Another DTV VHF to UHF Change
K. B.
Fox officials say they're in the process of moving the
station's digital signal from a Very-high frequency (VHF) to
an Ultra-high frequency (UHF) channel to improve reception.
~~~
Kirk Bayne
alt.video.digital-tv Home Page
<http://avdtv.tripod.com/avdtv.htm>
Daniel W. Rouse Jr.
news:dbnsg5527ch60gnko...@4ax.com...
> <http://host.madison.com/wsj/news/local/article_1d82817f-4547-5ee5-b460-46b90e2770b8.html>
>
> Fox officials say they're in the process of moving the
> station's digital signal from a Very-high frequency (VHF) to
> an Ultra-high frequency (UHF) channel to improve reception.
>
calculating the propagation/reception factors, right?
K. B.
<dwro...@nethere.comNOSPAM> posted:
>So again, positive proof that the broadcasters and the FCC screwed up when
>calculating the propagation/reception factors, right?
I haven't heard of any DTV broadcasters wanting to move from
UHF to VHF to improve reception.
Moving to UHF could be related to the desire to transmit
Mobile DTV, which is said to work better in the UHF band.
Sal M. Onella
> I haven't heard of any DTV broadcasters wanting to move from
> UHF to VHF to improve reception.
>
> Moving to UHF could be related to the desire to transmit
> Mobile DTV, which is said to work better in the UHF band.
>
> Kirk Bayne
Yes. This is related to the antenna size. Any given frequency is
transmitted/received best with an antenna whose elements are said to
be "resonant." The first rule of building a resonant antenna is to
size the elements for the frequency. (This is the reason common TV
antennas have multiple elements of different lengths: TV channels are
assigned multiple different frequencies, so the manufacturers provide
elements that resonate at or near all those many frequencies.)
The higher frequencies require resonant elements that are shorter and
hence can be built into a mobile device and actually grab enough
signal to work. Any hunk of metal will receive something from all
signals; the trick is to have a _suitable_ antenna that receives
enough of the signal you need.
RELATED:
When mobile is being transmitted in more places, are people with
"problem reception" going to be able to use mobile devices for more
reliable home reception? I realize that the mobile portion of the
signal is not going to deliver good HD, but if someone's been going
crazy because of signal problems, a solid SD picture might be a
calming influence. I don't know.
Sal
------------------------------------------------------------------------------------
Nothing about Socialism is any good at all. You're entitled to
have what you've worked for, not what I've worked for.
TJ
> When mobile is being transmitted in more places, are people with
> "problem reception" going to be able to use mobile devices for more
> reliable home reception? I realize that the mobile portion of the
> signal is not going to deliver good HD, but if someone's been going
> crazy because of signal problems, a solid SD picture might be a
> calming influence. I don't know.
>
Assuming the mobile services can provide the necessary bandwidth without
compromising service to their primary customer base, I don't see why
not. Sounds like a good money maker for them, like for the cable and
satellite providers. Might help bring costs down through competition for
everybody getting pay TV.
TJ
robinlos
>
> Nothing about Socialism is any good at all. You're entitled to
> have what you've worked for, not what I've worked for.
I like the notion of a more penetrating, robust, OTA signal, such as
is being used for mobile today, as the broadcast standard. Television
stations could feed whatever they wished to service providers, as many
progams in whatever definition as the business envelop would hold.
But, there would be a more recievable OTA signal available. Some
broadcasters have already provided programs to cable that are not
broadcast. There is still a good bit of unused space to accomplish a
good, well recieved OTA service with some variety. I still think that
the airwaves owned by the public should be used for the public, and
not be constantly reduced for other purposes.