Radioddity QR20 User manual

Full Mode
SDR Transceiver
V1.0 May. 2021
User Manual

About Radioddity
“You, our friend and customer, are at the forefront of what we do.”
Thank you for purchasing Radioddity products. On behalf of our caring and responsive Customer
Support team, we strive to fulfill that promise and better meet your needs every day.
In order to protect your rights and interests, please read the terms of Warranty Policy.
Copyright
Radioddity reserves all rights to this manual, and reproduction of any part of this manual is prohibited
without permission.
Warning
Please read this manual fully before operation so as to get a good understanding of the QR20’s
capabilities and functions.
When using an external power supply, carefully check the polarity of the power cord and do not
reverse the polarity.
The limited warranty of this radio does not include damage caused by an external power
connection error or damage caused by improper power supply voltage.
Qualified technicians shall service this equipment only.
Do not tamper the transceiver for any reason.
Do not use any transceivers with a damaged antenna. If a damaged antenna comes into contact
with your skin, a minor burn can result.
Turn off your transceiver prior when entering any area with explosive and flammable materials.
Do not charge your transceiver in the area with explosive and flammable materials.
To avoid electromagnetic interference and/or compatibility conflicts, please turn off your
transceiver in any area where posted notices instruct you to do so.
Turn off your transceiver before boarding an aircraft; any use of a radio must be in accordance
with airline regulations or crew instructions.
Turn off your transceiver before entering a blasting area.
Do not place a transceiver over an airbag area or in the airbag deployment area for vehicles with
an airbag.
Do not expose the transceiver under direct sunlight over a long time, nor place it close to a
heating source.
When transmitting with a transceiver, hold it with the microphone 3 to 4 centimeters away from
your lips; also make sure the antenna stays at least 2.5 centimeters away from your body when
transmitting.
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Summary
The Radioddity QR20 is an ultra-portable full-frequency full-mode SDR radio with a reception from
100kHz to 2GHz and transmit from 160m to 70cm. The operation modes include SSB, CW, AM, FM,
RTTY and digital modes. It includes multiple advanced functions and features as an SRD radio
station. The QR20 is designed with both USB and DC interface power supply modes.
The display adopts high-brightness and high-resolution liquid crystal display with adjusted backlight
brightness, which can be clearly displayed outdoors. The panel is designed with full keyboard, which
is convenient for various operations. The keyboard is with backlight to help operate this radio in a
dark environment. The QR20 has a built-in Bluetooth module, a USB cable integrated sound card
and a serial port. You can easily control the radio with a single USB cable.
The QR20 has a lot of advanced features that are only available in large base stations. This gear has
dual VFO mode, different frequency operation function, intermediate frequency offset adjustment,
receiving frequency fine-tuning, intermediate frequency noise suppression, AGC speed selection, RF
gain adjustment, squelch control, front attenuator, AM aviation communication reception, AM/FM
Broadcast reception, built-in telegraph automatic key, automatic key-point ratio adjustment, built-in
CTCSS analog tone, automatic shutdown function (APO), transmission timeout function (TOT);
connection with computer and computer-aided control function, copy function, etc.
In addition, the QR20 has several modules to customize more functions.
Features:
1. Real-time spectrum
2. Waterfall chart
3. Supports FT8 mode
4. Using software-defined radio technology
(SDR), with multi-band and multi-mode
(SSB, CW, RTTY, AM, FM, and optional
DMR) support
5. Double conversion circuit structure
6. IF width and IF shift hardware and
software can be modified to provide
powerful IF interference suppression
7. DSP digital noise reduction
8. Built-in 160-6 meters high-speed
automatic antenna tuner
9. Built-in electronic key controller, all
parameters can be set flexibly
10. Built-in sound card with IQ and audio output
11. USB TYPEC3.1 interface for power supply
and computer connection
12. High precision TXCO ± 0.5ppm (-10-60 ℃)
13. Ultra-wide working voltage range: 5-32VDC
14. Power supply reverse polarity protection
15. GPS / BeiDou, GSM, electronic compass
(acceleration, angle sensor) (optional)
16. GPS time service (requires optional
GPS module)
17. Built-in UTC clock
18. Voltage display
19. VOX
20. Support RTTY, DTU, CW via keyboard
21. Ultra-light weight: ≤4.4lb (2kg)
22. IF IQ signal output available (which enables
DRM decoding via PC)
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Table of Contents
Accessories and Options
Specifications
Panel and Interface
Front panel
Key function
Indicator Light
Main Interface
Rear panel interface
Interface definition
Radio Setting and Operation
Turn on/off QR20
Frequency band selection
Frequency selection
Mode selection
Transmit power selection
Receive volume, MIC gain
Hand microphone selection
Channel saving
Band selection operation
Different frequency operation
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AF audio setting
RF setting
USB sound card data output format setting
Transceiver frequency offset setting
Transceiver mode setting
Tune operation
A/B frequency operation
NR/NB noise suppression setting
Spectrum and waterfall display setting
Spectrum parameter display setting
Digital filter operation
Application Menu Operation
CAT Control
Receiving Operation
Transmitting Operation (Locked by Default)
SSB communication
CW communication
FM communication
Repeater operation
AM communication
Data communication RTTY
QR20 Firmware Upgrade
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Accessories and options
Built-in Module
WFM
Bluetooth module
Cable Hand Mic
Built-in sound card
Automatic antenna tuner
Optional Module
GPS + GSM
Electronic compass (Altitude meter)
DMR
External VFO Knob
Specifications
Transmitter Parameters
Receiver Parameters
SDR
DMR (optional), SSB, CW, RTTY, AM, FM
1Hz
1.800—2.000, 3.500—3.900, 5.351.5—5.366.5, 7.000— 7.200,
10.100—10.150, 14.000—14.350, 18.068— 18.168, 21—21.450,
24.890—24.990, 28—29.7, 50—54, 134— 170, 400—450MHZ
HF + 6m: SSB: (1-20W)
CW: (0.1-20W)
FM: (0.1-20W)
AM: (1-5W)
VHF: SSB / CW / FM (0.5-10W)
UHF: SSB / CW / FM (0.5-5W)
TX: 13.8V-6A (20W)
RX: 13.8V-0.25A typical value, 0.5A (highest brightness, audio peak)
<50db
1.8-54MHZ: ≥50db
144-146MHZ: ≥60db
430-440MHZ: ≥60db
99 channels
Transmitter Architecture
Transmission Mode
Frequency Resolution
Transmit Frequency
Range*1
Output Power
Power Current
Carrier Suppression
Spurious Suppression
Channels
Receiver Architecture
Reception Mode
Reception
Frequency Range
IF Bandwidth
Sensitivity *3
SDR
DMR (optional), SSB,CW, RTTY, AM, FM
100kHz—2GHz * 2
20kHz
SSB / CW: (BW: 2.4kHz @ 10dB S / N)
0.18uV (1.8-54MHZ)
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01

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02
Antenna Tuner Parameters
Spectral Parameters
Tuning frequency
Range
Tuning Impedance
Range
Tuning Accuracy
Tuning Time
Tuning Mode
1.8—54MHz
16.7Ω–150Ω Unbalanced (standing wave ratio is better than 1: 3)
VSWR: 1: 1.5 or less
2-5S (whole section 10 seconds)
Automatic
Conventional Parameters
Size
Weight
Voltage Range
Antenna Interface
170X120X45mm (excluding projections)
<2KG
RX:5-32V
TX: 5- 12V transmit power limit
12-18V full power output
18-32V transmit power limit
M
Sensitivity *3
Intermediate Frequency
Suppression
Image Suppression
Audio Output Power
0.25uV (144-146MHZ)
0.25uV (430-440MHZ)
AM: (BW: 6kHz @ 10dB S / N)
15uV (0.3-1.8MHZ)
2uV (1.8-54MHZ)
2uV (144-146MHZ)
2uV (430-440MHZ)
FM: (BW: 15kHz @ 12dB S / N)
0.5uV (28.0-29.7MHZ)
0.25uV (50-54MHZ)
0.3uV (144-500MHZ)
0.5uV (430-440MHZ)
≥70db
≥80db
2W (10% distortion rate, 4Ω Load, 3KHZ)
Spectral Bandwidth 48K radio frequency spectrum FFT
Note *1: Frequency range can vary according to different countries or regions, the actual frequency
by local legal provisions.
Note *2: Data retention.
Note *3: To be calibrated. The final interpretation reserved to manufacturers.

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03
Panel control and operation
Front panel
Key function
①Numeric keyboard
②LCD Monitor
③Function keyboard
④Headphone interface
⑤Wired hand microphone interface
⑥Receiving indicator
⑦Transmitting indicator
Key
Power
BAND
SPLIT
AF
RF
R/X
MODE
TUNE
A/B
NR
Short Key Function
Switch the standing wave table (VSWR),
ALC, MIC audio indication
Frequency band selection
Different frequency on, different
frequency off
Volume, MIC gain, MIC audio
compression, ground bass, treble
Radio frequency gain, Intermediate
frequency gain, AGC、SQL、ATT
RIT receiving frequency offset, IT
transmitting frequency offset
Mode setting
Antenna tuner on and off
A/B Band
NB or NR options
Long Key Function
Power on, power off
CW setting
Tone setting
Channel/VFO mode selection
USB data output format selection
Transceiver frequency offset switch
USB/LSB, NFM/WFM/CWR switching
Tuning start/stop
A=B Band
Spectrum only, waterfall only, display
both spectrum and waterfall

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04
Indicator light
Status
On
Off
Flashing
Red
Transmitting
Green
Receiving
Error
Key
DSP
PA
BW
Direction
Key Left
Direction
Key Right
Direction
Key Up
Direction
Key Down
MENU
Short Key Function
NR, NB, PEAK threshold setting
Transmitting power setting
Digital filter selection
Left selection or decrement operation
Right selection or increment value
Up operation
Down operation
Confirm
Long Key Function
Turn off NR or NB
High-low power switching
Spectrum bandwidth setting, spectrum
reference level setting, spectrum refresh
rate setting
*
*
Fast frequency adding
Fast frequency reduction
Application interface; Back

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05
Main interface
1. Digital filter
2. Waterfall illustration
3. Spectrum
4. Band A/B instructions
5. Mode display
6. SWR, AUD, ALC meter
7. S-meter (transmitting power meter
when transmitting)
8. Transmitting frequency
9. Receiving frequency
10. Voltage display
11. Tune enable display
12. Power display
13. Digital compass
14. LoRa display
15. GPS display
16. Bluetooth display
17. Time display
18. Digital filter bandwidth
19. Spectrum bandwidth
20/21. NR/NB display
22. RIT/XIT frequency offset
6
5
4
3
2
7 8 9 10
11
12
13
14
15
16
17
18
19
1
20
21
22

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06
Rear Panel Interface
1. Antenna interface
HF/50MHz/144MHz/430MHz antenna port
(M type), the output impedance is 50Ω.
2. DC power interface.
The specification of power interface is 5.5*2.5.
Use the standard DC power cord to connect to a
regulated power supply or battery. The power
supply must be able to provide a current of
6A@(13.8～16.8)V to ensure the full power
output of the radio. Need 15V-16.8V if using
higher power in HF band (note it generates more
heat), under 15V for UV band.
If the power supply less than 12V or more than
18V, the radio will be with limit power output.
3. SELEVE USB interface
It is used to connect the USB cable to the
computer and can output audio, digital and IQ
signals.
4. RS232 serial interface
5. Electric key interface
This interface is a 3.5mm three-core interface,
used to connect electronic automatic key control
or ordinary hand keys.
6. Network interface
Used for remote control and remote firmware
update.
7. GPS antenna port
Connected to an active GPS antenna.
8. PTT control output.
Used to control the amplifier’s PTT.
9. Audio output.
Demodulated audio output
It is used for connecting peripheral smart
devices, such as external wave wheels.
10. HOST USB interface
The function of this interface is temporarily
reserved. Please be careful if used for
charging external devices.
11. Grounding post
To achieve the best performance and ensure
safety, you can use a short and thick copper
stranded wire to connect this ground terminal
to the ground well.
11. Tune enable display
12. Power display
13. Digital compass
14. LoRa display
15. GPS display
16. Bluetooth display
17. Time display
18. Digital filter bandwidth
19. Spectrum bandwidth
20/21. NR/NB display
22. RIT/XIT frequency offset

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Interface Definition
Key
Power
Audio output/headphone interface Hand microphone

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08
1. To turn on the radio, simply long press the power button for one second.
2. To turn off the radio, simply long press the power button for one second.
Radio Setting and Operation
Please follow this guide to learn how to quickly set up and use your new equipment QR20.
To activate transmitting: Long press [MENU] - select [SET] - select [TX-EN] – select [ON] – long
press [MENU] again to exit.
Note: QR20 is with power-off data saving function. For example, when powered-off on 7.050Mhz
LSB, it will directly restore the data status (7.050Mhz LSB) before. This function is great for
remote operation.
Turn on/off QR20
1. The frequency range of QR20 is very wide. Short press [BAND] to pop up
the frequency band menu.
2. Short press the direction keys to select, short press [MENU] to confirm the
frequency band.
Frequency band selection
1. Short press the left and right direction keys to select the cursor position in image, short press the
up-direction key to adjust the frequency, long press the up and down direction keys to quickly
select the required frequency.
2. Input the required frequency by direct numeric keyboard.
For example: if you want to enter 14.270MHz, press the numeric keyboard: 014270000 or
14.270000, and then press the key [MENU] to confirm.
Frequency selection

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09
1. QR20 comes with a wired speaker, plug directly into the MIC port on the front panel.
When the wired speaker is connected to the radio, the MIC gain cannot be adjusted too much. In
SSB, if the wired speaker PTT is pushed and there is no speech and environmental noise but the
radio power meter has an output, then the hand microphone gain is too large and needs to be
reduced. It is so small that there is no power output when the hand microphone is quiet.
Usually, LSB mode is used below 7Mh, USB mode is used above 14MHz, and FM mode is used
above 28MHz. Please check your radio license before transmitting and abide by local laws and
regulations.
Hand microphone selection
Channel saving
The QR20 all bands support LSB、USB、CW、FM. Short press [MODE] button to select them. Note
that switch between LSB/USB, CW/CWR, and WFM/NFM need to long press [MODE] button.
Mode selection
1. Short press [PA] to enter the transmit power adjustment, use the up and down direction keys to
adjust the value.
2. Long press [PA] to quickly select the 5W/20W power, each selection can be fine-tuned by the up
and down direction keys.
Transmit power selection
1. Short press the [AF] button to enter the AF interface, use the left and right direction keys to select
the setting section, use the up and down keys to set the value.
SVOL: Volume
HVOL: Front-panel headphone volume
MIC: MIC gain
CMP: MIC compression ratio
BAS: Bass
TRB: Treble
Receive volume, MIC gain
2.
1. Long press [AF] to the channel mode
Long press the left and right direction keys to turn the numbers beside CH to red, short press
[MENU] to turn to green. When in green, use up and down direction keys to operate the channel
mode.
2.

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10
Band selection operation
Short press the [BAND] button to pop up the frequency band selection interface, press the direction
key to select the frequency band, and press the MENU key to confirm.
Different frequency operation
Short press [SPLI] to display the different
frequency, press again to turn off the
different frequency, press the left and right
direction keys to select the frequency, press
the up and down direction keys to increase
or decrease the frequency. The upper row of
frequencies is the receiving frequency and
the lower row is the transmitting frequency.
Press [A/B] to switch.
In channel mode. When in a non-stored channel (or want to replace an existed one), there is a
RENAME icon. Long press the right direction key to turn the RENAME to red, short press [MENU]
to pop up the input box.
3-1. Input method: currently only supports the input of letters and numbers.
3-2. Long press the number 1 key to switch the input of uppercase letters, lowercase letters,
numbers and punctuations, and short press the [MODE] button to delete.
3-3. When in punctuation, short press the [.] in left keypad to switch the selection among [, . ? ! : ;
' " ( ) < > [ ] { } $ % @ * + - = ~]. Short press the [MODE] button to delete.
3-4. When in letter, short press the number keys to select letters. Short press [2] to select A, twice
for B and triple for C.
2=ABC 3=DEF 4=GHI 5=JKL 6=MNO 7=PQRS 8=TUV 9=WXYZ
3-5. When in number, press [MENU] to confirm you input. Then adjust the frequency, mode, and
other corresponding parameters on the interface, and it will be automatically stored when the
radio is turned off.
3.
4. Enter the next channel and repeat the above operation.

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11
SVOL: Volume
HVOL: Panel headphone
volume
MIC: MIC gain
CMP: MIC compression ratio
BAS: Bass
TRB: Treble
USB sound card data output format setting
Long press the [RF] key to enter the USB sound card data output format selection interface, press
the up and down keys to select the output mode. Press and hold again to exit.
USB: Select USB when using digital modes like
FT8/HRD/N1MM/LOG32/RTTY
SDR: Select SDR when using software like SDR#/HDSDR
AF audio setting
Short press the [AF] button to enter the AF interface, use the left and right direction keys to select the
setting item, and use the up and down buttons to set the value.
RFG: RF gain
IFG: IF gain
AGC: Automatic gain adjustment speed
SQL: Squelch level (FM)
AMP: Pre-amplification
RF setting
Short press [RF] to enter the RF parameter setting interface, use left and right direction keys to select
the setting item, and use the up and down keys to set the value.

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12
Tune operation
1. Short press [Power] key to switch to SWR standing wave meter.
2. Long press the [TUNE] key to enter the automatic tuning mode. The machine will make a short
sound of click. The T on screen will turn green. Long press [TUNE] to exit if want to stop during
tuning. T turns green when succeed, turn gray when fail. Short press [TUNE] to turn off the tuner
when T is in green status.
3. Long press [.], QR20 will automatically enter 5W CW mode long tone transmission status. With
the standing wave, you can directly observe the SWR value of the antenna standing wave and
adjust your antenna feed system. Short press [.] again to exit.
Transceiver frequency offset setting
Long press [R/X] to open the interface for sending and receiving frequency offset setting, long press
again to exit. Short press to select the receiving frequency offset RIT, short press again to set the
transmitting frequency offset XIT. Use the left and right direction keys to set the frequency deviation
frequency. Frequency offset frequency = key display value * 20Hz.
Transceiver mode setting
Short press [MODE] button to select the mode.
In FM mode: long press to select NFM/WFM
In SSB mode: Long press to select USB/LSB
In CW mode: Ling press to select CWL/CWR
Followed by recycling AM, FM, USB (LSB), CW

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A/B frequency operation
Short press [A/B] button to switch A/B frequency, long press A frequency=B frequency.
NR/NB noise suppression setting
Short press [NR] to turn on NR/NB, short press again to switch NR/NB (normally select NR).
Short press [BW] to turn on the digital filter (green display in image), short press the left and right
direction keys to decrease the bandwidth to 4.8K.
When the NR is working, long press [DSP] to turn off NR/NB.
Spectrum and waterfall display setting
Long press the [NR] key to select and switch the display way amount Waterfall Only – Spectrum
Only – Both Waterfall and Spectrum.

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14
Application Menu Operation
Long press the [MENU] key to enter the menu interface, long press the [MENU] key to exit the
menu interface. Left and right, up and down keys to select the application, and short press the
[MENU] key to select the application.
Spectrum parameter display setting
Long press [BW] button to set spectrum
bandwidth, reference level, refresh rate, up and
down direction buttons to select setting items, left
and right direction keys to set value.
Digital filter operation
Short press [BW] key to select digital filter
(green display in image), left or right direction
key to select filter bandwidth, short press [BW]
key to ensure filter bandwidth (green will turn to
white).
SPAN: spectrum bandwidth
REF: spectrum reference level
SPEED: Spectrum refresh rate

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3. Digital compass operation (*MESSAG) – optional module
4. Bluetooth operation (*BT) – not available now
5. Music player (*MUSIC) – under developing
6. VSWR standing wave scanning
- Long press Menu button to exit
- Use the left and right keys to select BAND,
Maker and START
- Select BAND to select different bands
- Select Maker then use the left and right keys to learn the
band frequency’s standing wave value
- Select START to scan the antenna standing wave value
1. Radio operation
Use the left and right buttons to search for the channel, up and down buttons to increase or
decrease the volume. Long press to exit the radio function.
2. GPS operation (*DIR) – optional module
Directly display the UTC time, latitude and longitude, speed, direction, altitude, etc. received by
the GPS module.