diff --git a/examples/companion_radio/MyMesh.cpp b/examples/companion_radio/MyMesh.cpp
index 71857417d..4da8506ec 100644
--- a/examples/companion_radio/MyMesh.cpp
+++ b/examples/companion_radio/MyMesh.cpp
@@ -9544,7 +9544,8 @@ bool MyMesh::handleCommand(const char* command, uint32_t sender_timestamp,
         }
       }
     }
-    if (!strcmp(command, "get radio")) _radio_profiles.appendSavedPreamble(reply, reply_capacity, _prefs.sf, _prefs.bw);
+    // Keep get radio as the upstream four-field tuple. Apps parse this CSV
+    // directly; preamble and timing diagnostics have separate commands.
     if (!strncmp(command, "set radio ", 10) && !strncmp(reply, "OK", 2))
       _radio_profiles.appendPrimaryChirpWarning(reply, reply_capacity, _prefs.sf, _prefs.bw,
                                                _radio_profiles.primaryPreamble());
diff --git a/scripts/check_nrf52_ble_reconnect.py b/scripts/check_nrf52_ble_reconnect.py
index 0d07b7759..015a2d617 100644
--- a/scripts/check_nrf52_ble_reconnect.py
+++ b/scripts/check_nrf52_ble_reconnect.py
@@ -102,6 +102,12 @@ async def check_commands(client, args):
             raise RuntimeError("Unexpected firmware: " + reply)
         if "Unknown command" in reply or "Not Supported" in reply:
             raise RuntimeError(reply)
+        if cmd == "get radio":
+            fields = reply.removeprefix("> ").split(",")
+            if len(fields) != 4:
+                raise RuntimeError("Radio reply must have exactly four upstream fields: " + reply)
+            # Reject annotations as well as extra CSV fields.
+            float(fields[0]); float(fields[1]); int(fields[2]); int(fields[3])
         report("app_cli", command=cmd, trailing_nul=True, reply=reply)
 
 
diff --git a/src/helpers/TxtDataHelpers.cpp b/src/helpers/TxtDataHelpers.cpp
index 955754601..5928cc01f 100644
--- a/src/helpers/TxtDataHelpers.cpp
+++ b/src/helpers/TxtDataHelpers.cpp
@@ -109,7 +109,8 @@ static void _ftoa(float f, char *p, int *status)
   else if (exp2 >= 0) 
   {
     int_part = mantissa>>(23 - exp2);
-    frac_part = (mantissa<<(exp2 + 1))&0xFFFFFF;
+    // Only the low 24 bits are needed; shift unsigned to avoid signed overflow.
+    frac_part = (uint32_t(mantissa)<<(exp2 + 1))&0xFFFFFF;
   } 
   else 
   {
diff --git a/test/test_companion_primary_radio_persistence.py b/test/test_companion_primary_radio_persistence.py
index 35698c1ad..809668eb1 100644
--- a/test/test_companion_primary_radio_persistence.py
+++ b/test/test_companion_primary_radio_persistence.py
@@ -15,6 +15,7 @@ ROOT = Path(__file__).resolve().parents[1]
 
 HARNESS = r'''
 #include <helpers/RadioProfileCLI.h>
+#include <helpers/TxtDataHelpers.h>
 #include <helpers/radiolib/RXPowerSaving.h>
 #include <limits>
 #define constrain(value,low,high) ((value)<(low)?(low):((value)>(high)?(high):(value)))
@@ -88,16 +89,32 @@ struct MyMesh {
 // CommonCLI's infrastructure roles share the same accepted duty-cycle range.
 // Extract their actual setter and boot sanitization, with only storage mocked.
 struct Infrastructure {
-  struct Prefs { float airtime_factor=1; } prefs;
+  struct Prefs { float airtime_factor=1,freq=909.5f,bw=62.5f;uint8_t sf=7,cr=5; } prefs;
   Prefs* _prefs=&prefs;
   uint8_t image[sizeof(float)]={};
   void savePrefs() { memcpy(image,&prefs.airtime_factor,sizeof(float)); }
   void command(const char* config,char* reply) { @INFRA_SETTER@ }
+  void radioCommand(char* reply) { @INFRA_RADIO@ }
   void reboot() { memcpy(&prefs.airtime_factor,image,sizeof(float));@INFRA_SANITIZE@ }
 };
 static bool error(const char* reply) { return strstr(reply,"Error") || strstr(reply,"ERROR"); }
 int main() {
   unsigned checks=0;
+  // App radio settings require exactly the upstream four-field CSV, even
+  // with an explicit preamble or an active temporary/secondary profile.
+  for(uint32_t timestamp:{0U,1700000000U})for(uint16_t preamble:{0U,48U}) {
+    MyMesh m;assert(m._radio_profiles.savePrimaryPreamble(preamble));
+    m.radio.p.primary.freq=915;m.radio.p.primary.preamble=96;
+    m.radio.p.primary_temporary=true;
+    m.radio.p.secondary.params={916,125,64,8,6};
+    m.radio.p.secondary.mode=mesh::RadioProfileMode::RxTx;
+    const char* reply=m.command("get radio",timestamp);
+    assert(!strcmp(reply,"> 909.5,62.5,7,5"));
+    assert(m._radio_profiles.primaryPreamble()==preamble);
+    Infrastructure infra;char infrastructure_reply[160]={};
+    infra.radioCommand(infrastructure_reply);
+    assert(!strcmp(infrastructure_reply,reply));++checks;
+  }
   // The outer profile validator accepts 125.005, but CommonRadioPrefs rejects
   // it. Rejection must preserve both on-disk images, even with a dirty adapter.
   for(uint32_t timestamp:{0U,1700000000U})for(bool dirty:{false,true}) {
@@ -199,6 +216,7 @@ class CompanionPrimaryRadioPersistenceTests(unittest.TestCase):
             '@COMPANION_SANITIZE@': boot_checks(companion, '_prefs.airtime_factor'),
             '@INFRA_SANITIZE@': boot_checks(infra, '_prefs->airtime_factor'),
             '@INFRA_SETTER@': extract_braced(infra, 'if (memcmp(config, "dutycycle ", 10) == 0)'),
+            '@INFRA_RADIO@': extract_braced(infra, 'if (configKeyEquals(config, "radio"))').split('{', 1)[1].rsplit('}', 1)[0],
         }
         harness = support + HARNESS
         for marker, value in replacements.items():