You'll likely need it for IFR ceritification, but it should cost
considerably less than $700. As another poster pointed out, the switching
relay is internal to the 209A (as indicated by the "A"). So you need an
annunciator panel that does not need to include the relay, such as
Ameri-King AK-950-L for the KLN-89B. (The L means no internal, big relay).
You might contact the mfgr. directly and may be surprised at a reasonable
quote. It still seems like a lot of money for the function, but it's TSO'd,
has both latching swithes and a momentary switch, plus a momentary test
switch to test all bulb, annunciations of various colors, and auto dimming.
A little more to implement than a couple of switches and a couple of bulbs.
YMMV.


"N523RV" wrote in message
...

I have acquired a KX-155, KLN-89B and a 209A indicator. The 209A has a
built-in relay to switch between the GPS and NAV. I'm trying to figure
out what 'annunciation' is _required_ for this setup. The MD41
annunciator is about $950. I can get the control head only for about
$700.

The real question is do I have to have this? $700 seems like a lot for
a couple of switches and some lights! Can I not have a simple toggle
switch on the panel to switch between NAV/GPS and let the 89B do all
the annunciation?

Matthew


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N523RV