diff --git a/firmware/application/CMakeLists.txt b/firmware/application/CMakeLists.txt
index fd41cc63f..0ca186ad3 100644
--- a/firmware/application/CMakeLists.txt
+++ b/firmware/application/CMakeLists.txt
@@ -281,6 +281,9 @@ set(CPPSRC
 	apps/ui_level.cpp  
 	apps/tpms_app.cpp
 	apps/tpms_app.cpp
+	apps/ui_spectrum_painter.cpp
+	apps/ui_spectrum_painter_image.cpp
+	apps/ui_spectrum_painter_text.cpp
 	protocols/aprs.cpp
 	protocols/ax25.cpp
 	protocols/bht.cpp
diff --git a/firmware/application/apps/capture_app.hpp b/firmware/application/apps/capture_app.hpp
index ab6a1c9ea..9acefaafc 100644
--- a/firmware/application/apps/capture_app.hpp
+++ b/firmware/application/apps/capture_app.hpp
@@ -29,6 +29,23 @@
 #include "ui_record_view.hpp"
 #include "ui_spectrum.hpp"
 
+#define BW_OPTIONS \
+			{ "  8k5", 8500 }, \
+			{ "  11k", 11000 }, \
+			{ "  16k", 16000 }, \
+			{ "  25k", 25000 }, \
+			{ "  50k", 50000 }, \
+			{ " 100k", 100000 }, \
+			{ " 250k", 250000 }, \
+			{ " 500k", 500000 },   /* Previous Limit bandwith Option with perfect micro SD write .C16 format operaton.*/  \
+			{ " 600k", 600000 },   /* That extended option is still possible to record with FW version Mayhem v1.41 (< 2,5MB/sec)  */  \
+ 			{ " 750k", 750000 },   /* From that BW onwards, the LCD is ok, but the recorded file is auto decimated,(not real file size) */  \
+			{ "1100k", 1100000 }, \
+			{ "1750k", 1750000 }, \
+			{ "2000k", 2000000 }, \
+			{ "2500k", 2500000 }, \
+			{ "2750k", 2750000 }    // That is our max Capture option , to keep using later / 8 decimation (22Mhz sampling  ADC)
+
 namespace ui {
 
 class CaptureAppView : public View {
@@ -88,21 +105,7 @@ private:
 		{ 5 * 8, 1 * 16 },
 		5,
 		{
-			{ "  8k5", 8500 },
-			{ " 11k ", 11000 },
-			{ " 16k ", 16000 },
-			{ " 25k ", 25000 },
-			{ " 50k ", 50000 },
-			{ "100k ", 100000 },
-			{ "250k ", 250000 },
-			{ "500k ", 500000 },   // Previous Limit bandwith Option with perfect micro SD write .C16 format operaton.
-			{ "600k ", 600000 },   // That extended option is still possible to record with FW version Mayhem v1.41 (< 2,5MB/sec)  
- 			{ "750k ", 750000 },   // From that BW onwards, the LCD is ok, but the recorded file is auto decimated,(not real file size) 
-			{ "1100k", 1100000 },
-	       	{ "1750k", 1750000 },
-			{ "2000k", 2000000 },
-			{ "2500k", 2500000 },
-			{ "2750k", 2750000 }    // That is our max Capture option , to keep using later / 8 decimation (22Mhz sampling  ADC)
+			BW_OPTIONS
 		}
 	};
 	
diff --git a/firmware/application/apps/ui_fileman.hpp b/firmware/application/apps/ui_fileman.hpp
index 0ff09fa0a..c3312a7c4 100644
--- a/firmware/application/apps/ui_fileman.hpp
+++ b/firmware/application/apps/ui_fileman.hpp
@@ -59,6 +59,7 @@ public:
 
 	void focus() override;	
 	std::string title() const override { return "Fileman"; };
+	void push_dir(const std::filesystem::path& path);
 	
 protected:
 	static constexpr size_t max_filename_length = 64;
@@ -83,7 +84,6 @@ protected:
 	std::filesystem::path get_selected_full_path() const;
 	const fileman_entry& get_selected_entry() const;
 
-	void push_dir(const std::filesystem::path& path);
 	void pop_dir();
 	void refresh_list();
 	void reload_current();
diff --git a/firmware/application/apps/ui_spectrum_painter.cpp b/firmware/application/apps/ui_spectrum_painter.cpp
new file mode 100644
index 000000000..0a1749dab
--- /dev/null
+++ b/firmware/application/apps/ui_spectrum_painter.cpp
@@ -0,0 +1,233 @@
+/*
+ * Copyright (C) 2023 Bernd Herzog
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "ui_spectrum_painter.hpp"
+#include "cpld_update.hpp"
+#include "bmp.hpp"
+#include "baseband_api.hpp"
+
+#include "ui_fileman.hpp"
+#include "io_file.hpp"
+#include "file.hpp"
+#include "portapack_persistent_memory.hpp"
+
+namespace ui {
+
+SpectrumPainterView::SpectrumPainterView(
+	NavigationView& nav
+) : nav_ (nav) {
+	baseband::run_image(portapack::spi_flash::image_tag_spectrum_painter);
+
+	add_children({
+		&labels,
+		&tab_view,
+		&input_image,
+		&input_text,
+		&progressbar,
+		&field_frequency,
+		&field_rfgain, 
+		&field_rfamp,
+		&check_loop,
+		&button_play,
+		&option_bandwidth,
+		&field_duration,
+		&field_pause,
+	});
+
+	Rect view_rect = { 0, 3 * 8, 240, 80 };
+	input_image.set_parent_rect(view_rect);
+	input_text.set_parent_rect(view_rect);
+
+	field_frequency.set_value(target_frequency());
+	field_frequency.set_step(5000);
+	field_frequency.on_change = [this](rf::Frequency f) {
+		this->on_target_frequency_changed(f);
+	};
+	field_frequency.on_edit = [this, &nav]() {
+		auto new_view = nav.push<FrequencyKeypadView>(this->target_frequency());
+		new_view->on_changed = [this](rf::Frequency f) {
+			this->on_target_frequency_changed(f);
+			this->field_frequency.set_value(f);
+		};
+	};
+
+	tx_gain = 10;
+	field_rfgain.set_value(tx_gain);  // Initial default  value (-12 dB's max ).
+    field_rfgain.on_change = [this](int32_t v) { // allow initial value change just after opened file.
+		tx_gain = v;
+		portapack::transmitter_model.set_tx_gain(tx_gain);
+	};
+
+	field_rfamp.set_value(rf_amp ? 14 : 0);  // Initial default value True. (TX RF amp on , +14dB's)
+	field_rfamp.on_change = [this](int32_t v) {	// allow initial value change just after opened file.	
+		rf_amp = (bool)v;
+		portapack::transmitter_model.set_rf_amp(rf_amp);
+	};
+
+	input_image.on_input_avaliable = [this]() {
+		image_input_avaliable = true;
+	};
+
+	button_play.on_select = [this](ImageButton&) {
+		if (tx_active == false) {
+			tx_mode = tab_view.selected();
+
+			if (tx_mode == 0 && image_input_avaliable == false)
+				return;
+
+			//Enable Bias Tee if selected
+			radio::set_antenna_bias(portapack::get_antenna_bias());
+
+			radio::enable({
+				portapack::receiver_model.tuning_frequency(),
+				3072000U,
+				1750000,
+				rf::Direction::Transmit,
+				rf_amp,
+				static_cast<int8_t>(portapack::receiver_model.lna()),
+				static_cast<int8_t>(portapack::receiver_model.vga())
+			});  
+
+			if (portapack::persistent_memory::stealth_mode()){
+				DisplaySleepMessage message;
+				EventDispatcher::send_message(message);
+			}
+
+			button_play.set_bitmap(&bitmap_stop);
+
+			if (tx_mode == 0) {
+				tx_current_max_lines = input_image.get_height();
+				tx_current_width = input_image.get_width();
+			}
+			else {
+				tx_current_max_lines = input_text.get_height();
+				tx_current_width = input_text.get_width();
+			}
+
+			progressbar.set_max(tx_current_max_lines);
+			progressbar.set_value(0);
+
+			baseband::set_spectrum_painter_config(tx_current_width, tx_current_max_lines, false, option_bandwidth.selected_index_value());
+		}
+		else {
+			stop_tx();
+		}
+	};
+
+	option_bandwidth.on_change = [this](size_t, ui::OptionsField::value_t value) {
+		baseband::set_spectrum_painter_config(tx_current_width, tx_current_max_lines, true, value);
+	};
+
+	field_duration.set_value(10);
+	field_pause.set_value(5);
+}
+
+void SpectrumPainterView::start_tx() {
+	tx_current_line = 0;
+	tx_active = true;
+	tx_timestamp_start = chTimeNow();
+}
+
+void SpectrumPainterView::stop_tx() {
+	button_play.set_bitmap(&bitmap_play);
+	portapack::transmitter_model.disable();
+	tx_active = false;
+	tx_current_line = 0;
+}
+
+void SpectrumPainterView::frame_sync() {
+	if (tx_active) {
+		if (fifo->is_empty()) {
+
+			int32_t sequence_duration = (field_duration.value() + ( check_loop.value() ? field_pause.value() : 0)) * 1000;
+			int32_t sequence_time = tx_time_elapsed() % sequence_duration;
+			bool is_pausing = sequence_time > field_duration.value() * 1000;
+
+			if (is_pausing) {
+				fifo->in(std::vector<uint8_t>(tx_current_width));
+			} else {
+				auto current_time_line = sequence_time * tx_current_max_lines / (field_duration.value() * 1000);
+				
+				if (tx_current_line > current_time_line && !check_loop.value()) {
+					fifo->in(std::vector<uint8_t>(tx_current_width));
+					stop_tx();
+					return;
+				}
+
+				tx_current_line = current_time_line;
+				progressbar.set_value(current_time_line);
+
+				if (tx_mode == 0) {
+					std::vector<uint8_t> line = input_image.get_line(current_time_line);
+					fifo->in(line);
+				}
+				else {
+					std::vector<uint8_t> line = input_text.get_line(current_time_line);
+					fifo->in(line);
+				}
+			}
+		}
+	}
+}
+
+SpectrumPainterView::~SpectrumPainterView() {
+	portapack::transmitter_model.disable();
+	hackrf::cpld::load_sram_no_verify();
+	baseband::shutdown();
+}
+
+void SpectrumPainterView::focus() {
+	tab_view.focus();
+}
+
+void SpectrumPainterView::on_target_frequency_changed(rf::Frequency f) {
+	set_target_frequency(f);
+}
+
+void SpectrumPainterView::set_target_frequency(const rf::Frequency new_value) {
+	portapack::persistent_memory::set_tuned_frequency(new_value);
+}
+
+rf::Frequency SpectrumPainterView::target_frequency() const {
+	return portapack::persistent_memory::tuned_frequency();
+}
+
+void SpectrumPainterView::paint(Painter& painter) {
+	View::paint(painter);
+
+	size_t c;
+	Point pos = { 0, screen_pos().y() + 8 + footer_location };
+	
+	for (c = 0; c < 20; c++) {
+		painter.draw_bitmap(
+			pos,
+			bitmap_stripes,
+			ui::Color(191, 191, 0),
+			ui::Color::black()
+		);
+		if (c != 9)
+			pos += { 24, 0 };
+		else
+			pos = { 0, screen_pos().y() + 8 + footer_location + 32 + 8 };
+	}
+}
+
+}
diff --git a/firmware/application/apps/ui_spectrum_painter.hpp b/firmware/application/apps/ui_spectrum_painter.hpp
new file mode 100644
index 000000000..0ecf98653
--- /dev/null
+++ b/firmware/application/apps/ui_spectrum_painter.hpp
@@ -0,0 +1,177 @@
+/*
+ * Copyright (C) 2023 Bernd Herzog
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#pragma once
+
+#include "ui.hpp"
+#include "ui_widget.hpp"
+
+#include "ui_navigation.hpp"
+#include "ui_tabview.hpp"
+#include "capture_app.hpp"
+#include "baseband_api.hpp"
+
+#include "portapack.hpp"
+#include "message.hpp"
+
+#include "ui_spectrum_painter_image.hpp"
+#include "ui_spectrum_painter_text.hpp"
+
+namespace ui {
+
+class SpectrumPainterView : public View {
+public:
+	SpectrumPainterView(NavigationView& nav);
+	~SpectrumPainterView();
+
+	SpectrumPainterView(const SpectrumPainterView&) = delete;
+	SpectrumPainterView(SpectrumPainterView&&) = delete;
+	SpectrumPainterView& operator=(const SpectrumPainterView&) = delete;
+	SpectrumPainterView& operator=(SpectrumPainterView&&) = delete;
+
+	void focus() override;
+	void paint(Painter& painter) override;
+	
+	std::string title() const override { return "Spec.Painter"; };
+
+private:
+	void on_target_frequency_changed(rf::Frequency f);
+	void set_target_frequency(const rf::Frequency new_value);
+	rf::Frequency target_frequency() const;
+
+	NavigationView& nav_;
+	bool image_input_avaliable { false };
+	bool tx_active { false };
+	uint32_t tx_mode { 0 };
+	uint16_t tx_current_line { 0 };
+	uint16_t tx_current_max_lines { 0 };
+	uint16_t tx_current_width { 0 };
+	systime_t tx_timestamp_start { 0 };
+
+	inline uint32_t tx_time_elapsed() {
+		auto now = chTimeNow();
+		return now - tx_timestamp_start;
+	}
+
+	int32_t tx_gain { 47 };
+	bool rf_amp { false };
+
+	SpectrumInputImageView input_image { nav_ };
+	SpectrumInputTextView input_text { nav_ };
+	
+	std::array<View*, 2> input_views { { &input_image, &input_text } };
+
+	TabView tab_view {
+		{ "Image", Color::white(), input_views[0] },
+		{ "Text", Color::white(), input_views[1] }
+	};
+
+	static constexpr int32_t footer_location = 15 * 16 + 8;
+	ProgressBar progressbar {
+		{ 4, footer_location - 16, 240-8, 16 }
+	};
+
+	Labels labels {
+		{ { 10 * 8, footer_location + 1 * 16 }, "GAIN   A:", Color::light_grey() },
+		{ { 1 * 8, footer_location + 2 * 16 }, "BW:      Du:    P:", Color::light_grey() },
+	};
+
+	FrequencyField field_frequency {
+		{ 0 * 8, footer_location + 1 * 16 },
+	};
+	
+	NumberField field_rfgain {
+		{ 14 * 8, footer_location + 1 * 16 },
+		2,
+		{ 0, 47 },
+		1,
+		' '
+	};
+
+	NumberField field_rfamp {
+		{ 19 * 8, footer_location + 1 * 16 },
+		2,
+		{ 0, 14 },
+		14,
+		' '
+	};
+
+	Checkbox check_loop {
+		{ 21 * 8, footer_location + 1 * 16 },
+		4,
+		"Loop",
+		true
+	};
+
+	ImageButton button_play {
+		{ 28 * 8, footer_location + 1 * 16, 2 * 8, 1 * 16 },
+		&bitmap_play,
+		Color::green(),
+		Color::black()
+	};
+
+	OptionsField option_bandwidth {
+		{ 4 * 8, footer_location + 2 * 16 },
+		5,
+		{
+			BW_OPTIONS
+		}
+	};
+	
+	NumberField field_duration {
+		{ 13 * 8, footer_location + 2 * 16 },
+		3,
+		{ 1, 999 },
+		1,
+		' '
+	};
+
+	NumberField field_pause {
+		{ 19 * 8, footer_location + 2 * 16 },
+		2,
+		{ 0, 99 },
+		1,
+		' '
+	};
+
+	SpectrumPainterFIFO* fifo { nullptr };
+	void start_tx();
+	void frame_sync();
+	void stop_tx();
+
+	MessageHandlerRegistration message_handler_fifo_signal {
+		Message::ID::SpectrumPainterBufferResponseConfigure,
+		[this](const Message* const p) {
+			const auto message = static_cast<const SpectrumPainterBufferConfigureResponseMessage*>(p);
+			this->fifo = message->fifo;
+			this->start_tx();
+		}
+	};
+
+	MessageHandlerRegistration message_handler_sample {
+		Message::ID::DisplayFrameSync,
+		[this](const Message* const) {
+			this->frame_sync();
+		}
+	};
+};
+
+}
diff --git a/firmware/application/apps/ui_spectrum_painter_image.cpp b/firmware/application/apps/ui_spectrum_painter_image.cpp
new file mode 100644
index 000000000..c514dee96
--- /dev/null
+++ b/firmware/application/apps/ui_spectrum_painter_image.cpp
@@ -0,0 +1,265 @@
+/*
+ * Copyright (C) 2023 Bernd Herzog
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "ui_spectrum_painter_image.hpp"
+#include "cpld_update.hpp"
+#include "bmp.hpp"
+#include "baseband_api.hpp"
+
+#include "ui_fileman.hpp"
+#include "io_file.hpp"
+#include "file.hpp"
+#include "portapack_persistent_memory.hpp"
+
+namespace ui {
+
+SpectrumInputImageView::SpectrumInputImageView(NavigationView& nav) {
+	hidden(true);
+
+	add_children({
+		&button_load_image
+	});
+
+	button_load_image.on_select = [this, &nav](Button&) {
+		auto open_view = nav.push<FileLoadView>(".bmp");
+
+		constexpr auto data_directory = u"SPECTRUM";
+		if (std::filesystem::is_directory(data_directory) == false) {
+			if (make_new_directory(data_directory).ok())
+				open_view->push_dir(data_directory);
+		}
+		else
+			open_view->push_dir(data_directory);
+
+		open_view->on_changed = [this](std::filesystem::path new_file_path) {
+			this->file = new_file_path.string();
+			painted = false;
+			this->set_dirty();
+
+			this->on_input_avaliable();
+		};
+	};
+}
+
+SpectrumInputImageView::~SpectrumInputImageView() {
+}
+
+void SpectrumInputImageView::focus() {
+    button_load_image.focus();
+}
+
+bool SpectrumInputImageView::drawBMP_scaled(const ui::Rect r, const std::string file) {
+	File bmpimage;
+	size_t file_pos = 0;
+	uint16_t pointer = 0;
+	int16_t px = 0, py, zoom_factor = 0;
+	bmp_header_t bmp_header;
+	char buffer[257];
+	ui::Color line_buffer[240];
+
+	auto result = bmpimage.open(file);
+	if(result.is_valid())
+		return false;
+
+	bmpimage.seek(file_pos);
+	auto read_size = bmpimage.read(&bmp_header, sizeof(bmp_header));
+	if (!((bmp_header.signature == 0x4D42) && // "BM" Signature
+		(bmp_header.planes == 1) && // Seems always to be 1
+		(bmp_header.compression == 0 || bmp_header.compression == 3 ))) {	// No compression
+			return false;
+	}
+
+	switch(bmp_header.bpp) {
+		case 16:
+			file_pos = 0x36;
+			memset(buffer, 0, 16);
+			bmpimage.read(buffer, 16);
+			if(buffer[1] == 0x7C)
+				type = 3; // A1R5G5B5
+			else
+				type = 0; // R5G6B5
+			break;
+		case 24:
+			type = 1;
+			break;
+		case 32:
+		default:
+			type = 2;
+			break;
+	}
+
+	width = bmp_header.width;
+	height = bmp_header.height;
+
+	data_start = file_pos = bmp_header.image_data;
+
+	while (r.width() < (width >> zoom_factor) || r.height() < (height >> zoom_factor)) {
+		zoom_factor++;
+	}
+
+	py = height + 16;
+
+	while(1) {
+		while(px < width) {
+			bmpimage.seek(file_pos);
+			memset(buffer, 0, 257);
+			read_size = bmpimage.read(buffer, 256);
+			if (read_size.is_error())
+				return false;	// Read error
+
+			pointer = 0;
+			while(pointer < 256) {
+				if(pointer + 4 > 256)
+					break;
+				switch(type) {
+					case 0: // R5G6B5
+						if ((((1 << zoom_factor) - 1) & px) == 0x00)
+							line_buffer[px >> zoom_factor] = ui::Color(((uint16_t)buffer[pointer] & 0x1F) | ((uint16_t)buffer[pointer] & 0xE0) << 1 | ((uint16_t)buffer[pointer + 1] & 0x7F) << 9);
+
+						pointer += 2;
+						file_pos += 2;
+						break;
+
+					case 3: // A1R5G5B5
+						if ((((1 << zoom_factor) - 1) & px) == 0x00)
+							line_buffer[px >> zoom_factor] = ui::Color((uint16_t)buffer[pointer] | ((uint16_t)buffer[pointer + 1] << 8));
+
+						pointer += 2;
+						file_pos += 2;
+						break;
+
+					case 1: // 24
+					default:
+						if ((((1 << zoom_factor) - 1) & px) == 0x00)
+							line_buffer[px >> zoom_factor] = ui::Color(buffer[pointer + 2], buffer[pointer + 1], buffer[pointer]);
+						pointer += 3;
+						file_pos += 3;
+						break;
+						
+					case 2: // 32
+						if ((((1 << zoom_factor) - 1) & px) == 0x00)
+							line_buffer[px >> zoom_factor] = ui::Color(buffer[pointer + 2], buffer[pointer + 1], buffer[pointer]);
+						pointer += 4;
+						file_pos += 4;
+						break;
+				}
+
+				px++;
+				if(px >= width) {
+					break;
+				}
+			}
+
+			if(read_size.value() != 256)
+				break;
+		}
+
+		if ((((1 << zoom_factor) - 1) & py) == 0x00)
+			portapack::display.render_line({ r.left(), r.top() + (py >> zoom_factor) }, px >> zoom_factor, line_buffer);
+
+		px = 0;
+		py--;
+
+		if(read_size.value() < 256 || py < 0)
+			break;
+	}
+
+	return true;
+}
+
+uint16_t SpectrumInputImageView::get_width(){
+	return this->width;
+}
+
+uint16_t SpectrumInputImageView::get_height(){
+	return this->height;
+}
+
+std::vector<uint8_t> SpectrumInputImageView::get_line(uint16_t y) {
+	File bmpimage;
+	bmpimage.open(this->file);
+
+	//seek to line
+	uint32_t line_size = width * (type == 2 ? 4 : (type == 1 ? 3 : 2));
+	uint32_t line_offset = y * line_size;
+	bmpimage.seek(data_start + line_offset);
+
+	// allocate memory and read
+	auto buffer = new uint8_t[line_size];
+	auto bytes_read = bmpimage.read(buffer, line_size);
+
+	// greyscale
+	auto grey_buffer = new uint8_t[width];
+	int pointer = 0;
+	for (uint16_t px = 0; px < width; px++) {
+		ui::Color color;
+		switch(type) {
+		case 0: // R5G6B5
+			pointer = px * 2;
+			color = ui::Color(((uint16_t)buffer[pointer] & 0x1F) | ((uint16_t)buffer[pointer] & 0xE0) << 1 | ((uint16_t)buffer[pointer + 1] & 0x7F) << 9);
+			break;
+
+		case 3: // A1R5G5B5
+			pointer = px * 2;
+			color = ui::Color((uint16_t)buffer[pointer] | ((uint16_t)buffer[pointer + 1] << 8));
+			break;
+
+		case 1: // 24
+		default:
+			pointer = px * 3;
+			color = ui::Color(buffer[pointer + 2], buffer[pointer + 1], buffer[pointer]);
+			break;
+
+		case 2: // 32
+			pointer = px * 4;
+			color = ui::Color(buffer[pointer + 2], buffer[pointer + 1], buffer[pointer]);
+			break;
+		}
+
+		grey_buffer[px] = color.to_greyscale();
+	}
+
+	delete buffer;
+
+	std::vector<uint8_t> values(width);
+	for(int i = 0; i < width; i++) {
+		values[i] = grey_buffer[i];
+	}
+
+	delete grey_buffer;
+
+	return values;
+}
+
+void SpectrumInputImageView::paint(Painter& painter) {
+	painter.fill_rectangle(
+		{{0, 40}, {240, 204}},
+		style().background
+	);
+
+	if (!painted) {
+		// This is very slow for big pictures. Do only once.
+		this->drawBMP_scaled({{ 0, 40 }, {240, 160}}, this->file);
+		painted = true;
+	}
+}
+
+}
diff --git a/firmware/application/apps/ui_spectrum_painter_image.hpp b/firmware/application/apps/ui_spectrum_painter_image.hpp
new file mode 100644
index 000000000..51f1f2764
--- /dev/null
+++ b/firmware/application/apps/ui_spectrum_painter_image.hpp
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2023 Bernd Herzog
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#pragma once
+
+#include "ui.hpp"
+#include "ui_widget.hpp"
+
+#include "ui_navigation.hpp"
+#include "ui_tabview.hpp"
+#include "ui_transmitter.hpp"
+#include "baseband_api.hpp"
+
+#include "portapack.hpp"
+#include "message.hpp"
+
+namespace ui {
+
+class SpectrumInputImageView : public View {
+public:
+	SpectrumInputImageView(NavigationView& nav);
+	~SpectrumInputImageView();
+
+	void focus() override;
+	void paint(Painter&) override;
+
+	uint16_t get_width();
+	uint16_t get_height();
+	std::vector<uint8_t> get_line(uint16_t);
+
+	std::function<void()> on_input_avaliable { };
+
+private:
+	bool painted {false};
+	std::string file {""};
+	uint16_t width {0};
+	uint16_t height {0};
+	uint8_t type {0};
+	uint32_t data_start {0};
+	
+	Button button_load_image {
+		{ 0 * 8, 11 * 16 - 4, 30 * 8, 28 },
+		"Load Image ..."
+	};
+	
+	bool drawBMP_scaled(const ui::Rect r, const std::string file);
+};
+
+}
diff --git a/firmware/application/apps/ui_spectrum_painter_text.cpp b/firmware/application/apps/ui_spectrum_painter_text.cpp
new file mode 100644
index 000000000..f4a93cde8
--- /dev/null
+++ b/firmware/application/apps/ui_spectrum_painter_text.cpp
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2023 Bernd Herzog
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "ui_spectrum_painter_text.hpp"
+#include "cpld_update.hpp"
+#include "bmp.hpp"
+#include "baseband_api.hpp"
+
+#include "ui_fileman.hpp"
+#include "io_file.hpp"
+#include "file.hpp"
+#include "portapack_persistent_memory.hpp"
+#include "ui_font_fixed_8x16.hpp"
+
+namespace ui {
+
+SpectrumInputTextView::SpectrumInputTextView(NavigationView& nav) {
+	hidden(true);
+
+	add_children({
+		&text_message_0,
+		&text_message_1,
+		&text_message_2,
+		&text_message_3,
+		&text_message_4,
+		&text_message_5,
+		&text_message_6,
+		&text_message_7,
+		&text_message_8,
+		&text_message_9,
+		&button_message
+	 });
+
+	button_message.on_select = [this, &nav](Button&) {
+		this->on_set_text(nav);
+	};
+}
+
+SpectrumInputTextView::~SpectrumInputTextView() {
+}
+
+void SpectrumInputTextView::on_set_text(NavigationView& nav) {
+	text_prompt(nav, buffer, 300);
+}
+
+void SpectrumInputTextView::focus() {
+    button_message.focus();
+}
+
+void SpectrumInputTextView::paint(Painter& painter) {
+	message = buffer;
+	for (uint32_t i = 0 ; i < text_message.size(); i++) {
+		if (message.length() > i * 30)
+			text_message[i]->set(message.substr(i * 30, 30));
+		else
+			text_message[i]->set("");
+	}
+
+	painter.fill_rectangle(
+		{{0, 40}, {240, 204}},
+		style().background
+	);
+}
+
+constexpr uint32_t pixel_repeat = 32;
+uint16_t SpectrumInputTextView::get_width(){
+	return 16 * pixel_repeat;
+}
+
+uint16_t SpectrumInputTextView::get_height(){
+	return this->message.length() * 8;
+}
+
+std::vector<uint8_t> SpectrumInputTextView::get_line(uint16_t y) {
+	auto character_position = y / 8;
+	auto character = this->message[character_position];
+	auto glyph_data = ui::font::fixed_8x16.glyph(character).pixels();
+	
+	auto line_in_character = y % 8;
+	std::vector<uint8_t> data(16 * pixel_repeat);
+
+	for (uint32_t index = 0; index < 16; index++) {
+		auto glyph_byte = index;
+		auto glyph_bit = line_in_character;
+		uint8_t glyph_pixel = (glyph_data[glyph_byte] & (1 << glyph_bit)) >> glyph_bit;
+
+		for (uint32_t j = 0; j < pixel_repeat; j++)
+			data[index*pixel_repeat + j] = glyph_pixel * 255;
+	}
+
+	return data;
+}
+}
diff --git a/firmware/application/apps/ui_spectrum_painter_text.hpp b/firmware/application/apps/ui_spectrum_painter_text.hpp
new file mode 100644
index 000000000..41b236e56
--- /dev/null
+++ b/firmware/application/apps/ui_spectrum_painter_text.hpp
@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) 2023 Bernd Herzog
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#pragma once
+
+#include "ui.hpp"
+#include "ui_widget.hpp"
+
+#include "ui_navigation.hpp"
+#include "ui_tabview.hpp"
+#include "ui_transmitter.hpp"
+#include "baseband_api.hpp"
+
+#include "portapack.hpp"
+#include "message.hpp"
+
+namespace ui {
+
+class SpectrumInputTextView : public View {
+public:
+	SpectrumInputTextView(NavigationView& nav);
+	~SpectrumInputTextView();
+
+	void focus() override;
+	void paint(Painter&) override;
+	
+	uint16_t get_width();
+	uint16_t get_height();
+	std::vector<uint8_t> get_line(uint16_t);
+
+private:
+	std::string buffer { "PORTAPACK" };
+	std::string message { };
+	void on_set_text(NavigationView& nav);
+
+	Text text_message_0 {
+		{ 0 * 8, 0 * 16, 30 * 8, 16 },
+		""
+	};
+	
+	Text text_message_1 {
+		{ 0 * 8, 1 * 16, 30 * 8, 16 },
+		""
+	};
+	
+	Text text_message_2 {
+		{ 0 * 8, 2 * 16, 30 * 8, 16 },
+		""
+	};
+	
+	Text text_message_3 {
+		{ 0 * 8, 3 * 16, 30 * 8, 16 },
+		""
+	};
+	
+	Text text_message_4 {
+		{ 0 * 8, 4 * 16, 30 * 8, 16 },
+		""
+	};
+	
+	Text text_message_5 {
+		{ 0 * 8, 5 * 16, 30 * 8, 16 },
+		""
+	};
+	
+	Text text_message_6 {
+		{ 0 * 8, 6 * 16, 30 * 8, 16 },
+		""
+	};
+	
+	Text text_message_7 {
+		{ 0 * 8, 7 * 16, 30 * 8, 16 },
+		""
+	};
+	
+	Text text_message_8 {
+		{ 0 * 8, 8 * 16, 30 * 8, 16 },
+		""
+	};
+	
+	Text text_message_9 {
+		{ 0 * 8, 9 * 16, 30 * 8, 16 },
+		""
+	};
+
+	std::array<Text*, 10> text_message { { 
+		&text_message_0,
+		&text_message_1,
+		&text_message_2,
+		&text_message_3,
+		&text_message_4,
+		&text_message_5,
+		&text_message_6,
+		&text_message_7,
+		&text_message_8,
+		&text_message_9,
+	} };
+
+	Button button_message {
+		{ 0 * 8, 11 * 16 - 4, 30 * 8, 28 },
+		"Set message"
+	};
+
+};
+
+}
diff --git a/firmware/application/baseband_api.cpp b/firmware/application/baseband_api.cpp
index ecf161204..37cfb5485 100644
--- a/firmware/application/baseband_api.cpp
+++ b/firmware/application/baseband_api.cpp
@@ -299,6 +299,11 @@ void set_siggen_config(const uint32_t bw, const uint32_t shape, const uint32_t d
 	send_message(&message);
 }
 
+void set_spectrum_painter_config(const uint16_t width, const uint16_t height, bool update, int32_t bw){
+	SpectrumPainterBufferConfigureRequestMessage message { width, height, update, bw };
+	send_message(&message);
+}
+
 static bool baseband_image_running = false;
 
 void run_image(const portapack::spi_flash::image_tag_t image_tag) {
diff --git a/firmware/application/baseband_api.hpp b/firmware/application/baseband_api.hpp
index e1c93545c..71887af0a 100644
--- a/firmware/application/baseband_api.hpp
+++ b/firmware/application/baseband_api.hpp
@@ -91,6 +91,7 @@ void set_rds_data(const uint16_t message_length);
 void set_spectrum(const size_t sampling_rate, const size_t trigger);
 void set_siggen_tone(const uint32_t tone);
 void set_siggen_config(const uint32_t bw, const uint32_t shape, const uint32_t duration);
+void set_spectrum_painter_config(const uint16_t width, const uint16_t height, bool update, int32_t bw);
 void request_beep();
 
 void run_image(const portapack::spi_flash::image_tag_t image_tag);
diff --git a/firmware/application/ui_navigation.cpp b/firmware/application/ui_navigation.cpp
index 7df55e688..7103feb71 100644
--- a/firmware/application/ui_navigation.cpp
+++ b/firmware/application/ui_navigation.cpp
@@ -73,6 +73,7 @@
 #include "ui_whipcalc.hpp"
 #include "ui_flash_utility.hpp"
 #include "ui_sd_over_usb.hpp"
+#include "ui_spectrum_painter.hpp"
 
 //#include "acars_app.hpp"
 #include "ais_app.hpp"
@@ -596,6 +597,7 @@ TransmittersMenuView::TransmittersMenuView(NavigationView& nav) {
 		{ "TEDI/LCR",		ui::Color::yellow(),	&bitmap_icon_lcr,		[&nav](){ nav.push<LCRView>(); } },
 		{ "TouchTune",		ui::Color::yellow(),	&bitmap_icon_remote,	[&nav](){ nav.push<TouchTunesView>(); } },
 		{ "Playlist",		ui::Color::yellow(),	&bitmap_icon_remote,	[&nav](){ nav.push<PlaylistView>(); } },
+		{ "S.Painter",		ui::Color::orange(),	&bitmap_icon_morse,		[&nav](){ nav.push<SpectrumPainterView>(); } },
 		//{ "Remote",			ui::Color::dark_grey(),	&bitmap_icon_remote,	[&nav](){ nav.push<RemoteView>(); } },
 	});
 }
diff --git a/firmware/baseband/CMakeLists.txt b/firmware/baseband/CMakeLists.txt
index b19059d47..c6b44ef2a 100644
--- a/firmware/baseband/CMakeLists.txt
+++ b/firmware/baseband/CMakeLists.txt
@@ -140,6 +140,7 @@ set(CPPSRC
 	debug.cpp
 	${COMMON}/gcc.cpp
 	${COMMON}/performance_counter.cpp
+	${COMMON}/random.cpp
 	tone_gen.cpp
 )
 
@@ -463,6 +464,13 @@ set(MODE_CPPSRC
 )
 DeclareTargets(PSIG siggen)
 
+### Spectrum painter
+
+set(MODE_CPPSRC
+	proc_spectrum_painter.cpp
+)
+DeclareTargets(PSPT spectrum_painter)
+
 ### SSTV TX
 
 set(MODE_CPPSRC
diff --git a/firmware/baseband/proc_spectrum_painter.cpp b/firmware/baseband/proc_spectrum_painter.cpp
new file mode 100644
index 000000000..87512d477
--- /dev/null
+++ b/firmware/baseband/proc_spectrum_painter.cpp
@@ -0,0 +1,178 @@
+/*
+ * Copyright (C) 2023 Bernd Herzog
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "proc_spectrum_painter.hpp"
+#include "event_m4.hpp"
+#include "dsp_fft.hpp"
+#include "random.hpp"
+
+#include <cstdint>
+
+// TODO move to class members SpectrumPainterProcessor
+complex16_t *current_line_data = nullptr;
+complex16_t * volatile next_line_data = nullptr;
+uint32_t current_line_index = 0;
+uint32_t current_line_width = 0;
+int32_t current_bw = 0;
+
+std::vector<uint8_t> fifo_data[1 << SpectrumPainterBufferConfigureResponseMessage::fifo_k] { };
+SpectrumPainterFIFO fifo { fifo_data, SpectrumPainterBufferConfigureResponseMessage::fifo_k };
+
+int max_val = 127;
+
+// This is called at 3072000/2048 = 1500Hz
+void SpectrumPainterProcessor::execute(const buffer_c8_t& buffer) {
+
+	for (uint32_t i = 0; i < buffer.count; i++) {
+	 	if (current_line_data != nullptr) {
+			auto data = current_line_data[(current_line_index++ * current_bw / 3072 ) % current_line_width];
+			buffer.p[i] = {(int8_t) data.real(), (int8_t) data.imag()};
+		}
+		else
+			buffer.p[i] = {0, 0};
+	}
+
+	// collect new data
+	if (next_line_data != nullptr) {
+		if (current_line_data != nullptr)
+			delete current_line_data;
+
+		current_line_data = next_line_data;
+		next_line_data = nullptr;
+	}
+}
+
+WORKING_AREA(thread_wa, 4096);
+
+void SpectrumPainterProcessor::run() {
+	int ui = 0;
+	init_genrand(22267);
+
+	while (true) {
+		if (fifo.is_empty() == false && next_line_data == nullptr) {
+			std::vector<uint8_t> data;
+			fifo.out(data);
+
+			auto picture_width = data.size();
+
+			auto fft_width = picture_width * 2;
+			auto qu = fft_width/4;
+			
+			complex16_t *v = new complex16_t[fft_width];
+			complex16_t *tmp = new complex16_t[fft_width];
+
+			for (uint32_t fft_index = 0; fft_index < fft_width; fft_index++) {
+				if (fft_index < qu) {
+				}
+				else if (fft_index < qu*3) {
+					//TODO: Improve index handling
+					auto image_index = fft_index-qu;
+
+					auto bin_power = data[image_index]; // 0 to 255
+					auto bin_phase = genrand_int31(); // 0 to 255
+
+					// rotate by random angle
+					auto phase_cos = (sine_table_i8[((int)(bin_phase + 0x40)) & 0xFF]); // -127 to 127
+            		auto phase_sin = (sine_table_i8[((int)(bin_phase)) & 0xFF]);
+
+					auto real = (int16_t)((int16_t)phase_cos * bin_power / 255); // -127 to 127
+					auto imag = (int16_t)((int16_t)phase_sin * bin_power / 255); // -127 to 127
+
+					auto fftshift_index = 0;
+					if (fft_index < qu*2) // first half (fft_index = qu; fft_index < qu*2)
+						fftshift_index = fft_index + 2*qu; // goes to back
+					else	 // 2nd half (fft_index =  qu*2; fft_index < qu*3)
+						fftshift_index = fft_index - 2*qu; // goes to front
+
+					v[fftshift_index] = {real, imag};
+				}
+			}
+
+			ifft<complex16_t>(v, fft_width, tmp);
+
+			// normalize
+			volatile int32_t maximum = 1;
+			for (uint32_t i = 0; i < fft_width; i++) {
+				if (v[i].real() > maximum)
+					maximum = v[i].real();
+				if (v[i].real() < -maximum)
+					maximum = -v[i].real();
+				if (v[i].imag() > maximum)
+					maximum = v[i].imag();
+				if (v[i].imag() < -maximum)
+					maximum = -v[i].imag();
+			}
+
+			if (maximum == 1) { // a black line
+				for (uint32_t i = 0; i < fft_width; i++)
+					v[i] = {0, 0};
+			}
+			else {
+				for (uint32_t i = 0; i < fft_width; i++) {
+					v[i] = { (int8_t)((int32_t)v[i].real() * 120 / maximum), (int8_t)((int32_t)v[i].imag() * 120 / maximum)};
+				}
+			}
+
+			delete tmp;
+			next_line_data = v;
+			ui++;
+		}
+		else {
+			chThdSleepMilliseconds(1);
+		}
+	}
+}
+
+void SpectrumPainterProcessor::on_message(const Message* const msg) {
+
+	switch(msg->id) {
+		case Message::ID::SpectrumPainterBufferRequestConfigure:
+		{
+			const auto message = *reinterpret_cast<const SpectrumPainterBufferConfigureRequestMessage*>(msg);
+			current_line_width = message.width;
+			current_bw = message.bw / 500;
+
+			if (message.update == false) {
+				SpectrumPainterBufferConfigureResponseMessage response { &fifo };
+				shared_memory.application_queue.push(response);
+			
+				if (configured == false) {
+					thread = chThdCreateStatic(thread_wa, sizeof(thread_wa),
+						NORMALPRIO, SpectrumPainterProcessor::fn,
+						this
+					);
+			
+					configured = true;
+				}
+			}
+			break;
+		}
+
+		default:
+			break;
+	}
+}
+
+int main() {
+	EventDispatcher event_dispatcher { std::make_unique<SpectrumPainterProcessor>() };
+	event_dispatcher.run();
+	return 0;
+}
diff --git a/firmware/baseband/proc_spectrum_painter.hpp b/firmware/baseband/proc_spectrum_painter.hpp
new file mode 100644
index 000000000..92ee29fee
--- /dev/null
+++ b/firmware/baseband/proc_spectrum_painter.hpp
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2023 Bernd Herzog
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#pragma once
+
+#include "portapack_shared_memory.hpp"
+#include "baseband_processor.hpp"
+#include "baseband_thread.hpp"
+
+class SpectrumPainterProcessor : public BasebandProcessor {
+public:
+	void execute(const buffer_c8_t& buffer) override;
+	void on_message(const Message* const p) override;
+	void run();
+
+private:
+	bool configured { false };
+	BasebandThread baseband_thread { 3072000, this, NORMALPRIO + 20, baseband::Direction::Transmit };
+	Thread* thread {nullptr};
+
+protected:
+	static msg_t fn(void* arg) {
+		auto obj = static_cast<SpectrumPainterProcessor*>(arg);
+		obj->run();
+
+		return 0;
+	}
+};
diff --git a/firmware/common/dsp_fft.cpp b/firmware/common/dsp_fft.cpp
index 26f558e07..8d2f61541 100644
--- a/firmware/common/dsp_fft.cpp
+++ b/firmware/common/dsp_fft.cpp
@@ -20,3 +20,4 @@
  */
 
 #include "dsp_fft.hpp"
+#include "complex.hpp"
diff --git a/firmware/common/dsp_fft.hpp b/firmware/common/dsp_fft.hpp
index c3884689b..f830c12ba 100644
--- a/firmware/common/dsp_fft.hpp
+++ b/firmware/common/dsp_fft.hpp
@@ -33,6 +33,7 @@
 #include "complex.hpp"
 #include "hal.h"
 #include "utility.hpp"
+#include "sine_table_int8.hpp"
 
 namespace std {
 	/* https://github.com/AE9RB/fftbench/blob/master/cxlr.hpp
@@ -135,4 +136,45 @@ void fft_c_preswapped(std::array<T, N>& data, const size_t from, const size_t to
 	}
 }
 
+/* 
+   ifft(v,N):
+   [0] If N==1 then return.
+   [1] For k = 0 to N/2-1, let ve[k] = v[2*k]
+   [2] Compute ifft(ve, N/2);
+   [3] For k = 0 to N/2-1, let vo[k] = v[2*k+1]
+   [4] Compute ifft(vo, N/2);
+   [5] For m = 0 to N/2-1, do [6] through [9]
+   [6]   Let w.real() = cos(2*PI*m/N)
+   [7]   Let w.imag() = sin(2*PI*m/N)
+   [8]   Let v[m] = ve[m] + w*vo[m]
+   [9]   Let v[m+N/2] = ve[m] - w*vo[m]
+ */
+template<typename T>
+void ifft( T *v, int n, T *tmp )
+{
+    if(n>1) {
+        int k,m;
+		T z, w, *vo, *ve;
+        ve = tmp; vo = tmp+n/2;
+        for(k=0; k<n/2; k++) {
+            ve[k] = v[2*k];
+            vo[k] = v[2*k+1];
+        }
+        ifft( ve, n/2, v );		/* FFT on even-indexed elements of v[] */
+        ifft( vo, n/2, v );		/* FFT on odd-indexed elements of v[] */
+        for(m=0; m<n/2; m++) {
+            w.real(sine_table_i8[((int)(m/(double)n * 0x100 + 0x40)) & 0xFF]);
+            w.imag(sine_table_i8[((int)(m/(double)n * 0x100)) & 0xFF]);
+
+            z.real((w.real()*vo[m].real() - w.imag()*vo[m].imag())/127);	/* Re(w*vo[m]) */
+            z.imag((w.real()*vo[m].imag() + w.imag()*vo[m].real())/127);	/* Im(w*vo[m]) */
+            v[  m  ].real(ve[m].real() + z.real());
+            v[  m  ].imag(ve[m].imag() + z.imag());
+            v[m+n/2].real(ve[m].real() - z.real());
+            v[m+n/2].imag(ve[m].imag() - z.imag());
+        }
+    }
+    return;
+}
+
 #endif/*__DSP_FFT_H__*/
diff --git a/firmware/common/lcd_ili9341.cpp b/firmware/common/lcd_ili9341.cpp
index 51a238d95..5b66c8be7 100644
--- a/firmware/common/lcd_ili9341.cpp
+++ b/firmware/common/lcd_ili9341.cpp
@@ -489,8 +489,8 @@ bool ILI9341::drawBMP2(const ui::Point p, const std::string file) {
 				if(pointer + 4 > 256)
 					break;
 				switch(type) {
-					case 0:
-					case 3:
+					case 0: // R5G6B5
+					case 3: // A1R5G5B5
 						if(!type)
 							line_buffer[px] = ui::Color((uint16_t)buffer[pointer] | ((uint16_t)buffer[pointer + 1] << 8));
 						else
@@ -498,13 +498,13 @@ bool ILI9341::drawBMP2(const ui::Point p, const std::string file) {
 						pointer += 2;
 						file_pos += 2;
 						break;
-					case 1:
+					case 1: // 24
 					default:
 						line_buffer[px] = ui::Color(buffer[pointer + 2], buffer[pointer + 1], buffer[pointer]);
 						pointer += 3;
 						file_pos += 3;
 						break;
-					case 2:
+					case 2: // 32
 						line_buffer[px] = ui::Color(buffer[pointer + 2], buffer[pointer + 1], buffer[pointer]);
 						pointer += 4;
 						file_pos += 4;
diff --git a/firmware/common/message.hpp b/firmware/common/message.hpp
index a7a0784b7..4b71f5545 100644
--- a/firmware/common/message.hpp
+++ b/firmware/common/message.hpp
@@ -109,6 +109,8 @@ public:
 		AudioSpectrum = 52,
 		APRSPacket = 53,
 		APRSRxConfigure = 54,
+		SpectrumPainterBufferRequestConfigure = 55,
+		SpectrumPainterBufferResponseConfigure = 56,
 		MAX
 	};
 
@@ -1143,4 +1145,40 @@ public:
 	uint32_t return_code;
 };
 
+class SpectrumPainterBufferConfigureRequestMessage : public Message {
+public:
+	constexpr SpectrumPainterBufferConfigureRequestMessage(
+		uint16_t width,
+		uint16_t height,
+		bool update,
+		int32_t bw
+	) : Message { ID::SpectrumPainterBufferRequestConfigure },
+		width { width },
+		height { height },
+		update { update },
+		bw { bw }
+	{
+	}
+
+	uint16_t width;
+	uint16_t height;
+	bool update;
+	int32_t bw;
+};
+
+using SpectrumPainterFIFO = FIFO<std::vector<uint8_t>>;
+class SpectrumPainterBufferConfigureResponseMessage : public Message {
+public:
+	static constexpr size_t fifo_k = 2;
+
+	constexpr SpectrumPainterBufferConfigureResponseMessage(
+		SpectrumPainterFIFO* fifo
+	) : Message { ID::SpectrumPainterBufferResponseConfigure },
+		fifo { fifo }
+	{
+	}
+
+	SpectrumPainterFIFO* fifo { nullptr };
+};
+
 #endif/*__MESSAGE_H__*/
diff --git a/firmware/common/portapack_shared_memory.hpp b/firmware/common/portapack_shared_memory.hpp
index 667552a97..df5be8a19 100644
--- a/firmware/common/portapack_shared_memory.hpp
+++ b/firmware/common/portapack_shared_memory.hpp
@@ -68,7 +68,7 @@ struct SharedMemory {
 	uint8_t volatile request_m4_performance_counter{ 0 };
 	uint8_t volatile m4_cpu_usage{ 0 };
 	uint16_t volatile m4_stack_usage{ 0 };
-	uint16_t volatile m4_heap_usage{ 0 };
+	uint32_t volatile m4_heap_usage{ 0 };
 	uint16_t volatile m4_buffer_missed{ 0 };
 };
 
diff --git a/firmware/common/random.cpp b/firmware/common/random.cpp
new file mode 100644
index 000000000..b7de06c41
--- /dev/null
+++ b/firmware/common/random.cpp
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2023 Bernd Herzog
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "random.hpp"
+
+static unsigned long state[N]; /* the array for the state vector  */
+static int rnd_left = 1;
+static int rnd_init = 0;
+static unsigned long *rnd_next;
+
+/* initializes state[N] with a seed */
+void init_genrand(unsigned long s)
+{
+    int j;
+    state[0] = s & 0xffffffffUL;
+
+    for (j = 1; j < N; j++)
+    {
+        state[j] = (1812433253UL * (state[j - 1] ^ (state[j - 1] >> 30)) + j);
+        /* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */
+        /* In the previous versions, MSBs of the seed affect   */
+        /* only MSBs of the array state[].                     */
+        /* 2002/01/09 modified by Makoto Matsumoto             */
+        state[j] &= 0xffffffffUL; /* for >32 bit machines      */
+    }
+
+    rnd_left = 1;
+    rnd_init = 1;
+}
+
+static void next_state(void)
+{
+    unsigned long *p = state;
+    int j;
+
+    /* if init_genrand() has not been called, */
+    /* a default initial seed is used         */
+    if (rnd_init == 0)
+        init_genrand(5489UL);
+
+    rnd_left = N;
+    rnd_next = state;
+
+    for (j = N - M + 1; --j; p++)
+        *p = p[M] ^ TWIST(p[0], p[1]);
+
+    for (j = M; --j; p++)
+        *p = p[M - N] ^ TWIST(p[0], p[1]);
+
+    *p = p[M - N] ^ TWIST(p[0], state[0]);
+}
+
+long genrand_int31(void)
+{
+    unsigned long y;
+
+    if (--rnd_left == 0)
+        next_state();
+    y = *rnd_next++;
+
+    /* Tempering */
+    y ^= (y >> 11);
+    y ^= (y << 7) & 0x9d2c5680UL;
+    y ^= (y << 15) & 0xefc60000UL;
+    y ^= (y >> 18);
+
+    return (long)(y >> 1);
+}
diff --git a/firmware/common/random.hpp b/firmware/common/random.hpp
new file mode 100644
index 000000000..5442fc319
--- /dev/null
+++ b/firmware/common/random.hpp
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2023 Bernd Herzog
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#pragma once
+
+/* Period parameters */
+#define N 624
+#define M 397
+#define MATRIX_A 0x9908b0dfUL /* constant vector a */
+#define UMASK 0x80000000UL    /* most significant w-r bits */
+#define LMASK 0x7fffffffUL    /* least significant r bits */
+#define MIXBITS(u, v) (((u)&UMASK) | ((v)&LMASK))
+#define TWIST(u, v) ((MIXBITS(u, v) >> 1) ^ ((v)&1UL ? MATRIX_A : 0UL))
+
+/* initializes state[N] with a seed */
+extern void init_genrand(unsigned long s);
+extern long genrand_int31(void);
diff --git a/firmware/common/spi_image.hpp b/firmware/common/spi_image.hpp
index 89679284f..486197e20 100644
--- a/firmware/common/spi_image.hpp
+++ b/firmware/common/spi_image.hpp
@@ -104,6 +104,7 @@ constexpr image_tag_t image_tag_rds					{ 'P', 'R', 'D', 'S' };
 constexpr image_tag_t image_tag_replay				{ 'P', 'R', 'E', 'P' };
 constexpr image_tag_t image_tag_gps					{ 'P', 'G', 'P', 'S' };
 constexpr image_tag_t image_tag_siggen				{ 'P', 'S', 'I', 'G' };
+constexpr image_tag_t image_tag_spectrum_painter	{ 'P', 'S', 'P', 'T' };
 constexpr image_tag_t image_tag_sstv_tx				{ 'P', 'S', 'T', 'X' };
 constexpr image_tag_t image_tag_tones				{ 'P', 'T', 'O', 'N' };
 constexpr image_tag_t image_tag_flash_utility		{ 'P', 'F', 'U', 'T' };
diff --git a/firmware/common/ui.hpp b/firmware/common/ui.hpp
index 2c27fd33b..853a73676 100644
--- a/firmware/common/ui.hpp
+++ b/firmware/common/ui.hpp
@@ -57,6 +57,16 @@ struct Color {
 		)}
 	{
 	}
+
+	uint8_t to_greyscale() {
+		uint32_t r = ((v >> 11) & 31U) << 3;
+		uint32_t g = ((v >> 5)  & 63U) << 2;
+		uint32_t b = (v         & 31U) << 3;
+
+		uint32_t grey = (r * 299 + g * 587 + b * 114) / 1000;
+
+		return (uint8_t)grey;
+	}
 	
 	Color operator-() const {
 		return (v ^ 0xffff);