Olivia Pre/Postamble visibility on waterfall

Changed pre/postamble sample block sizes to 512 for passing
    to ModulateXmtr.  This allows the waterfall FFT to faithfully
    reproduce the tones on the waterfall.  This change only effects
    the monitored signal and not the actual transmitted signal

src/olivia/olivia.cxx

@@ -89,7 +89,7 @@ void olivia::tx_init(SoundBase *sc)
 void olivia::send_preamble()
 {
 	double freqa, freqb;
-    int i, j, sr4 = samplerate / 4;
+    int i, j, sr4 = 8192 / 4;
     double ampshape[sr4];
     
     for (int i = 0; i < sr4; i++) ampshape[i] = 1.0;
@@ -112,13 +112,15 @@ void olivia::send_preamble()
 		outbuf[i] = nco(freqa) * ampshape[j];
 	for (i = 3*sr4, j = 0; i < samplerate; i++, j++)
 		outbuf[i] = nco(freqb) * ampshape[j];
-	ModulateXmtr(outbuf, samplerate);
+
+	for (j = 0; j < 8192; j += 512)
+		ModulateXmtr(&outbuf[j], 512);
 }
 
 void olivia::send_postamble()
 {
 	double freqa, freqb;
-	int i, j, sr4 = samplerate / 4;
+	int i, j, sr4 = 8192 / 4;
     double ampshape[sr4];
     
     for (int i = 0; i < sr4; i++) ampshape[i] = 1.0;
@@ -141,7 +143,9 @@ void olivia::send_postamble()
 		outbuf[i] = nco(freqa) * ampshape[j];
 	for (i = 3*sr4, j = 0; i < samplerate; i++, j++)
 		outbuf[i] = nco(freqb) * ampshape[j];
-	ModulateXmtr(outbuf, samplerate);
+
+	for (j = 0; j < 8192; j += 512)
+		ModulateXmtr(&outbuf[j], 512);
 }
 
 void olivia::rx_init()

src/trx/modem.cxx

@@ -395,6 +395,7 @@ void modem::ModulateXmtr(double *buffer, int len)
 		_mdm_scdbl[scptr] = buffer[i] * progdefaults.TxMonitorLevel;
 		scptr++;
 		if (scptr == 512) {
+//for (int i = 0; i < 512; i++) printf("%f\n", _mdm_scdbl[i]);
 			REQ(&waterfall::sig_data, wf, _mdm_scdbl.c_array(), 512, samplerate );
 			scptr = 0;
 			_mdm_scdbl.next(); // change buffers