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March 1st 11, 09:06 PM
posted to rec.radio.shortwave
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DRM and shortwave
On 3/1/2011 3:19 PM, wrote:
[...] DRM's 10kHz wide signal is preferable to the 30 kHz wide IBLOCK mode used on the AM band. [...] Yes it is. Almost anything is. Actually, though, DRM is a solid 11 kHz wide. With its even power distribution, it is far more annoying on HF when near a desired signal than is even a much wider high-fidelity AM signal, which has only intermittent high-frequency energy. Presently TDF Issoudun relays RFI via DRM on 3965 kHz (1 kw) and BBC Skelton uses 250 kW of DRM on 3955. Both, especially the BBC, play havoc with US amateur operations on 75 meters. With all good wishes, Kevin, WB4AIO. -- http://nationalvanguard.org/ http://kevinalfredstrom.com/ |
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