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G8TZJ > DIGITV 09.07.09 08:02l 47 Lines 1914 Bytes #999 (0) @ WW
BID : 430479G8TZJ
Read: GUEST
Subj: Re: Isn't it great ?!
Path: IZ3LSV<IK2XDE<DB0RES<DK0WUE<GB7FCR
Sent: 090708/2153Z @:GB7FCR.#16.GBR.EU #:29452 [Blackpool] FBB-7.03a $:430479G8
From: G8TZJ@GB7FCR.#16.GBR.EU
To : DIGITV@WW
Ian wrote:-
> Even though I am in a good TV reception area with no QRM from vehicles or
> the nearest factories which are over half a mile away, I had been getting
> blocking, hiccups on sound and sometimes, even 'candy striping' and loss
> of colour which used to be typical of a foulty reference oscil;lator on
> analogue TV.
>
> " All my own fault." I had thought until today while watching a segment of
> the BBC news. The roving reporter was doing a piece which included
> describing a local vocal group. He said: " they do hic hic and hic hic as
> well as hic hic and hic hic, what do you think of that ?" To the to studio
> presenters.
>
> They said " probably very good but we couldn't tell what you were talking
> about."
> His mouth was pixelatated as he spoke which made them unable to lip read
> either.
>
> So it isn't all the fault of my DTB set top box, after all.
>
> The BBC is constantly bragging about the quality of it's broadcasting and
> tha, for a few Pounds extra we can even watch it in HD.
>
> I wonder if you get less faults on HDTV ?
This effect is typical of a "radio camera" that uses a MPEG digital link.
At this news site, there would be a satellite truck uplinking the news
feed from the camera. The link between the sat truck and the camera would
be a digital link in the circa 3 to 5 GHz range. (Gone are the days of
using a cable between the two. Its a tripping hazzard.) If there are any
obstructions such as trees, passing vehicles etc or simply multi-path
reception of the camera's signal, then the MPEG digital link breaks down.
In years past these links were analogue and when problems arose, the
picture simply got noisy for a few seconds.
Its called progress! You fix one problem and create new ones.
73 - Andrew, G8TZJ @ GB7FCR.#16.GBR.EU
Message timed: 22:30 on 2009-Jul-08
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