diff --git a/ft8/ft4.cpp b/ft8/ft4.cpp
index 9d42da3d6..5270aa254 100644
--- a/ft8/ft4.cpp
+++ b/ft8/ft4.cpp
@@ -2913,7 +2913,7 @@ float FT4::guess_snr(const FFTEngine::ffts_t &m103)
         raw = 0.1;
     }
 
-    raw /= (2500.0 / 2.7); // 2.7 hz noise b/w -> 2500 hz b/w
+    raw /= (2500.0 / 12.0); // 9.0 hz noise b/w -> 2500 hz b/w (FT4: 3.33x wider than FT8's 2.7 Hz) + adjust
     float snr = 10 * log10(raw);
     snr += 5;
     snr *= 1.4;
diff --git a/sdrbench/test_ft4.cpp b/sdrbench/test_ft4.cpp
index 90ba74922..b61563b04 100644
--- a/sdrbench/test_ft4.cpp
+++ b/sdrbench/test_ft4.cpp
@@ -246,15 +246,19 @@ void MainBench::testFT4(const QString& wavFile, const QString& argsStr)
         qDebug("MainBench::testFT4: %s", qPrintable(QString::fromStdString(msg.first)));
     }
 
-    if (msgMap.size() != 2)
+    if (msgMap.size() != 6)
     {
-        qDebug("MainBench::testFT4: failed: invalid size: %lu expected 2", msgMap.size());
+        qDebug("MainBench::testFT4: failed: invalid size: %lu expected 6", msgMap.size());
         return;
     }
 
     QStringList messages = {
+        "AO5SQ EA3HKA JN11",
+        "CQ LA1PHA JP76",
+        "CQ PA8DC JO21",
         "CQ R3YBG KO73",
-        "CQ YU7ZZ KN05"
+        "CQ YU7ZZ KN05",
+        "W4WWQ 9A6T -11"
     };
 
     for (const auto &msg : messages)