Is anyone else using a Quad Radio PCI Card with a pair of Icom IC-F221s configured as a repeater?

I've worked my way through the need for a COS pull-up resistor, but I can't seem to get the audio right. After setting proper deviation, I hear what sounds like a lot of computer-generated hash on the transmitter and a 'ghost' signal from a local commercial broadcast station in the background.  I suspect that one of my problems is not using shielded cable from the Quad Card to the ICOMs. I could not find the appropriate shielded cable locally, so I had hoped to get by by sacrificing an old twisted-pair jumper. I crimped on a new RJ-45 with the following pin-outs:

ICOM Receiver Discriminator Audio (330 mVRMS @ 100 k ohms --> Pin 1Quad Radio RJ-45
ICOM Tramsmitter (Radio Modulation IN) (330mV RMS) --> Pin 7 Quad Radio RJ-45 

ICOM PTT -->  Pin 5 Quad Radio RJ-45

ICOM COS  (when radio is properly programmed and a pull-up resistor is used) --> Pin 2 Quad Radio RJ-45

ICOM Ground --> Pin 8 RJ-45

RX de-emphasis jumper is enabled and the best results seem to be obtained with TX pre-emphasis enabled (even though it is not recommended).

I will be ordering shielded cable for RJ-45s Monday, but is there anything else I have missed?

Thanks for any suggestions.

John / WB5NFC