🚀 go-pugleaf

"Green Xenon [Radium]" <glucegen1@excite.com> wrote in message 
news:46f6d850$0$11068$4c368faf@roadrunner.com...
> Hi:
>
> One major reason the luminance signals of television are broadcasted on an 
> AM-carrier instead of FM is because FM requires large amounts of 
> bandwidth. Is there a way to use FM video without hogging so much 
> bandwidth?
>
> Quotes from 
> http://groups.google.com/group/sci.electronics.basics/msg/0c013cf5371da8dc?hl=en& :
>
> >Multiple-level quadrature modulation,
> >"constellation modulation",
> >is most common for packing
> >lots of bits per Hz of bandwidth.
> >The more you pack,
> >the better the s/n ratio has to be.
>
> >http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation
>
> >http://en.wikipedia.org/wiki/Constellation_diagram
>
> Does this mean that Quadrature Modulation and Constellation Modulation 
> can -- at least in theory -- be applied to FM video so that excessive 
> bandwidth is not needed? If so, then what would be the minimum 
> radio-frequency required to transmit the video signal?

No.

These are like special modified forms of AM.

You can only use these to reduce bandwidth of an FM signal in the same way 
that you can use AM to reduce the bandwidth of an FM signal. It just won't 
be FM any more.

-- 

Brian Gregory. (In the UK)
ng@bgdsv.co.uk
To email me remove the letter vee. 

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Green Xenon [Radium] wrote:
> Hi:
> 
> One major reason the luminance signals of television are broadcasted on
> an AM-carrier instead of FM is because FM requires large amounts of
> bandwidth. Is there a way to use FM video without hogging so much
> bandwidth?
> 
> Quotes from
> http://groups.google.com/group/sci.electronics.basics/msg/0c013cf5371da8dc?hl=en&
> :
> 
>>Multiple-level quadrature modulation,
>>"constellation modulation",
>>is most common for packing
>>lots of bits per Hz of bandwidth.
>>The more you pack,
>>the better the s/n ratio has to be.
> 
>>http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation
> 
>>http://en.wikipedia.org/wiki/Constellation_diagram
> 
> Does this mean that Quadrature Modulation and Constellation Modulation
> can -- at least in theory -- be applied to FM video so that excessive
> bandwidth is not needed? If so, then what would be the minimum
> radio-frequency required to transmit the video signal?
> 
> 
> Thanks,
> 
> Radium

Okay now you're actualy irritating me quite a LOT.

Please, do yourself a favour: buy an Amazon book voucher and shut up.

- --
Brendan Gillatt
brendan {at} brendangillatt {dot} co {dot} uk
http://www.brendangillatt.co.uk
PGP Key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBACD7433
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"Brian Gregory [UK]" wrote:
> 
> "Green Xenon [Radium]" <glucegen1@excite.com> wrote in message
> news:46f6d850$0$11068$4c368faf@roadrunner.com...
> > Hi:
> >
> > One major reason the luminance signals of television are broadcasted on an
> > AM-carrier instead of FM is because FM requires large amounts of
> > bandwidth. Is there a way to use FM video without hogging so much
> > bandwidth?
> >
> > Quotes from
> > http://groups.google.com/group/sci.electronics.basics/msg/0c013cf5371da8dc?hl=en& :
> >
> > >Multiple-level quadrature modulation,
> > >"constellation modulation",
> > >is most common for packing
> > >lots of bits per Hz of bandwidth.
> > >The more you pack,
> > >the better the s/n ratio has to be.
> >
> > >http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation
> >
> > >http://en.wikipedia.org/wiki/Constellation_diagram
> >
> > Does this mean that Quadrature Modulation and Constellation Modulation
> > can -- at least in theory -- be applied to FM video so that excessive
> > bandwidth is not needed? If so, then what would be the minimum
> > radio-frequency required to transmit the video signal?
> 
> No.
> 
> These are like special modified forms of AM.
> 
> You can only use these to reduce bandwidth of an FM signal in the same way
> that you can use AM to reduce the bandwidth of an FM signal. It just won't
> be FM any more.


   radium is a troll.  he tries this crap on a lot ot different
newsgroups, and asks stupid questions to entertain himself.  If you
don't believe me. look at his posting history on Google Groups, then
kill file him.


-- 
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

On Sep 24, 12:59 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
wrote:
> "Brian Gregory [UK]" wrote:
>
> > "Green Xenon [Radium]" <gluceg...@excite.com> wrote in message
> >news:46f6d850$0$11068$4c368faf@roadrunner.com...
> > > Hi:
>
> > > One major reason the luminance signals of television are broadcasted on an
> > > AM-carrier instead of FM is because FM requires large amounts of
> > > bandwidth. Is there a way to use FM video without hogging so much
> > > bandwidth?
>
> > > Quotes from
> > >http://groups.google.com/group/sci.electronics.basics/msg/0c013cf5371...:
>
> > > >Multiple-level quadrature modulation,
> > > >"constellation modulation",
> > > >is most common for packing
> > > >lots of bits per Hz of bandwidth.
> > > >The more you pack,
> > > >the better the s/n ratio has to be.
>
> > > >http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation
>
> > > >http://en.wikipedia.org/wiki/Constellation_diagram
>
> > > Does this mean that Quadrature Modulation and Constellation Modulation
> > > can -- at least in theory -- be applied to FM video so that excessive
> > > bandwidth is not needed? If so, then what would be the minimum
> > > radio-frequency required to transmit the video signal?
>
> > No.
>
> > These are like special modified forms of AM.
>
> > You can only use these to reduce bandwidth of an FM signal in the same way
> > that you can use AM to reduce the bandwidth of an FM signal. It just won't
> > be FM any more.
>
>    radium is a troll.  he tries this crap on a lot ot different
> newsgroups, and asks stupid questions to entertain himself.  If you
> don't believe me. look at his posting history on Google Groups, then
> kill file him.
>
> --
> Service to my country? Been there, Done that, and I've got my DD214 to
> prove it.
> Member of DAV #85.
>
> Michael A. Terrell
> Central Florida

We're all trolls, damn you, least the exceptional you.