skimask, I bet your sending data continously. As I ran these tx/rx modules on the bench I noticed that the more data they sent continously the better the receiver alligned to the transmitted signal. I send 1 packet of 32 bits (64 manchester bits) with a sync pulse once every minute and the best reliable baudrate I can get is 500 baud manchester. I suppose if I sent a couple thousand bits I might pick up 1 or more packets at 380 ft.. Are you using the stock antennas or have an external antenna?

Dave Purola,
N8NTA