[opendtv] Re: Latest S/N test
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 26 Jan 2005 21:33:30 -0800
Bert wrote:
> I thought that dual conversion tuners were designed
> specifically to combat intermediation (and
> cross-modulation?).
If I recall correctly, a single conversion tuner can work
OK in a packed RF environment if it incorporates
a decent tracking filter, which is/was expensive.
Possibly, in modern chip design, such a device can be
incorporated into the silicon?
> I guess you have to watch out for those more
> obscure performance measures, such as this third
> order intercept power. Maybe that's one reason
> the LG 5th gen does so well, even with all those
> analog stations still on the air.
My thinking also. I have always suspected that the
reception problem in Mark's appt. might have as much
to do with RF overload and image issues as it does
with multipath. Lacking performance specs for that specific
Zenith receiver, we may never know.
----- Original Message -----
From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
To: "OpenDTV (E-mail)" <opendtv@xxxxxxxxxxxxx>
Sent: Wednesday, January 26, 2005 1:14 PM
Subject: [opendtv] Re: Latest S/N test
> Dale Kelly WROTE:
>
>> RF interference and other related distortion
>> issues also greatly impact channel S/N performance
>> and tend to be overlooked. The attached URL is for
>> one of a series of articles written on the subject
>> by the highly regarded engineer, Charles Rhodes. I
>> believe you will find this and his other relates
>> articles of interest.
>>
>> =
> http://www.tvtechnology.com/features/digital_tv/f_DTV_interference.shtml
>
> Thanks, Dale. Excellent article.
>
> I thought that dual conversion tuners were designed
> specifically to combat intermodulation (and
> cross-modulation?). Which is why I was surprised to
> see a couple of recent press releases, where the
> manufacturers were touting their single-conversion
> chips as being something great. Maybe great, but
> mainly for cost reasons, no?
>
> I guess you have to watch out for those more
> obscure performance measures, such as this third
> order intercept power. Maybe that's one reason
> the LG 5th gen does so well, even with all those
> analog stations still on the air.
>
> Bert
>
>
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