[opendtv] Re: MIMO

This concept requires that broadcasters utilize CP antennas for
transmission, the cost to do so is significant, requiring double the
transmitter power and a more expensive antenna system. Our company has
constructed a number of UHF CP stations over the years and our experience is
that reception is improved significantly, even using standard receive
antenna, particularly indoors. Results for DTV reception should be little
different, IMO.
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx
> [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Cliff Benham
> Sent: Monday, April 30, 2007 12:31 PM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: MIMO
>
>
>
>
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx
> [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of John Shutt
> Sent: Monday, April 30, 2007 2:29 PM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: MIMO
>
>
> >TANSTAAFL.
> ISBIDKWTM.
>
> >Bowtie antennas, UHF Loop Antennas, and Rabbit Ears do not respond to
> >circular polarization in the same way as a purpose built circularly
> >polarized receive antenna does.
>
> I understand that. I presently have a huge 17db gain parabolic UHF antenna
> 28 ft.
> in the air with a mast mounted preamp and RG-11 cable, but would gladly
> replace it
> with a circularly polarized type and add a rotor if it meant I
> could at last
> get
> 'broadcast quality' ATSC reception.
>
> My question remains unanswered. How much testing has ever been done on
> ATSC rception using circular polarization? How well does it actually work
> compared to the sputtering, freezing, choppy ATSC 'reception' I
> now endure?
>
> > To get the anti-ghosting benefit, you would
> >have to have an outdoor antenna that was mounted on a mast and rotor.
> >(Being a CP antenna, it is also by definition directional.)
>
> Fine,I'm certainly willing to do all that. I just expect it to work far
> better than
> what I have now. See pic.
> Cliff
>
> John.
>
>
> ----- Original Message -----
> From: "Cliff Benham" <flyback1@xxxxxxxxxxx>
>
> > For ATSC this idea seems like a huge miss. Where was it 10 years ago?
> > I have not ever seen this expressed anywhere before now.
>
>


 
 
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