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Update CPPM_HW_Mod.md

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docs/CPPM_HW_Mod.md
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@ -6,7 +6,7 @@ On a STM32 module and with a simple hardware modification, you can go around thi
There are 2 ways to connect the module CPPM trainer signal available on the STM32 USART1.TX pin (BOOT0 programming TX pin) to the radio:
1. Use the trainer jack input which is supported by all radios.
1. Use the heart beat module bay pin 2, currently supported by erskyTX but not yet by OpenTX. It also seems from reports that not every FrSky radios (X10/X12?) supports this... **After this mod the module should be flashed with the radio off**
1. Use the heart beat module bay pin 2, currently supported by erskyTX but not yet by OpenTX. It also seems from reports that not every FrSky radios (X10/X12?) supports this...
For the hardware modification you need:
1. 1K resistor