diff --git a/firmware/application/apps/ais_app.cpp b/firmware/application/apps/ais_app.cpp
index 0155f5e7..ee7527c3 100644
--- a/firmware/application/apps/ais_app.cpp
+++ b/firmware/application/apps/ais_app.cpp
@@ -307,8 +307,13 @@ AISAppView::AISAppView(NavigationView& nav) : nav_ { nav } {
 	recent_entry_detail_view.hidden(true);
 
 	target_frequency_ = initial_target_frequency;
+  
+    receiver_model.set_tuning_frequency(tuning_frequency());
+    receiver_model.set_sampling_rate(sampling_rate);
+    receiver_model.set_baseband_bandwidth(baseband_bandwidth);
+    receiver_model.enable();  // Before using radio::enable(), but not updating Ant.DC-Bias.
 
-	radio::enable({
+/*  radio::enable({     //  this can be removed, previous version,no DC-bias control.
 		tuning_frequency(),
 		sampling_rate,
 		baseband_bandwidth,
@@ -316,8 +321,8 @@ AISAppView::AISAppView(NavigationView& nav) : nav_ { nav } {
 		receiver_model.rf_amp(),
 		static_cast<int8_t>(receiver_model.lna()),
 		static_cast<int8_t>(receiver_model.vga()),
-	});
-
+	}); */
+	
 	options_channel.on_change = [this](size_t, OptionsField::value_t v) {
 		this->on_frequency_changed(v);
 	};
@@ -337,7 +342,8 @@ AISAppView::AISAppView(NavigationView& nav) : nav_ { nav } {
 }
 
 AISAppView::~AISAppView() {
-	radio::disable();
+/*	radio::disable();  */
+	receiver_model.disable();   // to switch off all, including DC bias.
 
 	baseband::shutdown();
 }
diff --git a/firmware/application/apps/gps_sim_app.cpp b/firmware/application/apps/gps_sim_app.cpp
index fb7babc1..f51011c9 100644
--- a/firmware/application/apps/gps_sim_app.cpp
+++ b/firmware/application/apps/gps_sim_app.cpp
@@ -140,13 +140,24 @@ void GpsSimAppView::start() {
 			}
 		);
 	}
+	field_rfgain.on_change = [this](int32_t v) {
+		tx_gain = v;
+	};  
+	field_rfgain.set_value(tx_gain);
+	receiver_model.set_tx_gain(tx_gain); 
+    
+
+ 	field_rfamp.on_change = [this](int32_t v) {
+		rf_amp = (bool)v;
+	};
+	field_rfamp.set_value(rf_amp ? 14 : 0);
 	
 	radio::enable({
 		receiver_model.tuning_frequency(),
 		sample_rate ,
 		baseband_bandwidth,
 		rf::Direction::Transmit,
-		receiver_model.rf_amp(),
+		rf_amp,         //  previous code line : "receiver_model.rf_amp()," was passing the same rf_amp of all Receiver Apps  
 		static_cast<int8_t>(receiver_model.lna()),
 		static_cast<int8_t>(receiver_model.vga())
 	});
@@ -181,6 +192,9 @@ GpsSimAppView::GpsSimAppView(
 	NavigationView& nav
 ) : nav_ (nav)
 {
+	tx_gain = 35;field_rfgain.set_value(tx_gain);  // Initial default  value (-12 dB's max 47dBs ).
+	field_rfamp.set_value(rf_amp ? 14 : 0);  // Initial default value True. (TX RF amp on , +14dB's)
+	
 	baseband::run_image(portapack::spi_flash::image_tag_gps);
 
 	add_children({
@@ -191,8 +205,8 @@ GpsSimAppView::GpsSimAppView(
 		&text_duration,
 		&progressbar,
 		&field_frequency,
-		&field_lna,
-		&field_rf_amp,
+		&field_rfgain,
+		&field_rfamp,       // let's not use common persistent rf_amp , local rfamp is enough
 		&check_loop,
 		&button_play,
 		&waterfall,
diff --git a/firmware/application/apps/gps_sim_app.hpp b/firmware/application/apps/gps_sim_app.hpp
index 4f26c11a..34c7bb2d 100644
--- a/firmware/application/apps/gps_sim_app.hpp
+++ b/firmware/application/apps/gps_sim_app.hpp
@@ -52,6 +52,8 @@ private:
 	static constexpr ui::Dim header_height = 3 * 16;
 	
 	uint32_t sample_rate = 0;
+	int32_t tx_gain { 47 };
+	bool rf_amp { true }; // aux private var to store temporal, same as Replay App rf_amp user selection.
 	static constexpr uint32_t baseband_bandwidth = 3000000; //filter bandwidth
 	const size_t read_size { 16384 };
 	const size_t buffer_count { 3 };
@@ -76,7 +78,7 @@ private:
 	bool ready_signal { false };
 
 	Labels labels {
-		{ { 10 * 8, 2 * 16 }, "LNA:   A:", Color::light_grey() }
+		{ { 10 * 8, 2 * 16 }, "GAIN   A:", Color::light_grey() }
 	};
 	
 	Button button_open {
@@ -104,11 +106,19 @@ private:
 	FrequencyField field_frequency {
 		{ 0 * 8, 2 * 16 },
 	};
-	LNAGainField field_lna {
-		{ 14 * 8, 2 * 16 }
+	NumberField field_rfgain {
+		{ 14 * 8, 2 * 16 },
+		2,
+		{ 0, 47 },
+		1,
+		' '	
 	};
-	RFAmpField field_rf_amp {
-		{ 19 * 8, 2 * 16 }
+	NumberField field_rfamp {     // previously we were using "RFAmpField field_rf_amp" but that is general Receiver amp setting.
+		{ 19 * 8, 2 * 16 },
+		2,
+		{ 0, 14 },                // this time we will display GUI , 0 or 14 dBs same as Mic and Replay App
+		14,
+		' '
 	};
 	Checkbox check_loop {
 		{ 21 * 8, 2 * 16 },
diff --git a/firmware/application/apps/ui_sonde.cpp b/firmware/application/apps/ui_sonde.cpp
index 12da24b2..f38fc3dd 100644
--- a/firmware/application/apps/ui_sonde.cpp
+++ b/firmware/application/apps/ui_sonde.cpp
@@ -100,7 +100,12 @@ SondeView::SondeView(NavigationView& nav) {
 		use_crc = v;
 	};
 	
-	radio::enable({
+    receiver_model.set_tuning_frequency(tuning_frequency());
+    receiver_model.set_sampling_rate(sampling_rate);
+    receiver_model.set_baseband_bandwidth(baseband_bandwidth);
+    receiver_model.enable();   // Before using radio::enable(), but not updating Ant.DC-Bias.
+	
+	/* radio::enable({        // this can be removed, previous version, no DC-bias ant. control.
 		tuning_frequency(),
 		sampling_rate,
 		baseband_bandwidth,
@@ -108,7 +113,7 @@ SondeView::SondeView(NavigationView& nav) {
 		receiver_model.rf_amp(),
 		static_cast<int8_t>(receiver_model.lna()),
 		static_cast<int8_t>(receiver_model.vga()),
-	});
+	}); */
 
 
         // QR code with geo URI
@@ -153,7 +158,8 @@ SondeView::SondeView(NavigationView& nav) {
 
 SondeView::~SondeView() {
 	baseband::set_pitch_rssi(0, false);
-	radio::disable();
+/* 	radio::disable(); */  
+    receiver_model.disable();   // to switch off all, including DC bias.
 	baseband::shutdown();
 	audio::output::stop();
 }
diff --git a/hackrf b/hackrf
index 22267f3b..e6eb4ba2 160000
--- a/hackrf
+++ b/hackrf
@@ -1 +1 @@
-Subproject commit 22267f3b8e71bd064337921444b0e40509f47b43
+Subproject commit e6eb4ba29bbe5dc2fcd092e394188bc10a8bad54