For a couple of R/C onboard applications I am using PIC18F family with
overall success, so far working with INTOSC. However, it has a few
clock stability problems, particularly when using RS232 high speed to
download data, it looks very dependent on temperature. This has been
discussed a number of times here.

What I wonder is how dramatic change in EMI could be to move to HS
crystal osc. In my case, I am not concerned on EC/FCC regulations but
on impact on other devices onboard, including but not limited to the
R/C receiver. I got a few suggestions to use INTOSC to limit EMI when
compared to HS (same speed, say 8MHZ) but I was never presented with
real data, so this is more intuition than sciense. To make it worse, I
have no instruments to measure EMI, except try/error and standard
range check. I am looking for more specific data.

Does anyone have info to share, real experiments, or a pointer to
online info on specific EMI curves of HS/HSPLL and INTOSC? Or any
suggestion on how to measure this myself?

TIA

-- 
Ariel Rocholl
Madrid, Spain
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