audio fixes attempt

drb-frontend/components/NodeConfigModal.tsx

@@ -10,18 +10,29 @@ interface Props {
   onClose: () => void;
 }
 
+const PRESETS = [
+  { value: "rtl-sdr-v3",     label: "RTL-SDR v3",      hint: "TCXO — LNA:34, tracking off" },
+  { value: "nesdr-smart-v4", label: "NESDR Smart v4",   hint: "TCXO — LNA:32, tracking off" },
+  { value: "other",          label: "Other",             hint: "LNA:32, tracking on" },
+];
+
 export function NodeConfigModal({ node, systems, onClose }: Props) {
   const [systemId, setSystemId] = useState("");
+  const [preset, setPreset] = useState("rtl-sdr-v3");
+  const [ppm, setPpm] = useState("0");
   const [saving, setSaving] = useState(false);
   const [error, setError] = useState<string | null>(null);
 
+  const ppmVal = parseFloat(ppm);
+  const ppmOverride = !isNaN(ppmVal) && ppmVal !== 0 ? ppmVal : undefined;
+
   async function handleSubmit(e: React.FormEvent) {
     e.preventDefault();
     if (!systemId) return;
     setSaving(true);
     setError(null);
     try {
-      await c2api.assignSystem(node.node_id, systemId);
+      await c2api.assignSystem(node.node_id, systemId, preset, ppmOverride);
       onClose();
     } catch (err) {
       setError(err instanceof Error ? err.message : "Failed to assign system.");
@@ -30,6 +41,8 @@ export function NodeConfigModal({ node, systems, onClose }: Props) {
     }
   }
 
+  const selectedPreset = PRESETS.find((p) => p.value === preset);
+
   return (
     <div className="fixed inset-0 bg-black/70 flex items-center justify-center z-50">
       <div className="bg-gray-900 border border-gray-700 rounded-xl p-6 w-full max-w-md font-mono">
@@ -57,6 +70,36 @@ export function NodeConfigModal({ node, systems, onClose }: Props) {
             </select>
           </div>
 
+          <div>
+            <label className="block text-xs text-gray-400 mb-1">SDR Hardware</label>
+            <select
+              value={preset}
+              onChange={(e) => setPreset(e.target.value)}
+              className="w-full bg-gray-800 border border-gray-700 rounded-lg px-3 py-2 text-white text-sm focus:outline-none focus:border-indigo-500"
+            >
+              {PRESETS.map((p) => (
+                <option key={p.value} value={p.value}>{p.label}</option>
+              ))}
+            </select>
+            {selectedPreset && (
+              <p className="text-xs text-gray-600 mt-1">{selectedPreset.hint}</p>
+            )}
+          </div>
+
+          <div>
+            <label className="block text-xs text-gray-400 mb-1">
+              PPM offset <span className="text-gray-600">(0 = use preset default; calibrate via OP25 web UI)</span>
+            </label>
+            <input
+              type="number"
+              value={ppm}
+              onChange={(e) => setPpm(e.target.value)}
+              step="0.1"
+              className="w-full bg-gray-800 border border-gray-700 rounded-lg px-3 py-2 text-white text-sm font-mono focus:outline-none focus:border-indigo-500"
+              placeholder="0"
+            />
+          </div>
+
           {error && <p className="text-red-400 text-xs">{error}</p>}
 
           <div className="flex gap-3 pt-1">

drb-frontend/lib/c2api.ts

@@ -25,8 +25,11 @@ export const c2api = {
   getNode: (id: string) => request<unknown>(`/nodes/${id}`),
   sendCommand: (nodeId: string, payload: object) =>
     request(`/nodes/${nodeId}/command`, { method: "POST", body: JSON.stringify(payload) }),
-  assignSystem: (nodeId: string, systemId: string) =>
-    request(`/nodes/${nodeId}/config/${systemId}`, { method: "POST" }),
+  assignSystem: (nodeId: string, systemId: string, hardwarePreset: string, ppmOverride?: number) => {
+    const params = new URLSearchParams({ hardware_preset: hardwarePreset });
+    if (ppmOverride !== undefined) params.set("ppm_override", String(ppmOverride));
+    return request(`/nodes/${nodeId}/config/${systemId}?${params}`, { method: "POST" });
+  },
 
   // Systems
   getSystems: () => request<unknown[]>("/systems"),

drb-frontend/lib/types.ts

@@ -11,6 +11,8 @@ export interface NodeRecord {
   last_seen: string | null;
   assigned_system_id: string | null;
   approval_status: ApprovalStatus | null;
+  hardware_preset?: string;
+  ppm_override?: number | null;
 }
 
 export interface VocabularyPendingTerm {