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Tell him to try it outside the hangar. ;-))
Jim Burns wrote: A friend of mine has a 12v Garmin 430 that simply does not pick up the satellites. It worked fine about 3 weeks ago (the last time he flew) but now it fails to find any satellite signals. One avionics tech said that it had "lost it's almanac" and to pull it out and let it sit for a couple hours and it should pick up the satellites and work fine. No such luck. All power and antenna connections are good and nothing has happened to the airplane or the equipment since it flew last. Any ideas? Anybody ever hear of such a thing? Thanks, Jim |
#2
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#3
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Blind 430
A friend of mine has a 12v Garmin 430 that simply does not pick up the
satellites. It worked fine about 3 weeks ago (the last time he flew) but now it fails to find any satellite signals. One avionics tech said that it had "lost it's almanac" and to pull it out and let it sit for a couple hours and it should pick up the satellites and work fine. No such luck. All power and antenna connections are good and nothing has happened to the airplane or the equipment since it flew last. Any ideas? Anybody ever hear of such a thing? Thanks, Jim |
#4
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On Tue, 28 Dec 2004 18:37:24 -0800, "Jim Burns"
wrote: A friend of mine has a 12v Garmin 430 that simply does not pick up the satellites. It worked fine about 3 weeks ago (the last time he flew) but now it fails to find any satellite signals. One avionics tech said that it had "lost it's almanac" and to pull it out and let it sit for a couple hours and it should pick up the satellites and work fine. No such luck. All power and antenna connections are good and nothing has happened to the airplane or the equipment since it flew last. Any ideas? Anybody ever hear of such a thing? The almanac includes a list of parameters that allow the GPS receiver to determine where to 'look' for each satellite. Without an almanac (and a valid time reference), the GPS receiver is forced to brute force search for the satellite PRNs. Older GPS receivers did not have enough processing power to effectively perform this brute force search. So they would take 15+ (sometimes much longer) minutes to 'cold start'. Newer GPSs have more powerful processing engines, and do much better on cold starts. I do not know for sure, but would expect a 430 to have a new enough engine to manage a cold start in ~15 minutes. So anyway, that is a possibility. If there is an option for setting the time on the receiver, start with that. Be sure and set the clock as accurately as you can. Make sure the plane is outdoors and has a good 'view' of the sky. Pulling it into a tight row of T-hangars still leaves a lot of the horizon blocked. It is probably best to take it for a flight. If the plane is flown for 30 minutes and the 430 doesn't lock, there is a problem, time to troubleshoot. I would pull the radio and have an avionics shop bench test it. That way you know if you are dealing with a radio problem or an antenna/cabling issue. (from your paragraph above, I am wondering how the antenna and connections were verified 'good' without getting the GPS to work). -Nathan |
#5
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I wouldn't say that the cableing and antenna connections were positively
verified 'good', just that the 430 worked when the airplane was last shut down and hangered and that there are no visable problems with the cables or antenna and the connections are snug. This is however the direction he is checking next. He flew it over to an avionics shop yesterday, unfortunately the owner was gone. He's had it sitting outside running for over an hour as well as flown it for over an hour and it still doesn't pick up the satellites. I'll see if he can set the date and time and try it again. Thanks, Jim |
#6
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Borrow another 430 and see if it is the box or the installation.
Mike MU-2 "Jim Burns" wrote in message ... I wouldn't say that the cableing and antenna connections were positively verified 'good', just that the 430 worked when the airplane was last shut down and hangered and that there are no visable problems with the cables or antenna and the connections are snug. This is however the direction he is checking next. He flew it over to an avionics shop yesterday, unfortunately the owner was gone. He's had it sitting outside running for over an hour as well as flown it for over an hour and it still doesn't pick up the satellites. I'll see if he can set the date and time and try it again. Thanks, Jim |
#7
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His is a 12v, only other ones around here are 24v. Avionics guy should be
back today. Jim "Mike Rapoport" wrote in message ink.net... Borrow another 430 and see if it is the box or the installation. Mike MU-2 "Jim Burns" wrote in message ... I wouldn't say that the cableing and antenna connections were positively verified 'good', just that the 430 worked when the airplane was last shut down and hangered and that there are no visable problems with the cables or antenna and the connections are snug. This is however the direction he is checking next. He flew it over to an avionics shop yesterday, unfortunately the owner was gone. He's had it sitting outside running for over an hour as well as flown it for over an hour and it still doesn't pick up the satellites. I'll see if he can set the date and time and try it again. Thanks, Jim |
#8
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I think all the recent ones work on either 14 or 28V.
Mike MU-2 "Jim Burns" wrote in message news His is a 12v, only other ones around here are 24v. Avionics guy should be back today. Jim "Mike Rapoport" wrote in message ink.net... Borrow another 430 and see if it is the box or the installation. Mike MU-2 "Jim Burns" wrote in message ... I wouldn't say that the cableing and antenna connections were positively verified 'good', just that the 430 worked when the airplane was last shut down and hangered and that there are no visable problems with the cables or antenna and the connections are snug. This is however the direction he is checking next. He flew it over to an avionics shop yesterday, unfortunately the owner was gone. He's had it sitting outside running for over an hour as well as flown it for over an hour and it still doesn't pick up the satellites. I'll see if he can set the date and time and try it again. Thanks, Jim |
#9
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Could be. Yesterday he visited the FBO that we used to lease the 182RG from
and they checked that one, it was only 28v. We're kind of in a 430 deprived area of Wisconsin Jim "Mike Rapoport" wrote in message link.net... I think all the recent ones work on either 14 or 28V. Mike MU-2 "Jim Burns" wrote in message news His is a 12v, only other ones around here are 24v. Avionics guy should be back today. Jim "Mike Rapoport" wrote in message ink.net... Borrow another 430 and see if it is the box or the installation. Mike MU-2 "Jim Burns" wrote in message ... I wouldn't say that the cableing and antenna connections were positively verified 'good', just that the 430 worked when the airplane was last shut down and hangered and that there are no visable problems with the cables or antenna and the connections are snug. This is however the direction he is checking next. He flew it over to an avionics shop yesterday, unfortunately the owner was gone. He's had it sitting outside running for over an hour as well as flown it for over an hour and it still doesn't pick up the satellites. I'll see if he can set the date and time and try it again. Thanks, Jim |
#10
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Are your tax payments current?
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