Yep, I have all those sites Bookmarked already, but I haven't got around to building one yet ... although I have all the parts. Maybe when the season slows down in September.
Thanks for the post, though. I'm sure others can benefit.
Would not a circle inscribed into a 200x200 ft square have a radius of only 100 ft?
In which case, would not pi r^2 = pi x (10,000) = 31,415 ft?
Not trying to be a d*** , just trying to understand.
Hmmm ... right! Sheesh! I never had so much trouble with numbers. I'm gettin' senile, I guess 😉
So, that's a lot closer to the claimed 25,000 sq ft.
Say, how are these guys getting away with these FM band flame-throwers we see on eBay all the time? I thought it's illegal to sell these things in the U.S.
If they are and it's happening anyway, I can almost sympathize with the FCC field agents trying to put a damper on their use. A 30 watt blaster is going to interfere with virtually all local legal Part 15 compliant units, in addition to licensed stations.
What the ...?
Saw this and had to comment so I'm bringing up an old post.
Your calculation is wrong....25,000 square feet is NOT a square mile.
If the broadcastvision can broadcast a radius of 200ft in a circle around it that covers 40,000 square feet!!. The certified BV transmitter is advertised as broadcasting to an area of 25,000 square feet or more. I have and use the more recent version of these and they are also IC certified and work very well.
Mark
Only missed it by about 3 zeros.
A square mile is 27,878,400 square feet. A square quarter of a mile is 1,742,400 square feet.
A square eighth of a mile is 435,600 square feet.
A square sixteenth of a mile is 108,900 square feet.
A square thirty-second of a mile is 27,225 square feet.
So, when advertising 25,000 square feet of coverage you're just a bit under 1/32 of a mile.
That's not much 🙂
TIB
A plane-surface area can be stated in units of square feet, no matter what its geometric shape. That shape does not need to be in the form of a square.
The equation to find the area of a circle is Area = pi(R^2).
For a claimed coverage area of 25,000 square feet, the radius (R) of a circle enclosing that area is √(Area/pi) = 89 feet, approx.
on a good clear frequency to a sensitive car radio or a sensitive all band portable got out about 1200 ft in some directions.
to a deaf reciever it got about 50ft.
good clear frequencies in denver are no longer the case since this last round of translator filings.
Do you have the newer(current model) or the older one?
Or, is it the Waio you have?
The receiver quality, is so important in the range you get, as Part 15 Engineer demonstrated. Just as much as the transmitter power.
Mark
br8000
Pie R Round! Not square.