how to code a video signal?

  • Thread starter Rudolf Ladyzhenskii
  • Start date
R

Rudolf Ladyzhenskii

Guest
Hi, all

I want to mix a particular signal into TV antenna signal. And I only want
selective TVs to receive it.
So, I need something that will "encode" the signal at the source and
"decode" it at destinations. Something simple, like introducing a noise at
the source and filter it at destination.

Similar systems are used in Europe for Pay TV. I only have to encode a
single channel.
Does anyone have schematics? Or may be someone sells those in Australia?

Any help is appreciated.

Thaks,
Rudolf
 
"Rudolf Ladyzhenskii"
I want to mix a particular signal into TV antenna signal. And I only want
selective TVs to receive it.
So, I need something that will "encode" the signal at the source and
"decode" it at destinations. Something simple, like introducing a noise at
the source and filter it at destination.

Similar systems are used in Europe for Pay TV. I only have to encode a
single channel.
Does anyone have schematics? Or may be someone sells those in Australia?
Click to expand...


** Rudolf the Red knows reindeer ...

But SFA else.



........... Phil
 
Do you have a narrowcast licence from the ACA? I assume you want to
transmit more than 100mW or further than about 30 metres.

If not you will need to get legal and look for low power (1 - 25 watt)
UHF digital transmitters from various sources mainly overseas. These
generally have selectable UHF frequencies and channel codes but no
encryption which is what you were eluding to. You want that and you are
talking tens of thousands per encoder unit and hundreds per decoder.

Rudolf wrote:

Hi, all

I want to mix a particular signal into TV antenna signal. And I only want
selective TVs to receive it.
So, I need something that will "encode" the signal at the source and
"decode" it at destinations. Something simple, like introducing a noise at
the source and filter it at destination.
Click to expand...
 
Hi,

I want to transmit on the wire. Signal will be mixed with TV antenna signal.

Rudolf

"Dan Marz" <medcircDELETETHIS@tpg.com.au> wrote in message
news:40f5e7f5@dnews.tpgi.com.au...
Do you have a narrowcast licence from the ACA? I assume you want to
transmit more than 100mW or further than about 30 metres.

If not you will need to get legal and look for low power (1 - 25 watt)
UHF digital transmitters from various sources mainly overseas. These
generally have selectable UHF frequencies and channel codes but no
encryption which is what you were eluding to. You want that and you are
talking tens of thousands per encoder unit and hundreds per decoder.

Rudolf wrote:

Hi, all

I want to mix a particular signal into TV antenna signal. And I only
want
selective TVs to receive it.
So, I need something that will "encode" the signal at the source and
"decode" it at destinations. Something simple, like introducing a noise
at
the source and filter it at destination.
Click to expand...
 
"Rudolf Ladyzhenskii" <rudolfl@optusnet.com.au> wrote in message news:<40f65abd$0$16105$afc38c87@news.optusnet.com.au>...
Hi,

I want to transmit on the wire. Signal will be mixed with TV antenna signal.

Rudolf

"Dan Marz" <medcircDELETETHIS@tpg.com.au> wrote in message
news:40f5e7f5@dnews.tpgi.com.au...
Do you have a narrowcast licence from the ACA? I assume you want to
transmit more than 100mW or further than about 30 metres.

If not you will need to get legal and look for low power (1 - 25 watt)
UHF digital transmitters from various sources mainly overseas. These
generally have selectable UHF frequencies and channel codes but no
encryption which is what you were eluding to. You want that and you are
talking tens of thousands per encoder unit and hundreds per decoder.

Rudolf wrote:

Hi, all

I want to mix a particular signal into TV antenna signal. And I only
want
selective TVs to receive it.
So, I need something that will "encode" the signal at the source and
"decode" it at destinations. Something simple, like introducing a noise
at
the source and filter it at destination.
Click to expand...
What sort of data rate are you looking at?
What distance do you need?
Is cost an issue?
Might be hard to get an off-the-shelf solution for this, they all seem
to be designed for custom applications.
Might be easier to use the many wireless modem solutions available
these days?

Otherwise you are looking at DC blocking filters, custom diplexers
etc. Cheap, and most likely do-able, but experimentation required.

Regards
Dave :)
 
What sort of data rate are you looking at?
As I said --analog video signal. For example from VCR.
Click to expand...

What distance do you need?
Doe not matter -- I will use amplifier if I need to.
Click to expand...

Is cost an issue?
Absolutely.
Click to expand...

Might be hard to get an off-the-shelf solution for this, they all seem
to be designed for custom applications.
This is why I am asking the question. I'd rather get an off-the shelf unit.
Click to expand...


Might be easier to use the many wireless modem solutions available
these days?
signal is not digital
Click to expand...

Rudolf
 
On Fri, 16 Jul 2004 18:38:57 +1000, "Rudolf Ladyzhenskii" <rudolfl@optusnet.com.au> wrote:

What sort of data rate are you looking at?
As I said --analog video signal. For example from VCR.

What distance do you need?
Doe not matter -- I will use amplifier if I need to.

Is cost an issue?
Absolutely.

Might be hard to get an off-the-shelf solution for this, they all seem
to be designed for custom applications.
This is why I am asking the question. I'd rather get an off-the shelf unit.


Might be easier to use the many wireless modem solutions available
these days?
signal is not digital

Rudolf
Click to expand...
Have you asked Hills Transmission Solutions, or Hills Antenna and TV Systems divisions?
 
"Rudolf Ladyzhenskii" <rudolfl@optusnet.com.au> wrote in message
news:40f79490$0$18190$afc38c87@news.optusnet.com.au...
What sort of data rate are you looking at?
As I said --analog video signal. For example from VCR.

What distance do you need?
Doe not matter -- I will use amplifier if I need to.

Is cost an issue?
Absolutely.

Might be hard to get an off-the-shelf solution for this, they all seem
to be designed for custom applications.
This is why I am asking the question. I'd rather get an off-the shelf
unit.


Might be easier to use the many wireless modem solutions available
these days?
signal is not digital

Rudolf


How about multiple modulators set to different frequencies?
Click to expand...

Ken
 
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