Snowbird wrote:
: I know the KI-209a will accept input from a GPS.

: Is that just for the left-right course deviation indicator, or
: is it set up to accept input to the glideslope as well, for use
: w/ VNAV? Anyone know?

: Alternatively: is the output from the glideslope receiver/input
: to the glideslope portion of the CDI some sort of funky King
: signal which the CDI has to decode, or is it straight analog?

Sydney, the GS signal is a standard signal for almost all radios,
something like +/- 150 microamps. As I recall it is not switched
with the GPS relay, but it has been a while.

The left-right of KI209a has an input for "composite" VOR signal which
is what a KX-155 or KX170 outputs, and a second input for +/- volts
which is what the GPS outputs. A relay inside the KI-209a switches these
two sources. The OBS is also switched so that the GPS can use it, as
many IFR GPS require an OBS.

--
Aaron Coolidge (N9376J)