kopia lustrzana https://github.com/threeme3/usdx
Minor changes. Simplified init values. Changed to 1st order CIC up-sampler. Fix param initiatalisation.
guido
rodzic
61ad30ba1e
commit
1823683c59
111
QCX-SSB.ino
111
QCX-SSB.ino
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@ -1,11 +1,10 @@
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// QCX-SSB.ino - https://github.com/threeme3/QCX-SSB
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//
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// Copyright 2019 pe1nnz@amsat.org
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// Copyright 2019 Guido PE1NNZ <pe1nnz@amsat.org>
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#define VERSION "1.01p"
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#define VERSION "1.01q"
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/* BACKLOG:
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code definitions and re-use for comb, integrator, dc decoupling, arctan
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@ -27,7 +26,7 @@ VFO-A/B+split+RIT
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OLED display support
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VOX integration in main loop
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auto-bias for AUDIO1+2 inputs
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crystal freqs in menu
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K2/TS480 CAT
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*/
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// QCX pin defintion
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@ -59,7 +58,6 @@ crystal freqs in menu
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class LCD : public Print { // inspired by: http://www.technoblogy.com/show?2BET
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public: // LCD1602 display in 4-bit mode, RS is pull-up and kept low when idle to prevent potential display RFI via RS line
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// Pin definitions
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#define _dn 0 // PD0 to PD3 connect to D4 to D7 on the display
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#define _en 4 // PC4 - MUST have pull-up resistor
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#define _rs 4 // PC4 - MUST have pull-up resistor
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@ -270,7 +268,7 @@ public:
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#define SI_CLK_IDRV_8MA 0b00000011
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#define SI_CLK_INV 0b00010000
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#define SI_PLL_FREQ 400000000 //900000000, with 400MHz PLL freq, usable range is 3.2..100MHz
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volatile uint32_t fxtal = 27004900; //#define fxtal 27004900 myqcx1:27003847 myqcx2:27004900 Measured crystal frequency of XTAL2 for CL = 10pF (default), calibrate your QCX 27MHz crystal frequency here
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volatile uint32_t fxtal = 27004300; //myqcx1:27003847 myqcx2:27004900 Actual crystal frequency of 27MHz XTAL2 for CL = 10pF (default), calibrate your QCX 27MHz crystal frequency here
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volatile uint8_t prev_divider;
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volatile int32_t raw_freq;
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@ -456,7 +454,7 @@ public:
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static SI5351 si5351;
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#undef F_CPU
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#define F_CPU 20008440 // myqcx1:20008440 // Actual crystal frequency of XTAL1 20000000
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#define F_CPU 20007000 // myqcx1:20008440, myqcx2:20006000 // Actual crystal frequency of 20MHz XTAL1
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volatile uint16_t param_a = 0; // registers for debugging, testing and experimental purposes
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volatile int16_t param_b = 0;
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@ -678,13 +676,13 @@ volatile bool cw_event = false;
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//#define F_SAMP_RX 34722
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//#define F_SAMP_RX 31250
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//#define F_SAMP_RX 28409
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#define F_ADC_CONV 192307
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#define F_ADC_CONV (192307/1)
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volatile int8_t volume = 0;
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volatile bool agc = true;
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volatile uint8_t nr = 0;
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volatile uint8_t att = 0;
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volatile uint8_t att2 = 0;
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volatile uint8_t att2 = 2;
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volatile uint8_t _init;
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//static uint32_t gain = 1024;
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@ -865,11 +863,11 @@ void sdr_rx()
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v[7] = ac2 >> att2;
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i = v[0]; v[0] = v[1]; v[1] = v[2]; v[2] = v[3]; v[3] = v[4]; v[4] = v[5]; v[5] = v[6]; v[6] = v[7]; // Delay to match Hilbert transform on Q branch
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int16_t ac = i + qh;
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static uint8_t absavg256cnt;
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if(!(absavg256cnt--)){ _absavg256 = absavg256; absavg256 = 0; } else absavg256 += abs(ac);
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if(mode == AM) { // (12%CPU for the mode selection etc)
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{ static int16_t dc;
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dc += (i - dc) / 2;
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@ -917,9 +915,14 @@ void sdr_rx()
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// Output stage
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static int16_t ozd1, ozd2;
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if(_init){ ac = 0; ozd1 = 0; ozd2 = 0; _init = 0; } // hack: on first sample init accumlators of further stages (to prevent instability)
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//#define SECOND_ORDER_DUC 1
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#ifdef SECOND_ORDER_DUC
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int16_t od1 = ac - ozd1; // Comb section
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ocomb = od1 - ozd2;
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ozd2 = od1;
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#else
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ocomb = ac - ozd1; // Comb section
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#endif
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ozd1 = ac;
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}
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} else _z1 = _ac * 2;
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@ -935,7 +938,9 @@ void sdr_rx_2()
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ADCSRA |= (1 << ADSC); // start next ADC conversion
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int16_t adc = ADC - 512; // current ADC sample 10-bits analog input, NOTE: first ADCL, then ADCH
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func_ptr = sdr_rx; // processing function for next conversion
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//sdr_rx_common();
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#ifdef SECOND_ORDER_DUC
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sdr_rx_common(); //necessary? YES!
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#endif
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static int16_t dc;
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dc += (adc - dc) / 2;
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@ -976,10 +981,16 @@ inline void sdr_rx_common()
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static int16_t ozi1, ozi2;
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if(_init){ ocomb=0; ozi1 = 0; ozi2 = 0; } // hack
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// Output stage [25% CPU@R=4;Fs=62.5k]
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ozi2 = ozi1 + ozi2; // Integrator section
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#ifdef SECOND_ORDER_DUC
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ozi2 = ozi1 + ozi2; // Integrator section
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#endif
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ozi1 = ocomb + ozi1;
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#ifndef PROFILING
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#ifdef SECOND_ORDER_DUC
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if(volume) OCR1AL = min(max((ozi2>>5) + 128, 0), 255); //if(volume) OCR1AL = min(max((ozi2>>5) + ICR1L/2, 0), ICR1L); // center and clip wrt PWM working range
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#else
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if(volume) OCR1AL = min(max((ozi1>>5) + 128, 0), 255); //if(volume) OCR1AL = min(max((ozi2>>5) + ICR1L/2, 0), ICR1L); // center and clip wrt PWM working range
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#endif
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#endif
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}
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@ -1209,7 +1220,7 @@ float smeter(float ref = 5.1) //= 10*log(F_SAMP_RX/R/2400) ref to 2.4kHz BW.
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if(smode == 0){ // none, no s-meter
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return 0;
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}
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float rms = _absavg256 / 256; //sqrt(256.0);
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float rms = _absavg256 / 256.0; //sqrt(256.0);
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if(dsp_cap == SDR) rms = (float)rms * 1.1 * (float)(1 << att2) / (1024.0 * (float)R * 100.0 * 50.0); // rmsV = ADC value * AREF / [ADC DR * processing gain * receiver gain * audio gain]
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else rms = (float)rms * 5.0 * (float)(1 << att2) / (1024.0 * (float)R * 100.0 * 120.0 / 1.750);
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float dbm = (10.0 * log10((rms * rms) / 50.0) + 30.0) - ref; //from rmsV to dBm at 50R
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@ -1548,8 +1559,8 @@ uint8_t eeprom_version;
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int eeprom_addr;
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// Support functions for parameter and menu handling
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enum action_t { UPDATE, UPDATE_MENU, LOAD, SAVE, SKIP, INIT };
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template<typename T> void paramAction(uint8_t action, T& value, const __FlashStringHelper* menuid, const __FlashStringHelper* label, const char* enumArray[], int32_t _min, int32_t _max, bool continuous, int32_t init_val){
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enum action_t { UPDATE, UPDATE_MENU, LOAD, SAVE, SKIP };
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template<typename T> void paramAction(uint8_t action, T& value, const __FlashStringHelper* menuid, const __FlashStringHelper* label, const char* enumArray[], int32_t _min, int32_t _max, bool continuous){
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switch(action){
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case UPDATE:
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case UPDATE_MENU:
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@ -1584,16 +1595,15 @@ template<typename T> void paramAction(uint8_t action, T& value, const __FlashStr
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case SKIP:
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eeprom_addr += sizeof(value);
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break;
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case INIT:
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value = init_val;
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break;
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}
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}
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const char* offon_label[2] = {"OFF", "ON"};
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const char* mode_label[5] = { "LSB", "USB", "CW ", "AM ", "FM " };
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const char* filt_label[7] = { "Full", "4000", "2500", "1700", "200", "100", "50" };
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const char* band_label[N_BANDS] = { /*"600", "160m",*/ "80m", "60m", "40m", "30m", "20m", "17m", "15m", "12m", "10m", "6m", "4m" /*, "2m"*/};
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const char* band_label[N_BANDS] = { "80m", "60m", "40m", "30m", "20m", "17m", "15m", "12m", "10m", "6m", "4m" };
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#define _N(a) sizeof(a)/sizeof(a[0])
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#define N_PARAMS 19 // number of (visible) parameters
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#define N_ALL_PARAMS (N_PARAMS+2) // number of parameters
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@ -1613,28 +1623,28 @@ void paramAction(uint8_t action, uint8_t id = ALL) // list of parameters
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const char* smode_label[4] = { "OFF", "dBm", "S", "S-bar" };
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switch(id){
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// Visible parameters
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case VOLUME: paramAction(action, volume, F("1.1"), F("Volume"), NULL, -1, 16, false, ((dsp_cap) ? ((dsp_cap == SDR) ? 8 : 10) : 0)); break;
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case MODE: paramAction(action, mode, F("1.2"), F("Mode"), mode_label, 0, sizeof(mode_label)/sizeof(char*) - 1, true, USB); break;
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case FILTER: paramAction(action, filt, F("1.3"), F("Filter BW"), filt_label, 0, sizeof(filt_label)/sizeof(char*) - 1, false, 0); break;
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case BAND: paramAction(action, bandval, F("1.4"), F("Band"), band_label, 0, sizeof(band_label)/sizeof(char*) - 1, false, 1); break;
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case STEP: paramAction(action, stepsize, F("1.5"), F("Tune Rate"), stepsize_label, 0, sizeof(stepsize_label)/sizeof(char*) - 1, false, STEP_1k); break;
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case AGC: paramAction(action, agc, F("1.6"), F("AGC"), offon_label, 0, 1, false, true); break;
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case NR: paramAction(action, nr, F("1.7"), F("NR"), NULL, 0, 8, false, 0); break;
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case ATT: paramAction(action, att, F("1.8"), F("ATT"), att_label, 0, 7, false, 0); break;
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case ATT2: paramAction(action, att2, F("1.9"), F("ATT2"), NULL, 0, 16, false, 2); break;
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case SMETER: paramAction(action, smode, F("1.10"), F("S-meter"), smode_label, 0, sizeof(smode_label)/sizeof(char*) - 1, false, 1); break;
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case CWDEC: paramAction(action, cwdec, F("2.1"), F("CW Decoder"), offon_label, 0, 1, false, false); break;
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case VOX: paramAction(action, vox, F("3.1"), F("VOX"), offon_label, 0, 1, false, false); break;
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case VOXGAIN: paramAction(action, vox_thresh, F("3.2"), F("VOX Level"), NULL, 0, 255, false, (1<<2) ); break;
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case MOX: paramAction(action, mox, F("3.3"), F("MOX"), NULL, 0, 4, false, false); break;
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case DRIVE: paramAction(action, drive, F("3.4"), F("TX Drive"), NULL, 0, 8, false, 4); break;
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case SIFXTAL: paramAction(action, si5351.fxtal, F("9.1"), F("Ref freq"), NULL, 24000000, 28000000, false, 27004000); break;
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case PARAM_A: paramAction(action, param_a, F("9.2"), F("Param A"), NULL, 0, 65535, false, 0); break;
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case PARAM_B: paramAction(action, param_b, F("9.3"), F("Param B"), NULL, -32768, 32767, false, 0); break;
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case PARAM_C: paramAction(action, param_c, F("9.4"), F("Param C"), NULL, -32768, 32767, false, 0); break;
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case VOLUME: paramAction(action, volume, F("1.1"), F("Volume"), NULL, -1, 16, false); break;
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case MODE: paramAction(action, mode, F("1.2"), F("Mode"), mode_label, 0, _N(mode_label) - 1, true); break;
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case FILTER: paramAction(action, filt, F("1.3"), F("Filter BW"), filt_label, 0, _N(filt_label) - 1, false); break;
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case BAND: paramAction(action, bandval, F("1.4"), F("Band"), band_label, 0, _N(band_label) - 1, false); break;
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case STEP: paramAction(action, stepsize, F("1.5"), F("Tune Rate"), stepsize_label, 0, _N(stepsize_label) - 1, false); break;
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case AGC: paramAction(action, agc, F("1.6"), F("AGC"), offon_label, 0, 1, false); break;
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case NR: paramAction(action, nr, F("1.7"), F("NR"), NULL, 0, 8, false); break;
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case ATT: paramAction(action, att, F("1.8"), F("ATT"), att_label, 0, 7, false); break;
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case ATT2: paramAction(action, att2, F("1.9"), F("ATT2"), NULL, 0, 16, false); break;
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case SMETER: paramAction(action, smode, F("1.10"), F("S-meter"), smode_label, 0, _N(smode_label) - 1, false); break;
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case CWDEC: paramAction(action, cwdec, F("2.1"), F("CW Decoder"), offon_label, 0, 1, false); break;
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case VOX: paramAction(action, vox, F("3.1"), F("VOX"), offon_label, 0, 1, false); break;
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case VOXGAIN: paramAction(action, vox_thresh, F("3.2"), F("VOX Level"), NULL, 0, 255, false); break;
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case MOX: paramAction(action, mox, F("3.3"), F("MOX"), NULL, 0, 4, false); break;
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case DRIVE: paramAction(action, drive, F("3.4"), F("TX Drive"), NULL, 0, 8, false); break;
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case SIFXTAL: paramAction(action, si5351.fxtal, F("9.1"), F("Ref freq"), NULL, 24000000, 28000000, false); break;
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case PARAM_A: paramAction(action, param_a, F("9.2"), F("Param A"), NULL, 0, 65535, false); break;
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case PARAM_B: paramAction(action, param_b, F("9.3"), F("Param B"), NULL, -32768, 32767, false); break;
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case PARAM_C: paramAction(action, param_c, F("9.4"), F("Param C"), NULL, -32768, 32767, false); break;
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// Invisible parameters
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case FREQ: paramAction(action, freq, NULL, NULL, NULL, 0, 0, false, 7074000); break;
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case VERS: paramAction(action, eeprom_version, NULL, NULL, NULL, 0, 0, false, get_version_id()); break;
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case FREQ: paramAction(action, freq, NULL, NULL, NULL, 0, 0, false); break;
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case VERS: paramAction(action, eeprom_version, NULL, NULL, NULL, 0, 0, false); break;
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}
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}
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@ -1843,14 +1853,17 @@ void setup()
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delay(1500); wdt_reset();
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}
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#endif
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volume = (dsp_cap) ? ((dsp_cap == SDR) ? 8 : 10) : 0; // default volume: keep volume disabled for analog rig
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// Load parameters from EEPROM, reset to factory defaults when stored values are from a different version
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paramAction(LOAD);
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if(get_version_id() != eeprom_version){
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paramAction(INIT);
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paramAction(LOAD, VERS);
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if(eeprom_version == get_version_id()){ // version signature in EEPROM corresponds with this firmware?
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paramAction(LOAD); // load all parameters
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} else {
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eeprom_version = get_version_id();
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//for(int n = 0; n != 1024; n++){ eeprom_write_byte((uint8_t *) n, 0); wdt_reset(); } //clean EEPROM
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//eeprom_write_dword((uint32_t *)EEPROM_OFFSET/3, 0x000000);
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paramAction(SAVE);
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paramAction(SAVE); // save default parfameter values
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lcd.setCursor(0, 1); lcd.print(F("Reset settings.."));
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delay(500); wdt_reset();
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}
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@ -1860,18 +1873,16 @@ void setup()
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show_banner(); // remove release number
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if(!dsp_cap) volume = 0; // keep volume disabled for analog rig
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start_rx();
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}
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void loop()
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{
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{
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delay(10);
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if(menumode == 0){
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smeter();
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if(mode != CW) stepsize_showcursor();
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if(!((mode == CW) && cw_event)) stepsize_showcursor();
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}
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if(mode == CW && cw_event){
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@ -1939,7 +1950,7 @@ void loop()
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case BR|SC:
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if(!menumode){
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encoder_val = 1;
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paramAction(UPDATE, MODE); // Mode param //paramAction(UPDATE, mode, NULL, F("Mode"), mode_label, 0, sizeof(mode_label)/sizeof(char*), true);
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paramAction(UPDATE, MODE); // Mode param //paramAction(UPDATE, mode, NULL, F("Mode"), mode_label, 0, _N(mode_label), true);
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if(mode != CW) stepsize = STEP_1k; else stepsize = STEP_100;
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//if(mode > FM) mode = LSB;
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if(mode > CW) mode = LSB; // skip all other modes (only LSB, USB, CW)
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19
README.md
19
README.md
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@ -32,18 +32,18 @@ pe1nnz@amsat.org
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- An **pre-distorion** algorithm that cancels out the amplitude errors of non-linearities in the PA voltage regulated PWM supply; a lookup table is used that can be calibrated with an internal PA amplitude measurement
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- Possibility to extend the QCX analog phasing stage with a **DSP stage**
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- Could replace the QCX analog phasing stage completely with a **digital SDR receiver stage**, taking away the need for the manual side-band rejection adjustment procedure and delivering DSP features such as the joy of having a **AGC, adjustable CW/SSB filters**
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- A theoretical **digital receiver dynamic range of 78dB** at 2.4kHz BW. (1 dB) Compression point (at -126dBm sensitivity): -44dBm/1mV (for in-band signal); -4dBm/160mV (for signal at 15kHz offset); 19dBm/2V (for signal at 100kHz offset or more)
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- **Receiver MDS of -118dBm @2.4kHz BW; dynamic range of 78dB**. Blocking (after reducing gain IC6A/B-stage to 10dB!!): -48dBm@5kHz, -8dBm@15kHz
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- Digitally switchable RF front-end **attenuators (0dB, -13dB, -20dB, -33dB, -53dB, -60dB, -73dB)**
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- This firmware is compatible with an unmodified QCX, partial modified QCX (e.g. SSB mod, or DSP mod), or fully modified QCX (SSB + SDR mod, as described below)
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- SDR implementation simplifies the receiver heaviliy and **shaves off roughly 30% of the components** from the original QCX design while adding new and improving existing features. On a new QCX build: 46 components less to be installed, 8 component design changes, 9 additional wires.
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- SDR implementation simplifies the receiver heaviliy; **the original QCX PCB is now half empty** by moving the analog processing into the microcontroller and adding new and improving existing features. On a new QCX build: 46 components less to be installed, 8 component design changes, 9 additional wires.
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- Probably the most cost effective and easiest to build standalone SDR transceiver that you can find. More versatile and easier to build than the original QCX (less components, no transformer windings, no alignment procedure)
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## Revision History:
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| Rev. | Date | Features |
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| ----- | ---------- | ------------------------------------------------------------------- |
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| R1.02 (current) | 2019-09-01 | Integrated SDR receiver, CW decoder, DSP filters, AGC, NR, ATT, experimental modes CW, AM, FM, quick menu, persistent settings. |
|
||||
| R1.01 | 2019-05-05 | Q6 now digitally switched (remove C31) - improving stability and IMD. Improved signal processing, audio quality, increased bandwidth, cosmetic changes and reduced RF feedback, reduced s-meter RFI, S-meter readings, self-test on startup. Receiver I/Q calibration, (experimental) amplitude pre-distortion and calibration. |
|
||||
| R1.02 (**this**) | 2019-09-01 | Integrated SDR receiver, CW decoder, DSP filters, AGC, NR, ATT, experimental modes CW, AM, FM, quick menu, persistent settings. |
|
||||
| R1.01d | 2019-05-05 | Q6 now digitally switched (remove C31) - improving stability and IMD. Improved signal processing, audio quality, increased bandwidth, cosmetic changes and reduced RF feedback, reduced s-meter RFI, S-meter readings, self-test on startup. Receiver I/Q calibration, (experimental) amplitude pre-distortion and calibration. |
|
||||
| R1.00 | 2019-01-29 | Initial release of SSB transceiver prototype. |
|
||||
|
||||
|
||||
|
|
@ -66,10 +66,10 @@ Change the following component values (and type of component in some cases), and
|
|||
5. Connect an electret microphone pins (+) to tip and (-) to sleeve of paddle-jack; PTT-switch pins to ring and sleeve (see [X1M-mic]).
|
||||
|
||||
|
||||
Below the layout with components marked in red that needs to be changed; gray components must be installed and blank components must either be removed or may be omitted (see above):
|
||||
Below the layout with components marked in red that needs to be changed; gray components must be installed and blank components may be omitted and some must be remove (see above):
|
||||
|
||||
|
||||
Below the wires that needs to be installed on the bottom PCB; a circle indicates that the component pin is disconnected from the pad and connected to another pad via a wire (feed through the PCB, or wired on the top side):
|
||||
Below the wires that needs to be installed on the bottom PCB; a circle indicates that the component pin is disconnected from the PCB pad and directly wired to another pad (the wire may be fed through the PCB hole or wired on the top side):
|
||||
|
||||
|
||||
|
||||
|
|
@ -78,7 +78,7 @@ Currently, the following functions have been assigned to the buttons:
|
|||
|
||||
| Button | Function |
|
||||
| ------------------- | ------------------------------------------------------- |
|
||||
| LEFT single-press | Select menu-item, setting or goes back |
|
||||
| LEFT single-press | Selects menu-item, setting or goes back (optional: CENTER, RIGHT click) |
|
||||
| LEFT double-press | |
|
||||
| LEFT long-press | |
|
||||
| LEFT push + turn | Quick menu |
|
||||
|
|
@ -147,12 +147,13 @@ The following performance measurements were made with QCX-SSB R1.01, a modified
|
|||
|
||||
|
||||
### Credits:
|
||||
[QCX] (QRP Labs CW Xcvr) is a kit designed by _Hans Summers (G0UPL)_, originally built for RSGB's YOTA summer camp 2017, a high performance, image rejecting DC transceiver; basically a simplified implementation of the [NorCal 2030] by _Dan Tayloe (N7VE)_ designed in 2004 combined with a [Hi-Per-Mite] Active Audio CW Filter by _David Cripe (NMØS)_, [Low Pass Filters] from _Ed (W3NQN)_ 1983 Articles, a key-shaping circuit by _Donald Huff (W6JL)_, a BS170 switched [CMOS driven MOSFET PA] stage like the famous [ATS] designs by _Steven Weber (KD1JV)_ (originating from the [Power MOSFET revolution] in the mid 70s), and combined with popular components such as Atmel [ATMEGA328P] microprocessor, a Hitachi [HD44780] LCD display and a Silicon Labs [SI5351] Clock Generator (and using a [phase shift in the SI5351 clocks]). The [QCX-SSB] hardware modification and its Arduino [QCX-SSB Sketch] is designed by _Guido (PE1NNZ)_; the software-based SSB transmit stage is a derivate of earlier experiments with a [digital SSB generation technique] on a Raspberry Pi.
|
||||
|
||||
[QCX] (QRP Labs CW Xcvr) is a kit designed by _Hans Summers (G0UPL)_, originally built for RSGB's YOTA summer camp 2017, a high performance, image rejecting DC transceiver; basically a simplified implementation of the [NorCal 2030] by _Dan Tayloe (N7VE)_ designed in 2004 combined with a [Hi-Per-Mite] Active Audio CW Filter by _David Cripe (NMØS)_, [Low Pass Filters] from _Ed (W3NQN)_ 1983 Articles, a key-shaping circuit by _Donald Huff (W6JL)_, a BS170 switched [CMOS driven MOSFET PA] architecture as used in the [ATS] designs by _Steven Weber (KD1JV)_ (originating from the [Power MOSFET revolution] in the mid 70s), and combined with popular components such as Atmel [ATMEGA328P] microprocessor, a Hitachi [HD44780] LCD display and a Silicon Labs [SI5351] Clock Generator (and using a [phase shift in the SI5351 clocks]). The [QCX-SSB] hardware modification and its Arduino [QCX-SSB Sketch] is designed by _Guido (PE1NNZ)_; the software-based SSB transmit stage is a derivate of earlier experiments with a [digital SSB generation technique] on a Raspberry Pi.
|
||||
|
||||
<!---
|
||||
### References
|
||||
- VERON association interviewed me in the [PI4AA June issue] about this project (in Dutch, starting at timestamp 15:50).
|
||||
- Rüdiger Möller, HPSDR presentation by [DJ1MR], 2018. Transmitter architectures for high efficiency amplification
|
||||
--->
|
||||
|
||||
[original schematic]: https://qrp-labs.com/images/qcx/HiRes.png
|
||||
|
||||
|
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|
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Ładowanie…
Reference in New Issue