[BC] Re: AM daytimers

[PeterH5322]

>Don't take Dan too seriously (or personally). He is one of those gifted 
>in answering a simple question with five or more tedious paragraphs, 
>certainly no Phil Alexander or Richard Fry or even Peter Haas.

Just like most of us, Dan is right most of the time ;-) .

There are indeed a few cases where the interpretation of the symbols <, 
<=, =, =>, and > are absolute.

One of these is the power of Class Bs (and Class As), with RMS trumping 
power in the case of Class Bs.

I cannot remember a Class D which was authorized with more than 250 
watts, nighttime, irrespective of its antenna system efficiency, but I 
can point to Class Bs with less than, or significantly less than 250 
watts, nights, but which do meet the Class B minimum of 140.82 mV/m at 1 
km, RMS.

Just as an exercise, let's take a hypothetical Class B with a Franklin, 
510 mV/m/kW at 1 km.

What is that power which just produces the Class B minimum?

It's 76.24 watts.

There are several Class Bs with 225 degree radiators, 440 mV/m/kW at 1 km.

Their power is about 101 watts.

These hypothetical 76 and 101 watt stations would be licensable as Class 
Bs as their RMS field would be >= 140.82.

I believe there is at least one Class B which is slightly less than 
140.82, hence not >=, but there was a waiver on account of "first 
service", and extenuating circumstances as to tower siting.

I can't remember the details of that installation, however.