If your TV/Monitor can remember the channel or video input to which it was tuned prior to power cutoff, and return to that channel or video input after power is restored (and assuming that it also can remember that it was on, and come back turned on when power is restored), you can build an add-on to your Tivax STB-T9 that will eliminate the need to keep the TV's remote around just to turn it on and off. With this add-on, changing the box from standby to on, and later back to standby, will also turn on and off the connected TV. As an added benefit, you'll waste less power because the TV will be completely powered down instead of just in standby watching for a signal from its remote.
This project relies on the presence of a switched 12 volt DC supply and ground on two pins of the 6-pin "Smart Antenna" connector. You'll need to connect the project to the Tivax box with a 6-conductor RJ-12 modular cord (e.g. Radio Shack #279-422), and you'll need to modify the RJ-12 plug slightly to get it to fit the jack; this involves lightly filing the right side of the plug's locking tab (tab facing up) until the tab just clears the offset slot on the Tivax connector. If you take your time and do this carefully, the plug will seat all the way in and fit snugly. You must use a 6-conductor cord, not one with only 2 or 4 conductors as is common among RJ-11 telephone cords.
Pin 1 (the rightmost pin) is ground and pin 2 (the next pin to the left) is the switched 12V. The project otherwise requires only a relay (Radio Shack #275-248 or similar - I chose this one because it can handle 10A@120VAC while only requiring 30ma. from the Tivax unit, which it seems to have no trouble supplying), a standard 2-prong AC power plug, a standard 2-prong AC power socket, wire and solder to put it all together, and some way to safely house the project.
Connect the wire from pin 1 of the modified RJ-12 plug to one of the relay's "coil" contacts, and the wire from pin 2 of the modified RJ-12 plug to the other of the relay's "coil" contacts. Connect the neutral (wider) AC plug blade directly to the neutral (wider) AC socket blade. Connect the hot (narrower) AC plug blade to the relay's normally open (NO) contact. Connect the hot (narrower) AC socket blade to the relay's common (COM) contact. You're done. Plug the modified RJ-12 plug into the Tivax "Smart Antenna" connector. Plug your TV/Monitor into the AC power socket, and plug the AC power plug into the wall. When you turn on the Tivax box, the 12V power actuates the relay and switches on your TV; when you turn off the Tivax box (put it in standby), several seconds later the 12V power disappears, the relay opens, and the TV turns off.
The challange, should you choose to attempt this, is to build this neatly and safely. Recall that you are fooling around with AC line voltage (120VAC) that could injure or kill someone or start a fire if this project is constructed sloppily; and that the 12 volt control voltage from the Tivax box must not be short circuited nor ever allowed to contact the high voltage portions of this circuit. Also beware that if you plan to use the plugs on both ends of the 6-conductor modular cord, these are sometimes wired in a criss-cross fashion such that pins 1 and 2 on one plug end up on pins 6 and 5 at the plug on the other end of the cord; always ring out or trace the cable to see where Tivax-end pins 1 and 2 end up at the project end of the wire, preferrably using a meter to check for the switched DC voltage.
Because I hate fooling around with AC cords and outlets, I built mine into a defunct X10 appliance module, retaining only the built-in plug and outlet (both of which are very sturdy and well-made), snipping out all the remaining parts on the circuit board, then gluing the relay upside down on the board near where the X10 relay was removed. The resulting unit is shown in the attached photo (were it not for the RJ-12 jack on the side, it would look just like it originally did.) Obviously there are many other ways to approach this, the simplest being basically an extension cord with a plastic box (containing the relay) in the middle and the control cable also emerging from that box.
Good luck and happy solderingUPDATE 6/25/2008 - See post #216 ( http://www.avsforum.com/avs-vb/showt...6#post14160716 ) for a potential simplification (untested, but based on the Tivax schematic) to interfacing with the Smart Antenna connector.UPDATE 7/1/2008 - Also see post #216 for a recommendation to add a protective diode to the relay coil circuit.