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Joined: Jun 2011
Posts: 82
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Joined: Jun 2011
Posts: 82 |
1000 ft / 300 metres is nothing for audio over twisted pair. Broadcast studio to transmitter links would do 100+miles.
But you do need proper transformers/matching at both ends. I wouldn't trust a Pana phone system (good though they undoubtedly are) to have an audio line output capable of driving a long line.
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Joined: Feb 2006
Posts: 1,716
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Joined: Feb 2006
Posts: 1,716 |
Normal twisted pair telephone cable is unbalanced with the nominal impedance of a twisted pair of 24 gauge copper wire being 100 ohms. The normal audio output of most telephone systems is 600 ohms. Normally, within a few feet, this is not an issue. However, in 1,000 feet, the noise impressed on the unbalanced pair and the mismatched impedance will degrade the audio quality.
The general rule of thumb is to use a shielded, twisted pair cable with the shield grounded ONLY one one end for long audio runs. If you have a good level (0db or better) I would use matching transformers. The loss through the match would be negligible but the elimination of distortion would be enhanced.
Rcaman
Americom, Inc.
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