> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Jeffrey Okamitsu > Sent: Friday, October 03, 2008 2:46 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] AC Connector On HP 5061B > > For an interferometric application, isn't it sufficient to > maintain constant phase difference? > > Jeff > > Jeffrey K. Okamitsu, PhD, MBA > +1-609-638-5402 > > > > > Your absolutely right. The only two places that I can > think of, off > > hand, would be televison and RADAR (systems with multiple > terminals). > > > > Bill....WB6BNQ > > > > > > Interferometers are another. >
Jeff is right, BUT, keeping constant phase difference without equal length cables can be challenging. Consider a system I worked on which used phase difference between 7 GHz signals received between two antennas about a meter apart to steer a return beam at 32GHz back the same direction. And, it has to do this while subject to temperature variations from -40 to +80C. James Lux, P.E. Task Manager, SOMD Software Defined Radios Flight Communications Systems Section Jet Propulsion Laboratory 4800 Oak Grove Drive, Mail Stop 161-213 Pasadena, CA, 91109 +1(818)354-2075 phone +1(818)393-6875 fax _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.