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Old 07-15-2019, 08:51 PM
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thompsonbr87 thompsonbr87 is offline
 
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Default Garmin 430W won't acquire satellites

I'm finishing up installation of a Garmin 430W and it is not acquiring satellites. After about 10 minutes, I get, "GPS is not responding. Check GPS antenna." I've tried the 430w in another airplane, and it worked fine. Antenna cable has no shorts from signal to ground. Antenna is a new GA-35. Cable is about 17' right now (planning to cut it down later). The satellite status page didn't appear to acquire anything, so maybe a center pin is not making good contact? Any way to test this? Other ideas? Thanks in advance!
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Old 07-15-2019, 10:19 PM
BobTurner BobTurner is offline
 
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Pull off both connectors, make sure the center pins are locked in position.
Use your ohmmeter to make sure pin to pin has continuity (may need some wire and/or an assistant). Do the same for the shield connections.
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Old 07-16-2019, 12:30 AM
mturnerb mturnerb is offline
 
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Same tray as other airplane? In addition to checking antenna and cable continuity, make sure tray is right and antenna connection is seating properly (and that radio is seating fully in the tray).
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Old 07-16-2019, 04:10 AM
noelf noelf is offline
 
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Check to make sure the GPS antenna / coax cable actually go to the GPS input on the 430 back plate.
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Old 07-16-2019, 06:38 AM
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Make sure the plane is outside of the hanger with good access to the sky also. My GTN650 could not acquire a satellite signal in the hanger but my G3X could!
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Old 07-16-2019, 07:44 AM
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Continuity between the pins is good. Same for the shields. I connected a different antenna/cable combination into the backplate, and the 430 began picking up satellites slowly (which I understand is typical for a unit that has not been used recently), but eventually picked up more satellites than I cared to count. Visually inspecting the cables, I'm now suspecting that one (if not both) of the pins may not be protruding far enough. I supposed the antenna (brand new from Garmin) could be bad, but the chances that my first BNC & TNC connectors are flawed seems much more likely.
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Old 07-16-2019, 07:48 AM
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Did you check for continuity between the shield and the pin? There should be none ...
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Old 07-16-2019, 07:52 AM
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Quote:
Originally Posted by bkervaski View Post
Did you check for continuity between the shield and the pin? There should be none ...
Yep. That was suspect #1.
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Old 07-16-2019, 08:54 AM
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What do you have operating that could be creating interference near the antenna? Some other GPS antennae have been demonstrated to give Garmin's antenna problems when in close proximity, I know Dynon GPS 250/2020 do not cause that problem but have not tested any others.

You could remove your current antenna and simply place it anywhere else to determine if you've got interference.
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Old 07-16-2019, 11:52 AM
BobTurner BobTurner is offline
 
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Quote:
Originally Posted by thompsonbr87 View Post
but the chances that my first BNC & TNC connectors are flawed seems much more likely.
I did the same thing on my first TNC install. There should be a definite "click" as the center pin locks into place. Otherwise, the pin gets pushed in when you attach the connector. If you can push the pin in at all, it's not right.
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