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Ojisankoubou SDR-3 Operating Manual

Ssb transceiver experiment kit
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SDR-3
SSB transceiver experiment kit
Operating manual
2018/Aug/15 version 1.00
Ojisankoubou
(c)2018 Ojisankoubou, All Rights Reserved

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Summary of Contents for Ojisankoubou SDR-3

  • Page 1 SDR-3 SSB transceiver experiment kit Operating manual 2018/Aug/15 version 1.00 Ojisankoubou (c)2018 Ojisankoubou, All Rights Reserved...
  • Page 2 (Please be sure to read through) The latest information/software is available at the following site. • Even if you suffer damage or damage directly or indirectly by Ojisankoubou Website using this kit, we will not compensate at all. http://ojisankoubou.web.fc2.com/ Transistor Gijutsu Website •...
  • Page 3 ■ Other items required for using the kit ( not included in the kit ) □ DC power supply (φ2.1 center plus 5 V) If the noise of the power supply is larger, the performance degrade. Transformer type CVCC power supply is recommended. Those that were dropped by a transformer and then set to 5V with a series regulator, is OK.

  • Page 4: Operation Outline

    １-１. Operation outline SW1: SW2: Menu display Memory read Long press: Long press: Function selection menu 1. Write memory, 2. XtalFilter center frequency (= IF1) setting RE 1: SW 3: 1. Frequency BAND select 2. Menu item selection SW on the LCD: 3.
  • Page 5 １-１. Operation outline Power ON SW1Long Press Menu SW1-4 : Don't retrieve "Ch Memory" SW5-8 : Don't retrieve "Setting" SW1Long Press Function Selection 3.Xtal Filter Menu SW1 Long Press SW1 Long Press SW1 Long press 2.BPF Tranceiver SW4: 1.Setting Write SW1: SW1Long Press Cancel...

  • Page 6: Operation

    １-２. Operation function selection Tranceiver 1.Setting 2.BPF 3.Xtal Filter menu normal setting normal setting normal setting select funtion frequency select menu select menu cursor A select menu cursor A select menu volume change value change value cursor B change value cursor B change value ( difference )
  • Page 7 ２-１. Function selection menu function selection menu screen Regardless of the screen, when you press and hold SW1, "function selection menu screen" is displayed. Select function (highlight) with RE1 and press SW1 to move to the selected screen. SSB Tranceiver This is the main function of this kit, SSB transceiver.
  • Page 8 ３-１. Tranceiver Operation When you turn on the power, it starts from "Tranceiver" screen. Alternatively, select "SSB Tranceiver" from "Function selection menu screen". 1. Basic operation RE1: Frequency RE1: Pressing RE1, then changes the frequency step RE2: Volume change SW1: Setting screen SW2: Memory read mode SW2: Press and hold SW2 during read mode to erase memory Press and hold SW2 to write memory...
  • Page 9 ３-２. Tranceiver Setting 1 メニュー画面 Press SW1 to enter the setting menu. Here you can change various settings of the transceiver. The changed settings can be saved in memory (see Memory operation). Turn RE1 to select the item, and turn RE2 to change the setting value. When setting values are changed, that setting is reflected immediately, so you can check changes with listening with LPF etc.
  • Page 10 ３-２. Tranceiver Setting 2 5. DENOISER Reduce noise during 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 frequency.
  • Page 11 ３-２. Tranceiver Setting 3 10. PSD STEREO Set the delay time in Pseudo stereo mode. Changing the delay time will change the sense of stereo. Especially when using headphones, the sound image will not be located in the center of head, so it will be easier to hear. 11.
  • Page 12 ３-３. Tranceiver Memory write Items stored in memory You can save the current setting in memory. The transmission state is not saved (it will be receivr mode when reading freq memory later). freqstep band The memory has 100ch from 0 to 99. RX GAIN Memory number 0 is the default setting.
  • Page 13 ３-３. Tranceiver Memory read 2. Read from ch memory Press SW2 to enter Memory read mode. Memory read mode In this mode, the 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.
  • Page 14 ３-３. Tranceiver Memory delete 3. Delete ch memory Press and hold SW2 during memory read mode to delete memory. "Delete" confirmation screen On the "Delete" confirmation 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.
  • Page 15 ３-４. Tranceiver Receiver test signal test signal is at the center of When you press SW4 at reception, a signal of the same frequency as the reception frequency is output from the SDR-3A board CN2. the spectrum screen If setting "4. Test SG" is OFF, no test signal is output. When you are watching the received spectrum display, a single spectrum appears at the center.
  • Page 16 ３-４. Tranceiver Transmitter test signal transmission no MIC input When you press SW4 at transmission, it becomes the test signal instead of the microphone. If setting "4. Test SG" is OFF, test signal input will not be made. Pressing SW4 repeatedly changes the test signal as follows. 1.
  • Page 17 ３-５. Tranceiver TX/RX digital signal processing 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. 1. Press SW6, you can see next signal processing point. 2.
  • Page 18 ３-５. Tranceiver TX/RX digital signal processing 2 The SSB signal generation method has been regarded as three types ① to ③ in the table below. This time, this transceiver is equipped with three types of ② ~ ④, including the fourth method of ④, and it can be switched by menu (12.
  • Page 19 ３-５. Tranceiver TX digital signal processing Phase Phase method The right picture is the principle block diagram, Hilbert The lower right is the block diagram actually +12kHz made. delay While changing the sampling frequency or filtering in the middle, basic signal processing remains as it is in the principle block diagram.
  • Page 20 ３-５. Tranceiver TX digital signal processing Weaver Weaver method LPF fc=1300 The right picture is the principle block +1500Hz -1500Hz +12kHz diagram, LPF fc=1300 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.
  • Page 21 ３-５. Tranceiver TX digital signal processing Fourth method Fourth method（ogawa method） LPF fc=11.8k +12kHz The right picture is the principle block LPF fc=11.8k 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 ３-５. Tranceiver RX digital signal processing Reception is fixed by the phase method. Please 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. fs=48kHz fs=48kHz fs=12kHz...
  • Page 23 ４-１. Setting Select "Setting" from "Function selection menu" screen. Setting screen You can change the item with RE1, and change the value of each item with RE2. The changed value is written to the Flash memory when you press and hold SW1 and return to the "function selection menu screen"...
  • Page 24 ４-１. Setting 4. Test SG On the "transceiver" screen, you can set whether to output the TX/RX test signal with SW4 or not. If OFF, no test signal is output Tranceiver Debug display even if SW4 is pressed. It is good to turn it OFF when the test is finished.
  • Page 25 ４-１. Setting Pop-up when changing frequency 8. Popup time Change popup display time. All pop-up display times are not the values changed here. Some pop-ups have a minimum display time. There is also a popup that displays only while pressing SW. 9.
  • Page 26 ５-１. BPF measure Function selection menu screen Select "2. BPF" from "Function selection menu screen". 1. Connect a short jumper to CN2 on the SDR-3A board. Please do not connect anything to CN7 (BNC). 2. Press SW4 to start measurement. Wait until the measurement is over.
  • Page 27 ６-１. Xtal Filter measure Function selection menu screen Select "3.Xtal Filter" from "Function selection menu" screen. 1. Connect a short jumper to CN2 on the SDR-3A board. Please do not connect anything to CN7 (BNC). 2. Press SW4 to start measurement. Wait until the measurement is over.
  • Page 28 ７-１. Xtal Filter Center frequency setting find the center frequency In XtalFilter, frequency characteristics change due to variation of crystal oscillator. If it is greatly deviated, you can change the center frequency by the following procedure. 1. Measure the Xtal Filter. 2.

  • Page 29: Frequency Adjustment

    ７-２. Frequency adjustment Setting 画面 If you are concerned about frequency error please follow the procedure below. Wait until the frequency stabilizes for a while after turning on the power supply. When this adjustment is made, the oscillation frequency changes, so it is necessary to adjust the crystal filter center frequency again.
  • Page 30 ７-２. Frequency adjustment ■ When using frequency counter 1. Press and hold SW1 and enter "Setting" from the "function selection menu". 2. Connect the closer end of CN2 on the SDR-3A board to the frequency counter. Please take GND from BNC connector etc. 3.
  • Page 31 ７-２. Frequency adjustment ■ When using a precise oscillator (10 MHz) and an analog oscilloscope, 1. Press and hold SW1 and enter "Setting" from the "function selection menu". 2. Observe the terminal on the side close to the board end of CN2 on the SDR-3A board and the output of the oscillator (10 MHz) with an analog oscilloscope.

  • Page 32: Debug Display

    ７-３. Debug display Tranceiver Debug display When something is wrong, you can check the status in the following way. 1. Debug display on the upper left of the spectrum screen It is displayed when you set "5. Debug Disp" of "Setting" to ON. Although only basic items are displayed here, it may be some hint.