[PIC] CCP1 Glitches in noisy environment (RC Tx)

Hi All,

I'm having problems tracking down the reason of some glitches occurring on
the CCP1 output and it is driving me a bit crazy.

I'm putting some smarts into a basic RC transmitter.  I've replaced the
current chip producing the pulse train to the RF section with a daughter
board and added a cell phone LCD, some switches and Serial port for input
and output.  The serial port and LCD (spi) work fine and they don't have any
glitches.  The 5 ADC readings for the joysticks (4) and battery voltage also
work well with only 1 bit of noise on a 10 bit reading (referenced to the
power and gnd lines).

The PIC that I am using is the 16F886.  Its supply is a 78L05 on the main
board and I have a 10uf Tant and three 0.1uF on the power lines on the
daughter board.  The daughter board is single sided with a ground plane pour
under the PIC and every else where I could.  Because I don't have ADC
problems or serial or spi errors that noise must be reasonably constrained,
I think.

I'm using CCP1 (pin C2) to produce the PPM that goes to the RF section.  It
is the standard PPM protocol (each channel pulse is 1 to 2 ms wide including
the following 0.3 ms pulse, repeated every 20ms).

Timer1 runs freely.  With a CCP1 interrupt (my only interrupt) I update
CCPR1 with the duration until the next transition high or low and the
CCP1CON bits to set the next transition in the correct direction.  My main
program clears a flag and that is all.

Most of the time it works perfectly and looks like: