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Moderator-1A2, Cabling
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Moderator-1A2, Cabling
Joined: May 2007
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Originally posted by NWA Telcom:
Turns out the bleed over on the valcom self amplified speakers was caused by the background music option being turned on on the valcm intercom system, and no background music source installed. I turned it off, and no more bleed over.
That's something I should have mentioned. Open inputs look for signal. If they don't have one of their own they'll hunt down someone else's. Good catch. Keep working on the muffling. You'll get it. Sam
"Where are we going and why are we in this hand basket?"
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Joined: Jun 2011
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Originally posted by Jim Baldwin:
Here in California 25volt is required for Schools.(don't want to shock the little bas*****). Here in UK we just use 100V for audio 
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Joined: May 2007
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Moderator-1A2, Cabling
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Moderator-1A2, Cabling
Joined: May 2007
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Originally posted by Owain: Originally posted by Jim Baldwin:
[b] Here in California 25volt is required for Schools.(don't want to shock the little bas*****). Yes, but you also use 240v for "standard" electrical service (which is much better then 120- but tthat's another thread). I did a job for a British Company with offices here in NYC. The PA was spec'd by the home office and the equipment was 100V. Interestingly, the transformers had taps on them for 200V too! Sam
"Where are we going and why are we in this hand basket?"
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Joined: Jun 2011
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Originally posted by Silversam:
I did a job for a British Company with offices here in NYC. The PA was spec'd by the home office and the equipment was 100V. Interestingly, the transformers had taps on them for 200V too!
Sam I've never seen 200V used at the speakers but it's possible the 200V amp output was used for large installations such as Radio Butlins holiday camps, and there was a 200V-100V transformer closer to each speaker cluster or line of 'chalets'. Hi-de-Hi!
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Joined: Sep 2011
Posts: 6
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Originally posted by NWA Telcom:
I recently took on a new job at a school district. On the intercom systems where Valcom is installed, the original installers installed paging in the hallways of the schools using amplifiers wired for 25 volts. Why would anyone do this. I was thinking 7o volts was the normal. The paging sounds muffled at all locations. Also, they used the Aux input of the amp, instead of the telephone input for the Valcom system.
At 1 particular location, they installed a paging amp for one Zone, and self amplified speakers for another zone. I get a call today, and they reported that the zone the amp is on is bleeding onto the zone the self amplified speakers are on, causing the self amplified speakers to be broadcasting outside the school when the page was meant for inside.
When I looked at this I figured you shouldn't mix
self amplified speakers with speakers driven by an amplifier, or this could cause bleed over.
Am I correct, or am I missing something? Also, could the fact that all inside paging only speakers being on a 25 volt system and the amp connect to the aux port cause the muffle sound?
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Joined: Sep 2011
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I came across this site while trying to find someone that could help with my problem. I work for a K-12 school in Cincinnati. Six years ago we constructed a new building and had someone install a Valcom paging system. This was one of those (side jobs) by a cabling guy. Apparently he didn't know what he was doing because it has never worked properly. Every time it rains, the system does not work. It doesn't perform the "all call" function and any announcements made are filled with static. I have had a few companies come in and none have been able to identify the problem. I don't know what to do. We rely heavily on that system. Do any of you know of anyone in the greater Cincinnati area that knows how to work on a Valcom system? We do not have anyone on staff that understands the system. HELP!
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Joined: Jun 2011
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Originally posted by Renn:
Apparently he didn't know what he was doing because it has never worked properly. Every time it rains, the system does not work. well, you've obviously got cabling faults and water ingress. Go right back to the start and sketch out a diagram of every piece of equipment and length of cable. Disconnect every piece of equipment; test amplifiers etc on the test bench, test speakers in situ with a local (battery powered) test amp. Megger every length of cable core-core and core-earth for insulation faults, shorts and open circuits. Then reinstall the workinbg equipments in sections, working to the manufacturer's instructions, testing as you go. https://www.valcom.com/techsupport/knowledge.htm
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Joined: Dec 2002
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Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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