Question about Garmin GPS 48 GPS Receiver

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Garmin 48 external antenna failure

After many years, the external antenna failed to acquire any signals. The short stubby "portable" antenna works fine. I cleaned the antenna connection to the unit. No difference. I I cut off the original fitting and replaced it with new. No difference. Is the antenna repairable or is a new one necessary. If new is necessary, where can one for such and older gps be found? Thank you...David

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  • davidofglory Nov 17, 2008

    Perfecto! I checked the site mentioned, and found one of several options that is said to be compatible with the 48, including the hardware for rail mounting. Cool!

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Check the cords of the antenna and make sure they are connected properly to the unit because a cord may have came apart in the years of it's use. You could get a new antenna, but you can buy a new GPS that is better than the one you have for about the same price as a new external antenna.

Posted on Nov 17, 2008

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Antenna's are not repairable so you need to purchase a new one. I have already check for a compatible antenna for your Garmin 48. Please visit this site: http://www.gps-home.com/gps-products/BNC-M.aspx

Posted on Nov 17, 2008

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Usuallty it is repairable, as there is probably a broken contact to the iextenal antenna.

The antenna wirings must be built again by taking apart the antenna and checking the soldering.

Often is not worth the job, as an external antenna repalacements are not too expensive.

Posted on Nov 17, 2008

  • Ginko
    Ginko Nov 17, 2008

    The price for an external antenna is about $50/$80, depending if it is passive or active (here is an uk seller for example).
    You can also buy from Garmin shop here, better to call them as it difficult to locate the items.

    The alternative is taking apart the antenna cable , and soldering a new antenna cable that you buy at any circuit shop for $10 or so.


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"Upload ...Not Present" message. Nothing else on the screen. I replaced the internal battery last spring used it all summer. Have just checked internal and external batteries and all are fresh 3v internal and new AA four batteries. Upon startup the screen says "Upload" "Not Present" and there is no menu. I have tried hitting Page and Menu, etc. nothing happens. I tried leaving it out and on for 3 hours to see if it would find itself and satellites. I tried connecting to the computer and uploading the internal program the port was not found. Tried this a number of times and a number of ways. I have tried leaving it on to search for 3 hours and have tried to connect to my computer to reinstall the software but that does not work. The internal battery was replaced with a new one last year. I have fresh batteries in the unit. What is the problem? How do I fix it? Thank you. I love this unit and would like to keep it going. I have fixed two others for friends who needed the internal battery fixed. They use it as a backup. I have tried the Auto Locate procedure about 3 times. I have also tried clearing by holding the PAGE + Power. Then tried autolocate. Message "Upload... Not Present" still remains. Also have tried clearing by holding the MARK + Power. Then tried autolocate. Message "Upload... Not Present" still remains. Now I am wondering if this message has to do with an interrupted connection with EasyGPS from last winter. I was uploading waypoints, and thought it had completed and may have turned off and disconnected the plug before an operation was completed in saving waypoints off the Garmin 48. I do not know this for a fact, but that was the last operation I recall doing last fall, before starting the GPS up again on the boat this spring. I have also tried to connect the unit to Easy GPS via the serial port, thinking perhaps it would complete whatever it is trying to do. I have tried uploading routes and downloading routes via EasyGPS send and recieve and it does not seem to work. I wonder now if the interface setting has been reset, by my pressing PAGE+power and Mark + Power earlier. I would not mind that if the menus came up properly, but that is not happening. Is there some other way to kick it out of this mode? I turn it on and there is the message "Upload...Not present" and none of the menu buttons work to get it into the normal startup screen mode..... I've tried Quit, Page, Enter, Goto, Mark, Power (off and on), and none of the get the computer out of this mode and back into the normal menus for startup. I've removed the antennae and checked all the contacts and that seems fine, and reinstalled. Is there some small reboot button inside that I can jumper? I have tried taking the internal battery out and letting it sit for three days and it still does the same thing. Any suggestions would be appreciated

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