diff --git a/openrtx/include/calibration/calibUtils.h b/openrtx/include/calibration/calibUtils.h
index 1e746ef1..c3ac5f0d 100644
--- a/openrtx/include/calibration/calibUtils.h
+++ b/openrtx/include/calibration/calibUtils.h
@@ -39,7 +39,7 @@
  * and frequencies.
  * @return value for the calibration parameter at the given frequency point.
  */
-uint8_t interpCalParameter(freq_t freq, freq_t *calPoints, uint8_t *param,
-                                                           uint8_t elems);
+uint8_t interpCalParameter(const freq_t freq, const freq_t *calPoints,
+                           const uint8_t *param, const uint8_t elems);
 
 #endif /* CALIB_UTILS_H */
diff --git a/openrtx/src/calibUtils.c b/openrtx/src/calibUtils.c
index f9ce2083..7cf29dff 100644
--- a/openrtx/src/calibUtils.c
+++ b/openrtx/src/calibUtils.c
@@ -19,8 +19,8 @@
 
 #include <calibUtils.h>
 
-uint8_t interpCalParameter(freq_t freq, freq_t *calPoints, uint8_t *param,
-                                                           uint8_t elems)
+uint8_t interpCalParameter(const freq_t freq, const freq_t *calPoints,
+                           const uint8_t *param, const uint8_t elems)
 {
 
     if(freq <= calPoints[0])         return param[0];
diff --git a/platform/drivers/NVM/nvmem_MD3x0.c b/platform/drivers/NVM/nvmem_MD3x0.c
index 308f5f7f..e5793608 100644
--- a/platform/drivers/NVM/nvmem_MD3x0.c
+++ b/platform/drivers/NVM/nvmem_MD3x0.c
@@ -179,10 +179,15 @@ void nvm_readCalibData(void *buf)
     (void) extFlash_readSecurityRegister(0x20b0, ((uint8_t *) &freqs), 72);
     extFlash_sleep();
 
+    /*
+     * Ugly quirk: frequency stored in calibration data is divided by ten, so,
+     * after bcd2bin conversion we have something like 40'135'000. To ajdust
+     * things, frequency has to be multiplied by ten.
+     */
     for(uint8_t i = 0; i < 9; i++)
     {
-        calib->rxFreq[i] = ((freq_t) _bcd2bin(freqs[2*i]));
-        calib->txFreq[i] = ((freq_t) _bcd2bin(freqs[2*i+1]));
+        calib->rxFreq[i] = ((freq_t) _bcd2bin(freqs[2*i])) * 10;
+        calib->txFreq[i] = ((freq_t) _bcd2bin(freqs[2*i+1])) * 10;
     }
 }