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We are jumping into the realm of wishful thinking with this and I know you know the estimate of “needed” power is subject to more than pulling numbers out of the ether.
First, are we talking about AM or FM? The context of this thread seems to be FM so maybe we should just look at this for a moment.
Yes, hams can communicate reliably with fractions of watts. I did so with 250 mW on 2 meters with a handheld at a distance of 100 miles. My contact was a pilot ham and he was at 10,000 feet altitude. I can work repeaters 20 miles distant with 2 watts but the repeater antennae are on 1000 foot towers. So we know that the conditions are key to performance.
I am going to pull a number out of the ether also and guess that we are talking about 5 to 10 watts ERP to cover a radius of about four miles on the FM broadcast band to allow mobile and table top receivers to function. Sure is fun to speculate isn’t it?
I recall serving on a committee once where we were trying to decide on the size of the letters for a sign. We went back and forth about 2″, 4″, etc. until someone said “Why don’t we start with how far away we want people to be able to read it and work back from that?”. If we are going to pursue LPFM neighborcasting then I suggest we start with range rather than power.
I offer this just for fun and for thought and comment.