Hence the decision to build a RF milliammeter on the same lines as my homebrew RF ammeter.
|RF Milliammeter - Schematic|
All parts were sourced from the junkbox. BNC sockets were used. The primary of the toroidal transformer is a piece of the inner conductor of RG-58/U coax. The secondary is wound with a length of solid hookup wire. A rubber grommet ensures positioning of the toroid.
|Inside the RF Milliammeter|
The small 1kΩ, 200μA FSD meter makes the unit quite compact. The enclosure of a defective 230V - 110V autotransformer came in handy, with the meter taking the place of the 110V socket.
|Front view of the RF Milliammeter|