Ojisankoubou SDR-3 User manual

0
2018/Aug/15 version 1.00
Ojisankoubou
(c)2018 Ojisankoubou, All Rights Reserve
SDR-3
SSB transceiver experiment kit
Operating manual

1
The latest information/software is available at the following site.
Ojisankoubou Website
http://ojisankoubou.web.fc2.com/
Transistor Gijutsu Website
http://toragi.cqpub.co.jp/
The software use in this manual is the one at the time of writing this
manual. It may be change at the point of sale.
■Information / Software Location
■Important explanation items
(Please be sure to rea through)
• Even if you suffer amage or amage irectly or in irectly by
using this kit, we will not compensate at all.
• We will not respon to exchange, warranty, refun , even if you
faile to assemble or fail in use.
• This kit aims to provi e har ware that can be use in general
purpose. The one exemplifie as being able to make with this kit
shows the possibility of this kit. I i not actually make all of the
exemplifications.
• Characteristics an performance liste in this manual, Transistor
Gijutsu magazine, website, etc. are only one pro uction example,
an not all the kits guarantee the same performance. Please be
aware that there are cases where it may be goo or ba .
• Although we are carefully esigning, there is no guarantee that
there are no serious esign errors or bugs.
• Circuits, parts, boar , software, etc. may be change without
notice.
• This manual is English translation from the japanese
version of the manual.
what the English language version of the Terms says an
Japanese language version says, then the Japanese
language version shall take prece ence.

2
□DC power supply (φ2.1 center plus 5 V)
If the noise of the power supply is larger, the performance egra e.
Transformer type CVCC power supply is recommen e .
Those that were roppe by a transformer an then set to 5V with a
series regulator, is OK.
Please rop the noise sufficiently when using the switching regulator.
□Speaker with amplifier, or hea phone
□Microphone + SW (PTT)
□2 knobs (D axis)
□Spacer, screw etc.
■Other items require for using the kit
( not inclu e in the kit )

3
SW1:
Menu isplay
Long press:
Function selection menu
SW2:
Memory rea
Long press:
1. Write memory,
2. XtalFilter center frequency (= IF1) setting
SW 3:
BAND select
SW 4:
1. TX / RX test signal
2. Measurement start / stop
SW 5:
Normal spectrum isplay
Span 12k ↔6k
SW 6 - 7:
Spectrum isplay uring
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 value
3. Test signal frequency
4. Microphone gain
5. Cursor B
click:
1. Notch frequency
Simultaneous press of SW3
an SW5:
Debug message isplay
SW8︓
TX PTT
MIC Lch : ECM(Electret Con enser Mic)
MIC Rch︓TX PTT
１-１. Operation outline 1
SW on the LCD:
TX PTT

4
SW1
SW1
SW1
SW1:
Cancel
SW4:
Write
SW1
Function Selection
Menu
Tranceiver
1.Setting
2.BPF
3.Xtal Filter
SW1
SW1 Long Press
SW1 Long press
SW1 Long Press
SW1Long Press
SW1
SW1
SW1
Power ON
Menu Write
Memory
Menu
SW1
SW1
SW1Long Press
SW1長押し
SW1Long Press
SW1長押し
SW1-4 : Don't retrieve "Ch Memory"
SW5-8 : Don't retrieve "Setting"
When you o not know where you are now,
Please press SW1 or press an hol .
Menu
SW2
Long Press
１-１. Operation outline 2

5
１-２. Operation
function selection 1.Setting
menu normal setting normal setting normal setting
RE1 select funtion frequency select menu select menu cursor A select menu cursor A select menu
RE2 volume change value change value cursor B
( difference )
change value cursor B
( difference )
change value
RE1 SW frequency step cursor A goto peak cursor A goto peak
RE2 SW notch frequency cursor B goto peak cursor B goto peak
SW1 goto function goto 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
goto function
selection
goto function
selection
goto function
selection
SW2 memory read
Long press memory write
SW3 select BAND select BAND select BAND
SW4 test signal mode start measure start measure
SW5 normal spectrum
display mode
SW6 next signal
processing spectrum
SW7 previous signal
processing spectrum
SW8 TX
SW3 & SW5 debug log debug log debug log debug log debug log debug log debug log debug log
Tranceiver 2.BPF 3.Xtal Filter

6
SSB Tranceiver
This is the main function of this kit, SSB transceiver.
When you turn on the power it starts from this screen.
For etails, go to Chapter 3
1. Setting
We will make general settings.
For etails, go to Chapter 4
2. BPF
This is a screen for measuring the frequency characteristic of BPF.
For etails, 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 to IF2 frequency.
For etails, go to Chapter 6
２-１. Function selection menu
function selection menu screen
Regar less of the screen, when you press an hol SW1, "function selection
menu screen" is isplaye .
Select function (highlight) with RE1 an press SW1 to move to the selecte
screen.

7
1. Basic operation
RE1: Frequency
RE1: Pressing RE1, then changes the frequency step
RE2: Volume change
SW1: Setting screen
SW2: Memory rea mo e
SW2: Press an hol SW2 uring rea mo e to erase memory
Press an hol SW2 to write memory
SW3: ban select
SW4: test signal
SW5: Spectrum isplay span select
SW6, SW7: Signal processing in progress Spectrum isplay
SW8: TX
３-１. Tranceiver Operation
When you turn on the power, it starts from "Tranceiver" screen.
Alternatively, select "SSB Tranceiver" from "Function selection menu screen".

8
Press SW1 to enter the setting menu.
Here you can change various settings of the transceiver.
The change settings can be save in memory (see Memory operation).
Turn RE1 to select the item, an turn RE2 to change the setting value.
When setting values are change , that setting is reflecte imme iately, so you
can check changes with listening with LPF etc.
Press SW1 again to return to the original screen.
1. MOD
Set the mo ulation / emo ulation mo e.
2. RX GAIN
Set the input sensitivity of AUDIO CODEC (IC1).
If you increase the sensitivity too much, it becomes istorte by
the strong electric fiel .
Conversely, lowering the sensitivity makes it strong against strong
electric fiel s.
3. TX GAIN
Increase the transmission output gain of AUDIO CODEC (IC1).
4. AGC
Set the AGC time constant.
メニュー画面
３-２. Tranceiver Setting 1

9
5. DENOISER
Re uce noise 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 frequency.
３-２. Tranceiver Setting 2

10
10. PSD STEREO
Set the elay time in Pseu o stereo mo e.
Changing the elay time will change the sense of stereo.
Especially when using hea phones, the soun image will not be locate
in the center of hea , 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 metho use for transmission.
· PHAS: Phase metho using Hilbert filter
· WEAV: Weaver metho
· 4TH: fourth metho (tentative name is ogawa metho )
Reception is fixe by the phase metho .
３-２. Tranceiver Setting 3

11
３-３. Tranceiver Memory write
You can save the current setting in memory.
The transmission state is not save (it will be receivr mo e when rea ing
memory later).
The memory has 100ch from 0 to 99.
Memory number 0 is the efault setting. When power is turne on, ch0
setting is retrieve .
Hol own any of SW1 to SW4 an turn on the power, the memory
setting will not be reloa e . It oes not retrieve efault setting with
memory number 0 also.
1. Write to memory
Long press SW2 to isplay "Memory screen".
Set the channel number to be written with RE1.
· The alrea y written channel number turns re .
· Unwritten channel number is white.
You can overwrite alrea y written ch.
Press SW4 to write to the specifie channel number.
When SW1 is presse , writing is cancele .
Items store in memory
freq
freqstep
ban
MOD
RX GAIN
TX GAIN
AGC
DENOISER
LPF
AUDIO LO
AUDIO HI
SSB METHOD
HPF
notchfilter
micgain
pseu o stereo
speana span
speana ref
Memory screen
A re character in icates
a channel with ata

12
2. Rea from ch memory
Press SW2 to enter Memory rea mo e.
In this mo e, the ch number in ication is on an the frequency
isplay is a small font.
Specify the channel number to rea with RE1.
Press SW2 again to return to the original screen.
You can also go back to "Menu" by pressing SW1 or by switching
BAND with SW3.
Memory rea mo e
３-３. Tranceiver Memory rea

13
3. Delete ch memory
Press an hol SW2 uring memory rea mo e to elete memory.
On the "Delete" confirmation screen,
Cancel by pressing SW1
When SW4 is presse , current ch memory is elete .
When eleting the memory, it moves to the next ch memory
number. If there is no memory ata, exit the memory rea mo e
an return to the frequency input mo e (normal mo e).
"Delete" confirmation screen
３-３. Tranceiver Memory elete

14
３-４. Tranceiver Receiver test signal
When you press SW4 at reception, a signal of the same frequency as the
reception frequency is output from the SDR-3A boar CN2.
If setting "4. Test SG" is OFF, no test signal is output.
When you are watching the receive spectrum isplay, a single spectrum
appears at the center.
The output frequency is the frequency receive when SW4 is presse . Changing
the receiving frequency changes the position of the spectrum, an the beat
soun is hear from the speaker.
You can use this function to fin the efective part of the receiving circuit (see
assembly manual 3-5. Operation test BPF troubleshooting).
test signal is at the center of
the spectrum screen
Receiving frequency change

15
３-４. Tranceiver Transmitter test signal
When you press SW4 at transmission, it becomes the test signal
instea of the microphone.
If setting "4. Test SG" is OFF, test signal input will not be ma e.
Pressing SW4 repeate ly changes the test signal as follows.
1. Single tone: AF1 frequency with RE2
2. Two tone: AF2 frequency with RE2
3. Tone burst: AF1 frequency with RE2
Test signal OFF
At the transmission, since the spectrum receive by looping back the
transmission signal is isplaye on the screen, you can see what kin of test
signal is being output.
· You can use this function to fin troubles of the transmitter circuit
(refer to Assembly Manual 3-8. Operation test transmission).
· When CN7(BNC) output is measure while varying AF1 frequency
with single tone, characteristics of Xtal Filter at transmission can be
measure .
· It can be use for testing when connecting a power amplifier.
transmission no MIC input
single tone test signal
two tone test signal

16
1. Press SW6, you can see next signal processing point.
2. Press SW7, you can see previous signal processing point.
3. Press SW5 to return to the efault spectrum screen.
３-５. Tranceiver TX/RX igital signal processing 1
In both transmission an reception, you can see the spectrum of the signal in the
process of igital signal processing insi e the microcomputer in the or er of
each processing.
When transmitting, the input signal can be MIC or a transmission test signal.
You can un erstan igital signal processing eeply by seeing how the spectrum
changes by changing the mo ulation metho an changing the filter.

17
３-５. Tranceiver TX/RX igital signal processing 2
Analog Digital example
①Filter 〇 × Xtal Filter
②Phase △ 〇 PSN、Hilbert Filter
③Weaver × 〇 IIR LPF
④Fourth metho × 〇 IIR LPF
（ogawa metho ）
Reception is fixe by the ②phase metho .
The SSB signal generation metho has been regar e as three types ①to ③in the table
below.
This time, this transceiver is equippe with three types of ②~ ④, inclu ing the fourth metho
of ④, an it can be switche by menu (12. SSB METHOD).

18
Phase metho
３-５. Tranceiver TX igital signal processing Phase
The right picture is the principle block
iagram,
The lower right is the block iagram actually
ma e.
While changing the sampling frequency or
filtering in the mi le, basic signal
processing remains as it is in the principle
block iagram.
Please be aware that the frequency scale of
the spectrum isplay changes when the
sampling frequency changes.
When SW6, SW7 is presse ,
the point of view changes
an the spectrum changes.
D/A
+12kHz
Hilbert
elay
0 0 0 12k
A/D
Freq conv.
+12kHz
A/D FIR 31 tap
fc=3kHz
Hilbert
127 tap
ownsampling
fs:48k→12k
D/A
upsampling
fs:12k→48k
fs=48kHz fs=48kHz
fs=12kHz
IIR 6 or er
LPF
64tapDelay
FIR 31 tap
fc=3kHz
The ifference
between 6 an 7,
6 is I/Q,
7 is I only.
1.ADC
2.fs=12k
3.FILTER 4.MOD
5.fs=48k 6.+12k 7.DAC

19
３-５. Tranceiver TX igital signal processing Weaver
Weaver metho
D/A
+12kHz+1500Hz LPF fc=1300 -1500Hz
LPF fc=1300
00 12k 000
A/D
The right picture is the principle block
iagram,
The lower right is the block iagram actually
ma e.
In the Weaver metho , it is interesting to
see how spectrum changes as frequency
conversion is repeate .
A/D D/A
fs=48kHz
Freq conv
+1500Hz
IIR 8 or er
LPF
IIR 8 or er
LPF
Freq conv
-1500Hz
Freq conv
+12kHz
IIR 6 or er
LPF
2.FILTER
4.LPF 5.-1500
7.DAC
1.ADC 3.+1500 6.+12k