[amsat-bb] Re: G5500 az el issue resolved!
Stephen E. Belter
seb at wintek.com
Wed Jul 27 06:11:53 PDT 2011
I replaced the meter bulbs in my G-5400B once, only to be disappointed that they burned out relatively soon.
I have now put two white LEDs above each meter. From memory, I put two LEDs and a current limiting resistor (about 1 Kohm) in series and connected it to the 12 volts for the bulbs, one set above each meter.
I sent you a picture by separate e-mail.
73, Steve N9IP
Thanks to all for the refresher on the 5500 repair. I replaced the 17806P (which I think has a 6v output) with a 7805. This fixed the problem. I had to recalibrate as my max readings in the SatPC32 rotor calibration routine dropped because of the assumed lower output voltage of the 7805 regulator. I could only get a max azimuth reading of 206, somewhat less than the 255 needed, but this seems to work ok.
Does anyone know a source for a replacement bulb in the display? Both my bulbs are burned out and I would like to replace them with something I can obtain locally. Thanks again for all the help...
73 Jeff kb2m
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