This should work fine, though I would suggest you use Cat5e or Cat6. Not
because of frequency, but capacitance.
Also, you may need to beef up your transceiver circuit to increase it's
power output some (ie a bigger transistor with a heatsink)

Otherwise, I have seen many customers with long serial runs in noisy
(machine shop) environments. And we have also run Ethernet in these
environments to just about the full 100m limit with plain Cat5 with no
problems. Make sure you use good cable, ground your shield, and check
your jacket rating. for example, if you run through walls or floors, you
MUST use plenum rated cable.  If this is outdoors, use appropriate cable.



  ----- Original Message -----
  From: "Hasan Khan"
  To: "PIC List"
  Subject: [EE] Transmission on twisted pair
  Date: Fri, 1 Dec 2006 10:02:01 -0800 (PST)


  Hi,
  I need to transmit a digital signal over a distance of about 150ft.
  I did some research on google and I am thinking of transmitting
  the signal over RS485 twisted pair standard. The signal will be
  digitized audio done by a PIC. Supposing audio ranges from 20Hz to
  4KHz, and sampling at 8KHz, RS485 should be able to handle the
  bandwidth easily.

  My questions, first, is there anything fundamentally wrong with
  this approach? Second, will RS485 work reliably without loss of
  data over 150ft of twisted pair?

  Thanks.



  -Hasan Khan


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