[Boatanchors] Short Wave Broadcasts

[Michael Clarson]

Keith: There was a technique that transmitted one sideband, carrier, and
only low frequencies in the other sideband. It was called Power Side
Modulation and it maintained fidelity when using envelope detectors. Its
pretty much the same technique used in analog TV transmitters -- Vestigial
Sideband, Kept video within the 6 MHz channel while significantly reducing
bandwidth and power somewhat. --Mike, WV2ZOW


On Fri, Apr 18, 2014 at 9:10 AM, Keith Densmore <ve3gem at gmail.com> wrote:

> Sheldon et al,
> I have a couple of questions.....
>
> Why haven't broadcasters gone to single sideband AM? From what I
> understand, it loses no fidelity yet requires about half the power for the
> same signal level?
>
> How come the religious broadcaster get frequencies outside the normal SW
> broadcast spectrum? You hear them all over the dial and some are
> broadcasting from the US or other first world countries? If I operated out
> of band with multi kilowatts, you can bet I'd be shut down quick!
>
> Sheldon, I'd love to see some info on 4x4 or 4x6 dipole arrays that get
> 15-25 db gain. Any info on that on the 'net.
>
> Inquiring minds want to know!
>
> Keith VE3TS
>
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