diff --git a/monitor/src/adn_monitor/application/rts_update.py b/monitor/src/adn_monitor/application/rts_update.py
index 3fa0d81..ad0d84f 100644
--- a/monitor/src/adn_monitor/application/rts_update.py
+++ b/monitor/src/adn_monitor/application/rts_update.py
@@ -30,7 +30,7 @@
 from ..domain.peer_rf import (
     SIMPLEX_VOICE_SLOT,
     normalize_ua_voice_slot,
-    peer_downlink_display_slot,
+    peer_downlink_display_slots,
 )
 from ..domain.value_objects import ServerMode
 from .alias_service import AliasService
@@ -116,9 +116,9 @@ def _apply_voice_single_ts(
     _apply_multi_mode_chips(state, system, peer_id, peer_row)
 
 
-def _static_tg_slot_for_peer(peer_row: dict, destination: int, event_slot: int) -> int:
-    """Map wire timeslot to the peer chip that lists this TG in OPTIONS (TS1/TS2)."""
-    return peer_downlink_display_slot(peer_row, destination, event_slot)
+def _static_tg_slots_for_peer(peer_row: dict, destination: int, event_slot: int) -> list[int]:
+    """Chip slot(s) to update -- both, when this peer has the TG on TS1+TS2."""
+    return peer_downlink_display_slots(peer_row, destination, event_slot)
 
 
 def _is_master_peer_row(system: str) -> bool:
@@ -260,7 +260,7 @@ def _voice_event_target_peers(
     return targets
 
 
-def _peer_display_slot(
+def _peer_display_slots(
     peer_row: dict,
     peer_key,
     *,
@@ -269,20 +269,21 @@ def _peer_display_slot(
     event_slot: int,
     destination: int,
     trx: str = "",
-) -> int:
-    """Timeslot index for CTABLE peer chips (1 or 2)."""
+) -> list[int]:
+    """Timeslot index(es) for CTABLE peer chips -- usually one, both when this
+    peer has the TG on both static OPTIONS slots (see peer_downlink_display_slots)."""
     if _peer_keys_equal(source_peer, peer_key):
-        return event_slot
+        return [event_slot]
     if (
         call_type == "GROUP VOICE"
         and trx == "TX"
         and _is_echo_service_live_tgid(destination)
     ):
         # Echo/service downlink (bridge TX leg): use wire slot, not OPTIONS static map.
-        return event_slot
+        return [event_slot]
     if call_type == "GROUP VOICE":
-        return _static_tg_slot_for_peer(peer_row, destination, event_slot)
-    return event_slot
+        return _static_tg_slots_for_peer(peer_row, destination, event_slot)
+    return [event_slot]
 
 
 def rts_update_impl(
@@ -375,7 +376,7 @@ def rts_update_impl(
             destination=destination,
             dest_peer_id=dest_peer_id,
         ):
-            display_slot = _peer_display_slot(
+            display_slots = _peer_display_slots(
                 peer_row,
                 peer,
                 call_type=call_type,
@@ -385,41 +386,42 @@ def rts_update_impl(
                 trx=trx,
             )
             crxstatus = "RX" if _peer_keys_equal(source_peer, peer) else "TX"
-            peer_ts = peer_row[display_slot]
-            if action == "START":
-                if (
-                    peer_ts.get("TS")
-                    and not _is_echo_service_live_tgid(destination)
-                    and _peer_slot_busy_other_tg(peer_ts, destination)
-                ):
-                    continue
-                # Local PTT (TRX=RX / red): do not replace with another peer's downlink (TRX=TX / green).
-                if (
-                    peer_ts.get("TS")
-                    and peer_ts.get("TRX") == "RX"
-                    and not _peer_keys_equal(source_peer, peer)
-                    and not _is_echo_service_live_tgid(destination)
-                ):
-                    continue
-                peer_ts["TIMEOUT"] = timeout
-                peer_ts["TS"] = True
-                peer_ts["TYPE"] = call_type
-                peer_ts["SUB"] = f"{sub_short} ({source_sub})"
-                peer_ts["CALL"] = sub_call
-                peer_ts["SRC"] = peer
-                peer_ts["DEST"] = tg_dest
-                peer_ts["TG"] = tg_short
-                peer_ts["TRX"] = crxstatus
-                peer_ts["ANNOUNCEMENT"] = is_announcement
-            elif action == "END":
-                if (
-                    trx == "TX"
-                    and peer_ts.get("TS")
-                    and not _is_echo_service_live_tgid(destination)
-                    and _peer_slot_busy_other_tg(peer_ts, destination)
-                ):
-                    continue
-                clear_voice_ts_for_destination(peer_row, destination)
+            for display_slot in display_slots:
+                peer_ts = peer_row[display_slot]
+                if action == "START":
+                    if (
+                        peer_ts.get("TS")
+                        and not _is_echo_service_live_tgid(destination)
+                        and _peer_slot_busy_other_tg(peer_ts, destination)
+                    ):
+                        continue
+                    # Local PTT (TRX=RX / red): do not replace with another peer's downlink (TRX=TX / green).
+                    if (
+                        peer_ts.get("TS")
+                        and peer_ts.get("TRX") == "RX"
+                        and not _peer_keys_equal(source_peer, peer)
+                        and not _is_echo_service_live_tgid(destination)
+                    ):
+                        continue
+                    peer_ts["TIMEOUT"] = timeout
+                    peer_ts["TS"] = True
+                    peer_ts["TYPE"] = call_type
+                    peer_ts["SUB"] = f"{sub_short} ({source_sub})"
+                    peer_ts["CALL"] = sub_call
+                    peer_ts["SRC"] = peer
+                    peer_ts["DEST"] = tg_dest
+                    peer_ts["TG"] = tg_short
+                    peer_ts["TRX"] = crxstatus
+                    peer_ts["ANNOUNCEMENT"] = is_announcement
+                elif action == "END":
+                    if (
+                        trx == "TX"
+                        and peer_ts.get("TS")
+                        and not _is_echo_service_live_tgid(destination)
+                        and _peer_slot_busy_other_tg(peer_ts, destination)
+                    ):
+                        continue
+                    clear_voice_ts_for_destination(peer_row, destination)
 
     server_mode = getattr(state, "server_mode", ServerMode.LEGACY)
     if system in ctable.get("OPENBRIDGES", {}):
diff --git a/monitor/src/adn_monitor/domain/peer_rf.py b/monitor/src/adn_monitor/domain/peer_rf.py
index 4e5901f..d7a0be0 100644
--- a/monitor/src/adn_monitor/domain/peer_rf.py
+++ b/monitor/src/adn_monitor/domain/peer_rf.py
@@ -90,10 +90,37 @@ def peer_downlink_display_slot(
     ts2 = [str(x).strip() for x in (peer_row.get("TS2_STATIC") or []) if str(x).strip()]
     in_ts1 = tg in ts1
     in_ts2 = tg in ts2
+    if in_ts1 and in_ts2:
+        # TG duplicated on both static slots: each downlink event carries its
+        # own real wire slot (server now delivers both independently), so the
+        # chip must follow event_slot -- collapsing to SIMPLEX_VOICE_SLOT here
+        # would make the TS1 delivery overwrite the same chip as TS2.
+        return event_slot
     if peer_is_simplex(peer_row) and (in_ts1 or in_ts2):
         return SIMPLEX_VOICE_SLOT
-    if in_ts1 and not in_ts2:
+    if in_ts1:
         return 1
-    if in_ts2 and not in_ts1:
+    if in_ts2:
         return 2
     return event_slot
+
+
+def peer_downlink_display_slots(
+    peer_row: dict[str, Any],
+    destination: int,
+    event_slot: int,
+) -> list[int]:
+    """CTABLE chip slot(s) to update for one downlink event to this peer.
+
+    Normally a single slot (see ``peer_downlink_display_slot``). When the TG
+    is duplicated on both static OPTIONS slots, adn-server's
+    ``iter_downlink_voice_slots`` delivers to this peer independently on
+    TS1 *and* TS2 from the one incoming event -- both chips must reflect
+    that, not just whichever slot the source happened to transmit on.
+    """
+    tg = str(destination)
+    ts1 = [str(x).strip() for x in (peer_row.get("TS1_STATIC") or []) if str(x).strip()]
+    ts2 = [str(x).strip() for x in (peer_row.get("TS2_STATIC") or []) if str(x).strip()]
+    if tg in ts1 and tg in ts2:
+        return [1, 2]
+    return [peer_downlink_display_slot(peer_row, destination, event_slot)]
diff --git a/monitor/tests/domain/test_peer_rf.py b/monitor/tests/domain/test_peer_rf.py
index 24fc649..b293c50 100644
--- a/monitor/tests/domain/test_peer_rf.py
+++ b/monitor/tests/domain/test_peer_rf.py
@@ -28,3 +28,17 @@ def test_normalize_ua_voice_slot_simplex_uses_ts2():
 def test_peer_downlink_display_slot_simplex_static_on_ts2():
     peer = {"RF_MODE": "simplex", "TS1_STATIC": ["730"], "TS2_STATIC": []}
     assert peer_downlink_display_slot(peer, 730, 1) == 2
+
+
+def test_peer_downlink_display_slot_tg_on_both_static_slots_follows_event_slot():
+    """Duplex-capable hotspot with the same TG on TS1+TS2: each downlink event
+    (server now delivers both independently) must chip its own real slot, not
+    collapse onto SIMPLEX_VOICE_SLOT -- else the TS2 delivery overwrites the
+    TS1 chip and the UI only ever shows one slot active."""
+    peer = {"RF_MODE": "duplex", "TS1_STATIC": ["730"], "TS2_STATIC": ["730"]}
+    assert peer_downlink_display_slot(peer, 730, 1) == 1
+    assert peer_downlink_display_slot(peer, 730, 2) == 2
+
+    peer_simplex = {"RF_MODE": "simplex", "TS1_STATIC": ["730"], "TS2_STATIC": ["730"]}
+    assert peer_downlink_display_slot(peer_simplex, 730, 1) == 1
+    assert peer_downlink_display_slot(peer_simplex, 730, 2) == 2
diff --git a/monitor/tests/test_rts_display_slot.py b/monitor/tests/test_rts_display_slot.py
index d85a789..ebb10a5 100644
--- a/monitor/tests/test_rts_display_slot.py
+++ b/monitor/tests/test_rts_display_slot.py
@@ -94,6 +94,24 @@ def test_wire_ts2_colors_ts1_when_tg_only_in_ts1_static() -> None:
     assert peer[2]["TS"] is False
 
 
+def test_tg_on_both_static_slots_lights_up_both_chips() -> None:
+    """Duplex hotspot with the TG on TS1+TS2: adn-server delivers to it on
+    both slots independently (e.g. an OBP-sourced call, always reported on
+    slot 1) -- both chips must light up, not just the event's own slot."""
+    state = _state_with_peer(peer_id=730001, ts1_static=["730"], ts2_static=["730"])
+    rts_update_impl(
+        "GROUP VOICE,START,TX,SYSTEM,1,730002,730002,1,730".split(","),
+        state,
+        _alias(),
+        lambda: "12:00",
+    )
+    peer = state.CTABLE["MASTERS"]["SYSTEM"]["PEERS"][730001]
+    assert peer[1]["TS"] is True
+    assert peer[1]["TRX"] == "TX"
+    assert peer[2]["TS"] is True
+    assert peer[2]["TRX"] == "TX"
+
+
 def test_transmitter_rx_uses_wire_slot_not_options() -> None:
     state = _state_with_peer(peer_id=730002, ts1_static=[], ts2_static=["73010"])
     rts_update_impl(