diff --git a/libpsk/include/codec/trx_device_base.hpp b/libpsk/include/codec/trx_device_base.hpp
index aa2959e..15e6e15 100644
--- a/libpsk/include/codec/trx_device_base.hpp
+++ b/libpsk/include/codec/trx_device_base.hpp
@@ -213,6 +213,11 @@ public:
 	{
 		return m_tx_codec;
 	}
+	//Set FFT interval
+	void set_fft_interval( unsigned short timeout )
+	{
+		m_spectrum_timeout = timeout;
+	}
 	//Lock and unlock device
 	virtual void lock( bool lock ) = 0;
 private:
@@ -229,11 +234,13 @@ protected:
 		m_mode = mode::off;
 	}
 private:
-	tx_codec* m_tx_codec { nullptr };	/* Transmit codec ptr */
+	tx_codec* m_tx_codec { nullptr };			/* Transmit codec ptr */
 	std::array<rx_codec*, MAX_CODECS> m_rx_codecs {{}};	/* RX codecs array */
-	spectrum_calculator m_spectrum;		/* Spectrum calculator object */
-	const event_handler_t m_evt_callback;	/* Event handler object */
-	mode m_mode { mode::off };				/* Current device mode */
+	spectrum_calculator m_spectrum;				/* Spectrum calculator object */
+	unsigned m_spectrum_tmr {};					/* Spectrum time */
+	unsigned short m_spectrum_timeout { 250 };	/* Spectrum timeout */
+	const event_handler_t m_evt_callback;		/* Event handler object */
+	mode m_mode { mode::off };					/* Current device mode */
 };
 
 
diff --git a/libpsk/include/psk/spectrum_calculator.hpp b/libpsk/include/psk/spectrum_calculator.hpp
index 7c6fd09..764b1af 100644
--- a/libpsk/include/psk/spectrum_calculator.hpp
+++ b/libpsk/include/psk/spectrum_calculator.hpp
@@ -42,11 +42,22 @@ public:
 	spectrum_calculator()
 	{}
 public:
-	//Copy sample buffer
-	void copy_samples( const pow_t* samples )
+	bool copy_samples( const pow_t* samples, size_t len )
 	{
-		std::memcpy( m_real, samples, sizeof(pow_t) * WIDTH );
+		size_t cpyn = WIDTH - m_sample_buf_cnt;
+		if( len < cpyn ) cpyn = len;
+		std::memcpy( &m_real[m_sample_buf_cnt], samples, sizeof(pow_t) * cpyn );
+		m_sample_buf_cnt += cpyn;
 		m_energy_calculated = false;
+		if( m_sample_buf_cnt >= WIDTH )
+		{
+			m_sample_buf_cnt = 0;
+			return true;
+		}
+		else
+		{
+			return false;
+		}
 	}
 	//Get buffer samples and calculate it
 	const pow_t& operator[]( size_t idx )
@@ -104,6 +115,7 @@ private:
 	bool m_energy_calculated { false };		//Energy is calculated
 	scale m_scale { scale::log };			//Current scale
 	pow_t m_factor { std::numeric_limits<pow_t>::max() };
+	short m_sample_buf_cnt {};		//Sample buffer counter
 };
 
 /*----------------------------------------------------------*/
diff --git a/libpsk/src/codec/trx_device_base.cpp b/libpsk/src/codec/trx_device_base.cpp
index 5cb685a..c2877a6 100644
--- a/libpsk/src/codec/trx_device_base.cpp
+++ b/libpsk/src/codec/trx_device_base.cpp
@@ -7,7 +7,6 @@
 
 /* ------------------------------------------------------------------------- */
 #include "codec/trx_device_base.hpp"
-
 /* ------------------------------------------------------------------------- */
 //Namespace def
 namespace ham {
@@ -74,6 +73,14 @@ void trx_device_base::adc_process( const sample_type *buf, size_t len )
 		if( v != nullptr )
 			(*v)( buf, len );
 	}
+	//Calculate the tout sample
+	m_spectrum_tmr += (1000*len)/get_rx_sample_rate();
+	if( m_spectrum_tmr >= m_spectrum_timeout )
+	{
+		//True if all samples completed
+		if( m_spectrum.copy_samples( buf, len ) )
+			m_spectrum_tmr = 0;
+	}
 }
 /* ------------------------------------------------------------------------- */
 //DAC vector func return true if finished