Medical equipment falls under the EMC directive enforced in March 1997. The
spec is EN60601-1-2 for those with more money than cents ;)
The spec tests for Emissions (10 meters usually used) (the old standard
required 30 meter test distance. The limits are from 30MHz to 230MHz @
40dBuV/meter and from 230MHz to 1 GHz the limits are 47dBuV/meter.
The spec also requires limits on conducted emissions on the power lines
from 150kHz to 30MHz.
Depending on how it is used the immunity tests range from 3Vrms/meter to
10Vrms/meter for radiated immunity.
The equipment also is required to pass surge tests and fast transient
Conducted RF capacitively coupled to all power lines at 3Vrms carrier AM
modulated @ 80% (levels for 150 ohm load).
Well enough Government crap for me I am done.
(Embedded image moved to file: pic15890.gif)
Richmond" To: email@example.com,
et> Subject: RE: [RFI] Attention
20m fans: Something New for Your Listening Pleasure -
Sent by: Maybe
Please respond to
Interesting post. However, this appears to be little threat. Power and
signal coupling by induction falls off very rapidly with distance. Note
that even with a "booster antenna" (probably a larger area loop on the
sensor) max operating range is 30 mm -- under 1¼ inches. And at 26.48 KB,
bandwidth will not be all that wide. One might be able to pick it up with a
portable SW receiver for a few feet.
Dale, WA9ENA wrote:
> Other than the justifiable flood of BPL messages of late, I do recall
> recent posts possibly involving medical equipment causing 20m
> As was indicated at that time, there is a designated ISM (Industrial,
> Scientific, Medical) band at 13.56 MHz. If that equipment is well
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