On Mon Jan  1 18:10:53 2018, Isaac M. Bavaresco wrote:
>
> Splitting the cable and separating the wires will increase the
> impedance of the one wire that is not together with the ground wire.

There was (maybe still is) a commercial solution -- ribbon cable
with a 1 to 2 inch long flat section every 18 inches (maybe 12 in,
it's been a long time) for IDC connectors.  Between flats, each
pair was seperate & twisted as interfaces using ribbon cables
usually alternated signal wires with ground wires.  Twisted pair
ribbon cable was much more expensive & was highly constrained in
how close you could adjacent IDC connectors.


> It would be good if each signal wire had its own ground return wire.

I've made my own ICD to PIC target cables using unshielded twisted
pair (UTP) wire.  Each of PGC and PGD signal wires have a ground
wire twisted around it; ground is only connected at one end.  Keep
cable as short as possible.  I haven't had crosstalk problems.

						Lee Jones


Em 01/01/2018 21:12, Allen Mulvey escreveu:
>
>> Back in the olden days...
>> We had flat cables on hard drives, floppies, and a number of other
>> devices. Sometimes we would take a knife and split the flat cable
>> between the suspect pairs. This would often solve problems like
>> this. It doesn't cost anything to give it a try.
>>
>> Allen
>>
>> -----Original Message-----
>>
>> The standard Microchip cable unfortunately puts PGD and PGC on
>> adjacent lines.  Since this is a flat cable, this can and does
>> lead to crosstalk between the two in some cases.

--=20
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