[opendtv] Re: Latest S/N test
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "OpenDTV (E-mail)" <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 28 Jan 2005 16:01:08 -0500
Dale Kelly wrote:
> I was advised last year that Zarlink, RMT,
> and others, supply triple conversion receivers,
> with significantly better specs than A74, to
> the European COFDM markets, where they are
> serious about OTA performance.
Well, this sort of cutting corners kind of frosts
me, if that's indeed what's going on. I'll assume
that there isn't some overaching new reason to
attempt to go to single conversion for 8-VSB.
First of all, the advantages of multiple conversion
tuners aren't exactly news. The technique has been
used for multiple decades. Anyone who ever heard
the 5 or 10 KHz squeal in AM MW or shortwave radios
with single conversion tuners understands this
implicitly.
Also, with all the incredibly bad press 8-VSB
receiver manufaturers have been getting over the
past 7 or 8 years, you'd think they'd at least get
the most basic of basics right, wouldn't you? All
the equalizer prowess in the world isn't going to
fix such basic problems as IM distortion, right?
Perhaps it's the search for that -85 dBm
sensitivity that is driving this strange behavior?
Inquiring minds would love to know.
Bert
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