There are other little bits and pieces too, other than the
1Mhz req.  See 15.103 for specifics.

BTW, I wanted to use a 1Mhz on the petfeeder, but the
odd thing is that digikey lists these for $7+ ea, while
131.072khz, and 4MHz crystals are approx $2 ea.

What gives?





-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Drew Vassallo
Sent: Wednesday, June 12, 2002 9:05 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: FCC question


>I think you may have made a typo, but R/C aircraft models are on 72MHz in
>the US, not kHz range.

Yeah, it was an unthinking typo.  I did in fact mean to type "KHz" but I
wasn't thinking about the actual frequency, which obviously is MHz, as you
stated.

I think I might instead try to go the other way and simply drop the
frequency down to 1 MHz for the circuit.  It doesn't necessarily HAVE To
function at 4 MHz.  In fact, it'll just drop some of the delay values that I
have and increase the A/D cycles, that's all.  I'll have to check the
datasheets to make sure I don't have to change crystal capacitors.

According to PIC Dude, a frequency of 1 MHz should be low enough to fall
into the "exempt" category, though I haven't checked that fact for myself
yet.

--Andrew

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