RF Modulating a Scart output ...

[Philip]

I wonder if anyone could give some advice or an opinion about the possibility
of using a cheap Playstation RF Modulator to feed the output of a Scart output
only device (eg digital television receiver) into an old RF input only television?

The RF Modulator box (after snipping off the Playstation plug) has four
wires: Ground, +5v, Video, Audio

I tried wiring it to one of those Scart plugs with three phono outputs:
Video, Audio L, Audio R - but I got nowhere!

Any ideas?

Phil.
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[John Miller]

Hmm. What supplies the +5V? The PlayStation or the modulator? If the
former, you'd need to provide your own +5V.

Can you share exactly how you wired it up?

John.

"Philip" <ignore_your_spam@yahoo.co.uk> wrote in message
news:cd13rq$op8$1@hercules.btinternet.com...

I wonder if anyone could give some advice or an opinion about the
possibility
of using a cheap Playstation RF Modulator to feed the output of a Scart
output
only device (eg digital television receiver) into an old RF input only
television?

The RF Modulator box (after snipping off the Playstation plug) has four
wires: Ground, +5v, Video, Audio

I tried wiring it to one of those Scart plugs with three phono outputs:
Video, Audio L, Audio R - but I got nowhere!

Any ideas?

Phil.
--
Warning: Incoming mail will be automatically pre-filtered for suspected
Spam.

 

[Philip]

John Miller <me@nowhere.com> wrote:

Hmm. What supplies the +5V? The PlayStation or the modulator? If the
former, you'd need to provide your own +5V.

I used a small (300 mA) seperate PSU set on 4.5V but outputing 4.9V according
to a multimeter - normally the PlayStation provides the power.

Can you share exactly how you wired it up?

Ok - the RF Modulator had a four wire input: Ground, +5v, Video, Audio

"Ground" and "+5v" came from the PSU
Pin 19 of the Scart (CVBS output) was connected to "Video"
Pin 3 (Left Audio) was connected to "Audio"

The two returns for Scart Pins 19 and 3 (ie 21 and 5 iirc) were linked
to Ground too.

Didn't seem to work at all. Even just powering the modulator without
connecting the audio and video signals seemed to severely degrade the
"passed through" aerial connection, making the standard channels very bad.

Phil.

 

[John Miller]

Hello,

First - a dumb question: is there a signal on Pin 19? i.e., does the video
source the SCART is connected to send out a video signal? (You never know!)

It might have something to do with connecting the modulator's ground to the
SCART returns. i.e., the returns may not be at the same potential as the
mod's ground. Not sure if it would work but if you disconnect the
ground/return connections and measure the potential difference between them,
it may shed some light (i.e., hook everything up as before but leave pins 21
and 5 unconnected. Measure the voltage between ground on the mod and these
two pins - with and without the 5V supply on.

I did a quick Google. This is a strange write-up but might be useful:
http://www.emuhelp.com/~doejo/PPP.html (scroll about half-way down to see
connection info)

John.

"Philip" <ignore_your_spam@yahoo.co.uk> wrote in message
news:cdbklc$5r3$1@titan.btinternet.com...

John Miller <me@nowhere.com> wrote:

Hmm. What supplies the +5V? The PlayStation or the modulator? If the
former, you'd need to provide your own +5V.

I used a small (300 mA) seperate PSU set on 4.5V but outputing 4.9V
according
to a multimeter - normally the PlayStation provides the power.

Can you share exactly how you wired it up?

Ok - the RF Modulator had a four wire input: Ground, +5v, Video, Audio

"Ground" and "+5v" came from the PSU
Pin 19 of the Scart (CVBS output) was connected to "Video"
Pin 3 (Left Audio) was connected to "Audio"

The two returns for Scart Pins 19 and 3 (ie 21 and 5 iirc) were linked
to Ground too.

Didn't seem to work at all. Even just powering the modulator without
connecting the audio and video signals seemed to severely degrade the
"passed through" aerial connection, making the standard channels very bad.

Phil.