RF Modulator and RF Modulator
 

Hello All

I've been told by about 3 people now (including people from Philex)
that it's not possible to modulate Svideo from a PC and to get a
colour picture. Something about the luminous and chromo pins.

So how comes when my PC boots up I get a colour picture but when the
OS is loaded it reverts back to black and white? Surely if the initial
picture is colour, the signals are getting sent correctly. I get a
nice blue HP splash screen and a nice Windows XP logo all in colour
but at the login screen it goes black and white!

I have an Svideo/Stereo to Scart cable running from my PC graphics
card to my RF modulator (Labgear MOD???)

Can someone give me a definitive answer on this?

Cheers

AJ

RF Modulator and RF Modulator
 

AJ wrote:
Hello All

I've been told by about 3 people now (including people from Philex)
that it's not possible to modulate Svideo from a PC and to get a
colour picture. Something about the luminous and chromo pins.

So how comes when my PC boots up I get a colour picture but when the
OS is loaded it reverts back to black and white? Surely if the initial
picture is colour, the signals are getting sent correctly. I get a
nice blue HP splash screen and a nice Windows XP logo all in colour
but at the login screen it goes black and white!

I have an Svideo/Stereo to Scart cable running from my PC graphics
card to my RF modulator (Labgear MOD???)

Can someone give me a definitive answer on this?

Your PC's Nvidia card chipset has both composite outputs and S-Video
outputs.

At a stage while your machine is booting, the card's internal composite
output (which is mixed chromo(color), luminous(brightness) and sync
info) is routed to the luminous pin on the S-Video connector.

When the Nvidia graphics drivers properly load (or summat) the luminous
pin in the S-video connector is now just carrying brightness/sync info,
and the chromo pin carries the colour.

The chromo pin is not connected anywhere in your UHF modulator (doesn't
expect it), hence you now don't get colour on your TV set.

Connecting the composite output from your PC to the modulator is the
only real option you have.

--
Adrian C

RF Modulator and RF Modulator
 

On 17 Nov, 15:33, Adrian C wrote:
AJ wrote:
Hello All

I've been told by about 3 people now (including people from Philex)
that it's not possible to modulate Svideo from a PC and to get a
colour picture. Something about the luminous and chromo pins.

So how comes when my PC boots up I get a colour picture but when the
OS is loaded it reverts back to black and white? Surely if the initial
picture is colour, the signals are getting sent correctly. I get a
nice blue HP splash screen and a nice Windows XP logo all in colour
but at the login screen it goes black and white!

I have an Svideo/Stereo to Scart cable running from my PC graphics
card to my RF modulator (Labgear MOD???)

Can someone give me a definitive answer on this?

Your PC's Nvidia card chipset has both composite outputs and S-Video
outputs.

At a stage while your machine is booting, the card's internal composite
output (which is mixed chromo(color), luminous(brightness) and sync
info) is routed to the luminous pin on the S-Video connector.

When the Nvidia graphics drivers properly load (or summat) the luminous
pin in the S-video connector is now just carrying brightness/sync info,
and the chromo pin carries the colour.

The chromo pin is not connected anywhere in your UHF modulator (doesn't
expect it), hence you now don't get colour on your TV set.

Connecting the composite output from your PC to the modulator is the
only real option you have.

--
Adrian C- Hide quoted text -

- Show quoted text -

Thanks Adrian

I have also heard that this has been done by someone who advised me to
buy a new connector. He assured me 100% that he has Svideo into an RF
mod and his picture is colour, he also said 100% it would work if I
bought the new connector!!!!.

Could this be something special on his graphics card?

The problem I am having with the composite output is that the signal
stops after the machine boots up so I get a blank screen so I'm not
sure what I can do now...............

Cheers

AJ

RF Modulator and RF Modulator
 

AJ wrote:

The problem I am having with the composite output is that the signal
stops after the machine boots up so I get a blank screen so I'm not
sure what I can do now...............

May be telling ye something you've already done... but..

http://nvidia.custhelp.com/cgi-bin/nvidia.cfg/php/enduser/std_adp.php?p_faqid=30&p_sid=kSFzrkBi

Selected PAL & Composite video out?

--
Adrian C

RF Modulator and RF Modulator
 

In article
,
AJ wrote:
I've been told by about 3 people now (including people from Philex)
that it's not possible to modulate Svideo from a PC and to get a
colour picture. Something about the luminous and chromo pins.

So how comes when my PC boots up I get a colour picture but when the
OS is loaded it reverts back to black and white? Surely if the initial
picture is colour, the signals are getting sent correctly. I get a
nice blue HP splash screen and a nice Windows XP logo all in colour
but at the login screen it goes black and white!

Probably something strange happening with your video card while booting.

I have an Svideo/Stereo to Scart cable running from my PC graphics
card to my RF modulator (Labgear MOD???)

Can someone give me a definitive answer on this?

Almost certainly the modulator can only cope with composite video so why
not feed it with that? There's no benefit in trying to use S-Video. In
other words the SCART socket on the modulator only accepts composite. So
you'll need a composite to SCART cable to feed it with. If for some reason
you only have an S-Video output you can matrix this to composite quite
easily.

--
*Strip mining prevents forest fires.

Dave Plowman London SW
To e-mail, change noise into sound.

RF Modulator and RF Modulator
 

"AJ" wrote in message
...
Hello All

I've been told by about 3 people now (including people from Philex)
that it's not possible to modulate Svideo from a PC and to get a
colour picture. Something about the luminous and chromo pins.

Depends what equipment you are using. I have a JVC S-VHS video recorder
that can take an S-Video input and output a UHF colour signal.


So how comes when my PC boots up I get a colour picture but when the
OS is loaded it reverts back to black and white? Surely if the initial
picture is colour, the signals are getting sent correctly. I get a
nice blue HP splash screen and a nice Windows XP logo all in colour
but at the login screen it goes black and white!

Check your international and graphics card settings - sounds like you may be
generating NTSC or SECAM when what you want is PAL - the first will appear
as black and white on a PAL set. If you have access to a multi-standard set
(I have one of these too) it should notice that the signal structure has
changed and still work.

Probably the PC boots with PAL coming out and then switched to NTSC once the
OS has loaded.


I have an Svideo/Stereo to Scart cable running from my PC graphics
card to my RF modulator (Labgear MOD???)

Alternatively you have a naf modulator.


Can someone give me a definitive answer on this?

Cheers

AJ

RF Modulator and RF Modulator
 

On 17 Nov, 16:11, Adrian C wrote:
AJ wrote:

The problem I am having with the composite output is that the signal
stops after the machine boots up so I get a blank screen so I'm not
sure what I can do now...............

May be telling ye something you've already done... but..

http://nvidia.custhelp.com/cgi-bin/nvidia.cfg/php/enduser/std_adp.php...

Selected PAL & Composite video out?

--
Adrian C

I actually did this earlier today after my posting to you. Basically I
downloaded the new drivers and attached my monitor cos I cant see
sqwat on my TV and cofigured everything. So all those people stating
that Svideo cannot be put through an RF modulator and produce a colour
picture are indeed wrong. I dont think the new cable helped at all but
I'm certainly not going to start messing with it again, what a
headache!

Thanks Adrian.

AJ

RF Modulator and RF Modulator
 

AJ wrote:
So all those people stating
that Svideo cannot be put through an RF modulator and produce a colour
picture are indeed wrong.

Actually, they are probably RIGHT!! What you have got working is
composite video NOT S-Video.

Don't worry - you've got something working now.... and that is good.

--
Adrian C

RF Modulator and RF Modulator
 

On 17 Nov, 20:37, Adrian C wrote:
AJ wrote:

So all those people stating

that Svideo cannot be put through an RF modulator and produce a colour
picture are indeed wrong.

Actually, they are probably RIGHT!! What you have got working is
composite video NOT S-Video.

Don't worry - you've got something working now.... and that is good.

--
Adrian C

How is that when I am taking the Svideo output from my Graphics card?
I'm not using composite i.e. the yellow plug


Thanks

AJ

RF Modulator and RF Modulator
 

In article
, AJ
wrote:

On 17 Nov, 20:37, Adrian C wrote:
AJ wrote:

So all those people stating

that Svideo cannot be put through an RF modulator and produce a colour
picture are indeed wrong.

Actually, they are probably RIGHT!! What you have got working is
composite video NOT S-Video.

Don't worry - you've got something working now.... and that is good.

--
Adrian C

How is that when I am taking the Svideo output from my Graphics card?
I'm not using composite i.e. the yellow plug


Thanks

AJ

An RF modulated TV signal can only be composite video - essentially a
black-and-white signal with a low-bandwidth signal containing two of
the colours modulated onto a sub-carrier. An S-video connection has
two separate leads, one containing the black-and-white and one
containing the same colour signal - because they are separate you don't
get the patterning where the colour signal interferes with the
black-and-white signal. If you have a modulator with an S-video input
then it is combining the two signals into composite video before RF
modulating it.