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Improved FM modulation

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pull/34/head
erikkaashoek 3 years ago
parent 0b5d0a3b94
commit 8200336ccd
2 changed files with 33 additions and 49 deletions
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50
sa_core.c
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@ -236,13 +236,9 @@ void set_output_path(freq_t f, float level)
if (signal_path == PATH_HIGH) {
return; //TODO setup high path
}
#if 1 // Symetric modulation
float ATTENUATION_RESERVE = 3.0;
if (setting.modulation == MO_AM)
ATTENUATION_RESERVE = 6.0;
#else
#define ATTENUATION_RESERVE 3.0 // Always 3dB in attenuator
#endif
// if (signal_path != PATH_LEAKAGE)
level += ATTENUATION_RESERVE;
@ -482,7 +478,7 @@ void update_min_max_freq(void)
minFreq = 0;
#ifdef TINYSA4
#ifdef __ULTRA_OUT__
maxFreq = ULTRA_MAX_FREQ; // MAX_LO_FREQ;
maxFreq = ULTRA_MAX_FREQ+60000000; // Add 60MHz to go to 5.40GHz
#else
maxFreq = MAX_LOW_OUTPUT_FREQ;
#endif
@ -1259,13 +1255,10 @@ void set_level(float v) // Set the output level in dB in high/low output
v -= LOW_OUT_OFFSET;
if (v < SL_GENLOW_LEVEL_MIN)
v = SL_GENLOW_LEVEL_MIN;
#if 1 // Symetric modulation
if (setting.modulation == MO_AM) {
// if (v > SL_GENLOW_LEVEL_MAX -3)
// v = SL_GENLOW_LEVEL_MAX - 3;
} else
#endif
if (v > SL_GENLOW_LEVEL_MAX)
v = SL_GENLOW_LEVEL_MAX;
@ -3389,35 +3382,26 @@ pureRSSI_t perform(bool break_on_operation, int i, freq_t f, int tracking) /
clock_at_48MHz();
#endif
#define INITIAL_MODULATION_CORRECTION -180
#ifdef TINYSA4 // Calculate AM/FM modulation
if (setting.modulation == MO_AM) {
int sinus_index = 1;
config.cor_am = -180; // Initialize with some spare
config.cor_am = INITIAL_MODULATION_CORRECTION; // Initialize with some spare
modulation_steps = MAX_MODULATION_STEPS; // Search modulation steps that fit frequency
while ( (modulation_delay = (8000000/ modulation_steps ) / setting.modulation_frequency + config.cor_am) < 20 && modulation_steps > 4) {
sinus_index <<= 1;
modulation_steps >>= 1;
}
int offset347 = (setting.modulation_depth_x100 < 100 ? setting.modulation_depth_x100 - 6: setting.modulation_depth_x100) * 347 / 100;
for (int i = 0; i < modulation_steps/4 + 1; i++) {
#if 1 // Symetric modulation
for (int i = 0; i < modulation_steps/4+1; i++) {
fm_modulation[i] = offset347 * sinus[i*sinus_index]/347;
fm_modulation[modulation_steps/2 - i] = fm_modulation[i];
fm_modulation[modulation_steps/2 + i] = - offset347 * sinus[i*sinus_index]/347;
fm_modulation[modulation_steps - i] = fm_modulation[modulation_steps/2 + i];
#else
fm_modulation[i] = (694 - offset347 + offset347 * sinus[i*sinus_index]/347);
fm_modulation[modulation_steps/2 - i] = fm_modulation[i];
fm_modulation[modulation_steps/2 + i] = (694 - offset347 - offset347 * sinus[i*sinus_index]/347);
fm_modulation[modulation_steps - i] = fm_modulation[modulation_steps/2 + i];
#endif
}
for (int i=0; i < modulation_steps; i++) {
#if 1 // symetrical modulation
fm_modulation[i] = roundf(20.0*logf(1.0+(fm_modulation[i]/347.0)));
#else
fm_modulation[i] = roundf(10.0*logf(fm_modulation[i]*fm_modulation[i]/(694.0*694.0)));
#endif
if (fm_modulation[i] > 12)
fm_modulation[i] = 12;
if (fm_modulation[i] < -63)
@ -3426,14 +3410,14 @@ pureRSSI_t perform(bool break_on_operation, int i, freq_t f, int tracking) /
}
if (setting.modulation == MO_WFM) {
int sinus_index = 1;
config.cor_am = -180; // Initialize with some spare
config.cor_am = INITIAL_MODULATION_CORRECTION; // Initialize with some spare
modulation_steps = MAX_MODULATION_STEPS; // Search modulation steps that fit frequency
//modulation_steps = 8; // <-----------------TEMP!!!!!
while ( (modulation_delay = (8000000/ modulation_steps ) / setting.modulation_frequency + config.cor_am) < 100 && modulation_steps > 4) {
while ( ((modulation_delay = (8000000/ modulation_steps ) / setting.modulation_frequency + config.cor_am)) < 100 && modulation_steps > 4) {
sinus_index <<= 1;
modulation_steps >>= 1;
}
for (int i = 0; i < modulation_steps/4 + 1; i++) {
for (int i = 0; i < modulation_steps/4+1; i++) {
fm_modulation[i] = setting.modulation_deviation_div100 * sinus[i*sinus_index]/100;
fm_modulation[modulation_steps/2 - i] = fm_modulation[i];
fm_modulation[modulation_steps/2 + i] = -fm_modulation[i];
@ -3741,7 +3725,7 @@ modulation_again:
if (modulation_counter >= modulation_steps) {
modulation_counter = 0;
cycle_counter++;
if (config.cor_am == -180) {
if (config.cor_am == INITIAL_MODULATION_CORRECTION) {
if (chVTGetSystemTimeX() - start_of_sweep_timestamp > 1000) { // 100 ms, System tick 10000 per second
start_of_sweep_timestamp = chVTGetSystemTimeX();
modulation_delay -= config.cor_am;
@ -3999,7 +3983,7 @@ again: // Spur redu
} else { // Output mode
#ifdef __ULTRA__
if (S_IS_AUTO(setting.below_IF)) {
if ((freq_t)lf > MAX_ABOVE_IF_FREQ && lf <= ULTRA_MAX_FREQ )
if ((freq_t)lf > MAX_ABOVE_IF_FREQ && lf <= ULTRA_MAX_FREQ + 60000000)
setting.below_IF = S_AUTO_ON; // Only way to reach this range. Use below IF in harmonic mode
else
setting.below_IF = S_AUTO_OFF; // default is above IF, Use below IF in harmonic mode
@ -4136,9 +4120,9 @@ again: // Spur redu
}
else
ADF4351_R_counter(4);
} else {
}
#if 0
if (actual_rbw_x10 < 1000) {
else if (actual_rbw_x10 < 1000) {
freq_t tf = ((lf + actual_rbw_x10*1000) / TXCO_DIV3) * TXCO_DIV3;
if (tf + actual_rbw_x10*100 >= lf && tf < lf + actual_rbw_x10*100) // 10MHz
setting.increased_R = true;
@ -4146,21 +4130,21 @@ again: // Spur redu
else
setting.increased_R = true;
ADF4351_R_counter(3);
} else
}
#endif
if (get_sweep_frequency(ST_SPAN)<5000000) { // When scanning less then 5MHz
else if (get_sweep_frequency(ST_SPAN)<5000000) { // When scanning less then 5MHz
if (actual_rbw_x10 <= 3000) {
setting.increased_R = true;
freq_t tf = ((lf + actual_rbw_x10*1000) / TXCO_DIV3) * TXCO_DIV3;
if (tf + actual_rbw_x10*1000 >= lf && tf < lf + actual_rbw_x10*1000) // 10MHz
ADF4351_R_counter(4); // To avoid PLL Loop shoulders at multiple of 10MHz
ADF4351_R_counter(2); // To avoid PLL Loop shoulders at multiple of 10MHz
else
ADF4351_R_counter(3); // To avoid PLL Loop shoulders
} else
ADF4351_R_counter(1);
} else
ADF4351_R_counter(1);
}
} else { // Input above 800 MHz
if (local_modulo == 0) {
// if (actual_rbw_x10 >= 3000)
@ -4191,7 +4175,7 @@ again: // Spur redu
} else
target_f = local_IF+lf; // otherwise to above IF
#endif
if (setting.harmonic && lf > ULTRA_MAX_FREQ) {
if (setting.harmonic && lf > ( setting.mode == M_GENLOW ? ULTRA_MAX_FREQ + 60000000:ULTRA_MAX_FREQ) ) {
target_f /= setting.harmonic;
LO_harmonic = true;
}

2
si4468.c
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@ -66,7 +66,7 @@
#else
// On 48M MCU STM32_PCLK2 = 48M, SPI = 48M/2 = 24M
//#define SI4432_SPI_SPEED SPI_BR_DIV2
#define SI4432_SPI_SPEED SPI_BR_DIV8
#define SI4432_SPI_SPEED SPI_BR_DIV4
#endif

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