On 10/15/03 08:32, Richk05 said...
I am planning on adding IR control to an exiting
system.
For our exiting systems we usually just use a door on regular hinges, and a regulation door-type knob. Sometimes a screen door and a closer, too.
I read somewhere
that the IR can not be addded to coax that is
carrying satellite signals because the sat signal
already has DC present on the line.
The guys at Xantech (the old tech crew who were there before the newer more recent corporate buy-out; all the old phone guys are gone) told me NO.
Think of it this way -- if you have 13 or 18 volts DC on the line, how can you add pulsing 5 volts DC?
You could conceivably do it IF all your IR signals were modulated at ONE particular frequency AND you wanted to invest the money in a circuit at the unjecting end (I LIKE that word!) consisting of a really good narrow-band amplified filter followed by a circuit that would restore the square-wavish look of the modulated signal...in other words, it would cost too much.
I do installations for a living, but in your case I would go to Radio Shack and get their latest version of the PowerMid.