I recently got a few of these MX FS 03V 433 MHz transmitter modules. They're a little different than similar modules I've had before – in particular, in not having a clearly-marked place to attach an antenna. The modules I had before used one of the large pins for an antenna connection, the same style pins as the power and data connections.
The four pins here are GND, VCC, and two data connections. I can only presume an antenna needs to be soldered onto the board.
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The only place I can think of to attach an antenna is on the outer side of where the inductor coil comes out of the board. But going by this datasheet:
![Image]()
...there should be a capacitor between the antenna and the coil, and I don't see one on the board. Am I perhaps supposed to provide my own cap?
![Image]()
The diagram above seems to suggest an antenna being directly attached without a capacitor, but sure isn't definitive about the wire attachment point.
The four pins here are GND, VCC, and two data connections. I can only presume an antenna needs to be soldered onto the board.
The only place I can think of to attach an antenna is on the outer side of where the inductor coil comes out of the board. But going by this datasheet:
...there should be a capacitor between the antenna and the coil, and I don't see one on the board. Am I perhaps supposed to provide my own cap?
The diagram above seems to suggest an antenna being directly attached without a capacitor, but sure isn't definitive about the wire attachment point.
Statistics: Posted by kshetline — Sat Feb 08, 2025 2:03 am — Replies 0 — Views 31