Siren sounder wire length

[fourbie]

The supplied red and black flex suggests the sounder has a polarity? If so, have you followed this?

Do the instructions make any reference to maximum cable length or a requirement for screened cable? The supplied cable length could be very telling or just suggest the manufacturer is saving a few pence...

If it is a cheap alarm, perhaps it is just a design feature. If this is the case, it could probably be engineered out but maybe you're best off purchasing a system you've used before?

Yes I observed the polarity but with no sounder on the end it seems not to matter.
Nothing is said about cable length, in fact precious little is said about connectivity though the instructions are very good regarding programming so I would rate the instructions generally as very effective.

 

[fourbie]

A little update - seems like success.
I bought 50m of fig 8 twin core individually screened cable - not bad for a tenner! It came today. Any surplus I can use single on electronics because being fig 8 it can be separated or twin for speakers etc.
I connected one end to the host and nothing to the other end..........so that is a 50m run!! I twisted the two screens together at each end and left it floating - did not earth it. Later I was tempted to use the screens as one conductor or even split the cable into single screened but thought against it. If it ain't broke don't fix it!
Perfect, no buzz.
I then connected the siren to the free end (+ve and -ve polarity conscious) and again, perfect, no buzz and fully functional.
I only need to use an actual run of about 10m!
This is the only time that connecting any longer lead to the host has worked silently. I shall report back once the job is complete.

 

[fourbie]

Final update. Perfect.