diff --git a/src/ria_toolkit_oss/orchestration/tx_executor.py b/src/ria_toolkit_oss/orchestration/tx_executor.py
index 6ae32b1..84e200b 100644
--- a/src/ria_toolkit_oss/orchestration/tx_executor.py
+++ b/src/ria_toolkit_oss/orchestration/tx_executor.py
@@ -37,6 +37,26 @@ from typing import Any
 
 logger = logging.getLogger(__name__)
 
+
+def _parse_hz(val: object) -> float:
+    """Parse a frequency value that may be a float (Hz) or a string like '2.45GHz'."""
+    if isinstance(val, (int, float)):
+        return float(val)
+    s = str(val).strip()
+    for suffix, mult in (("GHz", 1e9), ("MHz", 1e6), ("kHz", 1e3), ("Hz", 1.0)):
+        if s.endswith(suffix):
+            return float(s[: -len(suffix)]) * mult
+    return float(s)
+
+
+def _parse_seconds(val: object) -> float:
+    """Parse a duration value that may be a float (seconds) or a string like '5s'."""
+    if isinstance(val, (int, float)):
+        return float(val)
+    s = str(val).strip()
+    return float(s[:-1]) if s.endswith("s") else float(s)
+
+
 # Mapping from modulation name → (PSK/QAM order, generator_type)
 # 'psk' uses PSKGenerator, 'qam' uses QAMGenerator
 _MOD_TABLE: dict[str, tuple[int, str]] = {
@@ -83,7 +103,7 @@ class TxExecutor:
 
         modulation: str = agent_cfg.get("modulation", "QPSK").upper()
         symbol_rate: float = float(agent_cfg.get("symbol_rate", 1e6))
-        center_freq: float = float(agent_cfg.get("center_frequency", 0.0))
+        center_freq: float = _parse_hz(agent_cfg.get("center_frequency", 0.0))
         filter_type: str = agent_cfg.get("filter", "rrc").lower()
         rolloff: float = float(agent_cfg.get("rolloff", 0.35))
 
@@ -109,7 +129,7 @@ class TxExecutor:
         filter_type: str,
         rolloff: float,
     ) -> None:
-        duration: float = float(step.get("duration", 10.0))
+        duration: float = _parse_seconds(step.get("duration", 10.0))
         label: str = step.get("label", "step")
         gain: float = float(step.get("power_dbm") or 0.0)
         sample_rate = symbol_rate * sps