HD ENG from helicopter

Archived from groups: alt.tv.tech.hdtv (More info?)

Bob Miller <robmx@earthlink.net> wrote in news_8Bc.7889$w07.6505
@newsread2.news.pas.earthlink.net:

> I have mentioned that COFDM is being used in the cutting edge ENG
> business especially on helicoptors and vans. The above is an
eyewitness.
>
> http://www.tvtechnology.com/featur [...] High.shtml
>
> This was COFDM that delivered this HDTV feed.
>
> Some thy to argue that since they have seen drop-outs from helicopter
> footage COFDM doesn't work. Well not all ENG systems are COFDM only the
> best ones like those that deliver HDTV without a "glitch" from a moving
> helicopter in this report..
>

How exactly does that support your contention that we should junk our
current HD OTA infrastructure and replace it with COFDM technology? And
it really doesn't prove what you seem to think that it is - it indicates
that they were successfully broadcasting an HD feed from a moving
platform, but without more details (frequency band, bandwidth, receiver
set-up location, repeater info, etc.) it doesn't provide any indication
of how it would help me receive HD at my home.

All it shows is that COFDM may have some application for providing
broadcasters with a way to feed signals from remotes to their base
operations for remodulation and broadcast. It really doesn't matter what
technology is used for remotes for the end consumer; there are currently
many remote trucks equipped to bounce their remote feeds off of
satellite. The broadcaster then receives the signal from the satellite,
remodulates it and broadcasts it. I don't need to receive that signal
from the satellite if I want to watch the remote feed - I need to receive
the remodulated signal from the broadcaster. And the US standard for OTA
DTV and HDTV is not COFDM but it still manages to work quite well. For
example, I live in a shallow valley and get very poor reception of the
OTA analog signal from broadcasters that are approx. 50 miles away. With
my OTA HDTV receiver, I'm getting great DTV and HDTV reception from those
same receptions with the same antenna and I'm even getting good DTV and
HDTV reception from broadcasters that are 75-80 miles away. I couldn't
get anything near a watchable analog signal from those distant stations.

Archived from groups: alt.tv.tech.hdtv (More info?)

hmmmm wrote:

> COFDM is old news [pun] for 2-way links -- new systems are on to better
> modulation schemes. They probably picked COFDM because the industry
> admittedly has more experience doing wireless high-bandwidth bidi
> communication with this scheme than the latest cellphone modulations.
>
> Bob Miller wrote:
>
>> http://www.tvtechnology.com/featur [...] High.shtml
>>
>> This was COFDM that delivered this HDTV feed.
>>
>> Some thy to argue that since they have seen drop-outs from helicopter
>> footage COFDM doesn't work. Well not all ENG systems are COFDM only
>> the best ones like those that deliver HDTV without a "glitch" from a
>> moving helicopter in this report..
>>
>

I would be very interested in the latest cell phone modulations that you
think are superior to COFDM for high-bandwidth bidi.