Eggy Posted March 26, 2007 Share Posted March 26, 2007 I'm having grief with a wireless PA only system that is going in at the moment: It's a 6 storie apartment block of concrete construction (five floors including ground plus a basement car park). There are 13 flats each to have a portable PA button. I'm using a 768r controller with two 769r expanders. These, in turn are signalling a Castle Euro-1 plus with a plugged on BluStu. Now, it's a big site, so I put on a 1/2 wave antenna. Here's the problem. At first, I sited the controls and antenna on the ground floor. This gave me good signal from the Txs on all floors up to and including the 2nd. Basically, floors 3 and 4 weren't having it. So, I re-sited the antenna to the 3rd floor. Still no joy on the 3rd and 4th, although all other floors were ok - even the basement. Re-sited to 4th, and even the roof, still the same situation. It seems that I get good Tx/Rx in all areas except 3rd and 4th regardless of antenna position. In some cases - the 1/2 wave antenna won't pick up a PA pressed 5m away, but will get one 100m away. Called Scantronic, who were as much use as a trapdoor in a canoe (and close for lunch now). Went back with a 706 test meter (or whatever it's called). Good tx/rx in most locations (up to 9 bars) except floors 3 and 4, where I get around 3 or 4 bars. Turned it to background interference check - I regularly get 1 or 2 bars of interference, with it spiking up to 9 a couple of times per minute. There's no indication what this might be, and I get it outside (outdoors) too. Need help. And "You shouldn't have used Scantronic because it's ****" is not help. I know all that. Link to comment Share on other sites More sharing options...
Guest anguscanplay Posted March 26, 2007 Share Posted March 26, 2007 what would happen if you put an expander high on floor two and low on floor five with there own arials only used to risco radio so dont know if the arials fit direct to the expanders like it would on risco but just a thought angus Link to comment Share on other sites More sharing options...
Darren Cooper Posted March 27, 2007 Share Posted March 27, 2007 Eggy Please contact me when you can i will arrange for this to be sorted. my number is on our website www.coopersecurity.co.uk Darren Cooper The views above are mine and NOT those of my employer. Link to comment Share on other sites More sharing options...
Guest Posted March 27, 2007 Share Posted March 27, 2007 Maybe ground based radar locally, especially given the fact you say the interference peeks a couple of times a minute. Link to comment Share on other sites More sharing options...
Guest anguscanplay Posted March 27, 2007 Share Posted March 27, 2007 EggyPlease contact me when you can i will arrange for this to be sorted. my number is on our website www.coopersecurity.co.uk Darren Cooper why what do you obviously know that your not telling the public yet Link to comment Share on other sites More sharing options...
Cubit Posted March 27, 2007 Share Posted March 27, 2007 Maybe ground based radar locally, especially given the fact you say the interference peeks a couple of times a minute. Can never discount anything without physically checking but i doubt it is radar. 2 spikes a minute is very unlikely to be radar. If it was, you'd have it on all floors. Obviously some transmission or other is occuring and seems very directional. I'd be looking for comms dishes - light of sight transmission stuff. Link to comment Share on other sites More sharing options...
Cubit Posted March 27, 2007 Share Posted March 27, 2007 why what do you obviously know that your not telling the public yet Hmmm. Interesting point. Link to comment Share on other sites More sharing options...
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