Chapter 3 99
Making EDGE (with GSM) Measurements
Making the Tx Band Spur Measurement
Making the Tx Band Spur Measurement
Purpose
The Tx Band Spur measurement checks that the transmitter does not
transmit undesirable energy into the transmit band. This energy may
cause interference for other users of the GSM system.
Measurement Method
This is a base station only measurement. The transmitter should be set
at its maximum output power on all time slots. This measurement is
performed at RF channels B (bottom), M (middle), and T (top). Refer to
the following table.
The transmit band spectrum is measured in several frequency
segments using resolution bandwidths as specified by the standard (see
the list below).
Band Tx Band Edge
(MHz)
BOTTOM MIDDLE TOP
Low High Freq
(MHz)
ARFCN Freq
(MHz)
ARFCN Freq
(MHz)
ARFCN
P-GSM 935 960 935.200 1 947.600 63 959.800 124
E-GSM 925 960 925.200 975 942.600 38 959.800 124
R-GSM 921 960 921.200 955 940.600 28 959.800 124
DCS 1800 1805 1880 1805.20 512 1842.60 699 1879.80 885
PCS 1900 1930 1990 1930.20 512 1960.00 661 1989.80 810
GSM 450 460.4 467.6 460.600 259 464.000 276 467.400 293
GSM 480 488.8 496.0 489.000 306 492.400 323 495.800 340
GSM 850 869 894 869.200 128 881.600 190 893.800 251
Frequency Offset Resolution
Bandwidth
≥ 1.8 MHz and < 6 MHz
and inside Tx band
30 kHz
≥ 6 MHz
and inside Tx band
100 kHz
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