[TenTec] Slightly OT: SSB vs AM (Warning!: Heavy Sarcasm)

[Mark Erbaugh]

Bill,

No the current DRM project is to develop and test the methodology. There is
development (and there is a picture of a prototype) of standalone receivers
(even portables) that will be able to receive DRM.

However, from the one DRM broadcast that I monitored, I noticed that there
is no AM audio for a conventional receiver, so you must have a DRM receiver
to listen to a DRM broadcast.

In the past, the US government has mandated that new broadcast schemes (FM
stereo and color TV) be compatible with existing receivers. From what I read
about digital AM broadcasting, that is also true. However, HDTV appears to
not be compatible with existing receivers, so the government mandates that
all receivers sold after a certain date (2005?) be HDTV compatible.

Since DRM is an international project, there's no such requirement. Also,
I'm not aware of any domestic broadcasts in DRM so perhaps the FCC isn't
allowing it.

Mark

----- Original Message -----
From: "WILLIAM MANSEY; WA2PVK" <res0wsci at verizon.net>
To: <tentec at contesting.com>
Sent: Tuesday, April 22, 2003 23:26 PM
Subject: Re: [TenTec] Slightly OT: SSB vs AM (Warning!: Heavy Sarcasm)


> On a related note - - - Concerning this new DRM mode and receivers such as
> the RX-320 - is this to say that if you do not have such a receiver and/or
> computer with suitable sound card that you will NOT be able to listen to
SW
> broadcasts?  It would seem to me that more people are without such
equipment
> as there are with it.  Will DRM perhaps be compatible - much like color TV
> programs were required to be viewable on black and white televisions and
FM
> stereo transmissions compatible with monaural receivers. Actually my old
TV
> was not black and white!  It was more of a beige color!  :-)
> 73, Bill
> res0wsci at verizon.net
>
>
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