[BC] Overcrowding & noise floor on AM

[PeterH5322]

>For many years, I would lunch with a fellow, in his 90s, who started in
>broadcasting in the 1930s.  (He retired in the mid-1990s)  He told me about
>working at a 100 W station that was on a frequency in the 1300s on the dial.
>(I don't remember the exact frequency)  They would often sign on after
>midnight for external frequency measurements.  They got QSLs from as far
>away as Australia.

0.1 kW was a legit power for Class IV stations (1230, 1230, 1340, 1400, 
1450 and 1490, after 1941; 1200, 1210, 1310, 1420 and 1500 before 1941), 
and for the  two "Class IV stations operating on a Class III frequency".

In the 1960s, 0.1 kW was banished for all Class IVs except those on Class 
III requencies, and all Class IVs moved to 0.25 kW nights, and 1 kW days, 
using a DA days, if required.

In the extended L.A. area, we had two Class IVs which had DA-Ds ... 1400 
in Santa Paula, and 1450 in Ventura.

It was 1340 in Mojave which ran 0.1 kW into the 1960s. Probably 0.25 kW 
days/0.1 kW nights.