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A short length of screen is connected to mains ground at the panel end, the cores are directly terminated to the PCB connector screw terminal blocks. The two cores that break (or at least that I thought broke) the connection to the sounder itself are connected together in the panel as the...

No, I cut one of the two wires from PCB screw terminal connectors marked "sounder" that led seemingly directly to the sounder module (siren) itself. I spliced either end of the cut wires into 2 cores of the new screened 8 core cable to the panle, and these two wires at the panel end, (in fact...

But the wire I cut to extend back to the alarm panel was one of the two inside the panel from the PCB going to the sounder "siren" itself. Unless there is a hidden wire also feeding the siren / speaker / call it what you will, there's no way it should make a noise. It is like cutting one lead to...

Thanks for all the help, today I replaced the sounder cable with 8 core quality (dense) screened cable and all is well, hopefully it stays that way! One query though, having 8 cores I cut the wire to the sounder module itself in the sounder box. the sounder module had two wires to it, red an...

Update: I have isolated the sounder as above, it does not chirp unless connected to the panel. Fitting the big clamp on RF ferrite from my TS-590 transceiver power supply cable (original Kenwood ferrite, but the transceiver is not used for low frequency TX), to the sounder box multi core...

But which wires supply the hold off voltage please, at the panel? I am not understanding the sounder hold off circuit I think....

There may be a fault or maybe I am misunderstanding, but when I disconnect all the above, and disconnect the panel from the mains, and from its internal 12V battery, the sounder sounds constantly. Do I need to supply a voltage to the Trigger -ve wire to the bell box as well? What I may end up...

Could you go into a bit more detail please? Which bell cable do I need to remove at the panel end? Do I leave the sounder battery still connected in the sounder box? Thanks, sorry to be a bit thick, alarms are a bit of a mystery, although I have some electronic knowledge. I do not have circuit...

Tried bypass caps on the panel terminals, no change, was thinking what if I power the -ve hold off terminal wire in the panel permanently off 12V neg and see if it still chirps? If so it would suggest RF into the panel to bell box cable, or into box itself? I take it hold off is usually just a...

Otherwise 100% (if elderly) Optima XM6 panel with good battery, and Pyronix "Belle" outside sounder, alo with a good back up battery. I am a radio ham and when I transmit on 136kHz (yes, kHz LF) it will make the outside sounder squawk very briefly and intermittently every few minutes. The two...

I need to run mains single phase power to some new land we have bought, a distance of about 150 metres from my workshop with a decent mains power feed into it. I want to use 3 core armoured and bury it. I need to run a normal 13 amp socket at the field end. What size cable do I need, and is it...