Hi everyone,
I’m in the process of supporting a KNS 80 NAV System installation and wanted to consult the collective wisdom of the Mooney community regarding best practices for shielding and grounding the P801 wiring, specifically for the various NAV/DEV/FLAG lines.
I've reviewed the original manuals and wiring diagrams, but a number of points remain ambiguous. I’m hoping some of you have practical experience or updated recommendations for compliance with modern EMI/RFI requirements.
Specific questions:
NAV FLAG + (Pin 1) & +LEFT DEV (Pin 5):
Is there a best-practice for shielding these specific lines?
Should the shields be grounded at the equipment, the indicator, or both?
Should these lines be routed as shielded twisted pairs or is there a preferred configuration?
Other NAV/DEV/FLAG/GS lines on P801:
Is individual shielding for each signal line preferred, or can a multi-core shielded cable be used?
For those who have done modern avionics retrofits, what routing and shield termination has proven most effective for noise immunity?
General KNS 80 integration tips:
Any lessons learned, “gotchas”, or recommendations for integrating the KNS 80 into a legacy or glass panel?
Are there known issues with certain CDI/HSI models and signal wiring?
I’ve attached an extract of the P801 pinout for reference (see below/attached).
Your real-world experience and advice would be invaluable and much appreciated!
