Wiring

Is it possible to extend the "link cable" (cable between sender unit and display unit)?

For memo, the cable provided is 1.8m (6 feet) long.

A reasonable (a few meters/yards maximum) cable extention is OK.

The cable should be made of 2 conductors (for power + data) + 1 shield (for ground).

This is how analog stereo audio cables are make (just replace power and data by left channel and right channels).

The connector on the display unit is a standard 3.5mm diameter (sometimes called 1/8 inch) stereo audio connector (this type of connector is used on most stereo headset).

Gold plated connectors are always preferred.

Here is an example of extension cable that can be used:

http://www.radioshack.com/product/index.jsp?productId=2103868&retainProdsInSession=1

(P/N = 2103868)