Introduction
SV4401A is a handheld Vector Network Analyzer (VNA) with a measurement frequency range of 1MHz to 4.4GHz. It can measure parameters with a dynamic range of 50dB for S11 and 75dB for S21.
SV4401A is suitable for testing various types of antennas in the MF/HF/VHF /UHF/SHF frequency bands, including shortwave antennas, ISM band antennas, WiFi antennas, Bluetooth antennas, GPS antennas, and more. It can also be used to measure RF components such as filters, amplifiers, attenuators, cables, power dividers, couplers, and duplexers, and supports multiple display formats including amplitude-frequency curves, phase-frequency curves, VSWR (Voltage Standing Wave Ratio), Smith charts, polar plots, group delay, and more. Additionally, SV4401A features TDR functionality.
SV4401A adopts an all-metal casing design that effectively shields against electromagnetic interference. With dimensions of 190mm x 130mm x 30mm, it is compact and portable and includes a rear stand for convenient desktop use. The device uses N-type RF connectors and comes with N-to-SMA adapters and high-quality SMA extension cables for easy connection to various test items.
Thanks to its optimized highspeed processing system, SV4401A offers a measurement speed of 500 points per second, allowing for quasi-real-time measurements, with a maximum scan point setting of 1001 points. The 7-inch high-brightness IPS capacitive touchscreen display ensures clear visibility of screen content even in outdoor settings.
SV4401A features a full touchscreen design with four physical buttons, enabling users to quickly set frequencies, scales, trace on/off, add/delete markers, take screenshots, and perform other operations with ease.
SV4401A is equipped with two 3350mAh 18650 lithium batteries, providing over 3 hours of battery life. It charges via a USB Type-C port, and the included Type-C cable can be used for both charging and data transfer, as well as firmware upgrades.
SV4401A has a built-in 8GB storage card for storing calibration data, SNP files, screenshot images, and more.
Performance
Frequency Range：50kHz~4.4GHz Traces：7
RF Output Power：-42dBm~-12dBm Markers：8
RF Input Power：0dBm(Max) Calibration status storage slots：12
Frequency Accuracy：＜±1ppm Charging Voltage：4.7V~5.5V
S21 Dynamic Range：75dB(1.5GHz),60dB(3GHz) Memory Card：8GB TF-Card
S11 Dynamic Range：50dB(1.5GHz),40dB(3GHz) Power：5W
Scan Points：1001 Battery Life：4 hours
Scanning Speed：400 points/s
IFBW：12.5kHz(Default) 6.25k/3.12k/1k/300Hz/100Hz/30Hz
Smoothing Processing：Arithmetic Mean
Charege/Data：USB Type-C
Screen：7-inch IPS LCDw
Battery：Duo 18650 lithium batteries
Historical firmware
SV4401A_App_v0.5.9.zip
1. Port extention supported, menu path: [CAL] -> [PORT EXTENTION]；
2. New feature of saving traces in CSV format, menu path: [STORAGE] -> [SAVE TRACE]；
3. Modified the searching menu，menu path: [MARKER] -> [SEARCH]；
4. New feature of calibration kit editing, menu path: [CAL] -> [EDIT CALKIT];
5. Increased the scanning speed in the frequency range of 1M-140MHz to 400 pts/s；
6. Optimized the autoscale function；
7. Measuring status indicator added on the upper lef corner of the screen;
SV4401A_App_v0.5.1.zip
1. Added signal generator function: open it by [STIMULUS] -> [SIGNAL GENERATOR]；
2. More trace formats: MOD Z, conductance, susceptance, parallel R, parallel X, series C, series L, parallel C, parallel L；
3. Added Max hold and Min hold function: press and hold any blank part of the screen to call up the menu;
4. Logarithmic sweeping supported: open it by [STIMULUS] -> [SET FREQUENCY] -> [LOG SWEEP]；
5. The abscissa becomes the timeline in TDR mode；
6. Added auto save function: open it by [STORAGE] -> [AUTO SAVE];
7. Fixed the bug of the VSWR analysis function under SWEEP ANALYSIS;
8. Auto scale supported: open it by press and hold the trace control box to call up the menu and choose [Auto scale];
SV4401A_App_v0.4.0.zip
1. Fixed the bug that the device cannot sleep or the trace is no longer refreshed after the device is woken up；
2. Improved S11 trace noise；
3. Optimized the TDR function, when the TDR mode is turned on, other traces will be closed, and exiting the TDR mode will return to the original state；
4. Add TDR trace peak search function；
5. The SWR value is accurate to three decimal places；
6. Multilingual: Support French and Russian;
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SV4401A_App_0.3.1.zip
1. Abnormal S21 chart with 'nan' displayed;
2. Not able to set time and date；
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SV4401A_App_0.3.0.zip
1. Fixed the bug that the measurement result was displayed as NAN；
2. Fixed the bug of TDR trace abnormality；
3. Fixed the bug of RTC time;
4. SV4401A can be recognized as U-disk in Linux and MacOS systems；
5. Enable the TTL UART port to allow the host computer to communicate with SV4401A by TTL UART；
6. When browsing pictures, you can switch pictures by the LEFT & RIGHT buttons, and press CTRL to exit browsing；
7. The scanning speed increased by 30% for the frequencies below 140MHz, and increased 100% for the frequencies below 1MHz；
8. When only the S11 or S21 channel is enabled, the scanning speed is further increased to 500 points/s；
9. Added "PRESET" button to restore the device to its default settings;
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SV4401A_App_0.2.1.zip
1. Add sweep analysis function: open it through the menu [MARK] -> [SWEEP ANALYSIS]；
2. Add snp file parsing function: you can open and load local snp files in the file manager；
3. When saving the calibration state to an occupied slot, a dialog box will pop up for asking whether to overwrite；
4. Add 3 new console commands: save, recall, cal；
5. The reference traces will be automatically cleared when frequency range is changed；
6. Fixed the bug that Edelay was not updated when the calibration state was recalled；
7. Optimized the display format of the frequency range on the main screen；
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