DIY RF69 module

[wvdakker]

Hi,

I want to build my own RFM69/HW 433Mhz module. I have very little space on my board and a default module is to big.
I found the RF69v1.3 datasheet. Figure 42 shows the schematic of the 433Hz module.
However the default HW board have also a N83 and G4C chip on board. Why is this?

I have the KiCad schematic ready based on the datasheet. However the 2 chips have to land (or not) somewhere.

Any clues?

Thanks

[Felix]

The N83 is a transistor and G4C is a RF switch. They are needed when you want a HW or HCW configuration. The datasheet has a schematic for the 20dBm that includes the RF switch. For W/CW you can go without as can be seen on those modules.
IMO the effort required to make the module is far higher than its worth trying to fit a 16x16mm on your board, ex the RFMHCW.

[wvdakker]

The N83 is a transistor and G4C is a RF switch. They are needed when you want a HW or HCW configuration. The datasheet has a schematic for the 20dBm that includes the RF switch.

Found the datasheet for the G4C. The N83 not yet. Now I have to reverse engineering the connections of the G4C and N83.
Is the N83 a special transistor for RF? I only found one from atmel. But that one is for higher voltages (80V and higher).

IMO the effort required to make the module is far higher than its worth trying to fit a 16x16mm on your board, ex the RFMHCW.

Yes it is some extra work. But on the other hand I have flexibility to place my components.

If I have my Kicad schematic ready I will place it heren.

[Felix]

The N83 is just a generic BJT, drives the rf switch.