When calculating the high-frequency technique with the use of mirror reflecting systems (parabolic mirrors), there is always the problem of searching for the phase center of the antenna (FCA), since proper operation of the mirror is possible only if the focus is on an antenna (called the feed, feeder, feedhorn) which has a phase wave front in the form of a sphere, and the center of this sphere is in the focus of the mirror. With any deviations, both the shape of the phase front from the sphere, and the displacement of the FCA from the focus of the mirror - the efficiency of the mirror system falls...

Several days ago on Habré Article 3r3217 appeared. how Starlink - satellite Internet from SpaceX - will affect the work of banks and other organizations. Today we decided to continue this topic and talk about how the "star network" is planning to deploy.
 
 
3r311. nasa.gov /PD [/i] 3r3147.
 
 

A few words about Starlink

 
Starlink is a network of near-earth satellites, which is developed by Ilona Mask SpaceX. The goal of the project is to create a high-performance communication channel that will provide an Internet connection anywhere in the world.
 
 
Starlink work began in 2015...

In 3r3147. previous article 3r3148. We reviewed the integration of 3CX v15.5 with a typical configuration of 1C Trade Management, edition 11 (???.167) for Russia. However, some experts in the comments expressed concern that disabling the compatibility mode of the 1C platform with the current version of the Trade management configuration could cause various problems for users. Although we did not receive any information about any problems, we prepared a second instruction describing the combination of configurations. 3r3145.  3r3154. 3r3145.  3r3154. So, at the moment we offer two ways to integrate ...

In early October, the company Xilinx introduced r3r3222. The new Versal chip, built on programmable valve arrays (3r3-36. FPGA 3r3-33222.). The logic of such a device can be modified at any time during use. It is expected that the chip will accelerate the work of AI systems and will find application in 5G networks. The processor release is scheduled for late 2019.
 3r33232.
 3r33232. Next, we talk about the device and how it will help the networks of the new generation.
 3r33232.
 3r33232.


 3r33232.
3r3189...

 3r33434. 3r3-31. I continue a small series of articles devoted to the creation of a “smart home” and step-by-step instructions for self-installation /configuration. 3r33411.  3r33434. But now it will be mainly about Freeswitch and IP telephony. 3r33411.  3r33434. In August, the developer of the open VoIP IP telephony platform FreeSWITCH, ClueCon, published a public release of the new software version - 1.8. (??? has already been released). 3r33411.  3r33434. In connection with the release of this version of the Freesfitch 1.8 IP telephony platform, there was a decision to install it on Raspberry ...

Last year, a very interesting presentation was presented at the conference “USENIX Symposium on Networked Systems Design and Implementation”. How to turn a T-shirt or billboard into an FM radio station. The presentation author explains how to “fit” digital data and arbitrary audio tracks onto an FM signal already flying over the air. Through the effect of backscattering radio waves. The presentation seemed so interesting to me that I could not refrain from preparing a brief retelling.
 
What is the practical value of such "FM-jerking"? Are they generally real, or is it from science fiction? And ...

 
3r3-31. In early October, the Wi-Fi Alliance announced a new version of the standard Wi-Fi - Wi-Fi 6. Its release is scheduled for the end of 2019. The developers changed the naming approach - they replaced the usual ???ax-type constructions with single digits. We understand what else is new. 3r3179.  
3r3179.  
3r3190. 3r3179.  
3r3119. 3r3152. /Wikimedia / yonolatengo / CC 3r3194.
3r3179.  
3r3179.  

Why change the name

3r3179.  
By According to 3r3190. developers of the standard, the new approach ...[/h]

In the literature described approximate formulas for calculating additional heat losses in uncoordinated transmission lines (cables, waveguides) due to standing waves. The limitation of such formulas is that the own losses of the matched cable should be up to 2 dB. Today, high-loss cables are increasingly used for microwave frequencies above 1 GHz. Broadband antennas often have a CWS 1. To find a compromise between the length of the line (for example, the antenna's suspension height), its cost, to estimate losses in a deliberately mismatched line (for example, 75 Ohm cable in 50 Ohm systems)...

 3r-33199. 3r3-31. Today we have an unusual material - this is a translation of an article about illegal automatic dialing in the USA. For centuries, there have been people who used technology not for good, but to fraudulently cash in on gullible citizens. Modern telecommunications are no exception, spam or outright "divorces" can overtake us by SMS, by mail, by phone. With phones it has become even more fun, because today there are automatic calls (hereinafter - robozvonki). Invented as a legitimate and transparent way to inform people and make additional sales, they are very fond of scammers; ...

Virtualization technologies are coming to the network of mobile operators. We started appear Services such as Mobile Network as a Service (MNaaS) and acquire the popularity of electronic SIM. Let's talk about the potential benefits of these technologies for operators and customers and the complexities of their implementation.
 
 


 
/ PxHere /PD
 
 

Mobile network as a service

 
The technology "mobile network as a service" (MNaaS ...[/h]