diff --git a/radio/src/pulses/pxx2.cpp b/radio/src/pulses/pxx2.cpp
index a72520b17..9e4826cc9 100644
--- a/radio/src/pulses/pxx2.cpp
+++ b/radio/src/pulses/pxx2.cpp
@@ -98,23 +98,23 @@ bool Pxx2Pulses::setupSpectrumAnalyser(uint8_t module)
   addFrameType(PXX2_TYPE_C_POWER_METER, PXX2_TYPE_ID_SPECTRUM);
   Pxx2Transport::addByte(0x00);
 
-  uint32_t fq = 2500000000;
+  uint32_t fq = 2440000000;  // 2440MHz
   Pxx2Transport::addByte(fq);
   Pxx2Transport::addByte(fq >> 8);
   Pxx2Transport::addByte(fq >> 16);
   Pxx2Transport::addByte(fq >> 24);
 
-  uint32_t span = 10000;
+  uint32_t span = 40000000;  // 40MHz
   Pxx2Transport::addByte(span);
   Pxx2Transport::addByte(span >> 8);
   Pxx2Transport::addByte(span >> 16);
   Pxx2Transport::addByte(span >> 24);
 
-  uint32_t bandwidth = 10000;
-  Pxx2Transport::addByte(bandwidth);
-  Pxx2Transport::addByte(bandwidth >> 8);
-  Pxx2Transport::addByte(bandwidth >> 16);
-  Pxx2Transport::addByte(bandwidth >> 24);
+  uint32_t step = 100000;  // 100KHz
+  Pxx2Transport::addByte(step);
+  Pxx2Transport::addByte(step >> 8);
+  Pxx2Transport::addByte(step >> 16);
+  Pxx2Transport::addByte(step >> 24);
 
   static bool done = false;
 
@@ -125,7 +125,6 @@ bool Pxx2Pulses::setupSpectrumAnalyser(uint8_t module)
   return true;
 }
 
-
 bool Pxx2Pulses::setupFrame(uint8_t module)
 {
   initFrame();
diff --git a/radio/src/telemetry/telemetry.cpp b/radio/src/telemetry/telemetry.cpp
index c6d6ea80a..e1a44a298 100644
--- a/radio/src/telemetry/telemetry.cpp
+++ b/radio/src/telemetry/telemetry.cpp
@@ -139,11 +139,17 @@ void processSpectrumFrame(uint8_t module, uint8_t * frame)
   uint32_t * frequency = (uint32_t *)&frame[4];
   int8_t * power = (int8_t *)&frame[8];
 
-  // center = 2500000000
-  // left = 2500000000 - 5000
-  // span = 10000
+  // center = 2440000000;  // 2440MHz
+  // span = 40000000;  // 40MHz
+  // left = 2440000000 - 20000000
+  // step = 10000
 
-  // reusableBuffer.spectrum.bars[(*frequency - (2500000000 - 5000)) * 128 / 10000] = 127 + *power;
+  int32_t D = *frequency - (2440000000 - 40000000 / 2);
+
+  // TRACE("Fq=%u, Pw=%d, X=%d, Y=%d", *frequency, int32_t(*power), D * 128 / 40000000, int32_t(127 + *power));
+  uint8_t x = D * 128 / 40000000;
+
+  reusableBuffer.spectrum.bars[x] = 127 + *power;
 }
 
 void processRadioFrame(uint8_t module, uint8_t * frame)