Richard Clark wrote in
:

On Sun, 26 Mar 2006 03:48:19 GMT, Dave Oldridge
wrote:

It gets a bit interesting to implement, though, if the antennas are 2000
miles apart!

Hi Dave,

If you mean by interesting, SETI.

Naw, just garden variety radio astronomy.



--
Dave Oldridge+
ICQ 1800667
VA7CZ

Please do not think you are getting something for nothing with an
interferometer. In radio astronomy you have a large number of RF sources
(stars and other interesting objects) transmitting at more or less the same
frequencies. The trick is to select the same source signal for phase
analysis.


Bill W2WO

"Bill Ogden" wrote in message
...
Please do not think you are getting something for nothing with an
interferometer. In radio astronomy you have a large number of RF sources
(stars and other interesting objects) transmitting at more or less the
same
frequencies. The trick is to select the same source signal for phase
analysis.


Bill W2WO



Seems to me there are two things of major concern. 1- getting close to the
target and and 2- phase wrap.

Anyway...
How do they actually distinguish phase in the GHz range between two dishes
across the country/world? I heard they use recordings, but that can't be
right since they'd need pico second timing accuracy...

73, Steve, K9DCi

"Bill Ogden" wrote in
:

Please do not think you are getting something for nothing with an
interferometer. In radio astronomy you have a large number of RF
sources (stars and other interesting objects) transmitting at more or
less the same frequencies. The trick is to select the same source
signal for phase analysis.

Yep...it won't give you any louder signals but it will help you ascertain
exactly where they are coming from.


--
Dave Oldridge+
ICQ 1800667

Richard Clark wrote:
On Fri, 24 Mar 2006 18:48:28 GMT, "W. Watson"
wrote:


There are several cases, which
involve fixed or differences in phase and amplitude he considers, Chap. 4,
sect. 4.2. Can anyone make the idea of phase dependency for an antenna,

SNIP!

73's
Richard Clark, KB7QHC

Thanks, Richard, for this and the one that follows. Well put.

tom
K0TAR