Hi Group,

I picked up a surplus Radio Shack 43-218A wireless intercom. A search on the
site says they are either on 200KHz, 230KHz or 270KHz depends on the switch
setting A,B, or C.

I am considering modifing them so that I can put the HF rig audio into one of
the them and be able to listen to the rig while in other areas of the house.
Has anyone done this? Comments?

I would also like to understand how the 200KHz is inserted on to the power
line, does anyone have a schematic of these or similar units?

Tnx de KJ4UO