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From: Larry DeMers (no email)
Date: Sat Jul 01 2006 - 12:03:33 EDT
Jan and all,
This is my experience also. When the digital tuner works, it's
terrific and clear. But when the signal strength is below the tuners
threshold, it will have no output. My analog tuner however will have a
fine picture on it (never mind the quality of the content) far beyond
what the digital tuner 'sees'.
One thought occurs to me. With analog, amplifying the antenna
output before the tuner input works to some extent, but it has the
problem of amping the noise as well as the signal itself. With digital,
it would seem that an amplifier may be far more effective, since the
tuner will only detect the digital portion out of the spectrum.
True, the 'noise' portiion of the spectrum could mimic the actual
digital signal, but it's simple for the digital tuner to determine if
what it just detected is actually part of the true digital content or
just noise (this is done all of the time with computers in their
interchip communications protocol). This technology is brand new for
tv, so expect that there will be large strides forward in the
sensitivity and selectivity of the digital tv recievers in the near
future. The technology to do this has been out there for many years, and
doubtless it will be applied to succeeding versions of the digital tv
tuners as competition takes hold.
Cheers,
Larry DeMers
s/v DeLaMer
Jan Guthrie wrote:
> Lee,
> I have a flat panel digital TV and an analog tuner and a digital tuner
> .....
>
> *When* the digital tuner works, it is amazing. I am in a fringe area
> and the digital signals do not travel as far or as well as the analog
> signals. The digital tuner will often not lock into the channels, or
> not receive them at all.... at the same time the analog tuner will
> pick up the same channel with ease.
>
> Remember (a long, long time ago...) when we had analog cell phones ...
> and the signals were much further reaching than today's "digital
> equivalent".
>
> Jan
>
> Lee Haefele wrote:
>
>> An important item to consider buying a flat TV/monitor is to find one
>> that has an integrated digital station tuner. Most smaller models
>> are equipped only with an analog TV tuner. Throughout the USA, TV
>> stations have installed their mandated digital transmitters. The
>> digital transmission DOES NOT HAVE TYPICAL HARBOR RECEPTION PROBLEMS,
>> there is no ghosting, double image problem. In addition, most
>> stations are carrying a second or third channel within the digital
>> stream. It is quite impressive to turn on a TV and get 10 or more
>> clear channels. The problem today is that the smaller models of
>> flat TVs are not mandated to have a digital signal tuner, I was told
>> that 27" and up must include Digital tuner after Jan 2007. Separate
>> tuners are available, the last units I purchased for use at work were
>> the size of a VCR and cost $350.
>> If anyone has seen 15-17" TV/monitors with digital tuner included,
>> let me know. Also how do I determine if a screen is daylight viewable?
>> Lee Haefele
>> <snip>
>>
>>> THERE ARE MICRO SIZED DESKTOPS WHICH CAN RUN ON 12 VOLTS
>>> DIRECTLY, ARE EASIER TO UPGRADE AND REPAIR, AND ONE COULD PERMENANTLY
>>> INSTALL A MONITOR OR LARGE 32" hdtv WITH PC INPUT ON A BULKHEAD. OR
>>> ON/NEAR THE NAV STATION AND USE A WIRELESS KEYBOARD AND MOUSE WHICH
>>> COULD BE EASILY STOWED IN THE CHART TABLE.
>>>
>>> THE HDTV/MONITOR OPTION IS A GOOD ONE IN MY OPINION, SINCE YOU GET A
>>> NICE TV AND A NICE BIG MONITOR ALL IN ONE PURCHASE.
>>>
>>>
>>
>>>
>>
>>
>>
>
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