Expert Electronics SunSDR2 DX User manual

Expert Electronics
© 2020 Expert Electronics
SunSDR2 DX
USER MANUAL
1.3.2
HF/50 MHz/VHF TRANSCEIVER
Direct Sampling SDR transceiver

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SunSDR2 DX User Manual © 2020 Expert Electronics
TABLE OF CONTENTS
1. READ IT FIRST 6
1.1 Congratulations .......................................................................................... 6
1.2 Features ...................................................................................................... 6
1.3 Supplied accessories ................................................................................... 7
1.4 Precautions ................................................................................................. 8
1.5 ExpertSDR2 Software License Agreement ................................................ 9
1.6 Copyrights ................................................................................................. 10
1.7 Contacts .................................................................................................... 10
2. FRONT PANEL DESCRIPTION 11
3. REAR PANEL DESCRIPTION 13
3.1 Antenna .................................................................................................... 15
3.2 Grounding ................................................................................................. 15
3.3 Accessories ............................................................................................... 16
3.4 External Linear Amplifier ......................................................................... 17
3.5 External Control devices .......................................................................... 17
3.6 Reference input ........................................................................................ 18
3.7 Transverter connection ............................................................................ 18
3.8 DAC OUT low power output ..................................................................... 19
3.9 ADC IN and RX OUT .................................................................................. 19
4. CONNECTORS PIN-OUT 21
4.1 MIC1 .......................................................................................................... 21
4.2 MIC2 .......................................................................................................... 21
4.3 EXT CTRL .................................................................................................. 22
5. ExpertSDR2 SOFTWARE DESCRIPTION 24
5.1 Global controls panel ................................................................................ 25
5.2 Transceiver control panel ......................................................................... 29
5.3 Frequency and S-meter indicators ........................................................... 44
5.4 DSP control panel ..................................................................................... 47
5.5 Panorama description .............................................................................. 50
5.5.1 Spectrum Scope ...................................................................................... 50
5.5.1.1 Spectrum Scope scaling .......................................................................... 51
5.5.2 Waterfall ................................................................................................ 52
5.6 Status bar ................................................................................................. 53
5.7 Options ...................................................................................................... 54
5.7.1 Device .................................................................................................... 54
5.7.1.1 VOX .................................................................................................. 55
5.7.1.2 DSP ................................................................................................... 55
5.7.1.3 TX .................................................................................................... 59

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5.7.1.4 CW .................................................................................................... 61
5.7.1.5 Ext Ctrl ............................................................................................... 62
5.7.1.6 Expert ................................................................................................ 64
5.7.2 Sound card ............................................................................................. 66
5.7.2.1 Sound card .......................................................................................... 66
5.7.2.2 Line out .............................................................................................. 67
5.7.3 VAC menu .............................................................................................. 69
5.7.4 Display ................................................................................................... 70
5.7.4.1 Main .................................................................................................. 70
5.7.4.2 Spectrum ............................................................................................ 72
5.7.4.3 Waterfall ............................................................................................. 75
5.7.4.4 Grid ................................................................................................... 76
5.7.4.5 Filter .................................................................................................. 76
5.7.4.6 Background ......................................................................................... 77
5.7.4.7 Indicators ........................................................................................... 78
5.7.5 CAT ....................................................................................................... 79
5.7.5.1 ECATv1 .............................................................................................. 79
5.7.5.2 OmniRig .............................................................................................. 81
5.7.6 Panel ..................................................................................................... 82
5.7.7 Features ................................................................................................. 87
5.7.8 ExpertSync ............................................................................................. 87
5.7.9 CW Skimmer .......................................................................................... 88
5.7.10 Shortcuts ................................................................................................ 90
5.7.11 IQ Recorder ............................................................................................ 91
5.7.12 TCI ........................................................................................................ 91
5.7.13 Spot settings ........................................................................................... 92
6. TECHNICAL CHARACTERISTICS 94
6.1 Receiver .................................................................................................... 94
6.2 Transmitter ............................................................................................... 95
6.3 Other ......................................................................................................... 96
7. TRANSCEIVER OPERATIONS 97
7.1 Local operation ......................................................................................... 97
7.2 Remote operation .................................................................................... 97
7.3 Frequency Tuning ..................................................................................... 97
7.4 Antenna switch ......................................................................................... 98
7.5 Voice Recorder Operation ........................................................................ 99
7.6 SPLIT operation ...................................................................................... 100
7.6.1 SPLIT + Sub RX Operation ..................................................................... 101
7.7 RIT/XIT .................................................................................................. 101
7.7.1 RIT ...................................................................................................... 101
7.7.2 XIT ...................................................................................................... 102
7.8 Digital modes operation ......................................................................... 103
7.9 Firmware-based protections .................................................................. 103
7.10 Settings folder ........................................................................................ 104

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7.11 2 TRXs on 1 PC ....................................................................................... 104
8. RESET SETTINGS AND FIRMWARE 105
9. REGULATORY REQUIREMENTS 107

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SunSDR2 DX User Manual © 2020 Expert Electronics
READ IT FIRST
1READ IT FIRST
1.1 Congratulations
On behalf of the whole Expert Electronics company, we'd like to thank you for purchasing one of
the best modern SDR transceivers!
The SunSDR2 DX transceiver is the smallest 100W SDR transceiver, which is perfect for
contests and DXpeditions!
1.2 Features
The SunSDR2 DX transceiver based on the well-known SunSDR2 PRO transceiver with several
hardware improvements. It is a 100W-HF; 50W-6M; 8W-2M transceiver, very compact, has
active cooling and improved supply system, meaning it’s perfectly suited for DXpeditions. Also,
we've added a separate connector for an external ATU, thus SunSDR2 DX has all the
functionality you got used to in our radios and even more. Improved hardware along with the
ExpertSDR2 software makes this high-performance SDR transceiver the perfect base station.
The evident choice for a true contester!
Hardware improvements in comparison to SunSDR2 PRO:
· Improved supply system, which leads to less heating and less power consumption
· HPF for VHF (100 MHz) to eliminate strong out-of-band stations coming from HF
· LPF for HF (70 MHz) to eliminate strong out-of-band stations coming from VHF
· New VHF LNA chip - PGA103+
· New high-performance built-in stereo audio codec 24 bit with 114 dB dynamic range
· Sturdy DIP-type ExtCtrl connector
· New connectors: external tuner control, GND
· Improved PCB topology
Main features and capabilities of the transceiver
· Independent RX path based on DDC (Direct Down-Conversion) architecture
· Independent TX path based on DUC (Direct Up-Conversion) architecture
· Output power: 100W on HF, 50W on 6M and 8W on 2M
· 2 software RXs + SubRX for each of them (4 slices total) + independent wideband
Bandscope up to 80 MHz
· Remote control operation, using it, you connect PTT and CW-key to the E-Coder panel.
Microphone and E-Coder are connected to the remotely set up PC

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· TCI interface for seamless connection with third-party software, the list of software with TCI
support is published on our website
· Professional TX processing module provides the most advanced tuning capability for
voice operation
· ExtCTRL connector to control external devices with 8 powerful keys with open collector
· ALC connector for external power amplifiers*
· Supports use of VHF transverters*
· An opportunity to use the transceiver as a signal generator via DAC OUT connector (SMA
connector)
· An opportunity to use external filters in the middle of the RF path, using ADC IN and RX
OUT (SMA connector)
· A small delay in CW mode (about 10 ms)
· Input for external 10 MHz reference oscillator
· An opportunity to use the transceiver in SO2V mode
· Full duplex or half duplex modes*
· Antenna switch with 2 HF antenna connectors and separate VHF antenna connector (Mini
UHF connectors)
· Internal power-meter for HF and VHF bands and SWR-meter for HF band
· Ethernet LAN interface provides a fast and reliable connection to PC
* These functions are supported by the transceiver's hardware, but is not implemented in the
ExpertSDR2 software. They will be supported in the future ExpertSDR software releases.
Minimal PC requirements
· CPU Intel Core i3 / Core i5 or better
· 8GB RAM
· Video card, minimum resolution 1024x600, 128 MB, OpenGL 1.5 support and higher
· The ExpertSDR2 works with Windows 7-10 32/64 bit, Linux (Ubuntu/Kubuntu 20.04 LTS x64)
and macOS 10.15 and newer
Block Diagram will be available later.
1.3 Supplied accessories
· SunSDR2 DX transceiver
· External fan fastened to the heatsink, size 140 x 140 mm
· LAN-cable for connection to a local network (1.8m)

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· Power cable for connection to a power supply (2m)
· Audio-adapters JACK 6.3mm to JACK 3.5mm (2 pcs.)
· Adapter Mini UHF — HF PL259 1Ft (0.3m 1 pc.)
Additional equipment:
Additionally you can purchase the following devices:
· E-Coder Plus, E-Coder panel or E-Coder mini kit for convenient remote operation
· PTT footswitch
1.4 Precautions
To prevent any damage to the transceiver, please read these operating rules
carefully before attempting to operate on the air.
Carefully read this manual first, otherwise connecting and operating the SunSDR2
DX could lead to fatal errors.
· Visually inspect the SunSDR2 DX transceiver for the absence of mechanic damages before
connecting it to PC
· Before connecting the SunSDR2 DX to the DC power line, ensure it is grounded. Never use
the SunSDR2 DX transceiver without grounding
· It is forbidden to connect the SunSDR2 DX to PC with the voltage presence on it or in the
switched condition
· It is forbidden to use the power supply with the voltage higher than +16 V. Remember! The
transceiver is powered by DC voltage!
· If the SunSDR2 DX was stored in abnormal climatic conditions, it is recommended to keep it
in normal operating temperatures for at least 2 hours before switching on
· It is forbidden to use and store the Transceiver in the dusted rooms and expose it to direct
sunlight for a long time
· Before connecting the external devices to EXT CTRL connector read the Manual, learn tables
and diagrams of connecting the external devices
· DO NOT connect a VGA monitor to EXT CTRL port, you will damage the transceiver!
· Remember! The transistor switches have limitations of supply voltage and current, going
through them. DO NOT allow polarity reversal!
· DO NOT use the SunSDR2 DX in temperatures lower than 0ºC (32ºF) and higher than +75ºC
(167ºF)

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· DO NOT transmit without a load (dummy load/matched antenna) - it will lead to
overheating of the engaged components and may result in their failure. The same applies to
an unmatched load
· Avoid the exposure of the atmospheric downfalls on the SunSDR2 DX and never spill any
liquids (especially aggressive) on it
· It is forbidden to use the Transceiver during storms!
· Always disconnect the antenna from the Transceiver when not in use, or if there is a
danger of atmospheric electricity
· 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
· Ensure the Transceiver and any connecting cables are free from the effects of
electromagnetic interference and uncontrolled currents and voltages
· To avoid damage to the Transceiver or causing harmful interference on air, it should only be
operated by licensed HAMs
· Keep the Transceiver out of the reach of children
· If the transceiver emits an abnormal odor, or smoke, immediately turn it OFF and remove the
power cable. Contact your closest Expert Electronics dealer for advice
· Always take great care when moving or transporting the transceiver
· Ground the antenna-mast and antenna-feeders to avoid accumulation of atmospheric static
electricity on them
· Always use ferrite beads on antenna and other cables, connected to the transceiver
1.5 ExpertSDR2 Software License Agreement
The ExpertSDR2 software is the proprietary product and intellectual property of Expert Group. It
is forbidden to modify, copy or disclose to third parties ExpertSDR2 software distribution.
Official versions of the software are published on the manufacturer's website in the section
"SunSDR2 DX Transceiver/Downloads".
New versions of the ExpertSDR2 software for the SunSDR2 DX transceiver may have different
titles from time to time. This license agreement applies to all new versions of the software and
may be supplemented and/or amended unilaterally by Expert Group.
The manufacturer reserves the right to alter and/or improve the SunSDR2 DX transceiver
software, adding new features and bug fixes. In this regard, the software may be different from
the description herein. Ask your closest dealer on the availability of new, more complete version
of the User Manual, or look for them on the official website of the manufacturer in the section "
SunSDR2 DX Transceiver / Documentation".

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SunSDR2 DX User Manual © 2020 Expert Electronics
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Users of the SunSDR2 DX transceiver can update the software by themselves, by downloading
from the official website of the Expert Group company.
The manufacturer is not responsible for the consequences of the user utilizing an unofficial or
modified version of the ExpertSDR2 software and/or changes the settings or other files which
are related to the ExpertSDR2 functionality.
The manufacturer assumes no responsibility for the material, moral or any other kind of damage,
whether expressed or implied, caused by using of a third-party software.
The manufacturer assumes no responsibility for the material, moral or any other kind of damage,
whether expressed or implied, caused by using of external devices along with the SunSDR2 DX
transceiver.
1.6 Copyrights
Expert Group company holds copyrights for the SunSDR2 DX transceiver, intellectual property:
ExpertSDR2 software and all User Manuals and Instructions for the device and software.
It is forbidden to present this document as your own, sell it or use it in any other commercial
activity.
Expert Group company does not guarantee, that the functions and their qualities described in
this manual, and also combinations which were not described in the manual, comply with the
User purposes, if it is not mentioned in the Manual. Expert Group company does bear any
responsibility for the material, moral or other kinds of damage expressed or implied by such
actions.
1.7 Contacts
MANUFACTURER
Expert Group
Web-site: www.eesdr.com
E-mail: [e-mail]
You can contact us via mentioned above mail address about: your orders, inquiries, technical
support, software support.

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SunSDR2 DX User Manual © 2020 Expert Electronics
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2FRONT PANEL DESCRIPTION
#
Name
Description
1
Power on/off button
Press the button to power on/off the transceiver.
2
Power and connection
LED indicator
This indicator displays operation modes of the transceiver:
- green color: LAN is active/connected;
- red color: transmit mode is “ON”;
- blinking green or orange color: network setup state, wait until
blinking stops.
3
Dynamic microphone
(MIC2)
Here you may connect a dynamic microphone MH-31 or any other
dynamic microphone with the RJ-45 connector and similar pinout.
Allowed output impedance is 500-600 Ohm.
4
Electret microphone
jack 6.3 (MIC1)
Here you may connect an electret microphone from a PC's
headset.
5
Headphones jack 6.3
(PHONES)
Here you may connect headphones with 16-30 Ohm impedance or
speakers.
Warning! Never use headphones with a mono connector! If you
have a monophonic headphones, use the stereo 6.3 mm Jack and
connect headphones to one of the channels.

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FRONT PANEL DESCRIPTION
Warning! Never connect two stereo channels with each other!
Note: Headphones with high impedance may sound quieter.

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FRONT PANEL DESCRIPTION
3REAR PANEL DESCRIPTION
#
Name
Description
6,
7
A2 and A3 connectors
for HF antennas
Use these connectors when you want operate on HF or 6m band.
8
ATU
Connector for the external Antenna Tuner Unit, designed by
Expert Electronics.
9
RX OUT
Internal receiver's front-end output.
Warning! Improper use or higher voltage may damage the
transceiver!
10
ADC IN
Direct input, bypassing Band Pass Filters (BPFs). ADC IN
connector may be used for connection of the receiving antennas.
Between ADC IN and RX OUT you can put a transverter,
additional BPFs, preamplifier, attenuator etc.

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REAR PANEL DESCRIPTION
Warning! Improper use or higher voltage may damage the
transceiver!
11
DAC OUT
Direct output, bypassing Band Pass Filters (BPFs) and operating
in a wide frequency range. The output can be used for connection
of the external power amplifiers, transverters and as a generator of
the measuring signal. Transmission is possible only on the amateur
bands.
Warning! Improper use or higher voltage may damage the
transceiver!
12
Anderson Powerpole
connector
Connector is intended for connection of DC power source with
voltage of up to +15V and maximum load current 5A.
Recommended DC voltage 13.8V.
Transceiver has a shutdown circuit, protecting device from the
power polarity reversal.
13
External reference
oscillator Input 10 MHz
10 MHz CMOS level
input
Appropriate Voltage amplitude for this input: 1...3 V Pk-to-Pk and
10 MHz frequency. Input impedance 2 kOhm.
Warning! Improper use or higher voltage may damage the
transceiver!
14
GND
Ground connector
15
A1 connector for VHF
antenna
VHF antenna connector. Use it when you want to operate on 2m
band.
16
ALC input
ALC input for external power amplifier
17
EXT CTRL connector
Use this connector to control external devices.
Warning! Improper use of this connector may damage keys!
18
PTT footswitch
connector, jack 6.3
PTT footswitch connector
19
RST (reset) button
Press this button to reset IP-address and UDP-ports of the
transceiver to the default IP values: 192.168.16.200, ports: 50001,
50002.
20
KEY connector, jack
6.3
CW key connector.
21
BT
DO NOT PRESS WITHOUT NEED!

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REAR PANEL DESCRIPTION
Use it to set the transceiver in the boot mode.
22
LAN connector
LAN connector for connection of the transceiver to the local
network via the LAN cable.
GPS
Not used in series devices
3.1 Antenna
Before connecting the antenna, check the integrity of the antenna-feeder path.
For best results, the antenna should have an impedance of 50 Ohm to match the 50 Ohm
impedance of the HF nodes of the transceiver.
The antenna should have SWR level not worse than 1.5:1. If the SWR is worse than 1.5:1,
match the cable and the antenna to the desired level.
Note:
· Using a mismatched antenna-feeder path might cause non-linear distortion of the transmitted
signal, HF interference on the transceiver's cables and/or interference of TV's or other
devices.
· Transmitting with a receiving antenna may damage it.
Warning!
i Always use E-type ferrite beads on antenna and other cables, connected to the
transceiver!
3.2 Grounding
To eliminate the risk of electric shock it is essential to use a reliable grounding connection for
the transceiver, the best grounding point is the antenna connector.
Warning!
i Never use water or gas pipes for grounding!
i Never use the SunSDR2 DX transceiver without a reliable grounding!

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REAR PANEL DESCRIPTION
3.3 Accessories
You can connect several accessories to the transceiver's rear panel, as shown on the picture
above.
PTT Footswitch should be connected to the PTT socket, it controls the transceiver's TX
mode. Connector type - 6.3 mm Jack.
When you press the footswitch, PTT Line connects to the Ground (Case), it turns the
transceiver to TX. A red LED TX indicator on the front panel and in the software window,
indicates that the TX mode is on.
Releasing the footswitch returns the transceiver to the RX mode.
Straight Key should be connected to the KEY socket using the stereo 6.3 mm Jack, with
disconnected ring contact. Pressing the key turns the transceiver to the TX mode and it
generates a continuous CW signal (manual mode).
Releasing the straight key returns the transceiver to the RX mode.
Twin-paddle key (single-paddle) should be connected to the KEY socket using the mono
6.3 mm Jack. Pressing one of the key's paddles (or one side - for single-paddle) will turn the
transceiver to the TX mode and begin automatic generation of dots and dashes.
Releasing the paddle returns the transceiver to the RX mode.
CW key connection via COM-port.
CW paddle can also be connected to the COM-port of your PC, according to the picture below.

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REAR PANEL DESCRIPTION
In the ExpertSDR2 DOT/RTS = DOT/CTS and DASH/DTR = DASH/DSR.
In the ExpertSDR2 you set COM-port pins of your PC, which uses DTR and RTS for keying.
DTR and RTS from PC should be connected to local DSR and CTS pins, which are showed on
the picture with the paddle. DSR and CTS are RX lines (inputs) that is why they used like this.
3.4 External Linear Amplifier
You can connect external Power Amplifiers (PAs) to the transceiver.
It may be required to make several connections depending on the required external PA type.
Connect a 50 Ohm HF cable to the transceiver's antenna connectors A2, A3 or A1 if it's a
VHF PA, connect the other end of the cable to the input of the PA.
To control the TX mode of the external PA you can use the X8 pin terminal of the EXT CTRL
connector (more details in EXT CTRL devices ).
If an external PA supports operation with the transceiver's ALC system, you can connect it via
cable with RCA-type phono plugs. The ALC voltage range -3...0 V (see the warning below).
Note:
· While connecting the cables, transceiver and PA should be switched off.
Warning!
i There is a small delay in the ALC-system functionality, which may lead to a short-
term overload of the external PA. This phenomenon could cause off-frequency
emissions or failure of your PA! The User of the transceiver should understand and
accept the above, taking responsibility for the potential consequences of using the
ALC-system. The manufacturer is not responsible for direct or indirect damages of
any kind from using the ALC-system.
3.5 External Control devices
The SunSDR2 DX transceiver allows you to control external devices via seven electronic keys in
the EXT CTRL connector.
With the keys you can have direct control of antennas, external band pass filters, external PA's
bands, HF preamplifiers, external transverter PTT etc. Commutation depends on the band and
RX/TX mode.
You can adjust Ext CTRL operation in the software Settings (more details in EXT CTRL ).
Note:
· The Electronic keys have a built-in protection diodes for inductive loads (relays, fans,
solenoids, etc.) with a maximum reverse voltage of 75 V and current up to 200 mA (1N4148
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REAR PANEL DESCRIPTION
diodes). If your inductive load gives a higher reverse current, it is necessary to use an external
diode in parallel to the connected load.
· The X8 key is designed for control of the external PA.
Warning!
i Never use a VGA cable from your monitor, to connect external devices
i Never connect monitors with the VGA interface to the ExtCTRL connector
i Incorrect connection of external devices and / or uncontrolled galvanic
connections could lead to the malfunctions of the transceiver or its failure!
3.6 Reference input
A 10 MHz external reference oscillator can be connected to the REF IN connector with a
coaxial cable.
Set the Use external reference checkbox in the ExpertSDR2 menu to use an external
reference oscillator (more details in Device menu).
Signal parameters of the Reference Frequency:
· Reference signal frequency of 10 MHz
· Reference signal voltage: min. 2.5 V; max. 3.3 V
· Input impedance of 500 Ohm
· SMA type connector (female)
Note:
· Use an external reference oscillator via REF IN connector to increase the stability of the
transceiver's tuning frequency, if +/- 0.5 ppm stability is not enough. Also transceiver's
frequency synchronization with an external reference oscillator is used when you want to sync
several devices with each other, from one reference oscillator.
· The Phase frequency of the transmitted and received signals depends on the phase
frequency of the external reference oscillator.
3.7 Transverter connection
Connect VHF, SHF transverters to the A1 connector of the transceiver.
VHF, SHF transverter may also be connected to the transceiver via the ADC IN and DAC
OUT connectors.
ADC IN used as the input in the RX mode. DAC OUT used as the output in the TX mode.
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REAR PANEL DESCRIPTION
The DAC OUT does not have a constant voltage to control the TX mode, so it is necessary to
use an additional control line while you use the DAC OUT in the TX mode. For this you may use
any EXT CTRL key (more details in EXT CTRL devices ).
3.8 DAC OUT low power output
The DAC OUT is the transceiver's low-power output, which functions in the wide frequency
band. It could be used for connection of external power amplifiers, transverters and as a source
of measuring signal.
To use the DAC OUT enable it in the antenna switch .
DAC OUT output parameters:
Max output power: 10 mW
Frequency band: 0.1...150 MHz
Transmitted signal band: 20 kHz
Impedance: 50 Ohm
Signal level: +10 dBm (max)
3.9 ADC IN and RX OUT
The ADC IN connector is the direct receiver input, bypassing Band Pass Filters (BPFs). Use
the ADC IN for connection of RX antennas, transverters, additional BPFs, preamplifiers,
attenuators etc.
Note:
· The signal from ADC IN connector goes directly to the ADC input and may be amplified by
the +10dB preamplifier, if you set it in the software.
· ATT is disabled when you use ADC IN alone, without RX OUT.
· When you select ADC IN in ExpertSDR2, A3 antenna input is still working and can pick up
some strong stations, A1 and A2 inputs are completely disabled.
Warning!
i Maximum allowed signal level on the RX IN connector is 0.3V of the active
voltage (RMS). Do not exceed this level, it may result in the transceivers overload
and ADC fatal damage.
The RX OUT connector is the output of the transceivers receive path. When the ADC IN is
enabled, the signal received on the HF path from the active antenna input, goes to the RX OUT.
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REAR PANEL DESCRIPTION
Between the RX OUT and RX IN connectors may be added an additional filter or box of
switched filters, preamplifier, attenuator, signal divider etc.
Note:
· The signal passing through the HF path, with output via RX OUT, may be attenuated by the -
20dB attenuator, if you set it in the software.