Hi guy' iam trying to make a mini transmitter that can fit in side a tv coax plug it does not need to transmitter far only about 8ft and transmit on 120khz, or 457khz,
any help would be very much appreciated,
Obviously not small enough as you indicated, just googling around the net.
If you want to build such a device, it would help us to know your current level of electronic experience, since building a reliable and (in your case) very small xmitter 0f this sort could be difficult.