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Joined: Nov 2006
Posts: 179
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OP
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Joined: Nov 2006
Posts: 179 |
Just installed a new valcom paging system in a school. We are using a V-2924A with a V-2925 Expansion unit. All wiring is new and each speaker in wired individually except for the common areas (Hallways, lunchroom, etc.) Pages work fine but we get a constant hum on the speakers. It appears to be a power problem-if we disconnect the talk pair the hum persists. Anyone have any ideas?
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Joined: Sep 2005
Posts: 9,285 Likes: 6
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Admin
Joined: Sep 2005
Posts: 9,285 Likes: 6 |
Are you using a common power supply or separate transformers? It sounds like you have a ground loop being caused by to many grounds.
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Joined: Nov 2006
Posts: 179
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OP
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Joined: Nov 2006
Posts: 179 |
We are using a single VP-4124 at one site and 2 VP4124 at another site and we have identical problems at each.
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Joined: May 2002
Posts: 17,722 Likes: 18
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Joined: May 2002
Posts: 17,722 Likes: 18 |
Miswired? How high do you have the volume turned up?
Retired phone dude
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Joined: Dec 2005
Posts: 7,056
RIP Moderator-Mitel, Panasonic
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RIP Moderator-Mitel, Panasonic
Joined: Dec 2005
Posts: 7,056 |
Possibly the common wire for the speech path is bare and touching building steel or conduit. Try disconnecting all speaker runs at the Valcom and reconnecting one at a time. This will backfeed to ALL speech paths! And please don't tell us you used 'signal cable', doorbell wire, or some other type of non-telco wire, rather than cat3.
When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
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Joined: Dec 2002
Posts: 9,423 Likes: 1
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Joined: Dec 2002
Posts: 9,423 Likes: 1 |
I'd call Valcom and see what they have to recommend. I was at a training seminar today and their support is really top notch.
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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Joined: Nov 2006
Posts: 179
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OP
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Joined: Nov 2006
Posts: 179 |
All runs are Cat 3 and the volume is turned almost all the way down.
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Joined: Dec 2005
Posts: 7,056
RIP Moderator-Mitel, Panasonic
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RIP Moderator-Mitel, Panasonic
Joined: Dec 2005
Posts: 7,056 |
Doesn't the 2924 have a BGM function? If you are not using BGM, turn it off AND short the the input.
When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
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