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Hello Again radioinmyblood.
In a previous message I said I would be back with another idea, and here it is.
While at the moment you have been discussing the desirability of syncing two or more transmitters on the same frequency, this would be a second approach, but ultimately you could employ two different options in your overall setup.
In the glory days of international shortwave the big time players, such as BBC World Service, Deutsche Welle, Swiss Radio and many others, simultaneously sent their program on many frequencies spread from low frequencies to high frequencies, i.e., from 2.5kHz up to 17kHz. The reason was that different frequencies reached different parts of the world as the earth/sun relationship changed all day and night. But that was only part of the plan. When certain frequencies were estimated to become ineffective at certain hours, those frequencies would shut down and new frequencies would start up. There would be an announcement like, “Transmission to North America at 2.5kHz is shutting down and service will continue at 9.5kHz.”
Obviously we are not dealing with such a wide frequency range with only AM or FM, so we will discuss a modified variation of the multiple frequency approach for service over a small geographic area. You can announce on 1690kHz that some areas are better served at 1670kHz, and transmitters on a staggered arrangement could overlap without needing to be synched. It also sounds “important” to talk about your numerous frequencies serving a web-work of locations.
I hope I’ve been both clear and brief in this suggestion.