || tag === 'select' || ae?.isContentEditable) return;
-      const list = spots
-        .filter((s) => (s.band ?? '') === band && s.freq_hz > 0)
-        .slice()
-        .sort((a, b) => a.freq_hz - b.freq_hz);
-      if (!list.length) return;
-      const cur = currentFreqHz || (lo + hi) * 500; // mid-band kHz→Hz when no rig freq
-      const EPS = 50; // Hz, so we don't re-pick the spot we're already sitting on
-      let target: Spot | undefined;
-      if (e.key === 'ArrowUp') {
-        target = list.find((s) => s.freq_hz > cur + EPS);
-      } else {
-        for (let i = list.length - 1; i >= 0; i--) { if (list[i].freq_hz < cur - EPS) { target = list[i]; break; } }
-      }
-      if (!target) return;
-      e.preventDefault();
-      onSpotClick(target);
-    };
-    window.addEventListener('keydown', onKey);
-    return () => window.removeEventListener('keydown', onKey);
-  }, [keyNav, spots, band, currentFreqHz, lo, hi, onSpotClick]);
-
   const currentKHz = currentFreqHz ? currentFreqHz / 1000 : 0;
   const showRigPointer = currentKHz >= lo && currentKHz <= hi;
   const rigY = freqToY(currentKHz);

frontend/src/components/ClusterGrid.tsx

@@ -140,6 +140,19 @@ function statusColor(s: SpotStatusEntry | undefined): string | null {
   }
 }
 
+// isDull reports a spot that "represents nothing" under the current worked/slot
+// rules: the entity/band/mode is already worked (status resolved, not new in any
+// dimension), the callsign itself isn't in the log, and there's no POTA / county
+// / prefix novelty. Such rows are dimmed so the eye skips them. Because the
+// status obeys the DX-cluster "same slot" option and the digital-mode grouping,
+// what counts as dull follows those settings automatically. Unresolved statuses
+// (still loading, or entity unknown) are NOT dimmed — that would flicker.
+function isDull(s: SpotStatusEntry | undefined): boolean {
+  if (!s || !s.status) return false;
+  if (s.status === 'new' || s.status === 'new-band' || s.status === 'new-mode' || s.status === 'new-slot') return false;
+  return !(s.worked_call || s.new_pota || s.new_county || s.new_pfx);
+}
+
 const makeColCatalog = (t: TFn): ColEntry[] => [
   {
     group: 'Spot', label: t('clg2.c.time'),  colId: 'time',
@@ -410,7 +423,9 @@ export function ClusterGrid({ rows, spotStatus, onSpotClick }: Props) {
   // won't re-render those cells on its own — force a refresh so e.g. a worked call
   // turns blue once its status loads.
   useEffect(() => {
-    gridRef.current?.api?.refreshCells({ force: true });
+    // redrawRows (not refreshCells) so getRowStyle re-runs too — the whole-row
+    // dimming of "represents nothing" spots depends on the status that lands here.
+    gridRef.current?.api?.redrawRows();
   }, [spotStatus]);
 
   // Restore AFTER the profile scope is known — this grid has no key= remount to
@@ -496,6 +511,7 @@ export function ClusterGrid({ rows, spotStatus, onSpotClick }: Props) {
             onColumnVisible={saveColumnState}
             onSortChanged={saveColumnState}
             onRowClicked={handleRowClicked}
+            getRowStyle={(p: any) => (isDull(statusFor(p)) ? { opacity: 0.4 } : undefined)}
             animateRows={false}
             suppressCellFocus
             getRowId={(p) => `${(p.data as any).received_at}-${(p.data as any).dx_call}-${(p.data as any).source_id}`}

frontend/src/components/SettingsModal.tsx

@@ -1246,6 +1246,7 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
   const [startEqEnd, setStartEqEnd] = useState(() => localStorage.getItem('opslog.startEqualsEnd') === '1');
   const [lookupOnBlur, setLookupOnBlur] = useState(() => localStorage.getItem('opslog.lookupOnBlur') === '1');
   const [groupDigital, setGroupDigital] = useState(() => localStorage.getItem('opslog.groupDigitalSlots') === '1');
+  const [clusterWorkedSameSlot, setClusterWorkedSameSlot] = useState(() => localStorage.getItem('opslog.clusterWorkedSameSlot') === '1');
   const [showQsoRate, setShowQsoRate] = useState(() => localStorage.getItem('opslog.showQsoRate') === '1');
   const [catModeBeforeFreq, setCatModeBeforeFreq] = useState(() => localStorage.getItem('opslog.catModeBeforeFreq') === '1');
   // Password-encryption (secret vault) state.
@@ -4000,6 +4001,11 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
             <span className="font-mono">dx.maritimecontestclub.net:7300</span>,{' '}
             <span className="font-mono">w8avi.net:7300</span>.
           </p>
+          <label className="flex items-start gap-2 text-sm cursor-pointer border-t border-border/60 pt-3">
+            <Checkbox checked={clusterWorkedSameSlot} className="mt-0.5"
+              onCheckedChange={(c) => { const v = !!c; setClusterWorkedSameSlot(v); writeUiPref('opslog.clusterWorkedSameSlot', v ? '1' : '0'); }} />
+            <span>{t('clu.workedSameSlot')} <span className="text-xs text-muted-foreground">{t('clu.workedSameSlotHint')}</span></span>
+          </label>
         </div>
 
         {editingServer && (

frontend/src/lib/i18n.tsx

@@ -262,6 +262,8 @@ const en: Dict = {
   'clu.moveUp': 'Move up', 'clu.moveDown': 'Move down', 'clu.edit': 'Edit', 'clu.delete': 'Delete', 'clu.none': 'No cluster nodes saved yet.', 'clu.connect': 'Connect', 'clu.disconnect': 'Disconnect',
   'clu.add': 'Add cluster', 'clu.connectAll': 'Connect all', 'clu.disconnectAll': 'Disconnect all', 'clu.autoConnect': 'Auto-connect all enabled on app start',
   'clu.freeNodes': 'Free public nodes:',
+  'clu.workedSameSlot': 'Already worked only on the same slot',
+  'clu.workedSameSlotHint': '— a spot shows "worked" only if you worked that call on the SAME band and mode, not just anywhere. Combines with digital-mode grouping (Settings → General): with it on, a call worked on 20m FT8 also counts as worked for a 20m FT4 spot; with it off, FT8 and FT4 are separate slots.',
   // Backup panel
   'bk.hintMysql': 'On close (once/day) OpsLog snapshots the local SQLite (config) AND exports the shared MySQL log to ADIF — opslog-log-<date>.adi — so your contacts are protected even though they live on the server. Rotation keeps the last N of each.',
   'bk.hint': 'OpsLog can copy the SQLite database to a folder of your choice when you close it, once per day. Rotation keeps the last N copies and deletes older ones.',
@@ -672,6 +674,8 @@ const fr: Dict = {
   'clu.moveUp': 'Monter', 'clu.moveDown': 'Descendre', 'clu.edit': 'Éditer', 'clu.delete': 'Supprimer', 'clu.none': 'Aucun nœud cluster enregistré.', 'clu.connect': 'Connecter', 'clu.disconnect': 'Déconnecter',
   'clu.add': 'Ajouter cluster', 'clu.connectAll': 'Tout connecter', 'clu.disconnectAll': 'Tout déconnecter', 'clu.autoConnect': 'Connexion auto de tous les activés au démarrage',
   'clu.freeNodes': 'Nœuds publics gratuits :',
+  'clu.workedSameSlot': 'Déjà contacté seulement sur le même slot',
+  'clu.workedSameSlotHint': '— un spot n\'affiche « contacté » que si vous avez contacté cet indicatif sur la MÊME bande et le MÊME mode, pas juste n\'importe où. Se combine avec le groupage des modes numériques (Réglages → Général) : activé, un indicatif contacté en 20m FT8 compte aussi comme contacté pour un spot 20m FT4 ; désactivé, FT8 et FT4 sont des slots distincts.',
   'bk.hintMysql': "À la fermeture (1×/jour) OpsLog sauvegarde le SQLite local (config) ET exporte le log MySQL partagé en ADIF — opslog-log-<date>.adi — pour protéger tes contacts même s'ils sont sur le serveur. La rotation garde les N derniers de chaque.",
   'bk.hint': "OpsLog peut copier la base SQLite dans un dossier de ton choix à la fermeture, une fois par jour. La rotation garde les N dernières copies et supprime les plus anciennes.",
   'bk.auto': 'Sauvegarde auto à la fermeture d\'OpsLog (max 1×/jour)', 'bk.folder': 'Dossier de sauvegarde', 'bk.folderPh': 'vide = dossier par défaut', 'bk.browse': 'Parcourir…',

frontend/src/version.ts

@@ -1,6 +1,6 @@
 // Single source of truth for the app version shown in the UI (header + About).
 // Bump this on a release (the release script updates it alongside telemetry.go).
-export const APP_VERSION = '0.23.5';
+export const APP_VERSION = '0.23.6';
 
 // Author / credits, shown in Help -> About.
 export const APP_AUTHOR = 'F4BPO';

internal/dxcc/manager.go

@@ -197,7 +197,9 @@ func (m *Manager) PrefixByDXCC() map[int]string {
 		}
 		if n := EntityDXCC(e.Name); n > 0 {
 			if _, dup := out[n]; !dup {
-				out[n] = p
+				// DXCC prefixes are conventionally upper-case; cty.dat spells some
+				// sub-entity suffixes in lower case (3D2/c → 3D2/C).
+				out[n] = strings.ToUpper(p)
 			}
 		}
 	}

internal/qso/qso.go

@@ -2163,6 +2163,36 @@ func (r *Repo) WorkedCallBandModeKeys(ctx context.Context) (map[string]struct{},
 	return out, rows.Err()
 }
 
+// WorkedCallSlotKeys backs the cluster "already worked only on the same slot"
+// option. It returns each worked slot keyed BOTH as "CALL|band" (mode-agnostic,
+// for a spot whose mode couldn't be inferred) and "CALL|band|MODE" with the mode
+// run through normMode — so when digital grouping is on, FT8/FT4/RTTY fold into
+// one "DIG" and a call worked on 20m FT8 also matches a 20m FT4 spot. Call is
+// upper-cased and band lower-cased to match the spot keys ClusterSpotStatuses
+// builds. normMode may be nil (no grouping).
+func (r *Repo) WorkedCallSlotKeys(ctx context.Context, normMode func(string) string) (map[string]struct{}, error) {
+	rows, err := r.db.QueryContext(ctx,
+		`SELECT upper(callsign), lower(band), upper(mode) FROM qso
+		 WHERE callsign != '' AND band IS NOT NULL AND band != '' AND mode IS NOT NULL AND mode != ''`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	out := make(map[string]struct{}, 4096)
+	for rows.Next() {
+		var c, b, m string
+		if err := rows.Scan(&c, &b, &m); err != nil {
+			return nil, err
+		}
+		if normMode != nil {
+			m = normMode(m)
+		}
+		out[c+"|"+b] = struct{}{}
+		out[c+"|"+b+"|"+m] = struct{}{}
+	}
+	return out, rows.Err()
+}
+
 // WorkedPOTARefs returns the set of POTA park references already worked
 // (upper-cased). A QSO's pota_ref may hold several comma-separated parks
 // (an n-fer); each is added separately.

internal/ultrabeam/ultrabeam.go

@@ -509,7 +509,13 @@ func (c *Client) queryStatus() (*Status, error) {
 		return nil, err
 	}
 
-	if len(reply) < 12 {
+	// An older controller — seen behind an RS232-to-Ethernet bridge — answers with
+	// an 11-byte status frame: the standard one WITHOUT the trailing FreqMax byte.
+	// The packet checksum was already verified, so a short-but-valid frame is real,
+	// not a fragment. Accept it and default the missing tail fields instead of
+	// reconnect-looping on "reply too short". reply[9]/[10] (MotorsMoving, FreqMin)
+	// are the last we truly need, so 10 bytes is the floor.
+	if len(reply) < 10 {
 		return nil, fmt.Errorf("status reply too short: %d bytes", len(reply))
 	}
 
@@ -522,8 +528,12 @@ func (c *Client) queryStatus() (*Status, error) {
 		Direction:        int(reply[6] & 0x0F),
 		OffState:         (reply[7] & 0x02) != 0,
 		MotorsMoving:     int(reply[9]),
-		FreqMin:          int(reply[10]),
-		FreqMax:          int(reply[11]),
+	}
+	if len(reply) > 10 {
+		status.FreqMin = int(reply[10])
+	}
+	if len(reply) > 11 {
+		status.FreqMax = int(reply[11])
 	}
 
 	return status, nil

telemetry.go

@@ -21,7 +21,7 @@ import (
 
 const (
 	// appVersion is stamped on every heartbeat (and could feed the About box).
-	appVersion = "0.23.5"
+	appVersion = "0.23.6"
 
 	// posthogHost is the PostHog ingestion endpoint. EU cloud by default; change
 	// to https://us.i.posthog.com for a US project.