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References in periodicals archive ?
* Scans the measurement receiver over the test-frequency range to locate harmonics and spurious emissions. Measures and compares to the limit.
The devices are optimized to minimize spurious emissions in the cellular phone bands and to not be blocked by co-located cellular transmitters.
With the ability to perform modulation analysis, and measure code domain power, transmit power, adjacent channel power, occupied bandwidth and spurious emissions, the unit is designed for measuring basestations and mobile and basestation amplifiers at both the research and development and production stages.
Preamplification may not be needed; but if it is used, precautions should be taken to avoid signal overload and the consequent limiting and spurious emissions. As with all other measurements, the EUT must be rotated and the antenna raised and lowered to maximize the reading.
The model FSP13 is capable of testing the spurious emissions (between 9 kHz and 12.75 GHz) stipulated in the GSM specification, and an innovative firmware allows adjacent-channel power (ACP) measurement to W-CDMA/3GPP.
Identification of spurious emissions levels can be more difficult if the test site is exposed to ambient fields although there are few other transmitters operating in UWB bands so far.
Next comes measuring the spurious emissions from the DUT, which requires looking at leakage into adjacent channels, such as adjacent channel power ratio (ACPR).
Then out-of-band spurious emissions tests check for signal leakage into frequency bands above and below 2.4 GHz, such as leakage out of the industrial scientific medical (ISM) band.
Operating frequency 2.6 to 10.2 (MHz) RF input/output 10 level (dBm) Phase control (bits) 8 binary Phase range ([degrees]) 0 to 360 Phase linearity ([degrees]) [less than] 2 error Differential accuracy ([degrees]) [+ or -] 0.5 Harmonic distortion (dBc) [less than] - 40 Spurious emissions (dBc) [less than] - 90 The I and Q modulators take the DC control signals from the I and Q channels and the RF input signals and create output signals, which are modified in phase and amplitude.
Similar to spurious emissions, spectral purity has to do with the quality of the spectrum in the allocated channel and adjacent channels.
Selecting and performing the five main measurements, including modulation analysis, RF power, occupied bandwidth, adjacent channel power and spurious emissions, can be selected by pressing a single key.