Chris Albertson wrote:
On Wed, Mar 16, 2011 at 11:00 PM, jimlux<[email protected]> wrote:
Could you make the measurement in, say, 48 hours.. A portable setup might be
reasonable with a 10-20km baseline.
Before you can even think about building a long baseline radio
receiver the first goal is to be able to detect a quasar with just one
receiver from a suburban back yard. Then you can think about
building two receivers. From my reading most amateur targets are
things like Cassiopeia A or the Crab Nebula.
Synchronizing the several receivers that are spread aroud is not
really even required.
You've obviously never tried doing this or you wouldn't make such claims.
Such solution space searches are impractical even today.
Many years ago astronomers would mail magnetic
tapes and the data would be combined days after the observations
After all if both receivers are looking at the same distant
transmitters you should be able search for a solution. But of course
having good time tags reduces the search space.
They still used a hydrogen maser at each VLBI site.
Today they tend to mail hard drives instead.
A 10-12m diameter dish is probably close to the minimum feasible aperture.
A 4m dish can be made to work in conjunction with a mauch larger dish
(eg 30m).
Bruce
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