diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 32264ad..ad19450 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -43,7 +43,7 @@ import {
   GetAwardDefs,
   GetUIPref, GetActiveProfile, QuitApp,
   ReportLiveActivity, LiveLastQSOAgeSec,
-  GetPGXLSettings, GetPGXLStatus, GetSPEStatus, GetACOMStatus,
+  GetPGXLSettings, GetPGXLStatus, GetSPEStatus, GetACOMStatus, SPESetOperate, ACOMSetOperate,
 } from '../wailsjs/go/main/App';
 import { Combobox } from '@/components/ui/combobox';
 import { applyAwardRefs } from '@/lib/awardRefs';
@@ -5145,7 +5145,9 @@ export default function App() {
               onClick={() => { setSettingsSection('rotator'); setShowSettings(true); }}
             />
             {/* Amplifier chip: green = OPERATE, orange = STANDBY, red = offline.
-                (PGXL has no standby notion here — green when connected.) */}
+                CLICK toggles OPERATE ↔ STANDBY (SPE/ACOM; optimistic flip, the 2s
+                poll reconciles). The PGXL has no standby command here — its chip
+                opens Settings instead, and shows green when connected. */}
             {ampCfg.enabled && (() => {
               const isPGXL = ampCfg.type === 'pgxl';
               const name = isPGXL ? 'PGXL'
@@ -5153,12 +5155,20 @@ export default function App() {
                 : `SPE ${ampSt.model || ''}`.trim();
               const dot = !ampSt.connected ? 'bg-danger' : (isPGXL || ampSt.operate) ? 'bg-success' : 'bg-warning';
               const state = !ampSt.connected ? (ampSt.last_error || 'offline') : (isPGXL ? (ampSt.state || 'connected') : ampSt.operate ? 'OPERATE' : 'STANDBY');
+              const toggle = () => {
+                if (isPGXL) { setSettingsSection('pgxl'); setShowSettings(true); return; }
+                const want = !ampSt.operate;
+                setAmpSt((s: any) => ({ ...s, operate: want }));
+                (ampCfg.type.startsWith('acom') ? ACOMSetOperate(want) : SPESetOperate(want)).catch(() => {});
+              };
               return (
                 <button
                   type="button"
-                  title={`${name}: ${state}`}
-                  onClick={() => { setSettingsSection('pgxl'); setShowSettings(true); }}
-                  className="inline-flex items-center gap-1.5 px-2 h-5 rounded border text-[11px] transition-colors border-border hover:bg-muted cursor-pointer"
+                  disabled={!isPGXL && !ampSt.connected}
+                  title={`${name}: ${state}${!isPGXL && ampSt.connected ? (ampSt.operate ? ' — click for STANDBY' : ' — click for OPERATE') : ''}`}
+                  onClick={toggle}
+                  className={cn('inline-flex items-center gap-1.5 px-2 h-5 rounded border text-[11px] transition-colors',
+                    (!isPGXL && !ampSt.connected) ? 'opacity-60 cursor-default border-border' : 'border-border hover:bg-muted cursor-pointer')}
                 >
                   <span className={cn('size-2 rounded-full', dot)} />
                   {name}