[BC] Re: lpfm question

[Tom]

Whatever it takes to get the 60 dBu contour out to 5.6 km, max.

And the minimum range to the 60 dBu contour is 4.7 km

it's in 73.811

§ 73.811   LPFM power and antenna height requirements.

(a) LP100 stations: (1) Maximum facilities. LP100 stations will be 
authorized to operate with maximum facilities of 100 watts effective 
radiated power (ERP) at 30 meters antenna height above average terrain 
(HAAT). An LP100 station with a HAAT that exceeds 30 meters will not be 
permitted to operate with an ERP greater than that which would result in 
a 60 dBu contour of 5.6 kilometers. In no event will an ERP less than 
one watt be authorized. No facility will be authorized in excess of one 
watt ERP at 450 meters HAAT.

(2) Minimum facilities. LP100 stations may not operate with facilities 
less than 50 watts ERP at 30 meters HAAT or the equivalent necessary to 
produce a 60 dBu contour that extends at least 4.7 kilometers.

a 250' tower is roughly 76.2 m; so reduce the ERP accordingly...

Mike McCarthy wrote:

> I don't believe LPFM's are allowed above 100ft. however.

-- 
Tom Spencer
PG-18-25453 (nee' P1-18-48841)
http://radioxtz.com/