Coverage Issues with Phase-locked Part 15 AM Systems
Recently I have written here about the coverage pattern issues when using two Part 15 AM systems on the same frequency -- even when their carriers are phase-locked (synced).
The link below shows this in graphic form for two phase-locked systems at a physical separation of one mile.
Here's another version with an antenna separation of 500 feet.
These patterns are valid for receiving locations about the same distance from each transmit antenna. The patterns would be different for receivers much closer to one transmit antenna than the other. But it shows how coverage can vary in this situation.
Even though the transmitters are phase-locked, the systems don't reinforce each other in every direction -- in some directions they cancel each other.
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