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[quote:8263ff549a=”12vman”]Say if I had (4) Part-15 xmtrs that were close togather over the same ground system, all of the reference osc. were from a common source. (all in sync) Would they enhance each other?[/quote:8263ff549a]
Yes, because this is the electrical equivalent of applying 4X the legal Part 15 power to a large cross-section structure acting as a single radiator. So the system would not be Part 15 compliant.
Increasing radiated power by 4X only doubles field strength (other conditions equal). Probably you could get more of an improvement than that just by installing a very good radial ground system to use with a single Part 15 tx and radiator.