JNCRadio VNA3G Portable Vector Network Analyzer User Manual

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 support@chelegance.com. 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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0

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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0

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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
-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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0

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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0

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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0

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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0

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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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., support@chelegance.com). 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 3G portable vector network analyzer user guide V2.0

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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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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JNCRadio VNA 3G portable vector network analyzer user guide V2.0
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