What USA commercial broadcasting mode uses double sideband - suppressed
carrier ?

--
CL -- I doubt, therefore I might be !

"Caveat Lector" wrote in message
news5S0f.321$i%.10@fed1read07...
What USA commercial broadcasting mode uses double sideband - suppressed
carrier ?



Easy one.. good old analog FM Stereo. Used on the 38KHz stereo subcarrier to
convey the L-R information, which is then beat against a doubled 19KHz pilot
carrier and summed with the L+R main audio to get L and R channels.

Easy for you to say! : )


Easy one.. good old analog FM Stereo. Used on the 38KHz stereo subcarrier to
convey the L-R information, which is then beat against a doubled 19KHz pilot
carrier and summed with the L+R main audio to get L and R channels.

Excellent Brenda -- right on

2nd part of the question - What other information is transmitted?

--
CL -- I doubt, therefore I might be !


"Brenda Ann" wrote in message
...

"Caveat Lector" wrote in message
news5S0f.321$i%.10@fed1read07...
What USA commercial broadcasting mode uses double sideband - suppressed
carrier ?



Easy one.. good old analog FM Stereo. Used on the 38KHz stereo subcarrier
to convey the L-R information, which is then beat against a doubled 19KHz
pilot carrier and summed with the L+R main audio to get L and R channels.

"Caveat Lector" wrote in message
news:z4T0f.329$i%.136@fed1read07...
Excellent Brenda -- right on

2nd part of the question - What other information is transmitted?

stereo reception frequency...18khz maybe


--
CL -- I doubt, therefore I might be !


"Brenda Ann" wrote in message
...

"Caveat Lector" wrote in message
news5S0f.321$i%.10@fed1read07...
What USA commercial broadcasting mode uses double sideband - suppressed
carrier ?



Easy one.. good old analog FM Stereo. Used on the 38KHz stereo subcarrier
to convey the L-R information, which is then beat against a doubled 19KHz
pilot carrier and summed with the L+R main audio to get L and R channels.

Yeah,but that's in South Korea,, is it noo? My oldest sister's son was
in the U.S.Airforce many years ago.He married a South Korean girl over
there.She is very pretty too.
cuhulin

"FDR" wrote in message
...

"Caveat Lector" wrote in message
news:z4T0f.329$i%.136@fed1read07...
Excellent Brenda -- right on

2nd part of the question - What other information is transmitted?

stereo reception frequency...18khz maybe

NOPE


--
CL -- I doubt, therefore I might be !


"Brenda Ann" wrote in message
...

"Caveat Lector" wrote in message
news5S0f.321$i%.10@fed1read07...
What USA commercial broadcasting mode uses double sideband - suppressed
carrier ?



Easy one.. good old analog FM Stereo. Used on the 38KHz stereo
subcarrier to convey the L-R information, which is then beat against a
doubled 19KHz pilot carrier and summed with the L+R main audio to get L
and R channels.

"Caveat Lector" wrote in message
news:z4T0f.329$i%.136@fed1read07...
Excellent Brenda -- right on

2nd part of the question - What other information is transmitted?


That depends on the station. Included in the subcarrier set can be such
things as digital or analog SCA (Subsidiary Communications Authorizations)
or RDS signals. IIRC, these are carried in most cases on 76 and 92 KHz
subcarriers, although there is no steadfast rule for use of subcarrier
frequencies, only convention.

"Brenda Ann" wrote in message
...

"Caveat Lector" wrote in message
news:z4T0f.329$i%.136@fed1read07...
Excellent Brenda -- right on

2nd part of the question - What other information is transmitted?


That depends on the station. Included in the subcarrier set can be such
things as digital or analog SCA (Subsidiary Communications Authorizations)
or RDS signals. IIRC, these are carried in most cases on 76 and 92 KHz
subcarriers, although there is no steadfast rule for use of subcarrier
frequencies, only convention.

Very Good Brenda Ann-- five stars

Yep my wife is in awe of her new car with a Bose system. (She drove the last
car for 17 years & 260,000 Miles)
For some FM stations, the radio panel gives the station call letters and
name (Smooth Jazz), name of the song and artist !!
She exclaimed -- Howd they do that (:-)

She also giggles everytime she uses the buttons on the rear view mirror to
open up the community gates and our garage door. Ah technology

For SCA details - see URL:
http://www.blackcatsystems.com/radio/sca.html

--
CL -- I doubt, therefore I might be !

On Wed, 5 Oct 2005 08:14:49 -0700, "Caveat Lector"
wrote:

What USA commercial broadcasting mode uses double sideband - suppressed
carrier ?
FM stereo transmits the L-R signal at 38Khz with DSB-SC (DSB without
supressed carrier is simply AM).
The signal is recovered by using the 19Khz Pilot carrier on the main
FM transmission to phase lock the 38Khz oscillator for synchronous
detection (If you cannot phase lock the injected carrier, you WILL get
phase distortion, and the stereo signal will sound like cr*p).

That is also why most FM receivers have a deep notch in the audio
section at 19Khz...

Some forms of AM stereo used ISB. L+R on one sideband, L-R on the
other, with sychronous detection with carrier phase locked to the over
air carrier.. The Sync detection that made the Sony ICF2010 so famous
is in fact an AM stereo decoder chip!