Remenber:
Any Wire, any lenght acts as an Antenna.
Long wire = more "noise" received.
Short the noise on the "Wire-Antenna" with Ferrite.
I use 30m cat-5 shielded cable without problems.
The Cobber Bar to secure good connections from the ground on the PCB to the Shield on the Cable.
/richo
daher fragen will ist wie hast du die Flachbandkabel am Ende (Oder mittich)Verschaltet in Reihe?