JNCRadio VNA3G Portable Vector Network Analyzer User Manual
- June 14, 2024
- JNCRadio
Table of Contents
VNA3G Portable Vector Network Analyzer
JNCRadio VNA 3G Portable Vector Network Analyzer
The JNCRadio VNA 3G is a portable vector network analyzer
designed for field measurements. It has a frequency range of 50kHz
to 3GHz and features a 4.3-inch IPS LCD and a metal case. With a
sweep speed of 400 pts/s and up to 1001 sweep points, it offers a
dynamic range of 70dB for S21 and 50dB for S11. This makes it
suitable for measuring HF/VHF/UHF antennas, filters, attenuators,
duplexers, and more.
Features:
- Frequency range: 50kHz to 3GHz
- RF output power: -10dBm to 0dBm
- Frequency accuracy
- Frequency step
For more information and support, visit the Chelegance Technology Co., Ltd.
website or contact their support team at
[email protected]. You can
also join the discussion forum at
groups.io/g/chelegance.
Usage Instructions:
Marker Functions:
The JNCRadio VNA 3G offers various marker functions:
-
ACTIVATE: Activate a marker for use.
-
PEAK: Move the marker to the peak value of the
trace. -
MINIMUM: Move the marker to the minimum value
of the trace. -
MAXIMUM: Move the marker to the maximum value
of the trace. -
TRACKING: Automatically track the maximum or
minimum value of the trace.
Operations:
The Operations menu includes the following options:
-
START: Set the frequency of the current active
marker as the start frequency. -
STOP: Set the frequency of the current active
marker as the stop frequency. -
CENTER: Set the frequency of the current
active marker as the center frequency. -
SPAN: Set the frequency range between the
current active marker and the next marker as the span.
Set Frequency:
To directly set the frequency value of the currently active
marker, tap on SET FREQ. You can also press and hold the middle
button of the side buttons to quickly call up the keyboard to set
the marker frequency.
Draggable Marker Table:
You can enable or disable the draggable characteristic of the
marker table by toggling the DRAG ON option.
Stimulus Functions:
The Stimulus menu includes various options such as setting the
start frequency, stop frequency, center frequency, span, CW pulse,
signal generator, and pause sweep.
For more detailed instructions and information, please refer to
the complete user manual available at
www.chelegance.com.
JNCRadio VNA 3G Portable Vector Network Analyzer
User manual
Rev. 2.0 (For firmware v1.3.0)
Chelegance Technology Co., Ltd.
Contents
1. Introduction ………………………………………………………………………………………………………………………………- 1 1.1.
About JNCRadio VNA 3G…………………………………………………………………………………………………- 1 1.2. Features
……………………………………………………………………………………………………………………………..- 1 1.3. Specifications
…………………………………………………………………………………………………………………….- 2 1.4. VNA
basics…………………………………………………………………………………………………………………………- 3 –
2. Appearance……………………………………………………………………………………………………………………………….- 4 3. User
interface ……………………………………………………………………………………………………………………………- 5 –
3.1. Main screen ……………………………………………………………………………………………………………………….- 5 3.2. Menu
screen………………………………………………………………………………………………………………………- 7 3.3. Keyboard screen
………………………………………………………………………………………………………………. – 8 4. Menus
……………………………………………………………………………………………………………………………………….. – 8 4.1. DISPLAY
……………………………………………………………………………………………………………………………..- 8 4.2. MARKER
………………………………………………………………………………………………………………………….. – 11 4.3.
STIMULUS……………………………………………………………………………………………………………………….. – 14 4.4. CAL
………………………………………………………………………………………………………………………………….. – 16 4.5. RECALL/SAVE
…………………………………………………………………………………………………………………. – 20 4.6.
TDR………………………………………………………………………………………………………………………………….. – 20 4.7. CONFIG
…………………………………………………………………………………………………………………………… – 24 4.8.
STORAGE………………………………………………………………………………………………………………………… – 27 5. User Defined
Information…………………………………………………………………………………………………….. – 27 6. PC
Software……………………………………………………………………………………………………………………………. – 27 7. Console
Command……………………………………………………………………………………………………………….. – 29 7.1. Command Syntax
………………………………………………………………………………………………………….. – 30 7.2. Command Description
………………………………………………………………………………………………….. – 30 8. Firmware Upgrade
………………………………………………………………………………………………………………… – 38 9. Hardware Architecture
…………………………………………………………………………………………………………. – 39 –
JNCRadio VNA 3G portable vector network analyzer user guide V2.0
1. Introduction
1.1. About JNCRadio VNA 3G
JNCRadio VNA 3G is a portable vector network analyzer with frequency range of
50k-3GHz. It is designed with 4.3-inch IPS LCD and metal case. The sweep speed
of JNCRadio VNA 3G reaches 400 pts/s, and the number of sweep points is up to
1001. With the performance of 70dB dynamic range for S21 and 50dB dynamic
range for S11, JNCRadio VNA 3G is very suitable for field measurement, such as
measuring HF/VHF/UHF antennas, filters, attenuators, duplexers, etc.
1.2. Features
Frequency range: 50k 3GHz; Dynamic range: 70dB for S21, 50dB for S11; Sweep
speed: 400 pts/s; Sweep points: up to 1001; 4.3-inch IPS LCD, ultra wide
viewing angle; All aluminum alloy case: 130mmx75mmx22mm, small and portable;
SMA RF connectors, easy to connect DUTs; Built-in 3.7V 5000mAh lithium
battery, standby time up to 5 hours; Full touching screen design, with 3 side
buttons at the same time; Built-in simple RF signal generator: up to 4.4GHz,
output power adjustable; TDR function; Support touchstone file save and
export, and files are named with RTC time; Up to 13 calibration save/recall
slots; Optimized UI design, make measurement convenient and efficiency; Screen
brightness adjustable; Firmware upgrad via virtual U disk with USB Type-C
cable; Equipped with high quality SMA calibration kit and RG316 cable; 5V/1A
USB power output port; Charging via USB Type-C, maximum charging current
reaches 2A; Compatible with nanovna-saver PC software;
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1.3. Specifications
Parameter
Specification
Conditions
Frequency range
50kHz~3GHz
RF output power
Max RF input power Frequency accuracy Frequency step
-10dBm -9dBm -12dBm -14dBm 0 dBm <±0.5ppm 10kHz (Min)
50kHz – 140MHz 140MHz – 1GHz 1GHz – 2GHz 2GHz – 3GHz DC < 5V
S21 dynamic range
80dB 70dB
50kHz – 1.5GHz 1.5GHz – 3GHz
S11 dynamic range
50dB 40dB
50kHz – 1.5GHz 1.5GHz – 3GHz
Sweep points
501
11-1001 configurable
Traces
4
Markers
4
Calibration storage
13
Sweep speed
400 pts/s
Display
4.3-inch IPS LCD with RTP Resolution: 800*480
Battery
3.7V 5000mAh
Charging/Data port USB Type-C
USB-A to USB Type-C cable only
Charging voltage
4.7V – 5.5V
Power output
USB-A 5V/1A
RF connector
SMA
Dimensions
1307522mm
Shell material
Aluminum alloy
Operation temperature 0-45
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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
1.4. VNA basics
Vector Network Analyzer (VNA is the most commonly used instrument in the field
of RF and microwaveVNA measures the reflection and transmission behavior of a
device under test (DUTacross a configured frequency range. VNA is usually used
to measure antenna impedance, cable loss, filters, power splitters, couplers,
duplexers, amplifiers, etc. Note that the “network” mentioned here does not
refer to a computer networks. When the name “network analyzer” was coined many
years ago, there ware no such things as computer networks. Back then, networks
always referred to electrical networks. Today, when we refer to the things
that network analyzers measure, we speak mostly about devices and components.
JNCRadio VNA 3G is a dual-port portable vector network analyzer that can be used to measure the S11 parameters of a single-port network, or to measure the S11 and S21 parameters of a dual-port network. If you need to measure the S22 and S12 parameters of the dual-port network, you can achieve it by exchanging the measurement ports. VNA must be calibrated before any measurements are performed. See section 4.4 for details.
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2. Appearance
JNCRadio VNA 3G portable vector network analyzer user guide V2.0
800×480 IPS LCD + RTP
Charge/Data
Power output
Push buttons
Power switch
Power Indicator
PORT1
PORT2
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3. User interface
3.1. Main screen
8
7
JNCRadio VNA 3G portable vector network analyzer user guide V2.0
5
9
10
6
3
1
4
11
2
START/CENTER frequency
The START/CENTER frequency is shown in this area. STOP/SPAN frequency
The STOP/SPAN frequency is shown in this area. Marker
Up to 4 markers can be displayed at the same time. The active marker can be
moved to any of the measured points in the following 2 ways:
Push the UP or DOWN buttons. Drag the marker on the touchscreen (recommend to
operate with a stylus).
Calibration status
O: Indicates OPEN calibration has been performed. S: Indicates SHORT calibration has been performed. L: Indicates LOAD calibration has been performed. T: Indicates THROUGH calibration has been performed.
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C: Indicates that the device has been performed a calibration. *: Indicates
that the calibration data has not been stored and will be lost when power off.
c: Indicates that the calibration data is Interpolated. Cn: Indicates that the
corresponding calibration data is loaded (13 sets from 0 to 12).
Reference position
Indicates the reference position of the corresponding trace. You can change
the position by: DISPLAYREF POS
Marker Table
Up to 4 sets of marker information can be displayed at the same time, each set
of marker information includes frequency and 2 other parameters. The diamond
mark in front of the marker table indicates which is the active marker. You
can open, select or close a marker by:
MARKERSELECTMARKER n To quickly activate a marker, you can tap on the
frequency value region of the corresponding row of the marker table (recommend
to operate with a stylus).
Trace status box
The status of each trace format and the value corresponding to the active
marker are displayed. For example, if the display is showingS21 LOGMAG 10dB/
0.03dB, read it as follows:
The cyan trace is current active Channel: PORT2 (transmission) Format: LOGMAG
Scale is 10dB/div S21 value at current frequency is 0.03dB Tap on any set of
trace status box will activate the corresponding trace. If the trace is
active, tap on the specific region of the trace status box will trigger
shortcuts: Tap on “channel” region (e.g., S21) will quickly switch channel;
Tap on “format” region (e.g., LOGMAG) will quickly open the FORMAT menu; Tap
on “scale” region (e.g., 10dB/) will quickly open SCALE and REFERENCE POSITION
menu.
channel region: tap here to quick switch channel format region: tap here to
quick open format menu scale region: tap here to quick open scale menu
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Battery level The battery level and voltage are shown here. If the battery
voltage is lower than 3.3V, please charge the device. Left ordinate The left
ordinate always shows the scale label of trace 0. Tap on the area of left
ordinate to quickly set the scale of trace 0. Right ordinate The right
ordinate always shows the scale label of current active trace. Tap on the area
of right ordinate to quickly set the scale of current active trace. Sweep
points Show sweep points.
3.2. Menu screen
The menu can be opened by the following operations: Tap on the specific area of the screen (shown in the red frame above). Press the middle button.
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3.3. Keyboard screen
JNCRadio VNA 3G portable vector network analyzer user guide V2.0
The virtual keyboard includes numeric keys, backspace key, unit key, ok key.
Backspace key is used to delete one character. When the input box is empty, tap on the backspace key will close the keyboard.
Unit key(G, M, k) multiplies the current input by the corresponding unit and terminates input immediately.
Ok key equals to x1, in case of ok, the entered value is set as it is.
E.g.100kHz
input 100 + k, or input 100000 + Ok
433.92MHz input 433.92 + M
2.4GHz
input 2.4 + G
4. Menus
4.1. DISPLAY
DSIPLAYmenu containsTRACE,FORMAT,SCALE,REF POS,CHANNEL
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4.1.1 TRACE
TRACEmenu containsTRACE 0,TRACE 1,TRACE 2,TRACE 3.
Tap on TRACE n(e.g., TRACE 2) will open and activate TRACE 2, and an A marker
will appear ahead of “TRACE 2”. Tap on another menu item (e.g., TRACE 3) will
open and activate TRACE 3, at this time, an A marker will appear ahead of
“TRACE 3”, and the A marker ahead of “TRACE 2” becomes , which means TRACE 2
and TRACE 3 are both opened and TRACE 3 is current active.
When a trace is active, the channel region of the trace in trace status box
will be highlighted, as shown in the figure above, S11 is highlighted. Tap on
the menu item with A marker will close the corresponding trace.
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4.1.2 FORMAT
FORMATis used to set the format of traces. There are formats of LOGMAG, PHASE,
DELAY, SMITH R+jX, SMITH R+L/C, SWR, Q FACTOR, POLAR, LINEAR, REAL, IMAG,
RESISTANCE, REACTANCE.
LOGMAG the ordinate corresponds to logarithmic amplitude and the abscissa
corresponds to frequency.
PHASEthe ordinate corresponds to phase and the abscissa corresponds to the
frequency. DELAY the ordinate corresponds to group delay and the abscissa
corresponds to frequency. Only meaningful for S21. SMITH R+jXshow impedance
with Smith chart. Impedance is displayed in the form of R+jX. Only meaningful
for S11.
SMITH R+L/C: show impedance with Smith chart. Impedance is displayed in the
form of R+L/C, where R is the resistance value and L/C is the equivalent
inductance or capacitance value. Only meaningful for S11.
SWRthe ordinate corresponds to VSWR and the abscissa corresponds to frequency.
Only meaningful for S11.
Q FACTORthe ordinate corresponds to Q factor, and the abscissa corresponds to
frequency.
POLARshow impedance in polar coordinates. Only meaningful for S11. LINEARthe
ordinate corresponds to linear amplitude, and the abscissa corresponds to
frequency. REALthe ordinate corresponds to the real part of S parameter, and
the abscissa corresponds to frequency. IMAGthe ordinate corresponds to the
imaginary part of S parameter, and the abscissa corresponds to frequency.
RESISTANCEthe ordinate corresponds to resistance, and the abscissa corresponds
to frequency. REACTANCEthe ordinate corresponds to reactance, and the abscissa
corresponds to frequency.
There are 3 ways to activate a trace: 1DISPLAYTRACETRACE n. 2Tap on the format
region of the corresponding trace in the trace status box. 3Tap on any markers
with the same color to the trace.
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4.1.3 SCALE
SCALEis used to set the scale of the ordinate (not applicable to SMITH and
POLAR formats).
4.1.4 REF POS
REF POSis used to set the reference position of the trace (not applicable to
SMITH and POLAR formats). Ref pos is set to 7 by default, which corresponds to
the 7th horizontal axis counting from bottom to top (0 corresponds to the
bottom horizontal axis). Ref pos can be set to any integer.
4.1.5 CHANNEL
Tap onCHANNELto switch the channel of current active trace.
4.2. MARKER
MARKERmenu containsSELECT,SEARCH,OPERATIONS,SET FREQDRAG ON.
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4.2.1 SELECT
SELECTmenu containsMARKER 1,MARKER 2,MARKER 3,MARKER 4,ALL OFF,POSITION.
Tap onMARKER n(e.g.,MARKER 2) will open and activate MARKER 2, and an A marker
will appear ahead of “MARKER 2”. Tap on another menu item (e.g., MARKER 3)
will open and activate MARKER 3, at this time, an A marker will appear ahead
of “MARKER 3”, and the A marker ahead of “MARKER 2” becomes , which means
MARKER 2 and MARKER 3 are both opened and MARKER 3 is current active. Tap on
the menu item with A will close the corresponding marker.
The marker can be moved with the buttons only when it is active. There are two
ways to quickly activate a marker:
1 Tap on the marker directly, as shown by the red arrow of the figure above
(recommend to operate with a stylus).
2Tap on the frequency value region of the corresponding marker in the marker
table, as shown in the red box of the above (recommend to operate with a
stylus).
ALL OFFis used to turn off all markers at once.
POSITIONis used to adjust the position of the marker table on screen. The
marker table can be moved up and down to avoid occluding traces and markers.
It is possible to move the marker table by dragging: make sure thatDRAG ONis
enabled, and then tap on the marker value region (as shown in the green box of
the figure above) and hold for more than 1 second, then you can drag and move
the marker table freely (recommend to operate with a stylus).
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4.2.2 SEARCH
SEARCHmenu contains MAXIMUM,MINIMUM,SEARCH < LEFT,SEARCH > RIGHT,TRACKINGand
all the functions are effective for the currently active marker.
TRACKINGis used to automatically track the maximum or minimum value of the
trace. As shown in the figure above, if you want MARKER 2 to automatically
track the minimum value of the S11 LOGMAG trace, firstly you should activate
MARKER 2, and then tap onMINIMUM, and finally turn onTRACKING. After doing
that, MARKER 2 will automatically move to the valley point of the S11 LOGMAG
trace after each sweep.
4.2.3 OPERATIONS
OPERATIONSmenu contains>START,>STOP,>CENTER,>SPAN. >STARTSet the frequency of
the current active marker as the start frequency. >STOPSet the frequency of
the current active marker as the stop frequency. >CENTERSet the frequency of
the current active marker as the center frequency. >SPANSet the frequency
range between the current active marker and the next marker as the span. If
there are no other markers behand the current active marker, the span will be
set to zero.
4.2.4 SET FREQ
To directly set the frequency value of the currently active marker. You can
also press and hold the middle button of the side buttons to quickly call up
the keyboard to set the marker frequency.
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4.2.5 DRAG ON
Enable/disable the draggable characteristic of marker table.
4.3. STIMULUS
STIMULUSmenu containsSTART, STOP, CENTER, SPAN, CW PULSE, SIGNAL
GENERATOR,PAUSE SWEEP.
4.3.1 START
Tap onSTARTto set the start frequency. You can also tap on the red box area of
the above figure to quickly set the start frequency.
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4.3.2 STOP
Tap onSTOPto set the stop frequency. You can also tap on the yellow box area
of the above figure to quickly set the stop frequency.
4.3.3 CENTER
Tap onCENTERto set the center frequency. You can also tap on the red box area
of the above figure to quickly set the center frequency.
4.3.4 SPAN
Tap onSPANto set the frequency span. You can also tap on the yellow box area
of the above figure to quickly set the frequency span.
4.3.5 CW PULSE
Tap onCW PULSEto set the CW pulse frequency. You can also tap on the red box
area of the above figure to quickly set the CW pulse frequency. Please note
that in this mode the output of PORT 1 is pulse signal, not continuous wave.
4.3.6 SIGNAL GENERATOR
SIGNAL GENERATORJNCRadio VNA 3G supports simple signal generator function,
which can be set as a single-frequency continuous wave generator with a
frequency range from 50kHz to 4400MHz. RF power is adjustable above 135MHz.
RF OUTTurn on/off the RF output. FREQSet the frequency. 0dBOutput power attenuated 0dB. -3dBOutput power attenuated 3dB.
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-6dBOutput power attenuated 6dB. -9dBOutput power attenuated 9dB.
4.3.7 PAUSE SWEEP
Tap onPAUSE SWEEPto pause sweep, tap again to resume sweep.
4.4. CAL
CALmenu containsCALIBRATE,RESET,APPLY.
4.4.1 APPLY
APPLYis turned on by default, indicating that the calibration data has been
applied. Tap on APPLYto turn it off. After doing that, the calibration status
Cn at the bottom of the main screen will disappear, indicating that the
measurement result is uncorrected.
4.4.2 RESET
Tap onRESETto clear the calibration data in the memory. After doing that, the
calibration status OSLT Cn at the bottom of the main screen will disappear,
but the calibration data stored in the internal FLASH will not be cleared. You
can call back the calibration data to the memory by
RECALL/SAVERECALLRECALL n
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4.4.3 CALIBRATE
Tap onCALIBRATEto perform calibration. The following accessories need to be
prepared
before calibration: 1SMA OPEN kit; 2SMA SHORT kit; 3SMA LOAD kit; 4SMA-JJ
RG405 cable; 5SMA straight through adapter (optional);
OPEN
SHORT
LOAD
Firstly, you need to set an appropriate frequency range, see section 4.3 for
detail.
Tap onCALIBRATEto enter the calibration interface, and perform the calibration
according to the following steps:
STEP Connect the OPEN kit to PORT1 or the end of the cable connected to PORT1,
as shown in the figure below:
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Cable (optional)
Calibration kit
JNCRadio VNA 3G
Tap onOPEN, the device emits a beep, and the menu turns gray and is
inoperable. Wait for 2-3 seconds, the device emits a beep again, a marker will
appear ahead of “OPEN”, and a
letter “O” appears at the bottom of the screen, indicating that open
calibration is finished.
NOTE: usually we need to connect the DUT to VNA with cables, at this time, the
cable becomes a part of the measurement system, and the end of the cable
should be treated as the VNA port during calibration.
STEP Connect the SHORT kit to PORT1 or the end of the cable connected to
PORT1, tap onSHORT to complete the short calibration.
STEP Connect the LOAD kit to PORT1 or the end of the cable connected to PORT1,
tap onLOAD to complete the load calibration.
STEP Connect PORT1 and PORT2 with cable and adaptor (optional), as shown in
the figure below, then tap onTHROUGHto complete the through calibration.
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Cable
JNCRadio VNA 3G portable vector network analyzer user guide V2.0
Adaptor (optional)
JNCRadio VNA 3G
STEP Tap onDONE, OSLT C* will appear at bottom of the screen, indicating that
the calibration
data has been generated but not yet saved. The save menu will appear on the
right side of the screen at the same time. Tap onSAVE nto save the calibration
data, and the frequency range
of the calibration data will be display on the menu item. The saving progress
may take a bit time,
please wait until the dialog box closes automatically.
When properly calibrated, the VNA device should have the following
characteristics:
(1) When PORT1 is open-circuited, the S11 Smith trace converges on the far-
right side of the Smith chart, the S11 LOGMAG trace is near 0dB, for S21
LOGMAG trace, the lower the better.
(2) When PORT1 is short-circuited, the S11 Smith trace converges on the far-
left side of the Smith chart, the S11 LOGMAG trace is near 0dB, for S21 LOGMAG
trace, the lower the better.
(3) When PORT1 is connected to a 50-ohm load, the S11 Smith trace converges at
the center of the Smith chart. The lower the S11 and S21 LOGMAG trace, the
better.
(4) When PORT1 and PORT2 connected by a cable, the S11 Smith trace is near the
center of the Smith chart, and the S21 LOGMAG trace is near 0dB. For S11
LOGMAG trace, the lower the better.
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4.5. RECALL/SAVE
RECALL/SAVEmenu containsRECALLandSAVE.
4.5.1 RECALL
Tap onRECALL nto recall calibration data and settings stored in slot n. The
marker indicates which calibration data has been recalled.
4.5.2 SAVE
Tap onSAVE nto save calibration data and settings to one of 13 save slots.
4.6. TDR
JNCRadio VNA 3G has a TDR function that can be used for cable length
measurement and cable fault detection. TDRmenu contains TDR ON, LOW PASS
IMPULSE, LOW PASS STEP, BANDPASS, WINDOW,VELOCITY FACTOR. Tap onTDR ONto turn
on TDR.
4.6.1 Cable length measurement
As TDR only makes sense for S11, it is recommended that all the traces be
turned off except the S11 trace. The maximum cable length (Lmax) that can be
measured by TDR is determined by the following formula:
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Lmax
=
1 2
×
1
×
×
Where C represents the electromagnetic wave speed in vacuum, VF is velocity factor of the cable, and is frequency step defined by
=
SPAN N-1
Where SPAN is the frequency spanN is the sweep points.
Let’s demonstrate the measurement steps for the 20cm RG316 cable that comes
with the device
as an example.
For the default setting of 50kHz to 3GHz frequency range and 501 sweep points,
the Lmax is 17.5 meters with VF of 70%, which is too long for the 20cm cable.
As we can see from the above formula, the Lmax is inversely proportional to
the frequency SPAN and proportional to the sweep points, so we can reduce the
Lmax by reducing the sweep points. For this demonstration, let’s go to the
menu of CONFIGSWEEP SETUPSWEEP POINTSto set the sweep points to 51.
Velocity factor is defined as the ratio of the transmission speed of electromagnetic waves in the transmission line to the transmission speed of electromagnetic waves in vacuum. TapVELOCITY FACTORto set the velocity factor. E.g., the typical velocity factor of RG316 cable is 0.7, you should input 70 via the virtual keyboard and end up with Ok, then the velocity factor will be set to 70%.
After finishing the sweep points setting, there is one more important step:
please set the S11 format to LINEAR for the cable length measurement.
Now we can connect the cable to PORT1, keep the other end of the cable open or
short, confirm that BANDPASS is selectedkeep other settings by default, then
tap onTDR ON to turn on TDR, and the TDR trace will be displayed.
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To get the cable length value, please open the menuMARKERSEARCHMAXIMUM to move
the marker to the peak of the trace, and the estimated cable length will be
displayed on the screen. In signal processing, we typically perform truncation
analysis on signals, and if the signal is truncated to non-periodic
truncation, then spectral leakage will occur. By adding windows, the leakage
of the spectrum can be reduced. There are three levels of windowing:
MINIMUMNORMAL,MAXIMUM , and NORMALis default setting. Here is a comparison of
the different windows:
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4.6.2 Cable fault detection
Let’s take the included 20cm RG316 cable again as an example. Connect the
cable to PORT1 of the VNA and leave the other end of the cable unconnected.
Please set the S11 format to REAL for cable fault detection: go to the
menuDISPLAY FORMATMOREand selectREAL.
Now please go to the menu ofTDRand selectLOW PASS STEPand tap onTDR ON to turn
on TDR. A rising edge on the TDR trace indicates there is an open fault on the
cable. Move the marker to the rising edge to get the distance of the open
point to PORT1. A falling edge on the TDR trace indicates there is a short
fault on the cable. Move the marker to the falling edge to get the distance of
the short point to PORT1.
LOW PASS IMPULSE is another signal processing mode for cable fault detection.
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4.7. CONFIG
CONFIG menu contains SWEEP SETUP,PRESET,DATE/TIME,TOUCH TEST,
LANGSET,ABOUT,BRIGHTNESS.
4.7.1 SWEEP SETUP
SWEEP SETUPmenu containsELECTRICAL DELAY,L/C MATCH,SWEEP POINTS.
4.7.1.1 ELECTRICAL DELAY
ELECTRICAL DELAYis used to set a delay time in nanoseconds (ns) or picoseconds
(ps) to compensate for the delay introduced by connectors or cables.
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4.7.1.2 L/C MATCH
JNCRadio VNA 3G supports automatic calculation of L/C matching parameters, matching the load impedance to the source 50ohm impedance. The structure of L/C matching network is shown in the figure below:
Source
Series
Load
Src shunt
Load shunt
Example: The measured load impedance is 23.2-58.4j, and VNA automatically generates four groups of available matching parameters: 1. 7.94pF capacitor for source shunt and 30.9nH inductor in series; 2. 17.3nH inductor for source shunt and 12.4nH inductor in series; 3. 65.3nH inductor for load shunt and 28.7nH inductor in series; 4. 15.5nH inductor for load shunt and 4.78pF capacitor in series.
4.7.1.3 SWEEP POINTS
Sweep points are configurable from 11 to 1001.
4.7.2 PRESET
When preset, the VNA will be restored to its factory state.
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4.7.3 DATE/TIME
User can set the date and time on the VNA, and the setting method is displayed
on the UI.
4.7.4 TOUCH TEST
TOUCH TESTis used to test the touch screen. Press any button to exit testing
mode.
4.7.5 LANGSET
Set language: Chinese Simplified or English.
4.7.6 ABOUT
You can check the hardware version, firmware version, serial number and user
information, etc. Each JNCRadio VNA 3G device has a unique serial number,
SYSJOINT provides after-sales service to customers based on this serial
number.
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4.7.7 BRIGHTNESS
The backlight brightness is adjustable in five levels: 100%80%60%40%20%.
4.8. STORAGE
STORAGEmenu containsS1P,S2P,LIST.
4.8.1 S1P
S11 test results can be stored to the internal memory of JNCRadio VNA 3G in
the form of S1P files, which can be exported to PC with USB cable.
4.8.2 S2P
S11 and S21 test results can be stored to the internal memory of JNCRadio VNA
3G in the form of S2P files, which can be exported to PC with USB cable.
4.8.3 LIST
List all the SNP files stored in the device.
5. User Defined Information
JNCRadio VNA 3G supports displaying user-defined information on the boot
screen. The setting method is as follows: 1. Create a text file named
info.txt’ on PC; 2. Openinfo.txt’ and input the string which you want to be
displayed on the boot screen (printable ASCII characters only, e.g.,
[email protected]). The maximum string length is 50. 3. Make JNCRadio VNA
3G enter virtual u-disk mode, and copy `info.txt’ into the virtual u-disk. 4.
Restart JNCRadio VNA 3G.
6. PC Software
PC software download: http://www.sysjoint.com/file/Nanovna-Saver-0.3.10-by-
SYSJOINT.exe For Win10 system, you do not need to install the driver. For Win8
and earlier versions of the Windows system, you need to install the driver:
https://www.st.com/en/development-tools/stsw-stm32102.html Connect JNCRadio
VNA 3G to your PC with the USB Type-C cable, as shown in the figure below:
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JNCRadio VNA A 3G
USB type-c
Important Note: Only USB-A to USB Type-C cables can be used for charging and data transfer.
Double click “nanovna-saver.exe” to run the PC software, and select the correct COM port. If there is no COM port detected, please click Rescan. After selecting the correct COM port, clickconnect to deviceto connect the device to PC.
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In the PC software, user can set the start and stop frequency, get the
measurement results, set the marker, take a screenshot, etc. It is possible to
get the device screen dump through the PC software:
1 ClickManageto open `Device setting’ dialog box. 2 ClickScreenshotand wait
for about 5 seconds. 3 Move the mouse to the image area, right-click and
select “Save Image” to save the
screenshot image to local disk.
7. Console Command
JNCRadio VNA 3G supports character console commands, you can interact with the
device through serial tools (such as PuTTY).
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It is also possible to design a customized PC software according to the
commands. The serial port baud rate of JNCRadio VNA 3G is adaptive, usually we
choose a baud rate of 115200, as shown in the figure below:
7.1. Command Syntax
A command line is a string of characters sent from PC to JNCRadio VNA 3G. A
command line has a command, a body, and a terminator. Each command line must
begin with a command and must be terminated by a carriage return. The command
line is a string of printable ASCII characters (032 – 126). Space characters
(ASCII 032) and control characters other than CR (ASCII 013) and BS (ASCII
010) in the command string are ignored. The default terminator is the ASCII
7.2. Command Description 7.2.1 help
Use this command to list all the registered commands:
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7.2.2 reset
This command is used to reset the device. No parameters are required for this
command. After using this command, the device will restart, and the USB will
disconnect, so you need to restart the serial tool and reconnect.
7.2.3 cwfreq
This command is used to set the CW pulse frequency. The command contains one
parameter (frequency in Hz). For example, set the CW pulse frequency of
450MHz:
cwfreq 450000000
7.2.4 saveconfig
This command is used to save language setting and touch calibration. No
parameters are required for this command.
7.2.5 clearconfig
This command is used to restore the device to factory settings. This command
requires a fixed parameter: `1234′
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clearconfig 1234
JNCRadio VNA 3G portable vector network analyzer user guide V2.0
CAUTION: Sending this command will cause all settings and calibration data get
lost.
7.2.6 data
This command is used to get the measurement data. The optional parameter
[array] is used to specify the channel: 0 for s11, 1 for s21. When there is no
parameter, executing this command will print s11 data by default.
7.2.7 frequencies
This command is used to get the frequency list of the sweep. No parameters are
required for this command.
7.2.8 scan
This command is used to set start frequency, stop frequency, sweep points, and
the printout format of the measurement results.
scan {start(Hz)} {stop(Hz)} [points] [outmask]
Parameter descriptions:
start
Star frequency
stop
Stop frequency
points
Sweep points, range from 11 to 501
0: No printout;
1: Print the frequency value of each sweep point;
2: Print s11 data of each sweep point;
outmask
3: Print frequency value and s11 data of each sweep point; 4: Print s21 data of each sweep point;
5: Print frequency value and s21 data of each sweep point;
6: Print s11 data and s21 data of each sweep point;
7: Print frequency value, s11 data and s21 data of each sweep.
Example: Set frequency range 200MHz – 500MHz, 11 points, print frequency value, s11 data and s21 data:
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As shown in the figure above, the first column is the frequency value of each
sweep point, the second column is the real part of s11 data, the third column
is the imaginary part of s11 data, the fourth column is the real part of s21
data, and the fifth column is the imaginary part of s21 data.
7.2.9 sweep
This command is used to set sweep mode, frequency, and sweep points. There are
two ways to use sweep command. Usage1:
sweep [start(Hz)] [stop(Hz)] [points] If there is no parameter, executing this
command will print the current sweep range and points; For the case of one
integer parameter, the parameter is interpretated as start frequency; For the
case of two integer parameters, parameters are interpretated as start and stop
frequencies. For the case of three integer parameters, the first two
parameters are interpretated as start and stop frequencies, the third
parameter is interpretated as sweep points. Example: set start frequency to
200MHz, stop frequency to 500MHz, and sweep points to 78.
sweep 200000000 500000000 78
Usage2: sweep [start|stop|span|center|cw|points] [value]
Parameter descriptions:
start
Set start frequency
stop
Set stop frequency
span
Set span frequency
center
Set center frequency
cw
Set CW frequency
points
Set sweep points, range from 11 to 201
value
Frequency value in Hz or sweep points
Example: set start frequency to 200MHz.
sweep start 200000000
7.2.10 touchcal
This command is used to calibrate the touchscreen. When executing this
command, a cross will appear in the upper left corner of the screen, tap the
center of the cross (recommended to operate with a stylus), then a second
cross will appear in the lower right corner of the screen, tap the center of
the second cross to complete the touch screen calibration.
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Tap the center of the second cross
Note: After completing the calibration of the touch screen, you MUST execute
saveconfig command to save the calibration data.
7.2.11 touchtest
This command is used to test whether the touch pad is correctly calibrated.
After sending this command, user can draw on the screen (recommended to
operation with a stylus) to check whether the touch operation is accurate.
7.2.12 pause
Execute this command to pause sweep.
7.2.13 resume
Execute this command to resume sweep.
7.2.14 cal
This command is used for calibration. Usage:
cal [load|open|short|thru|done|reset|on|off]
Parameter descriptions:
no parameter
Get the calibration status of the device
load
Perform load calibration
open
Perform open calibration
short
Perform short calibration
thru
Perform thru calibration
done
Complete calibration
reset
Clear calibration data
on
Apply calibration
off
Disapply calibration
NOTE: Please send command `cal reset’ before performing calibration. When calibrating, please firstly connect the calibration kit to the SMA port of the device, wait for 2-3 sweeps, and then send the corresponding cal command.
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7.2.15 save
This command is used to save calibration data, and it can also save the trace
settings and the marker table position. The parameter id’ indicates the storage slot number of the calibration data, the value range is 0-6. save {id} 7.2.16 recall This command is used to recall the calibration data stored in the device, and it can also recall the trace settings and the marker table position. The parameterid’ indicates to the storage slot number of the calibration data,
the value range is 0-6. recall {id}
7.2.17 trace
This command is used to view or set the attributes of trace. Usage: trace
[0|1|2|3|all] [{format}|scale|refpos|channel|off] [value] If there is no
parameter, sending this command will get the attributes (format, channel,
scale, and reference position) of all the opened traces. Example: get the
attributes of all the opened traces:
For the case of one parameter, the parameter indicates to the trace number.
Sending this command will get the attributes of the corresponding trace.
Example: get the attributes of trace 0:
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For the case of two parameters, the first parameter indicates to the trace
number, the second parameter indicates to the trace format (logmag, phase,
smith, linear, delay, swr). Example: set trace 0 format of swr: trace 0 swr
Example: turn off all traces: trace all off
For the case of three parameters, the first parameter indicates to the trace
number, the second parameter can be scale’,refpos’ or `channel’, the third
parameter is used to specify the value of scale, reference position or
channel. Example: set trace 0 scale of 15 trace 0 scale 15
Example: set trace 1 reference position of 5 trace 1 refpos 5 Example: set
trace 0 channel to S21 (0 for S11 and 1 for S21) trace 0 channel 1
7.2.18 marker
This command is used to view or set the attributes of markers. Usage: marker
[1|2|3|4] [on|off|{index}|
If there is no parameter, sending this command will get the attributes (index,
frequency) of all the opened markers. Example: get the attributes of all the
opened markers:
For the case of one parameter, the parameter indicates to the marker number, sending this command will get the attributes (index, frequency) of the corresponding markers. Example: get the attributes of marker 1:
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For the case of two parameters, the first parameter indicates to the marker
number, the second parameter can be on’,off’ or index value, which is used
to turn on/off or move the marker to the specified position.
Example: turn off marker 1: marker 1 off
Example: move marker 1 to 56th sweep point. marker 1 56
7.2.19 edelay
This command is used to set delay time to compensate the electrical delay
introduced by connectors and cables. Usage: edelay [value] If there is no
parameter, sending this command will get the current edelay value. For the
case of one parameter, the parameter indicates to the delay time in ns, and
the value can be either positive or negative.
Example: set edelay time -100ps edelay -0.1
7.2.20 capture
This command is used to get the screenshot. No parameters are required for
this command. Data is transmitted in hexadecimal little-endian mode. One pixel
is composed of 16 bits and divided into two bytes. The screenshot data is sent
in the format of line scan. Since the screen resolution is 800*480, the
screenshot image is transmitted in 480 times, 800 pixels per transfer.
7.2.21 version
This command is used to check the firmware version. No parameters are required
for this command.
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7.2.22 info
This command is used to get the device information. No parameters are required
for this command.
7.2.23 sn
This command is used to get the unique 12-bit serial number of the device. No
parameters are required for this command.
7.2.24 resolution
This command is used to get the LCD resolution. No parameters are required for
this command.
7.2.25 lcdid
This command is used to get the LCD ID. No parameters are required for this
command.
7.2.26 rtc
This command is used to view or set the RTC time. If you want to set the RTC
time, please follow the format of YY-MM-DD HH:MM:SS.
Example: set RTC time 2021-12-17 18:07:30 rtc 21-12-17 18:07:30
If you want to get the RTC time of the device, no parameters are required.
8. Firmware Upgrade
The firmware of JNCRadio VNA 3G can be upgraded through virtual U-disk without
a programmer (such as J-LINK). The upgrade can be done with the USB Type-C
cable.
Connect JNCRadio VNA 3G to PC with the USB Type-C cable, push and hold the
middle push button, then power on JNCRadio VNA 3G. The device will be
recognized as a U disk drive, and the following prompt information will appear
on the device screen.
Firmware upgrade: 1. Connect the device to PC with Type-C cable; 2. The device
will be recognized as a U-Disk; 3. Copy `vnaApp.bin’ into the U-Disk; 4. Power
off and on;
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According to the prompt information, the file vnaApp.bin’ is required, which can be downloaded from our official website: www.chelegance.com/ Download the firmware file and unzip it to getvnaApp.bin’. Copy `vnaApp.bin’ to the root
directory of the U-Disk, it may take 10-15 seconds. Power off and on the
device, the firmware upgrade will complete automatically. When the firmware
upgrade complete, the device will restart automatically, you can check the
firmware version when the device startup.
9. Hardware Architecture
PORT1
Coupler
High Freq Synthesizer
Low Freq Synthesizer
High Freq Synthesizer
PORT2
Power Management
Li-Po 5000mAh
Mixer
Baseband Amplifier
USB type-c
16MB flash
Button x 3
IPS LCD 800×480
RTC
MCU
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References
- [email protected] | Home
- Chelegance – Portal to verified Ham Radio Products
- [email protected] | Home