You only need three separate detections in three separate minutes in each quarter hour to "win" that QH. That is out of 180 possible insertions in a quarter hour.
I'm not sure how those two statements don't contradict each other. On a news-talk there's unlikely to be more than 1 second of silence. Am I wrong? Of course if it's during a baseball game, all bets are off. Maybe I should just accept that it's indistinguishable from magic!
Any pause in audio where the PPM "signal" can't be masked makes that opportunity lost. The encoding is "triggered" on and off by the presence or absence of audio. When people are speaking they have lots of pauses between words and sentences that make coding impossible.
That would be an Audimax, an AGC device. The Volumax is/was a peak limiter. Just compresses, with no expansion.
Oh yes.. thank you for fixing my fuzzy memory. Two of the stations I worked at had an Audimax at the studio feeding the 5 or 10 kc equalized phone line feeding a Volumax at the transmitter. These were AM setups. One station used a 5 kc equalized line because that was the max the phone company could provide.
My first Audimax / Volumax install was for HCRM, an AM at 570 in Quito. We fed the FM STL with the Audimax, and then the Volumax was at the output of the FM receiver at the transmitter. Back then, there were no FM "stations" so, like in much of Latin America, we used 10 watt FM exciters as STLs.
