Removed "smooth scaling" of TX IQ samples for HermesLite2 since this

is not compatible with PURESIGNAL.

diff --git a/transmitter.c b/transmitter.c
index 5feb5c7217b6aa7c7f312c0a2e10d082064545bd..c3a2b76be222319c217a6c50132ff4c5b1f565f7 100644 (file)
--- a/transmitter.c
+++ b/transmitter.c
@@ -1248,40 +1248,6 @@ static void full_tx_buffer(TRANSMITTER *tx) {
         gain=gain*(double)tx->drive_level*0.00392;
       }
     }
-    if (protocol == ORIGINAL_PROTOCOL && radio->device == DEVICE_HERMES_LITE2 && !transmitter->puresignal) {
-      //
-      // The HermesLite2 is built around the AD9866 modem chip. The TX level can
-      // be adjusted from 0.0 to -7.5 dB in 0.5 db steps, and these settings are
-      // encoded in the top 4 bits of the HPSDR "drive level".
-      //
-      // In old_protocol.c, the TX attenuator is set according to the drive level,
-      // here we only apply a (mostly small) additional damping of the IQ samples
-      // to achieve a smooth drive level adjustment.
-      // However, if the drive level requires an attenuation *much* larger than
-      // 7.5 dB we have to damp significantly at this place, which may affect IMD.
-      //
-      // NOTE: When doing adaptive pre-distortion (PURESIGNAL), IQ scaling cannot
-      //       be used because the the TX ADC samples reported back also never
-      //       reach their "SetPK" amplitude and PURESIGNAL does not jump in
-      //
-      int power;
-      double f,g;
-      if(tune && !tx->tune_use_drive) {
-        f=sqrt((double)tx->tune_percent * 0.01);
-        power=(int)((double)tx->drive_level*f);
-      } else {
-        power=tx->drive_level;
-      }
-      g=-15.0;
-      if (power > 0) {
-        f = 40.0 * log10((double) power / 255.0);   // 2* attenuation in dB
-        g= ceil(f);                                 // 2* attenuation rounded to half-dB steps
-        if (g < -15.0) g=-15.0;                     // nominal TX attenuation
-        gain=gain*pow(10.0,0.05*(f-g));
-      } else {
-        gain=0.0;
-      }
-    }
 
     if (txflag == 0 && protocol == NEW_PROTOCOL) {
        //