Remove the coil from the former and slide onto the acrylic and secure with two bolts.

See photo for method I used to attach to the case

Recommended to mount the coil in the case close to the rotary 12 way switch to minimise

the connecting wire length. Also use heavy 1.5mm insulated wire.

The variable capacitor needs to be insulated from the case and the shaft fitted with an insulated extension. Plastic tubing can be used and a cut- off piece from the plastic shaft of a switch or variable resistor. A piece of acrylic (Perspex) can be inserted under the variable capacitor and the acrylic attached to the case with short standoff mounts

This is so you can bolt the variable capacitor to the acrylic without the mounting bolts touching the case . Remember to make the acrylic long enough to take the capacitor mounting hardware and standoff mounts to the casing.

As can be seen from the photos I used an alternative method of winding the toroid.

I used 20 turns of 0.5mm (24swg)enamelled copper wire which are spaced evenly around the toroid. The centre primary winding consists of a short piece of RG58 coax passing through the toroid with the centre conductor only connected.

This is a pain if you do not have a chassis punch or Nibbler, I Scribed a 50mm circle (the size of my meter )on the face plate and drilled a circle of 2mm and then enlarged to 3mm holes ,a cold chisel was used to join two of the hole and the rest cut out with a mini hacksaw. File to a nice smooth round 50mm hole, make a template for the four meter mounting holes and transfer to the faceplate punch and drill. Take care with this as you want your meter to be square with the edges of your box.

How to Operate your Ground Tuner (with input from the MFJ-931 manual)

Connect your transmitters Earth (or Ground) post to the binding post of the Ground tuner marked Input from TX Chassis (Earth).

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