King NAV/COMM questions...

[comfortcat]

Greetings!

Two questions:

1. Can I use a Skyview as a CDI for an older NAV/COM like a King KX-155?

2. Do you use a separate antenna for the GS on an King KX-155? So, for the KX-155, I need three antennas: COM (vertical) NAV (top of tail whisker) and GS on belly?

advTHANKSance

CC

 

[rv9av8tr]

I'm not an avionics person, but I do have a KX-155 in my plane. My understanding is the KX-155 Nav out signal is analog, so can't be used as an input to EFIS's. I asked about Analog to digital conversion for inputs to EFIS's, but the answers I got was no. That's why you have to use a radio like SL-30 or 40.


https://picasaweb.google.com/116654282962520736797/InstrumentPanel02#5469059886145654994

GS doesn't have it's own antenna. The GS signal gets isolated off the Nav signal using a splitter box between the antenna and the radio receiver.

 

[BobTurner]

1. You can use a separate GS antenna (like mid '70's Cessnas) but VOR antennas are electrically okay for GS, so most people split the signal between the VOR and GS inputs, using a splitter made for that purpose. A few radios (SL30, for one) have the splitter built-in.

2. Not familiar enough with Skyview. Other EFIS units (GRT, for example) have analog inputs that will work with localizer signals, but you need to convey OBS info, usually via ARINC digital format, for the VOR to work.

 

[hgerhardt]

The KX-155 has a "composite" output that won't work with anything other than the specific King nav head. BUT, you can get a King KN-72 converter that gives you the discrete signals needed by at least some EFIS's. That's what I did for my BMA Efis1 years ago.
http://www.seaerospace.com/king/kn72.htm

And a GS/VOR splitter works fine. Don't need a separate antenna.