Piotr,
For that frequency, you might instead want to look at EN 302291.
Best regards,
Sent from my DROID
-----Original message-----
From: Piotr Galka <[email protected]>
To: EMC-PSTC <[email protected]>
Sent: Tue, Oct 4, 2011 19:17:54 GMT+00:00
Subject: EN 300 330-1v1.7.1, RFID sidebands versus Spurious
I'm a designer who wants to understand measurements.
The device is 13,56MHz RFID short range (5cm) reader.
Sidebands measurement:
In 7.4.2 I read: "The transmitter shall be modulated with standard test
modulation...."
Spurious emission measurement:
In 7.5.3.1 I read: "The equipment under test shall be switched on with
normal modulation....."
Then according to Annex G the sidebands limit for 13,59MHz + 900kHz and
more is -16dBuA/m and for spurious emission in the same frequency range the
limit is -3.5dBuA/m (7.5.3.2 Table 8).
Tell me please how to distinguish sideband from spurious (if both are
measured with modulation switched on) to know which limit to apply ?
Do I have to look if the same is on the right and left of 13,56 than
-16dBuA/m and if only on one sight then -3.5dBuA/m ?
If it is to be done that way than what is the logic behind saying that
for example signal 16,56MHz is more danger for other devices if there is also
the same amplitude signal at 10,56MHz (limit -16dBuA/m) then if there is no
signal at 10,56MHz (limit -3.5dBuA/m) ?
In 6.5 I read: "there should preferably be a facility to operate the
transmitter in an unmodulated state", but I didn't found the measurement when I
will have to set my reader to work with unmodulated field.
What am I missing?
Best regards
Piotr Galka
MicroMade
Poland
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