I am hoping someone might have come across this one before or perhaps have some further ideas I could try.
Original installation was a Ness R8 with several radio PIR's. Worked perfectly for several years (except for some PIR flat batteries which forum members kindly helped to solve - thank you).
Installed a Futuro video intercom bit over a year ago - in close proximity. It is a 12v wired system (and coax). By necessity, the Futuro wires all run in the same conduit as the power wires for the ness R8 for the last 1.4m in the wall. No problem - all worked just fine.
Fast forward to the recent set of big storms we had in Sydney (several weeks ago). We had several near strikes (I can attest from brown undies!) - which took out most things on the front circuit closest to the main board - a TV, modem, and the Futuro was damaged but semi operational (audio only). (as an aside - now have a surge protector on the main board).
Accordingly, I replaced the Futuro - simple unplug and plug new unit in.
Subsequently I started getting random PIR signal loss indications from the Ness R8.......and the stupid 8 beeps that go with it ..... sometimes at 2am.
Action - checked the Futuro wiring. I reground the coax for the video at both ends - the power to the camera and the audio run in 4 wire shielded. Reground this at the intercom end (including the drain wire). Still random indications signal loss from the PIR's - maybe 3 to 4 events a day. Changed batteries in all PIR's (checked voltage old and new and all was still perfect - but put new in anyway).
Video intercom works fine. Crystal clear!
Contacted Ness and explained the situation - they suggested that the R8 might be having a few problems. So bought an R16 and plugged it in with a couple of Lux PIR's as well. Looking good!
Had a bit of trouble getting the PIR's to register - had a moment of clarity and disconnected the intercom. PIR's registered and did signal tests for all - all in the 8 and 9 range. I have the external antenna for the R16 connected.
Apply power to the video intercom - signals drop to 4/5. When apply the video "on" function - signal lost from the PIR's. Kind of understand what is happening now - as the video is movement activated and recorded in the system - so even if activated at 2am by a cat or something - video will be "on" and record (but monitor stays black). Obviously narrowed down to RF interference from the intercom. However - pre-storm there were no problems with the old intercom unit or the Ness R8.
One of the few things I have not tried is changing the 12v power pack to the intercom - could they create the RF from storm damage?
Otherwise I am running out of ideas that do not involve moving one of the systems - and a bit plastering and painting........really want to stay away from that if I can!
Any further ideas I could try?