Friday, January 23, 2009

Galaxy Melaka Blue LED Conversion + Mods

I have a used Galaxy Melaka CB/HAM base station radio that im working on modding and doing a all blue LED conversion on.

To do the Blue LED mod, I needed SIX 5mm LED's, ONE 470k ohm resistor, and a 2digit channel number LED module.

The MODE selector originally used 6 white 12v wheat lamps.
I removed all 6 lamps, and installed the LEDs, watching the polarity of them. They all share a common POSITIVE, and are selected by the ground. I had to remove the main POS wire, coming off the voltage regulator board, and I added the 470k ohm resistor in series with the wire, so it drops the voltage from 12v to 3v.



The signal meter also used a 12v wheat lamp.
I replaced that with a Blue LED and a resistor.
I will probably add 2 more LEDs to increase the brightness, due to the black background being kind of dark to see.

The channel display takes a little work to de-solder the original module, and then installing the new one is simple as long as all the PCB holes are good and clean.
It takes 8 pins to desolder and put back in.



I also added a echo board to the radio and mounted the control in the back.



I added a simple swing kit, and tuned the radio to 1w deadkey, swinging 6w.



I also added switchable talkback. Simply cut D80, and install a switch.
Open= ON. Closed=Off.
On this board, there is no way to do a variable talkback, unless you install a seperate talkabck board.

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