Hi Matthew, I had a similar issue when I was playing with one a few years ago. The problem appeared to be that the AGC took a while to settle and until it did, the data slicer didn't work properly. The fix I came up with was to extend the preamble out so that the AGC had properly settled before data was transmitted. This added ~200mS or so to the reansmission time if I remember correctly. This is assuming that the ones you have tried are the cheap OOK (AM) type. If you can find an FM receiver (and transmitter) then there's no AGC to worry about anyway. I did find there was a window following a short preamble that was OK, but it didn't last long and that a longer preamble was more reliable. The preamble can be "tuned" from a simple 50% ratio to better match the charecteristics of the data stream also for a small reduction in preamble time. Even with good reception it pays to add data checking and redundancy to overcome burst errors. RP On 20 January 2017 at 12:13, Matthew Miller wrote: > Hi, > > I've been having trouble finding 433MHz receivers which work. I have a > project designed for a SIP style module, but at this point I'll settle fo= r > any package as long as the receiver works. I have tried 4-5 different > receivers and they all have had one of two modes of operation: > > 1. So many random pulses on the digital output as to be unusable. > 2. Good reception, except the _middle_ of the bits of a byte are not > output. > > Only one module was in category 2, a RLP-434A from SparkFun. Funny thing = is > the module's analog signal strength output clearly showed all bits being > received! > > I'm open to any recommendations and ideas. Thank you. > > Matthew > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .