Do any of you know where more complete sets of FCC History Cards are archived? The FCC has some, but to my investigation, only a handful California stations are at the FCC site. It appears to show the parameters of the station before computer records. I happened upon them looking up information on KBRT.
I am really interested in DA parameters from the 1940s and 1950s, when the first big increase in DAs occurred around the time of NARBA. This usually occurred when stations increased day or night power from 500 or 1000 watts nondirectional to 1000 or 5000 watts directional. Also, into the 1960s, when stations increased to 5000 watts daytime and/or nighttime, and often modified existing patterns with shallow nulls and deepened them to allow more power.
I am really interested in DA parameters from the 1940s and 1950s, when the first big increase in DAs occurred around the time of NARBA. This usually occurred when stations increased day or night power from 500 or 1000 watts nondirectional to 1000 or 5000 watts directional. Also, into the 1960s, when stations increased to 5000 watts daytime and/or nighttime, and often modified existing patterns with shallow nulls and deepened them to allow more power.