[TangerineSDR] SAE J2497
David G. McGaw
david.g.mcgaw at dartmouth.edu
Tue Jun 21 00:07:21 EDT 2022
On the Zoom call this evening, Jay WB8SBI brought to our attention a 12V
power-line signalling standard used by heavy trucks, SAE standard J2497,
which can potentially radiate RF outside of a vehicle. It probably is
not of much concern. While I cannot read the actual standard without
paying for it, I was able to find a datasheet on a chip designed to
implement the standard:
It is a spread spectrum protocol using chirped signals swept between
100kHz and 400kHz. It may interfere with radio services in this range,
mostly navigation beacons, but I notice that signals in the AM Broadcast
Band are spec'ed to be -60dB below the signaling level (1.5mVrms max vs
4Vpp max). There is a 400kHz low-pass filter on the signal transmitter
to limit the emissions so ham-band levels would presumably be even less.
Interesting, though. I do know my car has things that can interfere
with FM Broadcast and 2M Amateur radios.
P.S. Happy Summer Solstice!
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