1)  What is the maximum recommended distance between intercoms?

1000 feet

2)  What type of audio cable should be used?

18 AWG, 2 conductor (depending on the intercom), twisted and shielded audio cable.

3)  How can noise be eliminated from the system?

Ground one side of the shielding from the twisted shielded cable.

4)  How can feedback be eliminated?

It is recommended that the intercoms be install a minimum of 30 feet apart in an unobstructed line of sight installation.  The speaker/microphones should not be facing each other in a line of sight installation.

5)  How are the power and audio line connected to the intercom?

See Instruction and Service Manual, available in the Library.