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I am repairing a Goldmaster II. Its feedline consisted of shielded twin lead rather than another I have that has coax cable. In this one, the feed line had damage to the outer plastic sheath which then allowed moisture into the shield and destroyed it. I started tracing back this damage in the shield and it is extensive so I need to replace the whole feed line. I cut a hole on the coil bottom and have good access to the coil connections. Can the TX and RX share the same ground shield - I was thinking of using a USB2.0 cable with two twisted pairs - each pair tied together and then they both share a common ground inside the coil. Or do I look for something like a stereo mic cable with individual shielded lines - (RX ground connects to the electrostatic shield)? Or thinking more about it, should I use two USB cables - one for TX one for RX? They are fairly thin but not as thin as the twin lead feed line was.
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So I wonder if someone has any reference materials in regards to coil feedlines? There just isn't much here to search on. I have two GMII's - one has a 2 conductor each sheilded single cable, the other has something like audio cable twinlead. Coils themselves look identical. I went to a local electronics store and struck out trying to find a single shiethed two conductor each shielded cable. Could use two single cables... or... audio twinlead cable (like you commonly see to RCA phone plugs). I also have access to several types of external storage cables - USB2.0/3.0, firewire 400/800, SATA... I suppose the USB3.0 cable would be cool for RX but I'm wondering if more wire thickness would be appreciated for TX. Also, what are the risks of the coil detecting the feedline itself? Are there certain cable materials to avoid for this? Maybe I made a mistake calling out the GMII - this should be of interest to more than just GMII owners...
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