SMC Networks D3USG Manual De Usuario
ANSI C63.17-2006
Methods of Measurement of the Electromagnetic and Operational Compatibility of UPCS Devices
The target region normally has borders both in the frequency and time domains. Note that the procedure
described in 7.2.3 only defines the borders in the frequency domain; no compensation is to be made for
limited isolation in the time domain.
Figure 9 shows the relationships between the threshold being tested and the interference power levels
discussed in this subclause. The objective is to create a situation in which the residual interference power
level on the target frequency (due to imperfect frequency selectivity of the EUT) is Y dB below the
regulatory threshold limit, while the power on the other (blocked) frequencies is X dB above the regulatory
threshold limit. The multicarrier generator is adjusted so that the power on the frequency channel(s)
adjacent to the target frequency is X
described in 7.2.3 only defines the borders in the frequency domain; no compensation is to be made for
limited isolation in the time domain.
Figure 9 shows the relationships between the threshold being tested and the interference power levels
discussed in this subclause. The objective is to create a situation in which the residual interference power
level on the target frequency (due to imperfect frequency selectivity of the EUT) is Y dB below the
regulatory threshold limit, while the power on the other (blocked) frequencies is X dB above the regulatory
threshold limit. The multicarrier generator is adjusted so that the power on the frequency channel(s)
adjacent to the target frequency is X
A
dB above the threshold, where X
A
can be up to 3 dB below X. Z = X +
Y represents the total decibel difference between the residual interference power on the target frequency
and the interference on the blocked frequencies, except for the adjacent frequencies, for which the total
decibel difference is Z
and the interference on the blocked frequencies, except for the adjacent frequencies, for which the total
decibel difference is Z
A
= X
A
+ Y. Z and Z
A
depend on the EUT frequency selectivity characteristic, typically
determined by the intermediate frequency (IF) filtering. The way in which Z is divided between X and Y
depends on the power level applied to the EUT from the interference generator on the blocked frequencies.
The following procedures determine the proper level.
After out-of-operating-region interference is applied, it should be verified that the EUT is operating
properly on the target frequencies.
depends on the power level applied to the EUT from the interference generator on the blocked frequencies.
The following procedures determine the proper level.
After out-of-operating-region interference is applied, it should be verified that the EUT is operating
properly on the target frequencies.
Figure 9
7.3
—Relationships among power levels for out-of-operating-region interference
Deferral thresholds and channel selection
These tests determine the lower and upper thresholds of the EUT and verify that if the EUT is operating in
the LIC mode, it can properly select the channel with the lowest interference power, within a 6 dB
resolution.
Some EUTs can transmit and be tested without a companion device, for example, devices transmitting
signaling beacons. For those EUTs, a companion device may not be necessary for these tests. Other EUTs
(typically handsets) cannot transmit without being locked to a control channel or beacon of a companion
device (typically a base station). Therefore, when a companion device is required, the interference signals
must be received by the companion device at a lower level, at least 10 dB lower, than the interference
signals are received by the EUT. Otherwise, the operation of the EUT may be masked by the undesirable
the LIC mode, it can properly select the channel with the lowest interference power, within a 6 dB
resolution.
Some EUTs can transmit and be tested without a companion device, for example, devices transmitting
signaling beacons. For those EUTs, a companion device may not be necessary for these tests. Other EUTs
(typically handsets) cannot transmit without being locked to a control channel or beacon of a companion
device (typically a base station). Therefore, when a companion device is required, the interference signals
must be received by the companion device at a lower level, at least 10 dB lower, than the interference
signals are received by the EUT. Otherwise, the operation of the EUT may be masked by the undesirable
16
See 47CFR15.323(b), 47CFR15.323(c)(2), and 47CFR15.323(c)(5).
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