Frank Stucki asked for limits at frequencies over 1 GHz.
1. Proposed CISPR limits in CISPR/B/204/CDV for radiated field strength 1-18
GHz, applicable to ISM equipment, Group 2, Class B, producing CW type
disturbances and operating at frequencies above 400 MHz, peak measurements
with RBW of 1 MHz and a VBW of at least 1 MHz @ 3 meters are:
Frequency Field strength
GHz dB(uV/m)
1 - 18 70
Note: For the protection of radio services, competent national authorities
may require lower limits.
2. Proposed CISPR limits in CISPR/B/204/CDV for radiated field strength 1-18
GHz, applicable to ISM equipment, Group 2, Class B, producing fluctuating
disturbance other than CW type disturbances and operating at frequencies
above 400 MHz, peak measurements with RBW of 1 MHz and a VBW of at least 1
MHz @ 3 meters are:
Frequency Field strength
GHz dB(uV/m)
1 - 2.3 92
2.3 - 2.4 110
2.5 - 5.725 92
5.875 - 11.7 92
11.7 - 12.7 73
12.7 - 18 92
Note 1: Limits of this table were derived considering fluctuating sources
like magnetron driven microwave ovens.
Note 2: For the protection of radio services, competent national authorities
may require lower limits.
3. Proposed CISPR weighted limits in CISPR/B/204/CDV for radiated field
strength 1-18 GHz, applicable to ISM equipment, Group 2, Class B, producing
fluctuating disturbance other than CW type disturbances and operating at
frequencies above 400 MHz, peak measurements with RBW of 1 MHz and a VBW of
10 Hz @ 3 meters are:
Frequency Field strength
GHz dB(uV/m)
1 - 18 60
Note: For the protection of radio services, competent national authorities
may require lower limits.
There is a decision tree for applicability of limits. Closing date for
voting on document CISPR/B/204/CDV was 31 August 1998.
ITU, Radio Communications Study Groups, Working Party 10B, expressed their
concerns in a document 1-5/46-E from 24 March 1998 that proposed limits are
too relaxed and thus will cause significant damage to reception of a digital
sound broadcasting.
Regards,
Mirko Matejic
