cgrossl
Well Known Member
Sorry this is not RV related, but I wasn't sure of anywhere else to post a question like this. I've never ran across a general avionics forum on the net.
Anyway, my airplane came with a GNC300XL in the panel. I know its old, but it works great. I also had an INS429 so I thought I'd install it, as well as the an AK950L annunciator panel to get myself a basic IFR panel. I have no intentions of IFR flight, just wanted to be able to work on the rating.
The INS429 manual:
http://downloads.valavionics.com/INS_429_INSTALL_MANUAL_04-15 rev3.pdf
It includes an interconnect diagram (pg17) that shows how to connect it to the 300XL. That is how I wired them together. I have verified that the wiring matches the diagram multiple times. I talked to Val Avionics and they recommended that I send the INS429 back to them to see if the unit was producing an OBS signal. They verified that it was and did a minor alignment and sent it back to me. They are thinking that there is something wrong with my 300XL. I admit this is possible, but I think it unlikely. The reason is, that it was redone by Garmin back in 2004. It then sat on a shelf, or in the instrument panel for years and years until it was finally put into service last summer. It works great and it seem unlikely, at least to me, that only the circuitry that receives the course input signal is bad, and nothing else. I could very well be wrong on this.
My question is, what could keep the GPS from receiving the course input from the INS429? Other than that minor issue, the CDI functionality seems to work fine. Are the three resolver lines shown in the diagram what transmits this data? It would be really nice if the problem was just a setting, but I have seen no settings concerning the OBS resolver. I think it most likely that my problem was caused by me and my installation. 1 possibility that I came up with concerns a note on the INS429 Interconnect diagram. Note 4 says, "Connecting resolver to garmin units only requires 1 line, leave the matching pair disconnected." I followed these directions, but I wonder if I should connect the matching pair. I have asked VAL this and they say there is no need.
Thoughts?
Anybody know where I can send the 300XL to get bench tested?
Anyway, my airplane came with a GNC300XL in the panel. I know its old, but it works great. I also had an INS429 so I thought I'd install it, as well as the an AK950L annunciator panel to get myself a basic IFR panel. I have no intentions of IFR flight, just wanted to be able to work on the rating.
The INS429 manual:
http://downloads.valavionics.com/INS_429_INSTALL_MANUAL_04-15 rev3.pdf
It includes an interconnect diagram (pg17) that shows how to connect it to the 300XL. That is how I wired them together. I have verified that the wiring matches the diagram multiple times. I talked to Val Avionics and they recommended that I send the INS429 back to them to see if the unit was producing an OBS signal. They verified that it was and did a minor alignment and sent it back to me. They are thinking that there is something wrong with my 300XL. I admit this is possible, but I think it unlikely. The reason is, that it was redone by Garmin back in 2004. It then sat on a shelf, or in the instrument panel for years and years until it was finally put into service last summer. It works great and it seem unlikely, at least to me, that only the circuitry that receives the course input signal is bad, and nothing else. I could very well be wrong on this.
My question is, what could keep the GPS from receiving the course input from the INS429? Other than that minor issue, the CDI functionality seems to work fine. Are the three resolver lines shown in the diagram what transmits this data? It would be really nice if the problem was just a setting, but I have seen no settings concerning the OBS resolver. I think it most likely that my problem was caused by me and my installation. 1 possibility that I came up with concerns a note on the INS429 Interconnect diagram. Note 4 says, "Connecting resolver to garmin units only requires 1 line, leave the matching pair disconnected." I followed these directions, but I wonder if I should connect the matching pair. I have asked VAL this and they say there is no need.
Thoughts?
Anybody know where I can send the 300XL to get bench tested?