[BC] A Class B AM that runs less than 250W at night

[Phil Alexander]

On 23 Feb 2006 at 19:42, Dan Strassberg wrote:

> WLIE 540 Islip NY is one example of a Class B AM that runs less than 250W at
> night yet is (currently) a Class B because its night-pattern RMS of 156.2
> mV/m @ 1 km using 220W into two towers is well over the 140.85 mV/m @ 1 km
> limit for Class Ds. 

This serves to illustrate the point made in this thread by Robert previously.
It is entirely possible to have a Class B nighttime authorization with less
than 250 W provided the f/s is adequate.

However, a Class D nighttime MUST operate with less than 250 W and must not
meet the f/s requirement for a Class B license. To be sure, it is a fine
point, but you cannot have a 250 W Class D nighttime regardless of how low
the f/s. OTOH, by meeting the Class B f/s you can have a Class B nighttime
license for a power less than 250 W.

Note that Class D nighttime authorizations are NOT licenses and are NOT
protected per se, although any station on the channel desiring an upgrade
to Class B nite must show the upgrade does not unduly prevent other
upgrades. Therefore, it is not exactly correct to say there is a complete
absence of protection although it is quite tenuous.


Phil Alexander, CSRE, AMD
Broadcast Engineering Services and Technology 
(a Div. of Advanced Parts Corporation) 
Ph. (317) 335-2065   FAX (317) 335-9037





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