Give a Second Chance to your Old Radios (Part 2)

by JACKFIRE | January 4, 2014 | (5) Posted in Projects

72Mhz & 2.4Ghz in one

Ok guys, I hope you liked the part 1, in this very part 2 I'm showing a deeper modification made to my JR SX-600 transmitter, I been using AA battery packs to power my radios . But what about those unused cell phone batteries? , this is why I decided to try to use them in this radio, so this is the results. Also in this Tx I kept the 72Mhz module because sometimes in the field may be there someone using FPV Systems in 2.4Ghz.

 


If this look interesting to you, this is how I made it. (Have you noticed?, there is no battery?) 

 

 

 


First let´s take a look inside because in this case we will put inside the transmitter a 2.4 Ghz module, as well cellpohone bateris and keep the transmiter´s 72 Mhz module.

 

This is what I did, As you can see there is no more free space inside, I know it looks messy but works really great, first take a look on the battery cells, they are three cell phone batteries connected in series with a balancing port like a lipo pack

 

 

And those are the Diagrams for both modifications

 

Cells connection and balancing port

 

Frequency Selection

 

 

So that's it. let me Know if you have any question. Thanks

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COMMENTS

KJ4CCH on February 10, 2014
how did you wire up that switch? I wanna do this to my Futaba, but cant figure out the whole switch thing.
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JACKFIRE on February 11, 2014
I understand you want to keep both frequencies; there is two ways to do it, you need a switch which allows you to select the frequency you want to use. the switch can be 3 or 6 pin and two positions. If you use the 3 pin switch in the center pin goes the Vcc(+) from the radio, in the other two pins goes each module, in that way you will energize one module on each position.
sin
With the 6 pin switch is the same process, in this case you also can switch the ppm signal, the ground (-) is common for the radio and both modules.

I hope this helps you to your proyect. Ask again if you need anything more

Thanks
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kamil_sz_n on February 15, 2014
Hi
I have a question about batteries. Now I use 5x NiMh and want to change it to 2x li-ion cells because they are better than this old and cheaper than li-fe (for 2 batteries from I9100 I pay only 6$). This batteries have built inside electronic Have you checked how it is with discarge these batteries. Was this electronics does not allow too deep-discharge - maybe you tested it?
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JACKFIRE on February 15, 2014
hi, first I want to thank you for your interest, I understand that you are trying to use those cells in your aircraft, I dont really recommend that because in certain moments the drain of current is too high for that kind of cells, as you said, the electronic in the cell is for protection of discharges beyond safe limits, besides the device limits the current from the cell to prevent the heating, then if you have two or three servos working at same time, the cells won't provide the power they need.

tha
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kamil_sz_n on February 16, 2014
Hi I want to use this batteries in my transmitter not recievier. I also upgraded my radio on frsky module (futaba 6j). Is it easy or you had some problems with solder wires to contacts in the batteries? Sorry for my language;P
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JACKFIRE on February 20, 2014
Hi, not at all, the soldering is really easy, just try not over heat the batteries.
ps: I'm confused, Two batteries are enough to power up your radio?
Sorry for the delay on responding
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kamil_sz_n on February 21, 2014
Hi I do not have the module 35Mhz, to 2.4 Ghz I need lower voltage - 2 cells. Now I have 5x NiMh so 5*1,2=6V.
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JACKFIRE

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Give a Second Chance to your Old Radios (Part 2)