[time-nuts] AC Connector On HP 5061B
Lux, James P
james.p.lux at jpl.nasa.gov
Fri Oct 3 18:28:25 EDT 2008
> -----Original Message-----
> From: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] 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?
> Jeffrey K. Okamitsu, PhD, MBA
> > Your absolutely right. The only two places that I can
> think of, off
> > hand, would be televison and RADAR (systems with multiple
> > 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
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