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hi, chuck,  you might get more responses if you change the title line.  We have whisper dishes that are probably 80 feet apart, and about 6 ft diameter.  but I don't have any general rules of thumb.

eric siegel

On Jan 29, 2013, at 5:04 PM, Chuck Howarth <[log in to unmask]> wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
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> Hi, guys.  Does anyone know if there is an intrinsic limit on how far apart whisper dishes can be?  Would they work at a separation of 100 feet?  And if they are farther apart, does that mean that the dishes need to be bigger?  Many thanks, 
> 
> Chuck Howarth, Vice President
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