NVIS Research Paper

/

The paper 'Radio communication via Near Vertical Incidence Skywave propagation: an overview' by Rosa Ma Alsina-Pagès and Ben A. Witvliet is now available 

Near Vertical Incidence Skywave (NVIS) propagation can be used for radio communication in a large area (200 km radius) without any intermediate human-made infrastructure. It is therefore especially suited for disaster relief communication, communication in developing regions and applications where independence of local infrastructure is desired, such as military applications. 

NVIS communication uses frequencies between approximately 3 and 10 MHz. A comprehensive overview of NVIS research is given, covering propagation, antennas, diversity, modulation and coding. Both the bigger picture and the important details are given, as well as the relation between them.

Download - https://link.springer.com/article/10.1007/s11235-017-0287-2

Motorola Sues Hytera

/

Motorola have submitted a complaint to the U.S. District Court for the Northern District of Illinois against Hytera Communications Corporation Limited claiming that Hytera’s two-way radios, base stations, repeaters and dispatch systems, as well as its related commercialization and sales activities, are infringing patents owned by Motorola Solutions and utilizing stolen Motorola Solutions trade secrets.

Motorola Solutions believes that Hytera is intentionally infringing its intellectual property and misappropriating its trade secrets, which has enabled Hytera to compete unfairly by bypassing investment in innovation.

Recently, three Motorola engineers resigned from the company and joined Hytera. It is claimed that the ex-employees had key roles in developing products for their new employer that infringed intellectual property using in excess of 7,000 highly confidential files covering all aspects of the Motorola business.

Motorola Press Release - https://newsroom.motorolasolutions.com/news/motorola-solutions-files-patent-infringement-and-trade-secret-misappropriation-complaints-against-hytera-communications.htm

New Ham Radio Rules in Uruguay

/

From February 2014, new amateur radio regulations came into force in Uruguay, which have been updated in accordance with recent international regulations and developments.

Changes include

  • The bands and the sub-bands are adopted according to the recently updated IARU R2 band plan.
  • New bands are authorised
    • 60m from 472 to 479kHz
    • 60m from 5,351.5 to 5,366.5
    • 6mm from 47 to 47.2 GHz
    • 4mm from 77.5 to 78 GHz
  • Frequency allocation is extended on 80m from 3,500 to 4,000 kHz and on 160m from 1,800 to 2,000 kHz
  • New amateur radio bands are allocated in SHF (microwaves) and reserved them for future amateur radio satellites.
  • It creates the category "BEGINNER" (novices) giving new amateurs the possibility of easy access.
  • Exam questionnaires have been updated, eliminating technical questions (circuits) and replacing them with current issues and operating procedures.
  • It creates a training program for new radio amateurs with mandatory operational practice on 80, 40, 10 and 2 meters.
  • CV and CW prefixes are now available for permanent licenses.
  • The maximum emission power for the “SUPERIOR” category is set at 1500W PEP.
  • The possibility of adding future digital and digital voice communications systems is left open.
  • It establishes the procedures for foreigners to apply and renew their licenses.
  • Reciprocal permits are maintained for non-resident foreign amateur radio.

The official text of the new Regulation (in Spanish) - https://goo.gl/CqYYZs