diff --git a/Microphone-Transceiver.md b/Microphone-Transceiver.md
index a6c7cfa..625ea72 100644
--- a/Microphone-Transceiver.md
+++ b/Microphone-Transceiver.md
@@ -175,7 +175,7 @@ Once is marked , we have a common same frequency (F = F_TX) and therefore, to no
 
 * **AMP:** RX LNA pre-amplifer  0=0dB or 1=14dB.
 
-* **TX-IQ-CAL:** TX I/Q channel phase calibration, range (+4º ...-4º). Specially usefull to optimize the SSB (USB-LSB) or DSB-SC , Suppressed carrier . 
+* **TX-IQ-CAL:** TX I/Q channel phase calibration, to adjust the imbalance IQ modulator phase error. The adjustment range is (+4º ...-4º). Specially usefull to optimize the SSB (USB-LSB) or DSB-SC , Suppressed carrier . 
 In Hackrf versions r1 to r8 , we are using max2837 , that has a calibration register settings of 5 bits , in Hackrf r9 , we are using max2839, that has 6 bits to cover the same range (+4º,..., -4º phase adj).
 
 As example , see the attenuation of the residual SSB carrier effect, when adjusting that IQ Phase calibration value in an H1R1 with max2837,