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Summary of Contents for LAPLACE INSTRUMENTS RF200
- Page 1 RF200 Antenna User Manual Version 3.0 January 2004 LAPLACE INSTRUMENTS LTD 3B, Middlebrook Way CROMER Norfolk NR27 9JR Tel: 012 63 51 51 60 Fax: 012 63 51 25 32...
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Page 2: Table Of Contents
RF200/500 user manual Index 1.0 Introduction Page 3 Background 2.0 RF200 broadband antenna Page 4 Assembly Page 4 In use Page 6 Antenna Factor Page 7 3.0 Ground Plane Page 8 4.0 Test site calibration Page 9... -
Page 3: Introduction
‘antenna factor’ curve. This is a plot of sensitivity vs frequency over the full working range of the antenna. The RF200 has a working range of 30MHz to 1GHz and thus matches the requirements of the EN standards. -
Page 4: Rf200 Broadband Antenna
RF200/500 user manual 2.0 RF200 Broadband antenna The broadband antenna will allow the user to detect and measure radiation over the frequency range 30MHz to 1GHz. This is shipped in a ‘knocked-down’ form to ease packaging and to minimise the potential for damage in transit. -
Page 5: Assembly
RF200/500 user manual Fig 1 RF200 Assembly RF200 Stand assembly... -
Page 6: In Use
RF200/500 user manual Fig 2 RF200 stand This is supplied as a central vertical support fitted with a leg attachment moulding and three legs. The legs are a push fit into the leg attachment moulding. The vertical support has a friction slide fit in the leg attachment moulding so that the antenna can be adjusted in height over the full length of the vertical support. -
Page 7: Antenna Factor
A plot of sensitivity vs frequency is called the Antenna Factor. The SA1000 Windows software has the antenna factor for the RF200 broadband antenna ready installed. Selecting this item in the INPUT menu automatically applies the appropriate conversion to read out in absolute field strength. -
Page 8: Ground Plane
RF200/500 user manual Antenna Factor tabular data Freq(MHz) A.F. (dB/m) Freq(MHz) A.F. (dB/m) Freq(MHz) A.F. (dB/m) 13.5 1000 14.5 3.0 Ground plane In general, any UUT will emit radiation in all directions. Some of this will impinge on the ground which will partially reflect this radiation. -
Page 9: Test Site Calibration
RF200/500 user manual To overcome this effect, the standards call for the antenna to be mounted on a mast so that it can be varied in height over a range of 1 to 4 metres. For each frequency there will be a height at which the two signals are in phase and additive. This is the height at which that frequency is measured. - Page 10 RF200/500 user manual If using a an open field test site, this should also be calibrated. The ground plane reflection alone can have a significant effect on the test results. To calibrate a site, a known source should be used. Laplace can supply a calibrated source, complete with calibration curves, which is specifically designed for the calibration of sites and antennas.
- Page 11 RF200/500 user manual LAPLACE INSTRUMENTS LTD 3B, Middlebrook Way Cromer Norfolk NR27 9JR Tel: +44 (0) 12 63 51 51 60 Fax: +44 (0) 12 63 51 25 32 tech@laplace.co.uk Web: www.laplaceinstruments.com...
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