Intercom interference

[highspark]

Hi,

I have just rewired intercoms on a block of flats. When you pick the handsets up you can hear the calling tone ever so slightly in the background. The call buttons are not being pressed it's just a constant tone.

spoke to manufacturer and technician says this is normal?

Tenants te saying this was not the case before the rewire.

is there any reason and solution for this?

 

[highspark]

Tell you how it came about....two parts to the building. 1 call point per side. Swopped Amps around. No bleeding when swopped. But bleeding on opposite one now!

fault isolated at Amp.

Opened it up and noticed slight condensation on circuit board.

Took it home at break got the birds hair dryer out.Banged it back in. Clear as glass.

 

[tazz]

Well at least you got it sorted, if you use twisted pair on next job, you will hear the difference in the speech quality.

 

[telectrix]

for what it costs, cat5 is a good option.

 

[Guest111]

for what it costs, cat5 is a good option.

aye just avoid that CCA garbage.