diff --git a/firmware/application/CMakeLists.txt b/firmware/application/CMakeLists.txt
index 7b49448a3..5fad90a25 100644
--- a/firmware/application/CMakeLists.txt
+++ b/firmware/application/CMakeLists.txt
@@ -144,6 +144,7 @@ set(CPPSRC
 	protocols/ax25.cpp
 	protocols/bht.cpp
 	protocols/dcs.cpp
+	protocols/encoders.cpp
 	protocols/lcr.cpp
 	protocols/rds.cpp
 	serializer.cpp
diff --git a/firmware/application/protocols/bht.cpp b/firmware/application/protocols/bht.cpp
index b54b151e1..787ce2bec 100644
--- a/firmware/application/protocols/bht.cpp
+++ b/firmware/application/protocols/bht.cpp
@@ -21,74 +21,56 @@
  */
 
 #include "bht.hpp"
-
-#include "portapack.hpp"
 #include "portapack_persistent_memory.hpp"
 
-#include <cstring>
-#include <stdio.h>
-
-std::string gen_message_ep(uint8_t city_code, size_t family_code_ep, uint32_t relay_state_A, uint32_t relay_state_B) {
+size_t gen_message_ep(uint8_t city_code, size_t family_code_ep, uint32_t relay_number, uint32_t relay_state) {
 	size_t c;
 	const encoder_def_t * um3750_def;
-	uint8_t bit[12];
-	std::string ep_symbols;
-	char ook_bitstream[256];
-	char ep_message[13] = { 0 };
+	uint8_t bits[12];
+	std::string ep_fragments;
+	//char ep_message[13] = { 0 };
 	
-	(void)relay_state_B;
-	
-	// EP frame
 	// Repeated 2x 26 times
 	// Whole frame + space = 128ms, data only = 64ms
 	
-	um3750_def = &encoder_defs[8];
+	um3750_def = &encoder_defs[ENCODER_UM3750];
 
+	// City code is bit-reversed
 	for (c = 0; c < 8; c++)
-		bit[c] = (city_code >> c) & 1;
+		bits[c] = (city_code >> c) & 1;
 	
-	bit[8] = family_code_ep >> 1;
-	bit[9] = family_code_ep & 1;
-	bit[10] = 0;		// R1 first
-	if (relay_state_A)
-		bit[11] = relay_state_A - 1;
-	else
-		bit[11] = 0;
+	bits[8] = (family_code_ep >> 1) & 1;
+	bits[9] = family_code_ep & 1;
+	bits[10] = relay_number & 1;
+	bits[11] = relay_state ? 1 : 0;
 	
-	for (c = 0; c < 12; c++)
-		ep_message[c] = bit[c] + '0';
-	
-	//text_message.set(ep_message);
+	// Text for display
+	//for (c = 0; c < 12; c++)
+	//	ep_message[c] = bits[c] + '0';
 
 	c = 0;
 	for (auto ch : um3750_def->word_format) {
 		if (ch == 'S')
-			ep_symbols += um3750_def->sync;
+			ep_fragments += um3750_def->sync;
 		else
-			ep_symbols += um3750_def->bit_format[bit[c++]];
+			ep_fragments += um3750_def->bit_format[bits[c++]];
 	}
 	
-	c = 0;
-	for (auto ch : ep_symbols) {
-		if (ch != '0')
-			ook_bitstream[c >> 3] |= (1 << (7 - (c & 7)));
-		c++;
-	}
-	
-	return ep_message;
+	// Return bitstream length
+	return make_bitstream(ep_fragments);
 }
 
 std::string gen_message_xy(const std::string& ascii_code) {
 	std::string local_code = ascii_code;
-	uint8_t ccir_message[20];
+	uint8_t ccir_message[XY_TONE_COUNT];
 	uint8_t translate;
 	uint32_t c;
 	
 	// Replace repeats with E code
-	for (c = 1; c < 20; c++)
+	for (c = 1; c < XY_TONE_COUNT; c++)
 		if (local_code[c] == local_code[c - 1]) local_code[c] = 'E';
 		
-	for (c = 0; c < 20; c++) {
+	for (c = 0; c < XY_TONE_COUNT; c++) {
 		if (local_code[c] <= '9')
 			translate = local_code[c] - '0';
 		else
@@ -97,7 +79,7 @@ std::string gen_message_xy(const std::string& ascii_code) {
 	}
 	
 	// Copy for baseband
-	memcpy(shared_memory.bb_data.tones_data.message, ccir_message, 20);
+	memcpy(shared_memory.bb_data.tones_data.message, ccir_message, XY_TONE_COUNT);
 	
 	// Return as text for display
 	return local_code;
@@ -106,10 +88,8 @@ std::string gen_message_xy(const std::string& ascii_code) {
 std::string gen_message_xy(size_t header_code_a, size_t header_code_b, size_t city_code, size_t family_code,
 							bool subfamily_wc, size_t subfamily_code, bool id_wc, size_t receiver_code,
 							size_t relay_state_A, size_t relay_state_B, size_t relay_state_C, size_t relay_state_D) {
-	uint8_t ccir_message[20];
+	uint8_t ccir_message[XY_TONE_COUNT];
 	size_t c;
-	
-	// Xy CCIR frame
 
 	// Header
 	ccir_message[0] = (header_code_a / 10);
@@ -123,19 +103,19 @@ std::string gen_message_xy(size_t header_code_a, size_t header_code_b, size_t ci
 	ccir_message[6] = family_code;
 	
 	if (subfamily_wc)
-		ccir_message[7] = 10;		// Wildcard
+		ccir_message[7] = 0xA;		// Wildcard
 	else
 		ccir_message[7] = subfamily_code;
 	
 	if (id_wc) {
-		ccir_message[8] = 10;		// Wildcard
-		ccir_message[9] = 10;		// Wildcard
+		ccir_message[8] = 0xA;		// Wildcard
+		ccir_message[9] = 0xA;		// Wildcard
 	} else {
 		ccir_message[8] = (receiver_code / 10);
 		ccir_message[9] = (receiver_code % 10);
 	}
 	
-	ccir_message[10] = 11;			// B
+	ccir_message[10] = 0xB;
 	
 	// Relay states
 	ccir_message[11] = relay_state_A;
@@ -143,18 +123,18 @@ std::string gen_message_xy(size_t header_code_a, size_t header_code_b, size_t ci
 	ccir_message[13] = relay_state_C;
 	ccir_message[14] = relay_state_D;
 	
-	ccir_message[15] = 11;			// B
+	ccir_message[15] = 0xB;
 	
 	// End
-	for (c = 16; c < 20; c++)
+	for (c = 16; c < XY_TONE_COUNT; c++)
 		ccir_message[c] = 0;
 	
 	// Replace repeats with E code
-	for (c = 1; c < 20; c++)
-		if (ccir_message[c] == ccir_message[c - 1]) ccir_message[c] = 14;
+	for (c = 1; c < XY_TONE_COUNT; c++)
+		if (ccir_message[c] == ccir_message[c - 1]) ccir_message[c] = 0xE;
 	
 	// Copy for baseband
-	memcpy(shared_memory.bb_data.tones_data.message, ccir_message, 20);
+	memcpy(shared_memory.bb_data.tones_data.message, ccir_message, XY_TONE_COUNT);
 	
 	// Return as text for display
 	return ccir_to_ascii(ccir_message);
@@ -163,7 +143,7 @@ std::string gen_message_xy(size_t header_code_a, size_t header_code_b, size_t ci
 std::string ccir_to_ascii(uint8_t * ccir) {
 	std::string ascii;
 	
-	for (size_t c = 0; c < 20; c++) {
+	for (size_t c = 0; c < XY_TONE_COUNT; c++) {
 		if (ccir[c] > 9)
 			ascii += (char)(ccir[c] - 10 + 'A');
 		else
diff --git a/firmware/application/protocols/bht.hpp b/firmware/application/protocols/bht.hpp
index 192ddb6ed..31ff1b9d0 100644
--- a/firmware/application/protocols/bht.hpp
+++ b/firmware/application/protocols/bht.hpp
@@ -21,17 +21,16 @@
  */
 
 #include "ui.hpp"
-#include "ui_widget.hpp"
 #include "ui_navigation.hpp"
 
 #include "tonesets.hpp"
 #include "encoders.hpp"
-#include "portapack.hpp"
 
 using namespace encoders;
 
 #define XY_TONE_LENGTH	((TONES_SAMPLERATE * 0.1) - 1)		// 100ms
 #define XY_SILENCE 		(TONES_SAMPLERATE * 0.4)			// 400ms
+#define XY_TONE_COUNT	20
 	
 struct bht_city {
 	std::string name;
@@ -39,9 +38,7 @@ struct bht_city {
 	bool recent;
 };
 
-//const rf::Frequency bht_freqs[7] = { 31325000, 31387500, 31437500, 31475000, 31687500, 31975000, 88000000 };
-
-std::string gen_message_ep(uint8_t city_code, size_t family_code_ep, uint32_t relay_state_A, uint32_t relay_state_B);
+size_t gen_message_ep(uint8_t city_code, size_t family_code_ep, uint32_t relay_state_A, uint32_t relay_state_B);
 std::string gen_message_xy(const std::string& code);
 std::string gen_message_xy(size_t header_code_a, size_t header_code_b, size_t city_code, size_t family_code,
 							bool subfamily_wc, size_t subfamily_code, bool id_wc, size_t receiver_code,
diff --git a/firmware/application/protocols/encoders.cpp b/firmware/application/protocols/encoders.cpp
new file mode 100644
index 000000000..409a91a1d
--- /dev/null
+++ b/firmware/application/protocols/encoders.cpp
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2017 Furrtek
+ * 
+ * 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.hpp"
+#include "ui_navigation.hpp"
+#include "encoders.hpp"
+
+using namespace portapack;
+
+namespace encoders {
+
+size_t make_bitstream(std::string& fragments) {
+	uint8_t byte = 0;
+	size_t bitstream_length = 0;
+	uint8_t * bitstream = shared_memory.bb_data.data;
+	
+	for (auto c : fragments) {
+		byte <<= 1;
+		if (c != '0')
+			byte |= 1;
+		
+		if ((bitstream_length & 7) == 7)
+			bitstream[bitstream_length >> 3] = byte;
+		
+		bitstream_length++;
+	}
+	
+	// Finish last byte if needed
+	size_t padding =  8 - (bitstream_length & 7);
+	if (padding != 8) {
+		byte <<= padding;
+		bitstream[(bitstream_length + padding - 1) >> 3] = byte;
+		padding++;
+	}
+	
+	return bitstream_length;
+}
+	
+} /* namespace encoders */
diff --git a/firmware/application/protocols/encoders.hpp b/firmware/application/protocols/encoders.hpp
index 0d51a37a7..1da137f10 100644
--- a/firmware/application/protocols/encoders.hpp
+++ b/firmware/application/protocols/encoders.hpp
@@ -20,6 +20,7 @@
  * Boston, MA 02110-1301, USA.
  */
 
+#include <vector>
 #include <cstring>
 #include <string>
 
@@ -29,7 +30,11 @@
 namespace encoders {
 	
 	#define ENC_TYPES_COUNT 14
-	#define OOK_SAMPLERATE 2280000U
+	#define OOK_SAMPLERATE	2280000U
+	
+	#define ENCODER_UM3750	8
+	
+	size_t make_bitstream(std::string& fragments);
 
 	struct encoder_def_t {
 		std::string name;						// Encoder chip ref/name
@@ -151,9 +156,9 @@ namespace encoders {
 			96, 32,
 			{ "011", "001" },
 			12,	"SAAAAAAAAAAAA",
-			"1",
+			"001",
 			100000,	4,
-			0	// ?
+			(3 * 12) - 6	// Compensates for pause delay bug in proc_ook
 		},
 		
 		// UM3758
diff --git a/firmware/application/ui_bht_tx.cpp b/firmware/application/ui_bht_tx.cpp
index 5494644e0..b65c79681 100644
--- a/firmware/application/ui_bht_tx.cpp
+++ b/firmware/application/ui_bht_tx.cpp
@@ -21,13 +21,11 @@
  */
 
 #include "ui_bht_tx.hpp"
+#include "string_format.hpp"
 
 #include "baseband_api.hpp"
 #include "portapack_persistent_memory.hpp"
 
-#include <cstring>
-#include <stdio.h>
-
 using namespace portapack;
 
 namespace ui {
@@ -36,57 +34,98 @@ void BHTView::focus() {
 	tx_view.focus();
 }
 
-BHTView::~BHTView() {
-	transmitter_model.disable();
-	baseband::shutdown();
-}
-
 void BHTView::start_tx() {
-	uint8_t c;
+	baseband::shutdown();
 	
-	view_xylos.generate_message();
-	view_EPAR.generate_message();
-	
-	if (view_xylos.tx_mode == XylosView::tx_modes::SINGLE)
-		progressbar.set_max(20);
-	else if (view_xylos.tx_mode == XylosView::tx_modes::SEQUENCE)
-		progressbar.set_max(20 * XY_SEQ_COUNT);
-	
-	transmitter_model.set_sampling_rate(1536000);
-	transmitter_model.set_rf_amp(true);
-	transmitter_model.set_baseband_bandwidth(1750000);
-	transmitter_model.enable();
-	
-	// Setup tones for Xy
-	for (c = 0; c < 16; c++)
-		baseband::set_tone(c, ccir_deltas[c], XY_TONE_LENGTH);
-	
-	baseband::set_tones_config(transmitter_model.channel_bandwidth(), XY_SILENCE, 20, false, false);
+	if (tx_type == XYLOS) {
+		
+		baseband::run_image(portapack::spi_flash::image_tag_tones);
+		
+		view_xylos.generate_message();
+		
+		//if (view_xylos.tx_mode == XylosView::tx_modes::SINGLE)
+			progressbar.set_max(20);
+		//else if (view_xylos.tx_mode == XylosView::tx_modes::SEQUENCE)
+		//	progressbar.set_max(20 * XY_SEQ_COUNT);
+		
+		transmitter_model.set_sampling_rate(TONES_SAMPLERATE);
+		transmitter_model.set_rf_amp(true);
+		transmitter_model.set_baseband_bandwidth(1750000);
+		transmitter_model.enable();
+		
+		// Setup tones
+		for (size_t c = 0; c < ccir_deltas.size(); c++)
+			baseband::set_tone(c, ccir_deltas[c], XY_TONE_LENGTH);
+		
+		baseband::set_tones_config(transmitter_model.channel_bandwidth(), XY_SILENCE, XY_TONE_COUNT, false, false);
+		
+	} else if (tx_type == EPAR) {
+		
+		baseband::run_image(portapack::spi_flash::image_tag_ook);
+		
+		size_t bitstream_length = view_EPAR.generate_message();
+		
+		progressbar.set_max(2 * 26);
+		
+		transmitter_model.set_sampling_rate(OOK_SAMPLERATE);
+		transmitter_model.set_rf_amp(true);
+		transmitter_model.set_baseband_bandwidth(1750000);
+		transmitter_model.enable();
+
+		baseband::set_ook_data(
+			bitstream_length,
+			OOK_SAMPLERATE / 580,
+			26,
+			encoder_defs[ENCODER_UM3750].pause_symbols
+		);
+	}
 }
 
 void BHTView::on_tx_progress(const int progress, const bool done) {
-	uint8_t c;
+	//if (view_xylos.tx_mode == XylosView::tx_modes::SINGLE) {
 	
-	if (view_xylos.tx_mode == XylosView::tx_modes::SINGLE) {
+	if (done) {
+		transmitter_model.disable();
+		view_xylos.tx_mode = XylosView::tx_modes::IDLE;
+		tx_view.set_transmitting(false);
+	}
+	
+	if (tx_type == XYLOS) {
 		if (done) {
-			transmitter_model.disable();
-			progressbar.set_value(0);
-			
 			if (!checkbox_cligno.value()) {
 				view_xylos.tx_mode = XylosView::tx_modes::IDLE;
 				tx_view.set_transmitting(false);
+				progressbar.set_value(0);
 			} else {
 				chThdSleepMilliseconds(field_tempo.value() * 1000);	// Dirty :(
 				
-				view_EPAR.flip_relays();
 				view_xylos.flip_relays();
 				
 				start_tx();
 			}
-		} else {
+		} else
 			progressbar.set_value(progress);
-		}
-	} else if (view_xylos.tx_mode == XylosView::tx_modes::SEQUENCE) {
+	} else if (tx_type == EPAR) {
+		if (done) {
+			if (!view_EPAR.half) {
+				view_EPAR.half = 1;
+				start_tx();		// Start second half of transmission
+			} else {
+				view_EPAR.half = 0;
+				progressbar.set_value(0);
+				if (checkbox_cligno.value()) {
+					chThdSleepMilliseconds(field_tempo.value() * 1000);	// Dirty :(
+					
+					view_EPAR.flip_relays();
+					
+					start_tx();
+				}
+			}
+		} else
+			progressbar.set_value((26 * view_EPAR.half) + progress);
+	}
+	
+	/*} else if (view_xylos.tx_mode == XylosView::tx_modes::SEQUENCE) {
 		if (done) {
 			transmitter_model.disable();
 			
@@ -105,7 +144,59 @@ void BHTView::on_tx_progress(const int progress, const bool done) {
 		} else {
 			progressbar.set_value((view_xylos.seq_index * 20) + progress);
 		}
-	}
+	}*/
+}
+
+BHTView::~BHTView() {
+	transmitter_model.disable();
+	baseband::shutdown();
+}
+
+BHTView::BHTView(NavigationView& nav) {
+	add_children({
+		&tab_view,
+		&labels,
+		&view_xylos,
+		&view_EPAR,
+		&checkbox_cligno,
+		&field_tempo,
+		&progressbar,
+		&text_message,
+		&tx_view
+	});
+	
+	field_tempo.set_value(1);
+	
+	tx_view.on_edit_frequency = [this, &nav]() {
+		auto new_view = nav.push<FrequencyKeypadView>(receiver_model.tuning_frequency());
+		new_view->on_changed = [this](rf::Frequency f) {
+			transmitter_model.set_tuning_frequency(f);
+		};
+	};
+	
+	/*button_seq.on_select = [this, &nav](Button&) {
+		if (tx_mode == IDLE) {
+			seq_index = 0;
+			tx_mode = SEQUENCE;
+			tx_view.set_transmitting(true);
+			start_tx();
+		}
+	};*/
+	
+	tx_view.on_start = [this]() {
+		if (view_xylos.tx_mode == XylosView::tx_modes::IDLE) {
+			view_xylos.tx_mode = XylosView::tx_modes::SINGLE;
+			tx_view.set_transmitting(true);
+			tx_type = (tx_type_t)tab_view.selected();
+			start_tx();
+		}
+	};
+	
+	tx_view.on_stop = [this]() {
+		transmitter_model.disable();
+		tx_view.set_transmitting(false);
+		view_xylos.tx_mode = XylosView::tx_modes::IDLE;
+	};
 }
 
 void EPARView::flip_relays() {
@@ -113,25 +204,23 @@ void EPARView::flip_relays() {
 	relay_states[0].set_selected_index(relay_states[0].selected_index() ^ 1);
 }
 
-void EPARView::generate_message() {
-	//text_message.set(
-		gen_message_ep(field_city.value(), field_group.selected_index_value(),
-						relay_states[0].selected_index(), relay_states[1].selected_index());
-	//);
+size_t EPARView::generate_message() {
+	// R2, then R1
+	return gen_message_ep(field_city.value(), field_group.selected_index_value(),
+							1 - half, relay_states[half].selected_index());
 }
 
-EPARView::EPARView() {
-	size_t n;
+EPARView::EPARView(
+	Rect parent_rect
+) : View(parent_rect) {
 	
 	hidden(true);
 	
-	//baseband::run_image(portapack::spi_flash::image_tag_ook);
-	
 	add_children({
 		&labels,
 		&field_city,
 		&field_group,
-		&button_scan
+		//&button_scan
 	});
 
 	field_city.set_value(220);
@@ -144,7 +233,7 @@ EPARView::EPARView() {
 		this->generate_message();
 	};
 	
-	n = 0;
+	size_t n = 0;
 	for (auto& relay_state : relay_states) {
 		relay_state.on_change = relay_state_fn;
 		relay_state.set_parent_rect({
@@ -163,35 +252,34 @@ void EPARView::focus() {
 }
 
 void XylosView::flip_relays() {
-	size_t rs;
+	// Invert first relay's state if not ignored
+	size_t rs = relay_states[0].selected_index();
 	
-	// Invert first relay's state
-	rs = relay_states[0].selected_index();
-	if (rs > 0) relay_states[0].set_selected_index(rs ^ 3);
+	if (rs > 0)
+		relay_states[0].set_selected_index(rs ^ 3);
 }
 
 void XylosView::generate_message() {
-	if (tx_mode == SINGLE) {
+	//if (tx_mode == SINGLE) {
 		//text_message.set(
 			gen_message_xy(field_header_a.value(), field_header_b.value(), field_city.value(), field_family.value(), 
 							checkbox_wcsubfamily.value(), field_subfamily.value(), checkbox_wcid.value(), field_receiver.value(),
 							relay_states[0].selected_index(), relay_states[1].selected_index(), 
 							relay_states[2].selected_index(), relay_states[3].selected_index());
 		//);
-	} else if (tx_mode == SEQUENCE) {
+	/*} else if (tx_mode == SEQUENCE) {
 		//text_message.set(
 			gen_message_xy(sequence_matin[seq_index].code);
 		//);
-	}
+	}*/
 }
 
-XylosView::XylosView() {
-	size_t n;
+XylosView::XylosView(
+	Rect parent_rect
+) : View(parent_rect) {
 	
 	hidden(true);
 	
-	//baseband::run_image(portapack::spi_flash::image_tag_tones);
-	
 	add_children({
 		&labels,
 		&field_header_a,
@@ -202,7 +290,7 @@ XylosView::XylosView() {
 		&checkbox_wcsubfamily,
 		&field_receiver,
 		&checkbox_wcid,
-		&button_seq,
+		//&button_seq,
 	});
 
 	field_header_a.set_value(0);
@@ -236,7 +324,7 @@ XylosView::XylosView() {
 		this->generate_message();
 	};
 	
-	n = 0;
+	size_t n = 0;
 	for (auto& relay_state : relay_states) {
 		relay_state.on_change = relay_state_fn;
 		relay_state.set_parent_rect({
@@ -254,57 +342,4 @@ void XylosView::focus() {
 	field_city.focus();
 }
 
-BHTView::BHTView(NavigationView& nav) {
-	Rect view_rect = { 0, 3 * 8, 240, 192 };
-	
-	baseband::run_image(portapack::spi_flash::image_tag_tones);
-
-	add_children({
-		&tab_view,
-		&labels,
-		&view_xylos,
-		&view_EPAR,
-		&checkbox_cligno,
-		&field_tempo,
-		&progressbar,
-		&text_message,
-		&tx_view
-	});
-	
-	view_xylos.set_parent_rect(view_rect);
-	view_EPAR.set_parent_rect(view_rect);
-	
-	field_tempo.set_value(0);
-	
-	tx_view.on_edit_frequency = [this, &nav]() {
-		auto new_view = nav.push<FrequencyKeypadView>(receiver_model.tuning_frequency());
-		new_view->on_changed = [this](rf::Frequency f) {
-			transmitter_model.set_tuning_frequency(f);
-		};
-	};
-	
-	/*button_seq.on_select = [this, &nav](Button&) {
-		if (tx_mode == IDLE) {
-			seq_index = 0;
-			tx_mode = SEQUENCE;
-			tx_view.set_transmitting(true);
-			start_tx();
-		}
-	};*/
-	
-	tx_view.on_start = [this]() {
-		if (view_xylos.tx_mode == XylosView::tx_modes::IDLE) {
-			view_xylos.tx_mode = XylosView::tx_modes::SINGLE;
-			tx_view.set_transmitting(true);
-			start_tx();
-		}
-	};
-	
-	tx_view.on_stop = [this]() {
-		transmitter_model.disable();
-		tx_view.set_transmitting(false);
-		view_xylos.tx_mode = XylosView::tx_modes::IDLE;
-	};
-}
-
 } /* namespace ui */
diff --git a/firmware/application/ui_bht_tx.hpp b/firmware/application/ui_bht_tx.hpp
index f11ff58ec..cac62b118 100644
--- a/firmware/application/ui_bht_tx.hpp
+++ b/firmware/application/ui_bht_tx.hpp
@@ -40,7 +40,7 @@ namespace ui {
 
 class XylosView : public View {
 public:
-	XylosView();
+	XylosView(Rect parent_rect);
 	
 	void focus() override;
 	
@@ -163,13 +163,15 @@ private:
 
 class EPARView : public View {
 public:
-	EPARView();
+	EPARView(Rect parent_rect);
 	
 	void focus() override;
 	
 	void flip_relays();
-	void generate_message();
+	size_t generate_message();
 
+	size_t half { 0 };
+	
 private:
 	Labels labels {
 		{ { 4 * 8, 1 * 8 }, "Code ville:", Color::light_grey() },
@@ -222,8 +224,17 @@ private:
 	void on_tx_progress(const int progress, const bool done);
 	void start_tx();
 	
-	XylosView view_xylos { };
-	EPARView view_EPAR { };
+	enum tx_type_t {
+		XYLOS = 0,
+		EPAR = 1
+	};
+	
+	tx_type_t tx_type = { };
+	
+	Rect view_rect = { 0, 3 * 8, 240, 192 };
+	
+	XylosView view_xylos { view_rect };
+	EPARView view_EPAR { view_rect };
 	
 	TabView tab_view {
 		{ "Xylos", Color::cyan(), &view_xylos },
diff --git a/firmware/application/ui_encoders.cpp b/firmware/application/ui_encoders.cpp
index dd9f214fe..b003dd396 100644
--- a/firmware/application/ui_encoders.cpp
+++ b/firmware/application/ui_encoders.cpp
@@ -126,10 +126,10 @@ void EncodersConfigView::on_show() {
 }
 
 void EncodersConfigView::draw_waveform() {
-	size_t length = frame_symbols.length();
+	size_t length = frame_fragments.length();
 
 	for (size_t n = 0; n < length; n++) {
-		if (frame_symbols[n] == '0')
+		if (frame_fragments[n] == '0')
 			waveform_buffer[n] = 0;
 		else
 			waveform_buffer[n] = 1;
@@ -142,13 +142,13 @@ void EncodersConfigView::draw_waveform() {
 void EncodersConfigView::generate_frame() {
 	size_t i = 0;
 	
-	frame_symbols.clear();
+	frame_fragments.clear();
 	
 	for (auto c : encoder_def->word_format) {
 		if (c == 'S')
-			frame_symbols += encoder_def->sync;
+			frame_fragments += encoder_def->sync;
 		else
-			frame_symbols += encoder_def->bit_format[symfield_word.get_sym(i++)];
+			frame_fragments += encoder_def->bit_format[symfield_word.get_sym(i++)];
 	}
 	
 	draw_waveform();
@@ -285,9 +285,7 @@ void EncodersView::on_txdone(int n, const bool txdone) {
 
 void EncodersView::start_tx(const bool scan) {
 	(void)scan;
-	uint8_t byte = 0;
-	size_t bitstream_length =0;
-	uint8_t * bitstream = shared_memory.bb_data.data;
+	size_t bitstream_length = 0;
 	
 	repeat_min = view_config.repeat_min();
 	
@@ -311,14 +309,7 @@ void EncodersView::start_tx(const bool scan) {
 	
 	view_config.generate_frame();
 	
-	for (auto c : view_config.frame_symbols) {
-		byte <<= 1;
-		if (c != '0')
-			byte |= 1;
-		if ((bitstream_length & 7) == 7)
-			bitstream[bitstream_length >> 3] = byte;
-		bitstream_length++;
-	}
+	bitstream_length = make_bitstream(view_config.frame_fragments);
 
 	transmitter_model.set_sampling_rate(OOK_SAMPLERATE);
 	transmitter_model.set_rf_amp(true);
diff --git a/firmware/application/ui_encoders.hpp b/firmware/application/ui_encoders.hpp
index c7521da87..be1d8352f 100644
--- a/firmware/application/ui_encoders.hpp
+++ b/firmware/application/ui_encoders.hpp
@@ -48,7 +48,7 @@ public:
 	uint32_t pause_symbols();
 	void generate_frame();
 	
-	std::string frame_symbols = "0";
+	std::string frame_fragments = "0";
 
 private:
 	//bool abort_scan = false;
diff --git a/firmware/application/ui_tabview.cpp b/firmware/application/ui_tabview.cpp
index 91cb650b2..9f250bc6a 100644
--- a/firmware/application/ui_tabview.cpp
+++ b/firmware/application/ui_tabview.cpp
@@ -32,12 +32,12 @@ Tab::Tab() {
 };
 
 void Tab::set(
-	uint16_t index,
+	uint32_t index,
 	Dim width,
 	std::string text,
 	Color text_color
 ) {
-	set_parent_rect({ index * width, 0, width, 24 });
+	set_parent_rect({ (Coord)(index * width), 0, width, 24 });
 	
 	text_ = text.substr(0, (width - 8) / 8);
 	text_color_ = text_color;
@@ -99,7 +99,7 @@ bool Tab::on_touch(const TouchEvent event) {
 	}
 }
 
-void TabView::set_selected(uint16_t index) {
+void TabView::set_selected(uint32_t index) {
 	Tab * tab;
 	
 	if (index >= n_tabs)
diff --git a/firmware/application/ui_tabview.hpp b/firmware/application/ui_tabview.hpp
index 550a4e519..0fed8619e 100644
--- a/firmware/application/ui_tabview.hpp
+++ b/firmware/application/ui_tabview.hpp
@@ -41,12 +41,12 @@ public:
 	bool on_key(const KeyEvent key) override;
 	bool on_touch(const TouchEvent event) override;
 	
-	void set(uint16_t index, Dim width, std::string text, Color text_color);
+	void set(uint32_t index, Dim width, std::string text, Color text_color);
 
 private:
 	std::string text_ { };
 	Color text_color_ { };
-	uint16_t index_ { };
+	uint32_t index_ { };
 };
 
 class TabView : public View {
@@ -63,7 +63,10 @@ public:
 	void focus() override;
 	void on_show() override;
 	
-	void set_selected(uint16_t index);
+	void set_selected(uint32_t index);
+	uint32_t selected() {
+		return current_tab;
+	};
 
 private:
 	size_t n_tabs { };
diff --git a/firmware/baseband/proc_ook.cpp b/firmware/baseband/proc_ook.cpp
index da27720f4..4d2039328 100644
--- a/firmware/baseband/proc_ook.cpp
+++ b/firmware/baseband/proc_ook.cpp
@@ -100,7 +100,7 @@ void OOKProcessor::on_message(const Message* const p) {
 	if (message.id == Message::ID::OOKConfigure) {
 		samples_per_bit = message.samples_per_bit / 10;
 		repeat = message.repeat - 1;
-		length = message.stream_length - 1;
+		length = message.stream_length;
 		pause = message.pause_symbols + 1;
 	
 		pause_counter = 0;
diff --git a/firmware/common/tonesets.hpp b/firmware/common/tonesets.hpp
index 4f8450fb9..d1d9851f4 100644
--- a/firmware/common/tonesets.hpp
+++ b/firmware/common/tonesets.hpp
@@ -41,7 +41,7 @@
 #define DTMF_R2	TONES_F2D(852)
 #define DTMF_R3	TONES_F2D(941)
 
-const uint32_t ccir_deltas[16] = {
+const std::array<uint32_t, 16> ccir_deltas = {
 	TONES_F2D(1981),
 	TONES_F2D(1124),
 	TONES_F2D(1197),
@@ -80,7 +80,7 @@ const uint32_t dtmf_deltas[16][2] = {
 	{ DTMF_C0, DTMF_R3 }
 };
 
-const uint32_t eia_deltas[16] = {
+const std::array<uint32_t, 16> eia_deltas = {
 	TONES_F2D(600),
 	TONES_F2D(741),
 	TONES_F2D(882),
@@ -99,7 +99,7 @@ const uint32_t eia_deltas[16] = {
 	TONES_F2D(1091)
 };
 
-const uint32_t zvei_deltas[16] = {
+const std::array<uint32_t, 16> zvei_deltas = {
 	TONES_F2D(2400),
 	TONES_F2D(1060),
 	TONES_F2D(1160),
diff --git a/firmware/common/ui_widget.cpp b/firmware/common/ui_widget.cpp
index d7b197140..c5e370880 100644
--- a/firmware/common/ui_widget.cpp
+++ b/firmware/common/ui_widget.cpp
@@ -491,7 +491,7 @@ void BigFrequency::paint(Painter& painter) {
 				break;
 		}
 		
-		digit_pos = { (240 - ((7 * digit_width) + 8) - (i * digit_width)) / 2, rect.location().y() };
+		digit_pos = { (Coord)(240 - ((7 * digit_width) + 8) - (i * digit_width)) / 2, rect.location().y() };
 	}
 	
 	segment_color = style().foreground;
diff --git a/firmware/portapack-h1-havoc.bin b/firmware/portapack-h1-havoc.bin
index a8873f971..7bdb3fcd0 100644
Binary files a/firmware/portapack-h1-havoc.bin and b/firmware/portapack-h1-havoc.bin differ