Ramsey Electronics Treasure finder TF-1 Instruction Manual page 16

3. With the PVC pushed together, slip the mini coaxial cable through the
coil wire hole, as shown, and feed the wire through until it falls through
the coil mounting slot. Be sure to leave yourself at least 6 inches of extra
wire at each opening for final assembly.
Next we'll prepare the ends of the coaxial cable for final assembly. Usually a
good sharp knife or razor cutter does a good job at removing the outer
insulation. Use caution as not to cut too deeply into the "braid" of the coax.
Note also that each end of the cable will be prepared slightly differently;
follow the drawing for the correct end types.
4. Prepare each end of the RG-174 mini coax as shown. One end needs
to have the shield wires pulled out away from the inner shield and center
conductor so that it can be soldered to the search coil ground. You will
want to "tin" the loose wires of the outer braid and center conductors to
avoid frayed wire ends. Use caution not to overheat the braid or center
conductor wires as this may cause the insulation to melt. Use quick,
definite movements with your soldering iron to avoid overheating the
wires.
5. Now on to mounting the coax to the search coil. First we need to
finalize the assembly of the coil by "crimping" both open ends of the
copper tubing so that the coil will fit into the slots cut in the PVC tubing.
Use pliers to gently form the end of the copper tubing at the proper
angle (notice that this will determine the angle at which the search coil
will affix to the slot). A good "rule of thumb" is to leave the coil on a
horizontal surface and crimp slightly off perpendicular to the table top.
6. The next task is to remove the enamel from the ends of the coil wire.
You may scrape the enamel off with your hobby knife, or gently sand off
the enamel with a piece of fine sandpaper. "Tin" the ends of the
Cable Preparation
Coil Connection End
Cable Preparation
PC Board End
TF1 • 16