Ian, Other than building a 50 ohm parallel wire transmission line and measuring the voltage standing waves , I can't see a solution to making the measurements with what you have.
However, I think that most people who calculate uncertainty budgets will look up the VSWR of the items of test equipment in the manuals. I expect that you will find the input VSWR of the receiver in the manual. We get the VSWR of the antenna by consulting the calibration certificate. If you wanted to post the details of the antennas you have, somebody may be able to supply figures. The mismatch between 50ohm cables is usually ingnored as negligable, so all you need is receiver and antenna VSWR. Hope this helps, ---------------------------------------------- Dr Luke Turnbull Principal EMC Engineer TRW Conekt Statford Road Solihull B90 4GW Tel: +44 (0)121.627.3966 email: [email protected] ---------------------------------------------- >>> "Gordon,Ian" <[email protected]> 09/26/02 11:01am >>> Everybody I need to assess the uncertainty of radiated emission and immunity measurements and thus need to measure the mismatch between components in the systems. The frequency range of interest is 30MHz-1GHz) Is there a way in which I can measure the VSWR of a cable-antenna-receiver/amplifier combination without having to purchase a directional coupler or network analyser? The equipment I have at my disposal is: two power amplifiers (150kHz-30MHz & 80MHz-1GHz), a spectrum analyser with tracking generator (9kHz-2.6GHz), signal generator (150kHz-1GHz), RF power meter (9kHz-1GHz) and a receiver (9kHz-2.6GHz). Any suggestions would be appreciated. Thanks Ian Gordon _____________________________________________________________________ This e-mail has been scanned for viruses by the WorldCom Internet Managed Scanning Service - powered by MessageLabs. For further information visit http://www.worldcom.com ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
