<https://forum.allaboutcircuits.com/threads/cheap-ebay-rf-modules-made-easy-and-fast.84185/>
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"Hi, these crude carrier-only type RF modules can be bought very cheaply now from a number of online suppliers. (usually 433 MHz and 315 MHz modules).\r\n\r\nI did some testing of the modules and show how to use them for simple USART comms between micro-micro or micro-PC USB.\r\n\r\nI also tested the burst times and recover times etc, and tested transmitting a low frequency for people who might want to use these modules without microcontrollers.\r\n\r\n\r\n\r\nThis kind of thing comes up from time to time on the forum, and although there are quite a few online projects using these modules those projects are usually pretty sketchy, usually just a schematic and some code.\r\n\r\nI've tested the modules a little bit more indepth, and hopefully this may be of use to others. :)\r\n\r\nAlso I show a simple new data protocol to get much higher speed data transfer (and more data reliability). Source code is provided for that in C.\r\n\r\nThe project can be seen here;\r\nhttp://www.romanblack.com/RF/cheapRFmodules.htm"
<https://forum.allaboutcircuits.com/threads/cheap-ebay-rf-modules-made-easy-and-fast.84185/#post-601902>