RG-59 & Amplifier?
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Posted by James Knott on March 11, 2005, 11:10 am
Please log in for more thread options Tomi Holger Engdahl wrote: >> In the USA, it's 5-42MHz. A 5-65MHz amp would be absolutely useless.
>
> > To my knowledge 5-65 MHz is used on some cable TV networks in Europe. > I think HTV in Finland uses it, at least at some parts of it's > network. Having more bandwidth for return channel allows more > bidirectional traffic in the network. In North America, Channel 2 starts at 56 MHz, so a return amp that reaches 65 MHz would block the lower channels. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Ed Nielsen on March 11, 2005, 10:10 am
Please log in for more thread options That would be 54MHz. CIAO! Ed N. James Knott wrote: > In North America, Channel 2 starts at 56 MHz, so a return amp that reaches
> 65 MHz would block the lower channels. > | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by James Knott on March 11, 2005, 3:14 pm
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Ed Nielsen wrote: > That would be 54MHz.
> Quite so. Typo on my part. Most people are not aware, that there used to be a channel 1 in North America, but it was reallocated, due to interference problems. The 50-54 MHz spectrum is now the 6 M amateur radio band. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Ed Nielsen on March 12, 2005, 12:08 pm
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Yes, a rather interesting history behind Channel 1. For a bit more detail, go to <http://www.cencom94.com/Download.html> and download
"Whatever happened to Channel ?" Some other good downloads there, as
well. Some pretty good stuff on the "Links" page, also. CIAO! Ed James Knott wrote: > Quite so. Typo on my part.
> > Most people are not aware, that there used to be a channel 1 in North > America, but it was reallocated, due to interference problems. The 50-54 > MHz spectrum is now the 6 M amateur radio band. > | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Tomi Holger Engdahl on March 13, 2005, 5:54 pm
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> Tomi Holger Engdahl wrote:
> > >> In the USA, it's 5-42MHz. A 5-65MHz amp would be absolutely useless.
> >
> > > > To my knowledge 5-65 MHz is used on some cable TV networks in Europe. > > I think HTV in Finland uses it, at least at some parts of it's > > network. Having more bandwidth for return channel allows more > > bidirectional traffic in the network. >
> In North America, Channel 2 starts at 56 MHz, so a return amp that reaches > 65 MHz would block the lower channels. It is true that using 5-65 MHz as return channel will block several lowers channels on the cable. And indeed here it does that. But that's not too much of a problem, because those are generally to much used and there are lots of channels on the higher frequencies. -- Tomi Engdahl (http://www.iki.fi/then/) Take a look at my electronics web links and documents at http://www.epanorama.net/ | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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