I used one twisted pair in un-shielded CAT 5 in my Fire Dept to connect
a radio to an audio amplifier system.
The run was over 100 ft. The audio was tapped at the internal speaker of
the radio at a comfortable listening level.
The other end of the wire went into the aux audio input of a audio
amplifier,
padded down with a 10:1 resistor voltage divider at the input of the amp.
I used 1K in series and 100 ohm resistor to ground to give me 1/10th the
original level to the input of the amp.
The voltage divider will also reduce any common mode or differential
mode induced noise on the wire by a factor of 10.
Being twisted pair that noise should be already low.
The amp is feeding 5 speakers all over the building. The run from the
amp to the speakers is all using the 70V output of the amp,
and there is 70V transformers at each speaker, all Radio Shack vintage.
No Hum or RFI in this system that way, and very cheap setup.
I believe the audio transformers are blocking any RFI.
N3FLR - Frank
On 2/27/2010 11:16 PM, larynl2 wrote:
Shielding is not usually necessary for line level balanced pair audio on CAT 5
or any good twisted pair. CAT 5 is often used in broadcast audio work.
Laryn K8TVZ
--- In [email protected], "skipp025"<skipp...@...> wrote:
Joe<k1ike_mail@> wrote:
I wonder if CAT 6 would be better than CAT5 due to the
difference in twist?
Joe
A number of different items in the specifications would be
worth examining... like how much C per foot and I don't
believe "CAT" network cables are shielded.
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