433MHz is a license-free area of the RF spectrum in many countries. It tends to be restricted to low power and bandwidth but allows simple modulation schemes making it popular for low cost / bandwidth applications such as keyless entry and alarm systems.
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Detached antenna and connecting wire length
Since my this particular question didn't get any answer, I thought of asking a more focused question, along a path which seems a bit more feasible after few tests.
Is it possible to install the ...
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Transmission via RF433Hz Transmitter/Receiver pair failing AVR
I am trying to send data wirelessly through a RF433Hz receiver/transmitter pair, but nothing seems to want to work.I want to the transmitter to continuously send a number (0x81) to the receiver when I ...
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Preventing Interference when using RF transmitters and receivers
I want to use a "listen-before-talk" approach to transmit data from sensors connected to a transmitter and receiver pair to a MCU connected to a transmitter and receiver, which means that the sensor ...
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Why is 433 MHz still used?
The new RF frequencies are 868 MHz for Europe and 915 MHz for the US. I heard 433 MHz is barely regulated, read: it's chaos. Then why are 433 MHz RF modules still used? Are they cheaper to produce?
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Active 433Mhz RF tag battery life question
I am exploring the world of RTLS system and trying to produce one on my own. I chose 433Mhz frequency for its penetration capabilities and I produced a PCB mounting CC430 TI family MCU-transceiver, ...
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How do I change the frequency of an rf module?
I recently bought an AM radio transmitter/receiver from eBay.
It was only after I bought it, however, that I noticed that the frequency was 315/433 MHz. I live in the UK so only 433 MHz would be ...
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Can anyone identify this 433Mhz OOK protocol?
I am working with some wireless devices that use 433MHz OOK transmitters and receivers. They use a simple protocol for the data sent between the nodes. I feel it is reminiscent of common IR remote ...
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433Mhz Receiver
I'd like to build from scratch a 433Mhz receiver. Can anyone point me to a schematic or some material to learn how to build one? Google search didn't come up with much in the way of building one from ...
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Improve range of 433MHz RF link
I have a system comprised of a wireless sensor which transmits temperature readings to a main base.
The wireless sensor system is made up of:
12F683 pic to take the temperature reading (manchester ...
