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This thread is privately moderated by John Kim, who may elect to delete unwanted replies.
Feb 07, 2011, 11:01 AM
Trader Rating: 43
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JR Max Computer TX $20. Convertible to 2.4


JR Max Computer 6 ch transmitter
40.73MHz

Internal removable RF module makes DIY conversion to 2.4 easy. Remove module and connect 3 wires to 2.4 module. Replace original antenna with 2.4 antenna. Done.

Manual, battery included.
Very clean and perfect.

$20 plus actual shipping cost

Matching 40.73 receiver $20.

Additional picture was added to show internal RF module.
Module is removable and is connected by only 3 wires. Red and Brown for power supply and orange for PPM signal. Connect these wires to new 2.4 DIY module and change antenna.
You are done.

Contact via PM
Last edited by John Kim; Feb 13, 2011 at 04:29 PM.
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Feb 07, 2011, 04:27 PM
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pm sent
Feb 09, 2011, 11:21 AM
Trader Rating: 43
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Additional picture was added above to show internal RF module.
Module is removable and is connected by only 3 wires. Red and Brown for power supply and orange for PPM signal. Connect these wires to new 2.4 DIY module and change antenna.
You are done.
May 19, 2011, 02:24 PM
Trader Rating: 9
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volto's Avatar
Hey John. I tried this with my JR max computer radio (72mhz) with a FrSky module, and it didn't work. The module powers up and was able to bind to the receiver but no PPM signal was coming through to the receiver. If you still have this radio, what voltage do you read on the PPM output of the radio? Mine is -1.44v for the orange wire.

Thanks!
May 27, 2011, 11:54 AM
Trader Rating: 43
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Quote:
Originally Posted by volto View Post
Hey John. I tried this with my JR max computer radio (72mhz) with a FrSky module, and it didn't work. The module powers up and was able to bind to the receiver but no PPM signal was coming through to the receiver. If you still have this radio, what voltage do you read on the PPM output of the radio? Mine is -1.44v for the orange wire.

Thanks!
Which version is your FrSky module? They updated it by adding a diode to ppm wire.
May 28, 2011, 01:35 PM
Trader Rating: 9
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volto's Avatar
Mine has a diode. Found out the problem was the ppm wire needed to actually be soldered, I just had it plugged in to a pin, servo plug type thing, but I guess that was a noisy connection and messed up the ppm waveform. Do you still have this radio?

Thanks!
Jerrod
Jun 03, 2011, 11:04 AM
Trader Rating: 43
Suspended Account
Jerrod,

My JR Max TX was sold.

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