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Ojisankoubou SDR-3, Operating Manual

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Ojisankoubou SDR-3 Operating Manual Download Page 20

19

３

-

５

. Tranceiver     TX digital signal processing Weaver

Weaver method

D/A

+12kHz

+1500Hz

LPF fc=1300

-1500Hz

LPF fc=1300

0

0

12k

0

0

0

A/D

The right picture is the principle block 
diagram,
The lower right is the block diagram actually 
made.

In the Weaver method, it is interesting to 
see how spectrum changes as frequency 
conversion is repeated.

A/D

D/A

fs=48kHz

Freq conv

+1500Hz

IIR 8 order
LPF

IIR 8 order
LPF

Freq conv

-1500Hz

Freq conv

+12kHz

IIR 6 order
LPF

2.FILTER

4.LPF

5.-1500

7.DAC

1.ADC

3.+1500

6.+12k

Summary of Contents for SDR-3

Page 1: ...0 2018 Aug 15 version 1 00 Ojisankoubou c 2018 Ojisankoubou All Rights Reserved SDR 3 SSB transceiver experiment kit Operating manual...

Page 2: ...e that can be used in general purpose The one exemplified as being able to make with this kit shows the possibility of this kit I did not actually make all of the exemplifications Characteristics and...

Page 3: ...supply is recommended Those that were dropped by a transformer and then set to 5V with a series regulator is OK Please drop the noise sufficiently when using the switching regulator Speaker with ampl...

Page 4: ...n 12k 6k SW 6 7 Spectrum display during signal processing RE 1 1 Frequency 2 Menu item selection 3 Cursor A click 1 Frequency step 2 Move the cursor to the peak RE 2 1 Volume 2 Change menu setting val...

Page 5: ...ng Press SW1 Long press SW1 Long Press SW1Long Press SW1 SW1 SW1 Power ON Menu Write Memory Menu SW1 SW1 SW1Long Press SW1 SW1Long Press SW1 SW1 4 Don t retrieve Ch Memory SW5 8 Don t retrieve Setting...

Page 6: ...setting goto normal screen goto setting goto normal screen goto setting goto normal screen Long press goto function selection goto function selection goto function selection goto function selection go...

Page 7: ...teristic of BPF For details go to Chapter 5 3 Xtal Filter This is a screen for measuring the frequency characteristic of Xtal Filter There is also a function to set the center frequency of Xtal Filter...

Page 8: ...old SW2 during read mode to erase memory Press and hold SW2 to write memory SW3 band select SW4 test signal SW5 Spectrum display span select SW6 SW7 Signal processing in progress Spectrum display SW8...

Page 9: ...y so you can check changes with listening with LPF etc Press SW1 again to return to the original screen 1 MOD Set the modulation demodulation mode 2 RX GAIN Set the input sensitivity of AUDIO CODEC IC...

Page 10: ...uring reception 6 LPF Sets the LPF cutoff frequency 7 AUDIO LO Set the low frequency tone control at reception 8 AUDIO HI Set the high frequency tone control at reception 9 HPF Sets the HPF cutoff fre...

Page 11: ...t be located in the center of head so it will be easier to hear 11 SPEANA REF Sets the Ref level of the spectrum analyzer screen 12 SSB METHOD Sets the SSB signal generation method used for transmissi...

Page 12: ...eve default setting with memory number 0 also 1 Write to memory Long press SW2 to display Memory screen Set the channel number to be written with RE1 The already written channel number turns red Unwri...

Page 13: ...ch number indication is on and the frequency display is a small font Specify the channel number to read with RE1 Press SW2 again to return to the original screen You can also go back to Menu by press...

Page 14: ...ation screen Cancel by pressing SW1 When SW4 is pressed current ch memory is deleted When deleting the memory it moves to the next ch memory number If there is no memory data exit the memory read mode...

Page 15: ...ctrum display a single spectrum appears at the center The output frequency is the frequency received when SW4 is pressed Changing the receiving frequency changes the position of the spectrum and the b...

Page 16: ...F At the transmission since the spectrum received by looping back the transmission signal is displayed on the screen you can see what kind of test signal is being output You can use this function to f...

Page 17: ...ssing 1 In both transmission and reception you can see the spectrum of the signal in the process of digital signal processing inside the microcomputer in the order of each processing When transmitting...

Page 18: ...r Weaver IIR LPF Fourth method IIR LPF ogawa method Reception is fixed by the phase method The SSB signal generation method has been regarded as three types to in the table below This time this transc...

Page 19: ...ease be aware that the frequency scale of the spectrum display changes when the sampling frequency changes When SW6 SW7 is pressed the point of view changes and the spectrum changes D A 12kHz Hilbert...

Page 20: ...is the principle block diagram The lower right is the block diagram actually made In the Weaver method it is interesting to see how spectrum changes as frequency conversion is repeated A D D A fs 48k...

Page 21: ...he principle block diagram The lower right is the block diagram actually made Unlike the phase method and the Weaver method we can see that the signal processing is very simple with the fourth method...

Page 22: ...splay changes when the sampling frequency changes When SW6 SW7 is pressed the point of view changes and the spectrum changes SSB Hilbert 127tap AGC AM AGC absolute AM Freq conv 12kHz A D FIR 31 tap fc...

Page 23: ...r Hold down any of SW5 SW8 and turn on the power the setting written in Flash will not be loaded and will default value Setting 1 1 Freq Adj Perform fine adjustment ppm unit of the transmission recept...

Page 24: ...it test on another frequency experimentally In that case please do not test with the antenna test with a dummy load Be sure to return ON when the test is finished TX frequency range limit 135700 13780...

Page 25: ...play time There is also a popup that displays only while pressing SW 9 RotEnc Dir Change the direction of rotation of the rotary encoder Depending on the parts manufacturer of the rotary encoder there...

Page 26: ...d the cursor A moves to the peak frequency and when RE2 is pressed the cursor B moves to the peak frequency 4 With SW1 the setting screen is displayed you can change various settings You can select th...

Page 27: ...cursor B moves to the peak frequency 4 With SW1 the setting screen is displayed you can change various settings You can select the setting menu item with RE1 and change the setting value with RE2 Pres...

Page 28: ...center 3 Press and hold SW2 to change the frequency of cursor A to IF1 XtalFilter center frequency 4 Press SW4 to re measure and confirm that it has the frequency characteristics as intended 5 Press...

Page 29: ...lator or the broadcast Deviation ppm frequency deviation reception frequency x 1000000 The right photo shows receiving the radio Nikkei 3945 kHz adjusted the reception frequency so that CARRIER F 0 Si...

Page 30: ...nter Please take GND from BNC connector etc 3 At this time since the test signal of 10 MHz 40 mVpp is output from CN2 adjust so that the frequency counter display will be 10MHz 4 Turn RE2 while 1 Freq...

Page 31: ...ignal 3 While 1 Freq Adj is selected rotate RE2 so that the two waveforms can be synchronized as much as possible move slowly to the left or right as much as possible with the analog oscilloscope Alth...

Page 32: ...30 lines of debug log output 3 Connect the terminal to the serial terminal and watch the log When you start the terminal software on the PC with connecting USB serial module to CN3 serial you can see...

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