Re: clock, data, and power on same line?
- From: Jim Thompson <To-Email-Use-The-Envelope-Icon@xxxxxxxxxxxxxxx>
- Date: Wed, 22 Aug 2007 07:17:53 -0700
On Wed, 22 Aug 2007 05:57:13 -0700, Tim Shoppa
<shoppa@xxxxxxxxxxxxxxxxx> wrote:
On Aug 21, 8:14 pm, "Jon Slaughter" <Jon_Slaugh...@xxxxxxxxxxx> wrote:
Is there any theorical reason why this can't be done? and if not then why is
it not practical?
Devil is always in the details. There are many examples of it being
done, and being done for at least 70 or 80 years.
I actually like the old Westinghouse SCADA equipment that used 807's
to put the carrier onto the power lines. I saw it being deinstalled as
recently as ten years ago.
Tim.
Back in the days of ON TV (over-the-air subscription TV for you
youngsters)...
Being at ~450MHz (IIRC) it was line-of-sight, and my house was in the
shadow of Mummy Mountain.
But 150' to the west in my back yard it wasn't.
So I put a helical antenna (around 8" diameter by 6' long) up in a
Mesquite tree, along with a UHF tuner enclosed in a ABS housing, so I
could send IF at ~45MHz back to the house, rather than lose it all at
450.
Power was 18-24V on the coax, regulated down to 12V for the tuner. The
18-24V variation was used to adjust the varactor.
Of course there were appropriate LC's at each end to separate signal
from power.
So you can do anything with 1-wire if you set your mind to it ;-)
...Jim Thompson
--
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