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Modding Fisher-Price 72825 Formel Junior Fernlenkflitzer

Step 2Modifying the transmitter

Modifying the transmitter
We want to change the working frequency from 27.415Mhz to something that is as far away from that frequency we can get but still inside the 27Mhz band. Looking into frequency tables we find a standard quartz with 27.005Mhz, beeing channel 5 here in Europe.

On the transmitter side only the old quartz need to be replaced by the new one. Dismantle the remote control, locate the quartz, desolder it and solder the new in the same location.

Now it's time for the first testing. When using the remote control the car should NOT respond to it. That's the way we like it to be because the original (not modified) car should not be controlled by a modified remote control. If that does not work for you, the difference between the two frequencies is not big enough.
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1 comment
Feb 29, 2012. 1:44 PMsliderguy82 says:
On the transmitter side i have located the transmitter but it is welded and does not look like a quartz crystal. Do i need to take that of and get a quartz crystal and weld that on?



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Author:frickelkram
radio amateur since i was 16, education in electronics, built extension-cards for ibm pc, build machines to make concrete, studied communications engineering, had a dot-com company in the late ninetie...
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