A reason why DVD players don't have RF modulators

[Kevin Kuehn]

Originally Posted by wa2ise

One last tweak: Had to tune the modulator's 4.5MHz FM sound subcarrier frequency. It was a little off, which caused visible beats with the chroma subcarrier (I made it switchable: color or B&W). Now it works well. Looks like the best improvemsnts came from using a dedicated voltage regulator, tuning the subcarrier, using well shielded audio and video lines.

Can you elaborate on how you made it switchable: color or B&W?

[Electronic M]

Originally Posted by Kevin Kuehn

Can you elaborate on how you made it switchable: color or B&W?

He probably mixes the two S-video lines and has a switch in the color line to disconnect it....Many here have been getting pure monochrome by disconnecting the chroma line on S-video connectors.

[wa2ise]

Originally Posted by Electronic M

He probably mixes the two S-video lines and has a switch in the color line to disconnect it.

That's essentially it, though here I created a low pass luma filter, a bandpass chroma filter and merged these to create a composite video signal that would look good on older color TV sets (the one that use a notch filter). I switch that and an unfiltered luma only signal.

[Kevin Kuehn]

Thanks for sharing this. And what type of rf modulator are you using that runs on 5 volts?

[Findm-Keepm]

Originally Posted by Kevin Kuehn

Thanks for sharing this. And what type of rf modulator are you using that runs on 5 volts?

I dunno, so I asked Google:

http://www.talonix.com/shop/item.aspx?itemid=10044

2 bucks.

[Kevin Kuehn]

Hey, those are cute.

[Findm-Keepm]

Originally Posted by Kevin Kuehn

Hey, those are cute.

Naw, these are cute - and small - looks to be matchbox sized, and also 2 bux.

http://www.talonix.com/shop/item.aspx?itemid=10045