|
|
|
|
Joined: Jun 2011
Posts: 82
Member
|
Member
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.
|
|
|
Visit Atcom to get started with your new business VoIP phone system ASAP
Turn up is quick, painless, and can often be done same day.
Let us show you how to do VoIP right, resulting in crystal clear call quality and easy-to-use features that make everyone happy!
Proudly serving Canada from coast to coast.
|
|
|
|
Joined: Feb 2006
Posts: 1,716
Member
|
|
Member
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.
Where The Art And Science Of Communications Meet
|
|
|
|
Forums84
Topics94,290
Posts638,803
Members49,767
| |
Most Online5,661
May 23rd, 2018
|
|
|
2 members (Toner, KRRath),
131
guests, and
413
robots. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
|
|
|
