🧗 🥝 👌🏻 Laboratory bench for studying characteristics of wire antennas based on NanoVNA-F V2 💟 👉🏿 👥

Recently, I bought myself on Aliekspress Vector Network Analyzer Portable SAA-2-the F V2 NanoVNA , tester the VHF of HF [1] .

This device was developed in China - link to the developer and description of the device [2] .

Instruction (English) [3] . And one more instruction [4] .

The device is convenient for its portability and the ability to measure circuit parameters in the frequency range from 50 kHz to 3 GHz, in particular S11 and S21 . Convenience also lies in the fact that the device can be connected to a computer (laptop, tablet) via USB and on the computer to analyze the obtained measurements. I found that in the area of the power switch you can see a green LED inside the case, which is not brought out, it indicates the measurement mode with a glow, no glow is the indication mode, in the absence of a frequency swing, the LED is off.

To begin with, I measured the SWR of all the wire antennas I have in stock. The results were encouraging.

After, I found at the end of the manual that this device can be controlled via a virtual COM port by connecting to a computer via a USB type3 cable (included in the kit) and using any terminal program with standard settings and a baud rate of 115200. Connection parameters port = 'COM3' ( it was determined in my computer), baudrate = 115200, bytesize = 8, parity = 'N', stopbits = 1, timeout = 0.05, xonxoff = False, rtscts = False, dsrdtr = False.

The command system of the device is shown in Table 1. The results were obtained experimentally by analyzing the descriptions of other similar devices [5] on the device with the specified firmware using the free terminal program YAT - [6] .

Table 1 - Instrument command system (firmware version 0.2.1) (information displayed by the instrument is shown in bold)


help	lists all the registered commands ( )
reset	reset ( , ( info) )
cwfreq	cwfreq {frequency(KHz Hz)} ( )
saveconfig	saveconfig ( )
clearconfig	clearconfig {protection key} ( – )
data	data [array] ( Re(S11), Im(S11)) 0.363578 0.933056 0.362326 0.932676 0.364149 0.930980
frequencies	frequencies ( ) 470000 471600 473200
port	port {1:S11 2:S21} ( )
scan	scan {start(Hz)} [stop] [points] [outmask] scan 500000000 600000000 201 7 ( – , – , – - 51-201, 1 7). = 1 – F(). 470000 471600 473200 = 2 – Re(S11), Im(S11) 0.363578 0.933056 0.362326 0.932676 0.364149 0.930980 = 3 - F(), Re(S11), Im(S11) 470000 0.362643 0.932495 471600 0.362860 0.933308 473200 0.365720 0.931944 = 4 – Re(S21), Im(S21) 0.000012 -0.000058 0.000019 -0.000046 -0.000022 -0.000048 = 5 - F(), Re(S21), Im(S21) 470000 0.000008 -0.000076 471600 -0.000007 -0.000034 473200 0.000012 -0.000032 = 6 – Re(S11), Im (S11), Re(S21), Im(S21) 0.365253 0.932604 0.000006 -0.000056 0.366460 0.931959 0.000044 -0.000022 0.361891 0.934809 -0.000003 -0.000063 = 7 – F(), Re(S11), Im(S11), Re(S21), Im(S21) 470000 0.366976 0.931118 0.000007 -0.000033 471600 0.363688 0.933452 0.000038 -0.000017 473200 0.364893 0.931143 0.000015 -0.000005 – 201 , - , , 201 . , pause. , , resume.
sweep	sweep {start(Hz)} [stop] [points] ( )
touchcal	touchcal ( )
touchtest	touchtest ( )
pause	pause ( )
resume	resume ( )
cal	cal [load\|open\|short\|thru\|done\|reset\|on\|off\|in] ( ) cal reset – ( ). cal open – Port1. cal short – Port1. cal load – 50 Port1. cal thru – Port1-Port2. cal done – ( save ). cal on – . cal off – . cal in – , .
save	save {id} ( 0-7)
recall	recall {id} ( 0-7)
trace	trace {id} ( 0-3, , ) 0 LOGMAG S11 1.000000 7.000000 1 SMITH S11 1.000000 0.000000 ( – (0-3), – , , (0-8))
marker	marker [n] [off\|{index}] 1 0 598000 2 40 601200 3 59 602720 4 81 604480 ( – (1 - 4), , , – )
edelay	edelay {id} 0.330000 ( (330 ps) – )
pwm	pwm {0.0-1.0} ( 0.0-0% – , 1.0-100% )
beep	beep on/off (beep on – , beep off – )
lcd	lcd X Y WIDTH HEIGHT FFFF
capture	capture ( )
version	Show NanoVNA version ( ) 0.2.1
info	NanoVNA-F info ( ) Model: NanoVNA-F_V2 Frequency: 50k ~ 3GHz Build time: Mar 2 2021 - 09:40:50 CST
SN	NanoVNA-F ID ( ) 5E50583143872750
resolution	LCD resolution ( ) 800,480
LCD_ID	LCD ID ( ) 008000