You could hire a suitable directional coupler for less than £100 for a week. Alternatively have a look at the used market.
Chris Colgan Compliance Engineer TAG McLaren Audio Ltd The Summit, Latham Road Huntingdon, Cambs, PE29 6ZU *Tel: +44 (0)1480 415 627 *Fax: +44 (0)1480 52159 * Mailto:[email protected] * http://www.tagmclaren.com > -----Original Message----- > From: [email protected] [SMTP:[email protected]] > Sent: Thursday, September 26, 2002 3:25 PM > To: [email protected] > Subject: Re: MEASURING VSWR WITHOUT A DIRECTIONAL COUPLER > > > > > If you want to make measurements, you will need to invest in some sort of > equipment. To measure VSWR, you need some sort of equipment that can > either > measure forward and reverse waves, measure voltage along a transmission > line, or > can vary phase and possibly magnitude of impedance. The first is a > directional > coupler or network analyzer, the second would be a slotted line or open > wire > transmission line, and the third would be things like line stretchers or a > large > selection of slightly different length transmission lines, and various > sorts of > "tuners" (LC or transmission line tuners such as the double stub variety). > > A directional coupler is certainly the easiest to use. The tuner option is > often > used when measuring the output impedance of non-linear devices (e.g., > class C > amplifiers). Open transmission lines are not often used for measurements, > but > are excellent tools to demonstrate standing waves. > > Don Borowski > Schweitzer Engineering Labs > Pullman, WA > > > > > > "Gordon,Ian" <[email protected]> on 09/26/2002 03:01:02 AM > > Please respond to "Gordon,Ian" <[email protected]> > > To: "'IEEE EMC & SAFETY PSTC'" <[email protected]> > cc: (bcc: Don Borowski/SEL) > Subject: MEASURING VSWR WITHOUT A DIRECTIONAL COUPLER > > > > > > 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 e-mail may contain SEL confidential information. The opinions > expressed > are not necessarily those of SEL. Any unauthorized disclosure, > distribution or > other use is prohibited. If you received this e-mail in error, please > notify > the sender, permanently delete it, and destroy any printout. Thank you. > > > > ------------------------------------------- > 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" ************************************************************** Please visit us at www.tagmclaren.com ************************************************************** The contents of this E-mail are confidential and for the exclusive use of the intended recipient. If you receive this E-mail in error, please delete it from your system immediately and notify us either by E-mail, telephone or fax. You should not copy, forward or otherwise disclose the content of the E-mail. Important Note: Any typographical, clerical or other error in this communication is subject to correction without any liability on the part of TAG McLaren Audio Limited. Any orders placed shall be subject to acceptance by TAG McLaren Audio Limited on its standard terms and conditions of sale which shall govern the contract for the sale and purchase of the products ordered to the exclusion of any other terms and conditions. TAG McLaren Audio Ltd The Summit, 11 Latham Road Huntingdon, Cambs, PE29 6ZU Telephone : 01480 415600 (+44 1480 415600) Facsimile : 01480 52159 (+44 1480 52159) ************************************************************** Please visit us at www.tagmclaren.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"
