Replacing a KLN94 with a GPS175

D

David Augspurger

Filing Flight Plan
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Oct 22, 2017
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Dirtracer35
Replacing the old dead kln94 with a gps175. I am using a ksc525a with an IRU525 on the back of it.
Most of the pinout seems pretty strait forward except the connections for the OBS

On the kln94 I Have OBS out, sin, cos and return.

On the GPS 175 I have Rotor H Gnd,Rotor C, Stator G Gnd, Stator F, Stator D, and Stator E Gnd.

I assume that all the grounds are common so I would connect return pin from the KLN94 to ground
Maybe rotor C is OBS out, But I don't know which connection is sin and cos. If any of the experts have this info I would appreciate the help.

Thanks
David
 
This is from the 650 install manual, but it appears to indicate F is COS and D is SIN: (I'm a little surprised the 175 manual doesn't have the detail)

screenshot_16.png
 
David Augspurger said:
Replacing the old dead kln94 with a gps175. I am using a ksc525a with an IRU525 on the back of it.
Most of the pinout seems pretty strait forward except the connections for the OBS

On the kln94 I Have OBS out, sin, cos and return.

On the GPS 175 I have Rotor H Gnd,Rotor C, Stator G Gnd, Stator F, Stator D, and Stator E Gnd.

I assume that all the grounds are common so I would connect return pin from the KLN94 to ground
Maybe rotor C is OBS out, But I don't know which connection is sin and cos. If any of the experts have this info I would appreciate the help.

Thanks
David
Click to expand...

I thought this might help anyone else going from a Bendix/King KLN-94 to a Garmin GPS-175 to get the OBS resolver working with the existing KLN-94 wiring:

KLN-94------------------GPS-175
P942---------------------J1751
37 OBS RETURN----2 OBS STATOR H (GND)
34 OBS OUT----------3 OBS STATOR C
36 OBS COS---------25 OBS STATOR F
35 OBS SIN-----------44 OBS STATOR D
---------------------------24 OBS STATOR G (GND) N/C
---------------------------45 OBS STATOR E (GND) N/C

The only other issue when switching is the tray mounting screw holes from the KLN-94 do not line up with the GPS-175 tray so you will need to drill new holes.
 
Last edited:
I'm looking for help. Based on the last comment, the OBS Return on the KLN (pin 37) appears to expected to be a sin Lo. I trying to connect a the KLN94 to a Garmin Gi102A. The Sin Lo is an out and the KLN 94 pin 37 is an out put. Im not sure how this is suppose to be connected. Can help? If go by the chart above , my OBS return should be on the Pin Resolver H.

1759375288532.png
 
I finally got ahold of midcontinent instruments. They stated the Gi102a and Gi106a isn't compatible with the KLN94.
 
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