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Communication Transmission wire

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RITESH KAKKAR

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Hello,
If we talk about old TV cable connection how does the TV work with one single co axial wire there are large number of channel available how the sender send these signal and the receiver receive these signal.
which modulation does it use?
and large amount of tv channel were available?
 

A good coaxial cable will have a flat bandwidth of say, .5 to 900 MHZ. TV transmissions have a bandwidth of 6MHZ (Sytem I) and are transmitted in the upper half of the band from from about 421 MHZ upwards. So the lowest channel is on 421 MHZ, the next one on 427 MHZ, then 433 MHZ. Because of deficiencies in the receivers, then local channels are not next to each other. But are spread, CH1 = X MHZ, CH2 = X + 12MHZ, CH3 = X +24 MHZ....
The modulation for the vision carrier is vestigial sideband transmission, AM with one side band filtered off. The sound carrier is normally sat at Fv + 6MHZ and is FM.
Frank
 
As Usual, your right FvM, its the inter carrier (in the UK ) that is 6 MHZ. I think it gives the right flavour to the reply even if the numbers are wrong. :-(
Frank
 
[...]
Ritesh is asking very basic questions. I think he should go back to school to learn:
1) Basic English spelling and grammar.
2) Basic electronics including basic communications circuits.

I bet he hasn't even dreamed about 4k ultra high definition digital TV that we use every day and the 8k that is coming. Cars that steer themselves between the dotted lane markers and that slam on the brakes quicker than the driver can when there is something blocking the road.
Maybe he should be asking his questions on a website in India.
 
Last edited by a moderator:
I think he should go back to school to learn:
Click to expand...

In schol thee was less kits which was ready made.

- - - Updated - - -

A good coaxial cable will have a flat bandwidth of say, .5 to 900 MHZ. TV transmissions have a bandwidth of 6MHZ (Sytem I) and are transmitted in the upper half of the band from from about 421 MHZ upwards. So the lowest channel is on 421 MHZ, the next one on 427 MHZ, then 433 MHZ. Because of deficiencies in the receivers, then local channels are not next to each other. But are spread, CH1 = X MHZ, CH2 = X + 12MHZ, CH3 = X +24 MHZ....
The modulation for the vision carrier is vestigial sideband transmission, AM with one side band filtered off. The sound carrier is normally sat at Fv + 6MHZ and is FM.
Frank
Click to expand...

Hello,
I am unable to understand how single wire carries lot of sign
if we put 2 signal generator of sin wave at different frequency.
how the information is selected?
it does not cause interference?

- - - Updated - - -

Hello,
Here i am trying to pass two sin wave from one wire.
how to get receive two freq at end??
 

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Hello,
it is working how you chooses the CL value?
and the output is dammed , why?
 

"Hello,
I am unable to understand how single wire carries lot of sign
if we put 2 signal generator of sin wave at different frequency.
how the information is selected?
it does not cause interference? "
If you put lots of signals on a single wire, they stay totally isolated and will travel along the wire and ignore any other signals of a different frequency. So at the receiver the signals go through a filter that rejects unwanted signals ans accepts the wanted one.
Frank
 

Rejected signals cause heat ?
Click to expand...
Not necessarily. Filter can be absorptive or reflective, the difference isn't relevant for the filter characteristic.

Consider that the "communication transmission" examples in this thread are simplified to demonstrate the working principle of a selective receiver. Real receivers have selective amplifiers instead of passive filters, the latter are only used for input preselection.
 
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