From Radio World:










Proposed Alaska test of Digital Radio Mondiale on three shortwave
frequencies inFCC application from Digital Aurora Radio Technologies for
experimental authorization. The DoD-funded test would use Continental
transmitters designed for an Over-the-Horizon radar transmitting system and
a digital signal generator operating from the Delta Junction area.

“Compared to an ordinary analog shortwave signal, the DRM signal can
operate with the same coverage reliably … in a 10 kHz channel using a
transmitter power level approximately one-fifth of that needed for the
analog signal,” states Digital Aurora in the application, which remains
pending at the commission.

The company hopes to determine the “impact of high-latitude
ionospheric propagation in the shortwave bands on digital audio modulation
using the DRM system,” as well as determine what transmission power levels
will produce a reliable signal that can be received on DRM radios. Digital
Aurora also hopes to determine an antenna specification to deliver a signal
statewide.

Judging from the application, the two-year test proposal appears
notable because it would be the first time DRM has been tested in the U.S.
at such high latitudes, and because the company is proposing to broadcast
using digital shortwave technology to an entire state.

Digital Aurora believes it can contain most of the signal within
Alaska with little spillover into Canada. To avoid causing interference it
plans to stay at least two adjacent channels away from any channels used by
international broadcasters into western Canada.

David Eduardo wrote:

From Radio World:

Proposed Alaska test of Digital Radio Mondiale on three shortwave
frequencies inFCC application from Digital Aurora Radio Technologies for
experimental authorization. The DoD-funded test would use Continental
transmitters designed for an Over-the-Horizon radar transmitting system and
a digital signal generator operating from the Delta Junction area.

“Compared to an ordinary analog shortwave signal, the DRM signal can
operate with the same coverage reliably … in a 10 kHz channel using a
transmitter power level approximately one-fifth of that needed for the
analog signal,” states Digital Aurora in the application, which remains
pending at the commission.

The company hopes to determine the “impact of high-latitude
ionospheric propagation in the shortwave bands on digital audio modulation
using the DRM system,” as well as determine what transmission power levels
will produce a reliable signal that can be received on DRM radios. Digital
Aurora also hopes to determine an antenna specification to deliver a signal
statewide.

Judging from the application, the two-year test proposal appears
notable because it would be the first time DRM has been tested in the U.S.
at such high latitudes, and because the company is proposing to broadcast
using digital shortwave technology to an entire state.

Digital Aurora believes it can contain most of the signal within
Alaska with little spillover into Canada. To avoid causing interference it
plans to stay at least two adjacent channels away from any channels used by
international broadcasters into western Canada.

More QRM.

"dxAce" wrote in message
...



More QRM.



On the other hand, if this works, it could become a revitalizing force for
SW to cover sparsely populated and remote areas of the world and even
reverse the decline in SW station numbers.

David Eduardo wrote:

"dxAce" wrote in message
...



More QRM.



On the other hand, if this works, it could become a revitalizing force for
SW to cover sparsely populated and remote areas of the world and even
reverse the decline in SW station numbers.

Like your stupid IBOC works?

Pay attention, 'Eduardo', it will only mean more QRM.

msg wrote:

dxAce wrote:


David Eduardo wrote:


"dxAce" wrote in message
...



More QRM.



On the other hand, if this works, it could become a revitalizing force for
SW to cover sparsely populated and remote areas of the world and even
reverse the decline in SW station numbers.


Like your stupid IBOC works?

Pay attention, 'Eduardo', it will only mean more QRM.



I do not have the luxury of living in a radio quiet area; I battle
monumental QRN and RFI from hosts of consumer and industrial devices.
I for one, would welcome a reliable modulation method that punches
through that mess, and if a digital scheme on SW that respects
known adjacent channels will do this, I am interested.

Forget it. DRM = QRM.

dxAce wrote:


David Eduardo wrote:


"dxAce" wrote in message
...



More QRM.



On the other hand, if this works, it could become a revitalizing force for
SW to cover sparsely populated and remote areas of the world and even
reverse the decline in SW station numbers.


Like your stupid IBOC works?

Pay attention, 'Eduardo', it will only mean more QRM.



I do not have the luxury of living in a radio quiet area; I battle
monumental QRN and RFI from hosts of consumer and industrial devices.
I for one, would welcome a reliable modulation method that punches
through that mess, and if a digital scheme on SW that respects
known adjacent channels will do this, I am interested.

Michael

"dxAce" wrote in message
...


David Eduardo wrote:

"dxAce" wrote in message
...



More QRM.



On the other hand, if this works, it could become a revitalizing force
for
SW to cover sparsely populated and remote areas of the world and even
reverse the decline in SW station numbers.

Like your stupid IBOC works?

Pay attention, 'Eduardo', it will only mean more QRM.

.... on an otherwise empty band if trends continue as they have been.

"dxAce" wrote in message
...


msg wrote:

dxAce wrote:


David Eduardo wrote:


"dxAce" wrote in message
...



More QRM.



On the other hand, if this works, it could become a revitalizing force
for
SW to cover sparsely populated and remote areas of the world and even
reverse the decline in SW station numbers.


Like your stupid IBOC works?

Pay attention, 'Eduardo', it will only mean more QRM.



I do not have the luxury of living in a radio quiet area; I battle
monumental QRN and RFI from hosts of consumer and industrial devices.
I for one, would welcome a reliable modulation method that punches
through that mess, and if a digital scheme on SW that respects
known adjacent channels will do this, I am interested.

Forget it. DRM = QRM.


Ace would rather have no stations than stations using digital modulation.

David Eduardo wrote:

"dxAce" wrote in message
...


msg wrote:

dxAce wrote:


David Eduardo wrote:


"dxAce" wrote in message
...



More QRM.



On the other hand, if this works, it could become a revitalizing force
for
SW to cover sparsely populated and remote areas of the world and even
reverse the decline in SW station numbers.


Like your stupid IBOC works?

Pay attention, 'Eduardo', it will only mean more QRM.



I do not have the luxury of living in a radio quiet area; I battle
monumental QRN and RFI from hosts of consumer and industrial devices.
I for one, would welcome a reliable modulation method that punches
through that mess, and if a digital scheme on SW that respects
known adjacent channels will do this, I am interested.

Forget it. DRM = QRM.


Ace would rather have no stations than stations using digital modulation.

Pay attention, 'Eduardo' ... I'd rather not have any QRM.

dxAce wrote:

msg wrote:

dxAce wrote:

David Eduardo wrote:


"dxAce" wrote in message
...


More QRM.


On the other hand, if this works, it could become a revitalizing force for
SW to cover sparsely populated and remote areas of the world and even
reverse the decline in SW station numbers.

Like your stupid IBOC works?

Pay attention, 'Eduardo', it will only mean more QRM.


I do not have the luxury of living in a radio quiet area; I battle
monumental QRN and RFI from hosts of consumer and industrial devices.
I for one, would welcome a reliable modulation method that punches
through that mess, and if a digital scheme on SW that respects
known adjacent channels will do this, I am interested.

Forget it. DRM = QRM.




I know I'm going to hell for this, but.....


If IBOC kept it's crap within the channel of the station's
allocation, it wouldn't be near the problem it is, today. That's where
it differs from DRM. DRM is contained within channel, and provides,
often-but not always, better audio clarity, with surprisingly less power.

Not to say I'm a big fan of DRM, because, right now, more often than
not, it's a pain in the ass, but if implemented as promised, DRM offers
more to the radio listening public than IBOC ever will.

What DRM has to deal with is the propagation characteristics of HF.
And that may be the razor by which we judge DRM.

But...and I say this with caution, and knowing that I stand a great
risk of agreeing with those with whom I've disagreed in the past...I'm
of the opinion that if DRM can be implemented in such a manner as it
respects the SW bandplan, and can keep it's splatter within it's own
channel, DRM may well be the solution that IBOC was meant to be.