(Bob Radil) wrote in message ...
... and creates significant adjacent channel interference
problems. For the latter reason, its use is forbidden at night.

And likewise, it should be forbidden for daytime use also since important
componants of the signal are outside of the defined bandwidth. If all stations
go IBOC then the mutual interferance will severely reduce the coverage areas of
all stations, even the 50KWs.

IBOC = I.nterfering B.adly O.ff C.hannel

Bob Radil
A ?subject=NewsgroupRes ponse" E-Mail /A

I was going through your recent posts when I came across this one on
this different NG (which i've actually been to before)..what's IBOC?

BTW just finsihed hearing the Three Dog Night promo from the 60s show
website that you posted over in rec.music(the 70s ng)!Excellent!

Yeah, but Riverside is in KTNQ's null - where their day pattern has the
equivalent of about 6kW, NOT 50kW. The KTNQ day pattern runs 6kW or less
over most of the ESE quadrant. They have far less toward Riverside at night.
And Riverside is in the max of 1050's day pattern.

Presumably the 1020 IBOC pattern is proportional to the main signal's
pattern.


I wouldn't presume that. Most ATUs and phasors are designed for the carrier
frequency. The fact that a transmitter may also transmit audio sidebands is a
secondary issue. IBOC splatter was certainly not taken into consideration in
the design of nearly, if not all, of the phasors in use today.

Bob Radil
A ?subject=NewsgroupRes ponse" E-Mail /A

I was going through your recent posts when I came across this one on
this different NG (which i've actually been to before)..what's IBOC?

IBOC is the system by which digital audio can be transmitted over a standard
analog radio channel. At least in theory. In practice, it splatters over
adjacent channels.


BTW just finsihed hearing the Three Dog Night promo from the 60s show
website that you posted over in rec.music(the 70s ng)!Excellent!

The stereo single version? Thanks!

http://66.159.186.150/jukebox/JoyToTheWorld(stereosingle)-ThreeDogNight.wma

http://members.aol.com/WNHU60s70s/

Bob Radil
A ?subject=NewsgroupRes ponse" E-Mail /A

I was going through your recent posts when I came across this one on
this different NG (which i've actually been to before)..what's IBOC?

BTW just finsihed hearing the Three Dog Night promo from the 60s show
website that you posted over in rec.music(the 70s ng)!Excellent!


Thank you!

IBOC is the system of digital audio broadcasting on a standard analog audio
channel. Needless to say, it doesn't fit. It's only going to get worse.

"Joy To The World" single version in stereo:
http://66.159.186.150/jukebox/JoyToTheWorld(stereosingle)-ThreeDogNight.wma


Bob Radil
A ?subject=NewsgroupRes ponse" E-Mail /A

In article , Bob Radil wrote:

I was going through your recent posts when I came across this one on
this different NG (which i've actually been to before)..what's IBOC?

IBOC is the system by which digital audio can be transmitted over a standard
analog radio channel. At least in theory. In practice, it splatters over
adjacent channels.

It stands for IN BAND ON CHANNEL, although really it should be called
IN BAND BETWEEN CHANNELS.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

"Bob Radil" wrote in message
...

Yeah, but Riverside is in KTNQ's null - where their day pattern has the
equivalent of about 6kW, NOT 50kW. The KTNQ day pattern runs 6kW or less
over most of the ESE quadrant. They have far less toward Riverside at
night.
And Riverside is in the max of 1050's day pattern.

Presumably the 1020 IBOC pattern is proportional to the main signal's
pattern.


I wouldn't presume that. Most ATUs and phasors are designed for the
carrier
frequency. The fact that a transmitter may also transmit audio sidebands
is a
secondary issue. IBOC splatter was certainly not taken into consideration
in
the design of nearly, if not all, of the phasors in use today.

The KTNQ phaser and ATUs were carefully, and at great cost, redesigned for
IBOC.

Your observation is correct for most stations, however.

In article , Bob Radil wrote:

I wouldn't presume that. Most ATUs and phasors are designed for the carrier
frequency. The fact that a transmitter may also transmit audio sidebands is a
secondary issue.

This is unfortunately true, and it's also one of the more important sources
of lousy sound for AM broadcasters. Low group delay across the antenna system
really _is_ important for good clean analogue audio.

IBOC splatter was certainly not taken into consideration in
the design of nearly, if not all, of the phasors in use today.

IBOC now requires low group delay across an even wider frequency range. My
hope personally is that stations will be forced to upgrade their phasing
networks and antenna systems in order to implement IBOC-AM, which will then
fail, leaving them with wider band antenna systems that result in higher
analogue audio quality.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Unfortunately those improved wider band antenna systems will only be passing
analog audio that has
been hard band limited to frequencies below 5 kHz to be compatible with the
IBOC data carriers.

"Scott Dorsey" wrote in message
...
In article , Bob Radil
wrote:

I wouldn't presume that. Most ATUs and phasors are designed for the
carrier
frequency. The fact that a transmitter may also transmit audio sidebands
is a
secondary issue.

This is unfortunately true, and it's also one of the more important
sources
of lousy sound for AM broadcasters. Low group delay across the antenna
system
really _is_ important for good clean analogue audio.

IBOC splatter was certainly not taken into consideration in
the design of nearly, if not all, of the phasors in use today.

IBOC now requires low group delay across an even wider frequency range.
My
hope personally is that stations will be forced to upgrade their phasing
networks and antenna systems in order to implement IBOC-AM, which will
then
fail, leaving them with wider band antenna systems that result in higher
analogue audio quality.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."