LoRa/LoRaWAN tutorial 40: N1201SA Vector Impedance Analyser скачать в хорошем качестве

LoRa/LoRaWAN tutorial 40: N1201SA Vector Impedance Analyser

If you like this video and want to support me, go this page for my donation Paypal or crypto addresses:    / mobilefish   This is part 40 of the LoRa/LoRaWAN tutorial. In this tutorial I will demonstrate the use of the N1201SA Vector Impedance Analyser. The antenna used by the gateway or end device plays an important role which should not be under estimated. That is why I am making many videos about this subject. The VSWR and S11 are the two most important antenna parameters which you can measure with an antenna analyser. These parameters determines how well an antenna performs. If you buy devices which includes antennas or you buy the antennas separately, I strongly recommend to measure the antenna parameters. I have noticed that you can not trust the specified antenna parameters. If you build your own antenna, you need to measure the antenna parameters. I have build several antennas for this video series, and more often than not the self build antennas had a VSWR greater than 2. If I did not had an antenna analyser I would not have know this. I bought the N1201SA Vector Impedance Analyser because it had good reviews. There could be better and cheaper antenna analysers out there. Do your own research! The N1201SA is presumably made by a Chinese manufacturer called "Accuracy Agility Instrument". However I could not find any information about this manufacturer. The N1201SA Vector Impedance Analyser measures the following antenna parameters: VSWR, S11, resistance (R), reactance (X) and impedance (Z). The N1201SA series has several models: N1201SA, N1201SAC and N1201SA+. The N1201SA is the basic model which will be demonstrated in this tutorial. The working frequency of this model is between 137.5 MHz and 2700 MHz. The analyser has a built-in high capacity lithium ion battery which can be charged using the micro USB port. The user connects an antenna to the SMA port. The analyser sends a signal to the antenna. The analyser measures how much power is reflected back at various frequencies. As explained in tutorial 33 an antenna with a VSWR smaller than 2 is considered to be a good antenna. This corresponds to an S11 smaller than -9.5 dB, which means less than 11.1% of the power is reflected back. The antenna and the N1201SA are sensitive to its environment: Avoid nearby walls and objects. Avoid nearby electrical equipments (eg: lamps, laptops, mobile phones). Place the analyser on a non conductive table. Do not touch the analyser, antenna or the cable during measurements. Measure the antenna in its final enclosure. Preferably measure the antenna parameters at the location where it is used. To avoid touching the analyser or the antenna during measurement I have build a simple test rig to hold the antenna when measuring the antenna parameters. The antenna is clamped at the type N plug to SMA connector with coaxial cable. The clamps are made of plastic. I use the same test rig when connecting an antenna to my end node. I have build the test rig with random parts found in my toolbox. The N1201SA Vector Impedance Analyser can be calibrated using an OSL calibration kit. The OSL calibration kit need to be purchased separately. OSL stands for Open, Short and Load. N1201SA If the sweep frequency range is large, the measurement value at the specified marker frequency deviates more from the actual value. If you want a more accurate value reduce the sweep frequency range or use the single point mode. In single point mode the measured value is always correct for the specified frequency. In the beginning of this video I have shown you antenna A, B and C. The same antennas were also mentioned in tutorial 33 but they had different VSWRs. What might cause these differences? I have opened these antennas multiple times and have been poking around which might have caused some slight changes. But I have some ideas how to fix/improve antenna B. Check out all my other LoRa/LoRaWAN tutorial videos:    • LoRa/LoRaWAN tutorials   Subscribe to my YouTube channel:    / @mobilefish   The presentation used in this video tutorial can be found at: https://www.mobilefish.com/developer/... #mobilefish #lora #lorawan