diff --git a/plugins/channelrx/demoddatv/leansdr/filtergen.h b/plugins/channelrx/demoddatv/leansdr/filtergen.h
index 8d6494e70..75d6de142 100644
--- a/plugins/channelrx/demoddatv/leansdr/filtergen.h
+++ b/plugins/channelrx/demoddatv/leansdr/filtergen.h
@@ -88,7 +88,7 @@ int lowpass(int order, float Fcut, T **coeffs, float gain = 1)
 // https://en.wikipedia.org/wiki/Root-raised-cosine_filter
 
 template <typename T>
-int root_raised_cosine(int order, float Fs, float rolloff, T **coeffs)
+int root_raised_cosine(int order, float Fs, float rolloff, T **coeffs, float gain=1)
 {
     float B = rolloff, pi = M_PI;
     int ncoeffs = (order + 1) | 1;
@@ -98,19 +98,18 @@ int root_raised_cosine(int order, float Fs, float rolloff, T **coeffs)
         int t = i - ncoeffs / 2;
         float c;
         if (t == 0)
-            c = sqrt(Fs) * (1 - B + 4 * B / pi);
+            c = (1 - B + 4*B/pi);
         else
         {
             float tT = t * Fs;
             float den = pi * tT * (1 - (4 * B * tT) * (4 * B * tT));
             if (!den)
-                c = B * sqrt(Fs / 2) * ((1 + 2 / pi) * sin(pi / (4 * B)) + (1 - 2 / pi) * cos(pi / (4 * B)));
+                c = B/sqrtf(2) * ( (1+2/pi)*sinf(pi/(4*B)) + (1-2/pi)*cosf(pi/(4*B)) );
             else
-                c = sqrt(Fs) * (sin(pi * tT * (1 - B)) + 4 * B * tT * cos(pi * tT * (1 + B))) / den;
+                c = ( sinf(pi*tT*(1-B)) + 4*B*tT*cosf(pi*tT*(1+B)) ) / den;
         }
-        (*coeffs)[i] = c;
+        (*coeffs)[i] = Fs * c * gain;
     }
-    normalize_dcgain(ncoeffs, *coeffs);
     return ncoeffs;
 }