| Re: 1800 Foot cable run [message #322349 is a reply to message #322339 ] |
Tue, 13 May 2008 11:41   |
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 Andre Vare
Messages: 59
Registered: May 2004
Location: Hamilton ON Canada |
Should Get Out More |
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| Tim McCulloch wrote on Tue, 13 May 2008 11:45 |
Thanks for the ClearCom info. I know it's unbalanced and I'm pretty sure that 1000' was pushing the limit, but not sure by how much... I'd not risk it again without the blessing of ClearCom.
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From H a n d b o o k o f I n t e r c o m S y s t em s E n g i n e e r i n g:
| Quote: |
Intercom systems such as the TW System, in the standard, unbalanced configuration have
been operated at distances of up to two miles with acceptable system noise levels. Routing
the intercom cables along the same ductways and pathways as the main power cabling can
increase the noise and hum levels in the system.
If intercom cables have to be routed in this manner at distances over 300 meters (1,000 ft.),
a balanced conversion should be made.
Alternatively, the entire system can be operated in an optional balanced mode and be
powered at each station with the “local power” option. This is sometimes called “dry line,
balanced” operation.
Extended Range On Part Or All Of The System
If a station is locally powered, operational range can be extended up to five miles, using
two transformers to step up the line impedance to 800 ohms (for lower losses). When the
users station has the four wire / 800 ohm option installed, operation is possible up to 20
miles along Telco dry pairs. Operation over longer distances (3000 miles) is possible using
dial up or minimum loss dry lines and the TW series of interfaces
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Andre
[Updated on: Tue, 13 May 2008 11:42]
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| Re: 1800 Foot cable run [message #322351 is a reply to message #322349 ] |
Tue, 13 May 2008 11:45 |
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Mac Kerr
Messages: 6008
Registered: April 2004
Location: Westchester County, NY |
Has No Life |
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| Andre Vare wrote on Tue, 13 May 2008 12:41 |
| Tim McCulloch wrote on Tue, 13 May 2008 11:45 |
Thanks for the ClearCom info. I know it's unbalanced and I'm pretty sure that 1000' was pushing the limit, but not sure by how much... I'd not risk it again without the blessing of ClearCom.
|
From H a n d b o o k o f I n t e r c o m S y s t em s E n g i n e e r i n g:
| Quote: |
Intercom systems such as the TW System, in the standard, unbalanced configuration have
been operated at distances of up to two miles with acceptable system noise levels. Routing
the intercom cables along the same ductways and pathways as the main power cabling can
increase the noise and hum levels in the system.
If intercom cables have to be routed in this manner at distances over 300 meters (1,000 ft.),
a balanced conversion should be made.
Alternatively, the entire system can be operated in an optional balanced mode and be
powered at each station with the “local power” option. This is sometimes called “dry line,
balanced” operation.
Extended Range On Part Or All Of The System
If a station is locally powered, operational range can be extended up to five miles, using
two transformers to step up the line impedance to 800 ohms (for lower losses). When the
users station has the four wire / 800 ohm option installed, operation is possible up to 20
miles along Telco dry pairs. Operation over longer distances (3000 miles) is possible using
dial up or minimum loss dry lines and the TW series of interfaces
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Andre
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This is certainly possible, but the original question was about running balanced audio over this distance, there would be little point in converting to Clear Com at each end to then run the balanced audio you wanted in the first place.
Mac
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| Re: 1800 Foot cable run [message #322526 is a reply to message #321677 ] |
Tue, 13 May 2008 21:13 |
doug johnson
Messages: 341
Registered: July 2004
Location: central va |
Has No Life |
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I have been doing fireworks shows for years, two or three times a year. It is always a Cd with music on one channel and atimecode on the other. The pyro tech gets time code only and it has always been wireless. Most times it is a marti system, a few times it has been other types (always supplied by pyro company). I can't recall any shows where the techs have not used Dave Clark phones.
Doug J.
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