Total posts : 45366
Here is what we do now based on Tim’s tests:
1. Out of the box the Whole House FM Transmitter 3.0 puts out an RF Power of 2 mW into a rubber duck and goes around 300 Ft to a portable M Radio. To double this range you would have to square root the 2mW (which is 4mW) this will get you 600 Ft. Now for 900 fT you need to squuare root the 4mW which is now 16 mW. So for 1,200 Ft to a portable Radio you need 32 mW to do this into a rubber duck antenna similar to the original antenna on the Whole House FM Transmitter 3.0. If the SainSonic was truly putting out 500 mW and all the energy was not wasted on spurs and harmonics at 500 mW you would have to keep square rooting the amounts of power till you get to 500 mW and that will tell you what you should expect from 500 mW. So 1.500 Ft is 32 mW, 1,800 Ft is 64 mW and 1,100 Ft is 128 mW. So if you want over 1,000 Ft it will take you 128 mW into a rubber duck. Asking for 100 mW on FM and maybe 87.9 Mhz for areas with no channel 6 should be allowed. So knowing about the 2mW output for the Whole House FM Transmitter 3.0 was a key to asking for mW. 100 mW would get you some nice range if that transmitter was clean and its energy went where it was supposed to go.