Group,
Does anyone have a document that decodes the RF emission classes? I have been
referred to a web site by one of our chip suppliers that supposedly lists this
information but I don't have any confirmation that it is accurate and if its
applicable to all country standards. I'm particularly interested in JAPAN RF
emission classes. See below or if you want to see the entire article click on
the link.
Thanks in advance,
Jeff Collins
www.circuitdesign.co.jp/de/products/tech_info/guide5.asp
Emission classes
_____
If you look at the specification sheet for radio equipment or a radio module,
if the document is in any way related to the Wireless Telegraphy Act, you will
see the symbols F1D, F2D, A3E and so on. These indicate emission classes. The
emission class indicates the type of modulation of the radio wave of the main
carrier, the qualities of the signal that modulates the main carrier, and the
type of transmission information. The following are examples related to radio
modules.
For example, F1D means 'frequency modulation', 'digital signal, single channel
equipment, as well as 'equipment that does not use a sub-carrier for
modulation', and 'data transmission, telemetry and remote control'.
1. Main carrier modulation types
Symbol
(1) Non-modulation
N
(2) Amplitude modulation @
j Double sideband A
k Full carrier single sideband H
l Reduced carrier single sideband R
m Suppressed carrier single sideband J
n Independent sideband B
o Vestigial sideband C
(3) Angle modulation @
j Frequency modulation F
k Phase modulation G
(4) The main carrier is amplitude and angle modulated either simultaneously or
in a certain sequence D
(5) Pulse @
j Unmodulated pulse sequence P
k Pulse sequence K
a. Amplitude modulation L
b. Amplitude modulation or width/duration modulation M
c. Position modulation or phase modulation Q
d. The carrier is angle modulated during the angle-period of the pulse
V
e. A combination of a. through d., or that uses another method @
(6) Modulation not covered by (1) through (5) and using a combination of 2 or
more of amplitude modulation, angle modulation or pulse modulation,
simultaneously or in a certain sequence W
(7) Other X
@
2. Nature of signals that modulate the main carrier
Symbol
(1) No modulating signal 0
(2) Digital signal, single channel @
j Without the use of a modulating sub-carrier 1
k With use of a modulating sub-carrier 2
(3) Analog signal, single channel 3
(4) Digital signal,! with two or more channels 7
(5) Analog signal, with two or more channels 8
(6) Composite system that combines 1 or more channels for digital signals with
1 or more channels for analog signals 9
(7) Other X
@
3. Transmission information types
Symbol
(1) Non-information N
(2) Telegraphy @
j For aural reception A
k For automatic reception B
(3) Facsimile C
(4) Data transmission, telemetry, or telecommand D
(5) Telephony (including sound broadcasting) E
(6) Television (video) F
(7) A combination of the types (1) through (6) W
(8) Other X
---------------------------------------------------------------- This message
is from the IEEE Product Safety Engineering Society emc-pstc discussion list.
Website: http://www.ieee-pses.org/
To post a message to the list, send your e-mail to emc-p...@ieee.org
Instructions: http://listserv.ieee.org/listserv/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com
For policy questions, send mail to:
Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
