Copper Talk » Modifications » Radios » Variable Power on Melakas??? « Previous Next »

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Sintronic_Cpu
Posted on Saturday, March 02, 2002 - 12:41 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Is there a way to put a variable power or a high low switch in a Galaxy Melaka? right now mine keys 3 and swings to 28 after doing a swing mod, but I want to be able to have a higher carrier on FM. Thanks
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Radiodude
Posted on Saturday, March 02, 2002 - 10:45 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I would also like to have the var pwr on my Melaka
Hey 307 got any Ideas???
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Ss8541
Posted on Sunday, March 03, 2002 - 4:39 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

you can make one with a spst switch and a 4.7kohm mini-pot from rshack.

solder a wire from the junction of r238/vr13 to one lug of the switch. the other lug of the switch goes to the center leg of the 4.7k mini-pot. then one of the 2 remaining legs of the minpot goes to gnd. adjust high (vr13) where you want it, and low (4.7kminipot) where you want it. these will interact, and you will need to go back and forth until where you want it.

you can also use a spdt switch with center off with -2- 4.7k pots for a 3 power switch. in this set up the wire from 238/vr13 goes to the center lug. then a wire from each of the 2 unused lugs will got to seperate 4.7k minipots. then the minipots will go to gnd. center is high, switched up is med, switched dn is low (of course you have to adjust the minpots for the levels you want).

you can also use a 20 pot with the 4.7mini for a true adjustable carrier.
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307
Posted on Tuesday, March 05, 2002 - 11:20 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Just remove the on board pot for AM Power. Go to Radio Shack and get a 10Kohm pot , Mount the pot on the rear of the radio and run 3 wires from the three holes on the board where you removed the on board pot to the new pot..It is a snap.

307
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Ss8541
Posted on Wednesday, March 06, 2002 - 12:20 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

that will definitely work also 307. i listed the way above for the guys who want to be able to set their low and high carrier to predetermined min and max. like the radios that come from the factory with variable power. example, if they want a 1w carrier on low and 7w carrier on high (and possibly 3w carrier for med if using a spdt switch), they set that internally and use the outside switch to switch between the 2-3 presets. or, use the outside pot to "vary" between the 2 presets. with the external 10k you can't do that. it just variers from 0w to max carrier. but it is a whole lot easier to install. and that may be exactly what some are looking for (easy and simple).
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Radiodude
Posted on Friday, March 08, 2002 - 9:31 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Ok that will work good for am pwr. How about for ssb?
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Taz
Posted on Friday, March 08, 2002 - 11:07 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

JUST RUN THE SAME THING FOR SSB THEN, HE WAS TALKING ABOUT THE AM POT, NOT THE SSB POT
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Radiodude
Posted on Saturday, March 09, 2002 - 11:44 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I understand that. What I want to know is do I have to have one for each mode?
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Taz
Posted on Sunday, March 10, 2002 - 3:11 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

yes
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307
Posted on Sunday, March 10, 2002 - 7:07 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

You DO NOT NEED an external pot for SSB , you use your microhone gain control for SSB power. Am power , if you want to have variable power , you need an external control.

307
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Taz
Posted on Sunday, March 10, 2002 - 7:51 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Excellent point 307!
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Radiodude
Posted on Tuesday, March 12, 2002 - 10:51 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Ok I got it thanks you guys
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Radiodude
Posted on Sunday, March 17, 2002 - 10:32 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Well I got the var pwr in my Melaka and it works great. Thanks to all who helped
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Taz
Posted on Sunday, March 17, 2002 - 1:36 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

yes, your welcome

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