"TritonVA" wrote in message
...

(...snip...)

Not to launch another AM Stereo flame war but...

I've noticed that WPGC (1580 AM) runs with C-Quam during their daytime
50Kw authorization, but then drops the C-Quam when they lower power (to
270 watts!) and change their pattern at night.

I live within 10 miles of their plant (but still inside the pattern), so
I'm not entire certain that they actually turn off the C-Quam or if the
signal is merely so poor that C-quam just isn't possible.

What would be the advantages of disabling C-Quam during protected hours?


Just a guess, but they may use 2 different transmitters...one for days, and
one for nights, given the large discrepancy between operating power levels.
Heck, the control circuits of the high-power 50 kW xmtr probably use more
than 270 watts of AC power just running in standby !! In any case, it may
be as simple as the low-power transmitter not being equipped with a C-QUAM
exciter (or it not being in working condition) ..... and judged not to be
worth the $$ it would take to repair/replace/install in the first place.