> I am trying to set up a circuit for an RF control of an LCD.  In setting
up
> the circuit I discovered that I could only send about a byte a second over
> the RF link.  On removing the RF transmitter and RF receiver and attaching
> the encoder HT640 straight to the decoder HT648L I discovered the problem
is
> not the RF devices, but the speed at which data is being encoded and
> decoded.
>
> History:
>
> 1) The circuit is driven by a PIC16F877...  I can vary the delay between
> changes to the pins on the decoder from a single "nop" statement to a loop
> of about a second.

Is there a good reason you're not using the hardware UART built into the
16F877?  I also don't understand how you "discovered" that the speed was
about 8 baud when your code produces that timing.  Is there any reason you
can't set the transmitter and receiver to 300, 1200, or higher baud?  I
assume these are basic AM transmitter/receivers where the carrier is keyed
on and off by the incoming signal?  If so, note that this type of system
need to send a preamble so that the receiver can sense and adjust to the two
carrier levels.


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