Expert Electronics SunSDR2 QRP User manual

Expert Electronics
2018
SunSDR2 QRP
Hardware Manual
V1.0

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1. Precautions......................................................................................................................3
2. Technical characteristics ..................................................................................................5
3. Front and rear panel description ......................................................................................6
4. Connectors pin-out...........................................................................................................8
4.1 EXT CTRL......................................................................................................................8
4.2 MIC1 ..............................................................................................................................9
4.3 MIC2 ..............................................................................................................................9
4.4 PTT footswitch .............................................................................................................10
4.5 CW-key ........................................................................................................................10
5. Local operation ..............................................................................................................10
6. Remote operation ..........................................................................................................12
7. Default Settings .............................................................................................................12
8. Regulatory requirements................................................................................................13

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1. Precautions
To prevent damage to the transceiver, please read these operating rules carefully before
attempting to operate the transceiver.
•Carefully read this manual first, otherwise connecting and operating the SunSDR2 QRP
could lead to fatal errors;
•Visually inspect the SunSDR2 QRP transceiver for the absence of mechanic damages
before connecting it to PC;
•If the SunSDR2 QRP was stored in abnormal climatic conditions, it is recommended to
keep it in normal operating temperatures for at least 2 hours before switching on;
•Before connecting the SunSDR2 QRP to the AC power line, ensure it is grounded. Never
use the SunSDR2 QRP transceiver without grounding;
•It is forbidden to connect the SunSDR2 QRP to PC with the voltage presence on it or in
the switched condition;
•It is forbidden to use the power supply with the voltage more than +15 V.
Remember! The transceiver's power is the voltage direct current!
•Before connecting the external devices to connector EXT CTRL read the Manual, learn
tables and diagrams of connecting the external devices;
•DO NOT connect a VGA monitor to COM or CTRL port, you will damage the transceiver!
•Remember! The transistor switches have limitations of supply voltage and current, going
through them. The power swap is forbidden;
•DO NOT use the SunSDR2 QRP in temperatures lower than 0ºC (32ºF) and higher than
+75ºC (167ºF);
•It is forbidden to use and store the transceiver in the dusted rooms and on exposure to
direct sunlight;
•Avoid the exposure of the atmospheric downfalls on the SunSDR2 QRP and never spill
any liquids (especially aggressive) on it;
•It is forbidden to use the Transceiver during storms;
•Don't open the Transceiver, it has radio elements, which have high-sensitivity to the static
electricity. This document contains all necessary information about the internal design to
satisfy the Users’ curiosity. To repair the Transceiver, ask the manufacturer;
•Always disconnect the antenna from the Transceiver when not in use, or if there is a
danger of atmospheric electricity;
•Ensure the Transceiver and any connecting cables are free from the effects of
electromagnetic interference and uncontrolled currents and voltages;

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•To avoid damage to the Transceiver or causing harmful interference on air, it should only
be operated by competent HAMs;
•Keep the Transceiver out of the reach of children.

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2. Technical characteristics
General coverage receiver in HF, MHz
0.1...55
Frequency coverage in HF in TX mode, MHz
All HF and 6m amateur frequencies
Sensitivity, uV
0,1
Maximum transmitter's output power in HF, W
5
Blocking dynamic range in HF mode (BDR), dB
120
RF ADC clock frequency, MHz
122,88
RF ADC resolution, bit
16
ADC type
LTC2165
RF DAC clock frequency, MHz
122,88
RF DAC resolution, bit
14
Local oscillator's stability, ppm
16 MHz +/- 2.5 ppm
Recommended power supply, V
12
Supply voltage range, V
10...15
Maximum consumption current, А
3
Built-in audio codec resolution, bit
24
Dimensions, mm (inches)
185х106х45 (6,5”x 6,94” x 1,38”)
Operating temperature, ºC (ºF)
0(32) to +75(167)
Weight, kg (lbs)
0,8 (1,1)

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3. Front and rear panel description
Front panel of the transceiver
Table with description of controls and connectors
№
Name
Description
1.
Dynamic microphone input (MIC2)
Here you may connect a dynamic microphone
MH-31 or any other dynamic microphone with
the RJ-45 connector and similar pinout
2.
Electret microphone jack 3.5 (MIC1)
Here you may connect an electret microphone
from a PC's headset
3.
Power and connection LED indicator
(IND)
This indicator displays operation modes of the
transceiver, thorough description of the LED
operation in Paragraph 8.
4.
Reset button (RST)
Press this button to reset IP-address and UDP-
ports of the transceiver to the default IP values:
192.168.16.225, ports: 50001, 50002.
5.
Headphones jack 3.5
Here you may connect headphones with 16-30
Ohm impedance or speakers, power output not
higher than 150 mW.
6.
LAN connector
LAN connector for connection of the
transceiver to a local network via the LAN
cable.
7.
Power connector
Connector is intended for connection of DC
power source with voltage of +12V and
maximum load current 3A.
Transceiver has a shutdown circuit, protecting
device from the power polarity reversal.
8.
Power on/off button
Press the button to power on/off the device

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Rear panel of the transceiver
9.
ANT connector for HF antenna
Use this connector when you want operate on
HF or 6m band.
10.
EXT CTRL connector
Use this connector to control external devices.
Warning! Improper use of this connector can
damage transceiver’s keys!
11.
KEY jack 3.5
CW key connector.
12.
(BT)
Not used, DO NOT PRESS!
13.
PTT jack 3.5
PTT footswitch connector.
14.
External reference oscillator Input
10 MHz
10 MHz CMOS level input
Appropriate Voltage for this input: 10-13
dB/mW amplitude and 10MHz frequency.
Warning! Improper use or higher voltage may
damage the transceiver!

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4. Connectors pin-out
4.1 EXT CTRL
Via the EXT CTRL connector, you can control external devices, such as power amplifiers,
antenna switches and tuners, wide or narrow band-pass filters.
Pins description of the EXT CTRL connector
No.
Pin Name
Description
1.
X1 –X7
Switches with open collector (programmable I/O with software)
2.
X8
Switch with open collector to control an external PA, max current 100
mA, max voltage 33 V
3.
CP
Protective diode pin
4.
+12V
Pin for power supply +12V, MAX current 0.8 A, 2A fused
5.
G
Ground
6.
I1, I2
Button sensors, works on the input
7.
RA, RB
RS485 Interface

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4.2 MIC1
MIC1 connector is designed for connection of an electret microphone, PC headset or any
other electret microphone, which is intended to work with PC.
JACK 3.5 mm connector pinout
4.3 MIC2
Dynamic microphones are less sensitive to the foreign noises due to the greater focus.
Dynamic microphones have a higher speech quality and signal/noise ratio during operation.
Pin description and numbering of MIC2 input
MD-15 dynamic microphone pin-out

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4.4 PTT footswitch
The PTT footswitch allows you to turn the SunSDR2 QRP transceiver into TX mode.
Cable pinout for PTT footswitch connection
4.5 CW-key
Different CW-keys have different connectors. You may also use JACK 3.5 mm for connection
to PC.
CW-key connector pinout
5. Local operation
Local operation is a standard way to use the SunSDR2 QRP transceiver. Make the following
connections as described below:
1. Connect headphones and microphone to the transceiver.
2. Connect an HF-antenna to the ANT connector;
3. Connect the transceiver and a PC with a CAT5 Ethernet cable;
4. Start the ExpertSDR2 software with the red Start button.
5. Open the Options→ Device menu and set the checkboxes according to the picture below:

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6. In the ExpertSDR2 main window select the microphone you are going to use:
7. Open Options→Sound Card menu and make sure that the Enable checkbox in the
Sound card half is unchecked. See picture below:
8. Click OK. If everything is done correctly, you will see the air noise on the panorama and
hear the sound in the headphones.

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6. Remote operation
Over the following link you may find the manual which thoroughly describes how to operate
any Expert Electronics device remotely.
7. Default Settings
Sometimes you may need to reset IP address and ports of the transceiver, to do that follow
the steps below:
1. Switch off the transceiver with the PWR button;
2. Press and hold the RST button on the rear panel of the transceiver, you will hear a light
click;
3. Switch on the transceiver with the PWR button. The LED will blink different colors (green
and red);
4. Release the RST button;
5. Wait until the LED turns to constant green light, it means the reset went successfully.
After the reset procedure the transceiver will have the default IP-address 192.168.16.225
and ports 50001, 50002.
Warning!
Do not switch off the transceiver with the PWR button while LED is blinking.
8. Operation of the LED on the front panel
LED blinks - it means the transceiver is initializing and not ready for operation. If it constantly
blinks, it means there is no network connection.
LED is stable (NOT blinking) - transceiver is ready for operation and can be connected to
the ExpertSDR2.
In the SunSDR2 QRP we used an advanced stack of a local network, so you have 4 options
for local operation:
1. DHCP Auto mode is set by default. It works this way: in the beginning, transceiver works
in DHCP Client mode and tries to get the IP-address automatically from an external server,
if it gets the IP address, LED will stop blinking, becoming stable green color. If transceiver
can't get the IP address within ~20 seconds, it will automatically turn to DHCP Server mode
and provide IP address, in this mode LED will become stable orange.
2. DHCP Server mode is for direct connection of the transceiver and a PC. In this case, the

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transceiver will provide a PC with the correct IP address, so you don't have to adjust network
card settings. In this mode, LED will become stable orange. in this mode, the transceiver will
also have a static IP address 192.168.16.225.
3. DHCP Client is for connection of the transceiver to the home local network, where you
have a DHCP-server, which automatically provides IP addresses, for example, router or
ADSL-modem. In this mode, LED will become stable green.
4. Static IP, in this mode transceiver, has a static IP address, works the same as in
SunSDR2PRO - in this mode LED will become stable orange. By default, IP address is
192.168.16.225. This mode requires to set up PCs network card according to the same
instruction as for SunSDR2PRO. We do not recommend to use this mode without special
need.
Note: if you have a direct connection, after initialization process you may change a network
mode to DHCP Server, this will save you about 20 seconds after switching on.
9. Regulatory requirements
We Expert Electronics LLC declare that SunSDR2 QRP transceiver has been tested in
accordance to essential protection requirements of the R&TTE Directive 1999/5/EC on the
approximation of the laws of the Member States relating to Radio Spectrum Matters and
found the test results meet the limitation of the relevant test standard(s) listed below:
EMC
EN 301 489-1: V 1.9.2 (2011)
EN 301 489-15: V 1.2.1 (2002)
Radio Spectrum
EN 301 783-1: V 1.2.1 (2010)
EN 301 783-2: V 1.2.1 (2010)
Type of Equipment: Base Station
The system is to be operated in accordance with the laws of the telecommunications
regulatory agency in the country of use. A license is required to use this equipment, and the
operator must comply with the national frequency allocations for the county of use.
Expert Electronics LLC confirms that we place on the market products sourced from
suppliers who have confirmed that their products are RoHS compliant. Expert Electronics
LLC declares that this equipment complies with the restriction of the use of certain hazardous
substances in electrical and electronic equipment.

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Waste Disposal:
The device may not be disposed of with household waste! This device complies with EU
Directive on Electronic and electrical equipment (WEEE regulation) and will therefore not be
disposed of with household waste. Dispose of the device to your local collection points for
electronic equipment!
©Copyright 2018, Expert Electronics LLC. All Rights Reserved.
DUC DDC SDR Series, SunSDR2 QRP Transceiver. Specifications are subject to change
without notice or obligation and specifications are only guaranteed within the amateur radio
bands.
V1.0 - 01/29/2018