Re: [IRCA] TAs and TPs--Carrier without audio

[Charles A Taylor <MWDXer@xxxxxxx>]

At 02:59 AM 3/13/2007 -0400, you wrote:
>Carriers without audio on TAs and TPs is a result of
>under modulation of the audio part of the signal,yes
>or no?

Bill,

I was told some twenty years ago that European broadcasters
hold their modulation to about 80% peaks, and don't use the
"supermodulation" techniques used here in NA.

Consequently, their modulation density is much lower than
for Region II stations.

I observed that the Asians generally modulate to 100%, but
I don't think they "supermodulate" (peaks to 125% of carrier)
as Region II stations do.

If Saudi Arabia used supermodulation techniques on their
2-megawatt 1521-kHz rig, we'd sure know it quick. They
must hold their peaks down to 75% or so.

>73,

Charles



        -----
Charles A Taylor, WD4INP
Greenville, North Carolina 


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