Avionics-List Digest Archive

Mon 11/05/07


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 05:55 AM - SL-70 findings (Ralph E. Capen)
     2. 07:09 AM - S-Tec 30 Testing findings (Ralph E. Capen)
 
 
 


Message 1


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    Time: 05:55:36 AM PST US
    From: "Ralph E. Capen" <recapen@earthlink.net>
    Subject: SL-70 findings
    Thanks to the folks on these lists for the help so far. Here's what I've done/found: Upon start-up the SL-70 says TEST and FAIL in the two display windows. If I turn the little knob on the right - it goes to the specific tests individually - all PASS except for SYN, RECV, and TRAN Took antenna direct to the back of the unit (down to the first piece of coax. No change Measured continuity of the first piece of coax Open from center to shield Initial resistance of center conductor goes to zero shortly Initial resistance of shield does not go to zero but remains very low The Transponder did not come alive - although it still continues to pass encoder info to the GPS Here's what I think: The radio portion of the unit is hosed and the box needs to go in for repair - off to call GarminAT repair. The first antenna coupling (in the back of the unit's tray) and the first chunk of cable attached thereto is where I'll start troubleshooting the resistance problem. Here's where I need comments: RG400 shield resistance - I think it should go to zero just like the center conductor. The first pair of connectors appear to be silver plated - and the plating appears to be oxidized - I would think that inserting and reseating the connector should (but shouldn't need to) renew the connection. Thanks in advance, Ralph Capen


    Message 2


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    Time: 07:09:49 AM PST US
    From: "Ralph E. Capen" <recapen@earthlink.net>
    Subject: S-Tec 30 Testing findings
    I was able to put the GX60 in the simulator mode and get it to drive the autopilot (sorta). I pressed the OBS button and entered in the course - nothing happened when I moved the bugs or the card and didn't know what to do after that so I tried a GPS flightplan course. The simulator mode moves the flight path so quickly that the roll signals were very short in duration. They were correct relative to the flight plan changes programmed, so I think that part is OK. Then the GPSS interface unit quit completely. Here's what I'm thinking: I was able to get the unit to work with both the Century NSD1000 and the GX60 at different times through the GPSS box so I'm pretty confident that I don't have any major wiring issues. I'll do continuity checks on the interfaces to make sure that the wiring is correct. At a minimum, I need to send in the GPSS interface for a bench-check Your opinions, please: The OBS thing - how's that work? What's it used for? I'm not instrument rated (but am setting this plane up for the training) so forgive my lack of training based ignorance. Thanks, Ralph




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