Steve wrote:
In that case I think they'd better forget about DRM. A smarter move
would be for broadcasters to move to single sideband operations. This
might not give them a larger audience, but it would sure allow them to
cut a lot of their expenses. All they'd really need is a stock ham
transceiver and a dipole. And I'll bet that at this moment there are
more small receivers capable of receiving SSB than DRM.

Even better would be double-sideband-reduce-carrier. It's easy to generate
with DSP and sort of in between SSB and AM. It's basicly USB and LSB at the
same time. Twice the cost of SSB in terms of power and bandwidth, but far less
in power than AM.

It has the advantage that a standard AM receiver has no trouble with it.

The Sony IFC-2010 (ICF-2001D) was born because Sony had a warehouse of AM
stereo decoder chips and no market for them.

At this point it would not cost a lot of money to make a dedicated DSP
chip that would decode AM, DSBRC, and SSB at an IF of 445kHz. Possibly
a brodcasters or radio manufacturer's association could get together and
bankroll it.

Geoff.


--
Geoffrey S. Mendelson N3OWJ/4X1GM
To help restaurants, as part of the "stimulus package", everyone must order
dessert. As part of the socialized health plan, you are forbidden to eat it. :-)