How to Build an ATS GeoSuite Cable

An ATS GeoSuite cable has been designed to be very simple to construct. Only off the shelf components are required to build the cable that should be accessible at any electrons store.

You will need the following parts to construct a cable :

• An off-the-shelf 4 pole audio cable. This cable should be at least 1.5 meters long.
• A 100k Ohm 0.1% resistor. The resistor must be as close to 100K Ohm as possible.
• A 2k Ohm 0.1% resistor. The resistor must be as close to 2K Ohm as possible.
• A large red crocodile clamp. This should be large enough to fit over a nine inch nail head.
• A large black crocodile clamp. This should be large enough to fit over a nine inch nail head.
• Some heat shrinkable insulation. A suitable size to slide over both the resistor and cable is required.
• A soldering iron
• Some solder

That's it...

The off-the-shelf cables usually come in lengths of 1.5 meters and have RCA plugs as connectors. These RCA plugs can be cut off the cable to connect the resistors and clamps.

The resistor color codes are shown below. They usually are blue in color to indicate a 1% tolerance rating.

NOTE :

It is very important to note that when choosing the resistors they must be within 0.1% of the stated ohm value at a temperature of 25 degrees Celsius. This means the 2K Ohm resistor must have a value of 2000 Ohm +- 2 Ohm and the 100K Ohm resistor must have a value of 100000 Ohm +- 100 Ohm. The closer the resistors ohm value is to the stated value, the better.

The clamps used are readily available off-the-shelf items. They usually come in black and red pairs.

Build the cable using the following wiring diagram as a guide.

Take care to make sure that the two resistors are housed within the red crocodile clip sheath. This will provide some mechanical protection to the resistors. The two resistors should be completely housed inside a heat shrink insulator to prevent shorting with the crocodile clamp.

The final cable might look something like this