[Elecraft] PIC Stuff

[Wayne Burdick]

Good suggestions, John.

Regarding crystal vs. resonator: paradoxically, the resonator is more likely to
start up than a crystal, assuming the resonator is not bad. The on-chip
oscillator needs noise to kick it into action. The resonators are "noisier"
(lower Q), and in my experience, they never fail to start. I've seen some cuts
of crystal fail because their Q is actually too high, requiring a resistor in
parallel or series to make them happy.

One thing I'd suggest is using the "HS" oscillator mode. This increases
oscillator current and gain, and can make marginal crystals or resonators come
up more quickly.

Wayne



"John J. McDonough" wrote:
> 
> Try setting the power up timer in the configuration bits.  Also, check that
> the configuration bits are set right for the resonator.
> 
> You might also try a crystal instead of the resonator - might get a cleaner
> startup.
> 
> 72/73 de WB8RCR   
> 
> ----- Original Message -----
> From: "Timothy A. Raymer" <traymer@mail.state.mo.us>
> 
> > I have a friend working on a project with a PIC 16F872.