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I bought some 433mhz senders and receivers and some 433 mhz antennas. Unfortunately I don't know where to solder the antennas.

Where do I solder the antennas to and do I need special solder wire?

Pictures of the sender module

front, back

Sender front Sender back

Pictures of the receiver module

front, back

Receiver front Receiver back

I tried to solder an antenna onto the sender (into the hole in the bottom left hole in the front picture), this resulted in the signals no longer being sent correctly. I could see that data was sent because the receiver did receive data, but it was not the data i sent with the sender.

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  • \$\begingroup\$ The datasheet supplied with the TX and RX should explain. They should also explain why the TX has a missing inductor compared with the one in the listing. If there isn't any such data, learn the rule : no datasheet, no sale. \$\endgroup\$
    – user_1818839
    Feb 22, 2020 at 14:48
  • \$\begingroup\$ @BrianDrummond looks like the small coil is the antenna, the one missing on the TX module. \$\endgroup\$
    – jaskij
    Feb 22, 2020 at 19:05

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