On Fri, 2006-06-02 at 19:49, Bill Tippett wrote:
> Also keep an eye on Flex-Radio. The new SDR-X
> promises some very innovative solutions to QRM,
> (such as totally eliminating an offending station
> including in-band splatter). Their direct-conversion
Good point; I don't think current DSP firmware (in any radio) comes
anywhere near reaching DSP's potential.
I just bought a HD radio. (USA version of DAB - editorial comments in
private email on request...) On the MW (AM) band, the digital signal is
transmitted in the two adjacent frequencies - for a station whose analog
signal is on 700KHz, the digital is transmitted in 685-695 and 705-715.
Obviously, any stations on 680-690-710-720 get pretty well trashed.
Except on the HD set, which receives them clearly! (in analog mode)
Its DSP circuitry is able to remove in-channel QRM.
Our current ultra-sharp filters, autonotches, and noise reduction are
only the tip of the iceberg.
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com
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