Making frequency-hopping radios practical
22 May, 2013 by Larry Hardesty, MITHardware breakthrough could see wireless devices that identify and exploit unused frequencies.
Antenna system monitoring
20 February, 2013The measurement, monitoring and reporting of the performance of wireless network infrastructure has come a long way over past years. Many modern base station repeaters provide integrated measurement capabilities, but the use of combining and/or isolators in the RF path from the base station transmitter output to the antenna isolates the repeaters from most problems that may occur within the combiner and antenna subsystems.
The challenge of the backyard antenna
21 January, 2013 by Mike Smyth, specialist technical writerBefore the days of separate antenna tuners, Mike Smyth and his mates created their own successful homemade long antenna in the backyard.
IME develops silicon-based integrative antenna technology
06 September, 2012A*STAR’s IME has developed a compact, silicon-based, cavity-backed slot antenna that operates at 135 GHz.
Gore cable-based antenna range
09 August, 2012Cable-based antennas or leaky feeders have been introduced to improve signal propagation without increasing the amount of hardware required on an aircraft.
Understanding the hidden power rating of antennas
14 March, 2012There are a number of antenna specifications that determine the selection of an appropriate antenna for a particular application. These may include bandwidth, directivity, gain, pattern stability and the PIM rating. Another important antenna rating, becoming more relevant in recent times, is the PIP rating, summarised in this article.
400 MHz changes benefit UHF CB users
20 July, 2011Owners of UHF CB radios will now have access to more channels in the 400 MHz band, following a three-year ACMA review and release of its time frames and plans to restructure the band.
APCO supports ESOs’ 800 MHz
21 June, 2011APCO Australasia supports the latest proposal for ESOs to be allocated spectrum in the 800 MHz band to build their own national mobile broadband network.
Understanding cable and antenna analysis
31 August, 2010 by AnritsuThe cable and antenna system plays a crucial role of the overall performance of a base sta¬tion system. This white paper covers the funda¬mentals of the key measurements of cable and antenna analysis: return loss, cable loss, and distance-to-fault (DTF).
Making better use of the spectrum
26 May, 2010A digital radio system that is designed to make more efficient use of the spectrum will use a 6.25 kHz bandwidth and have increased range.
Major changes planned for 400 MHz band
01 December, 2009The identification of a harmonised government band to facilitate interoperability between government agencies, particularly the police, security and emergency services, was one of the major proposals contained in a consultation paper presented at the RadComms conference in Sydney in April.
Radio map may tune in wave of innovation
30 June, 2009In one of the most detailed radiofrequency mapping projects ever carried out in Britain, one technology innovator is undertaking the first Britain-wide radio spectrum monitoring for Ofcom, the independent regulator and competition authority for British communications industries with responsibilities across TV, radio, telecoms and wireless services.
Averting spectrum saturation
26 May, 2009Mobile users want better video calls, streaming television and faster downloads, placing more demands on the limited radio spectrum available to operators. Could handsets that intelligently sense their radio environment and opportunistically grab free bandwidth be a solution?
Cognitive radio allows spectrum sharing
01 May, 2009In the event of a disaster, the emergency services have to be able to trust communication networks. But what happens if the network is overloaded or even off the air as a result of the disaster?
Spectrum licensing review
27 April, 2009The Australian Communications and Media Authority has released a discussion paper as part of a review of the technical frameworks that apply to spectrum licences.
