diff --git a/firmware/application/apps/ui_mictx.cpp b/firmware/application/apps/ui_mictx.cpp
index 68d98212..6b2169cf 100644
--- a/firmware/application/apps/ui_mictx.cpp
+++ b/firmware/application/apps/ui_mictx.cpp
@@ -30,6 +30,7 @@ using wolfson::wm8731::WM8731;
 
 #include "tonesets.hpp"
 #include "portapack_hal.hpp"
+#include "cpld_update.hpp"
 #include "string_format.hpp"
 #include "irq_controls.hpp"
 
@@ -178,6 +179,7 @@ void MicTXView::rxaudio(bool is_on) {
 		receiver_model.set_vga(rx_vga);
 		receiver_model.set_rf_amp(rx_amp);
 		receiver_model.enable();
+		hackrf::cpld::load_sram_no_verify();  // to have a good RX without any ghost inside Mic App
 		audio::output::start();
 	} else {	//These incredibly convoluted steps are required for the vumeter to reappear when stopping RX.
 		receiver_model.set_modulation(ReceiverModel::Mode::NarrowbandFMAudio); //This fixes something with AM RX...
@@ -549,6 +551,7 @@ MicTXView::~MicTXView() {
 	if (rx_enabled) //Also turn off audio rx if enabled
 		rxaudio(false);
 	baseband::shutdown();
+	hackrf::cpld::load_sram_no_verify();  //  too leave all RX ok, wihouth ghost signal problem at the exit .
 }
 
 }
diff --git a/firmware/common/cpld_update.cpp b/firmware/common/cpld_update.cpp
index 03964691..3055eb3d 100644
--- a/firmware/common/cpld_update.cpp
+++ b/firmware/common/cpld_update.cpp
@@ -114,6 +114,20 @@ bool load_sram() {
 	return ok;
 }
 
+void load_sram_no_verify() {
+	// CoolRunner II family has Hybrid memory CPLD arquitecture (SRAM+NVM) 
+	// It seems that after using TX App somehow , I do not why , the CPLD_SRAM part needs to be re_loaded to solve #637 ghost beat 
+    // load_sram() it is already called at each boot in portapack.cpp ,including verify CPLD part.
+	// Here we skipped CPLD verify part,just to be quicker (in case any CPLD problem it will be detected in the boot process).
+
+	auto jtag_target_hackrf_cpld = jtag_target_hackrf();
+	hackrf::one::cpld::CPLD hackrf_cpld { jtag_target_hackrf_cpld };
+
+ 	hackrf_cpld.write_sram(hackrf::one::cpld::verify_blocks);
+
+	return;
+}
+
 bool verify_eeprom() {
 	auto jtag_target_hackrf_cpld = jtag_target_hackrf();
 	hackrf::one::cpld::CPLD hackrf_cpld { jtag_target_hackrf_cpld };
diff --git a/firmware/common/cpld_update.hpp b/firmware/common/cpld_update.hpp
index 6799c708..36c87a1b 100644
--- a/firmware/common/cpld_update.hpp
+++ b/firmware/common/cpld_update.hpp
@@ -38,6 +38,7 @@ namespace hackrf {
 namespace cpld {
 
 bool load_sram();
+void load_sram_no_verify(); // added to solve issue #637 , "ghost" signal at RX , after using any TX App
 bool verify_eeprom();
 void init_from_eeprom();