I have a vintage King KLN-90B installed in my RV-4 and I have a bit of a snag with it and was wondering if someone here familiar with these old GPS would have a clue on what could be the problem..
it looks like that it is no longer seeing the satellites or at least it doesn’t after 1/2 hrs and I’m getting a ‘’FLAG’’ annunciation when in the NAV window.
I tried a different antenna, made sure the coax was good, enter a present position just to give it a head start in finding where it is etc...but it still doesn’t appear to see the satellites...
In the ‘’STA+1’’ window where you see the satellites it is looking at all I get are ‘’00’’ for SNR & ELV ... After 1/2 hr today I had 1 or 2 satellites that were showing some sort of SNR ( Sound to Noise ) and elevation but that was it...
Any idea what might be the problem??
I’m thinking that the internal memory battery is either dead or very weak and the GPS has to find where it is every time it boot up and it takes a long time.. Am I right on this...??
If so, how hard is it to replace the battery if someone has ever done it??
Thank you for any info you may provide.