Two new antennas from Comrod

The Norway based Comrod A/S has launched two new antennas: The Multi-Band Cellular Phone Antenna and the Multifunction Antenna System.
The Multifunction Antenna System MAS1 allows simultaneous transmitting and multireceiving through a single cable and antenna at the same time.
The MAS1 just builds 140 mm onto a standard VHF-antenna with 43 mm diameter. A regular Comrod VHF or Comrod combined VHF/cellular antenna is mounted on a wide-band preamplifier and all frequency bands are combined into one output port and only one antenna cable is needed.
At the other end of the cable, a filter unit is connected. This unit divides the signals into its desired connection port. The power to the preamplifier is fed from the filter unit through the coaxial cable so no power cable is required.
The new MAS1 can receive Navtex, AM/FM Radio, Weatherfax, SSB, DGPS and VHF as well as transmit on VHF. Also Cellular GSM can be received and transmitted.
The AC15-B1 Antenna is designed for nearly all US and European cellular frequencies, including GSM and covers 825–895 MHz, 880–960 MHz, 1,710–1,880 MHz and 1,850–1,990 MHz.
It’s no longer necessary to change the antenna when alternating between European and American mobile phone frequencies. The antenna has a compact design with a height of just 250 mm and does not need any ground plane and can be installed on all kinds of ships. The gain of 2dB means it gives a better transmission quality compared to a mobile phone’s standard antenna.
Both the antennas have all elements completely enclosed in polyurethane foam within a fibre glass tube.
For more information please contact Enok Oedegaard, tel +47-51-74 05 00, fax +47-51-74 05 01, e-mail sales@comrod.com, www.comrod.com.

Membrane Bioreactor Technology

Hamworthy KSE has been contracted to supply BMR (Membrane Bioreractor) waste water treatment systems to the Ministry of Defence in Great Britain for the first six Type 45 destroyers to be constructed at BAe Marine at Scotstoun and Vosper Thornycroft at Porchester. The first system together with collecting equipment will be delivered in June 2003.
The company will supply two MBR systems per vessel, each incorporating six membrane modules. The plant will be able to handle approximately 2 to 2.5 cubic meters of black water and 50 to 55 cubic meters of gray water per day with a 100 per cent standby capacity.
The MBR system features a two-stage biological digester, with the membrane module, containing multiple membranes, coupled into a second-stage bioreactor tank. The integration provides a large membrane surface area which maintains high cross flow allowing efficient volumetric throughput. It also avoids separate enclosures, transfer pipes and pumps to yield a compact solution in comparison with split systems.
In addition, reduced tank size is achieved by halving the re-tention time for conventional biological digestion.A further advantage is that it can be incorporated in existing arrangements, while the ship is still in service.
For more information, please contact Graham Lockyer, tel +44-(0)1202-66 26 04, fax +44-(0)1202-66 26 36.

Compact NOx Monitoring System

The Sweden based company Opsis AB has developed a Compact Chemiluminescent NOx Funnel Gas Analyser. The user-friendly and easy installed equipment consists of an analyser box, a dilution probe including a pump and five meters sample line. The analyser is a combination of a dilution probe and a chemiluminescent detector.
The chemiluminescent NO analyser measures the total contents of NO in the exhaust gases on a wet basis without any interferences from other components. The chemiluminescent analyser only requires connection of power, oil free compressed air and sufficient vacuum.
The exhaust gases are first prediluted in the dilution probe to a level where quenching of signal is avoided and wear of the analyser and contamination of the reaction cell are minimized. In the reaction cell the gas is mixed with ozone which gives us NO2+light.
The intensity of the emitted light is proportional to the concentration of NO. A software filter allows fast response to rapidly changing concentration levels while providing a quiet signal for steady state conditions.
The analyser continuously does a self-check on key parameters and a warning is given when finding any out-of tolerance parameters.
For more information please contact Ulf Gustavsson, tel +46-46-72 25 65, fax +46-46-72 25 01, e-mail ulf.gustavsson@opsis.se, www.opsis.se.

Back to SSG 2, 24 January