User's Manual

Repeater Installation
2-14
R1920T Chart 4 TDMA out of band spurious limitations
R1920G Chart 5 GSM out of band spurious limitations
CDMA Example for out of band spurious:
Air Interface: CDMA
Block: A (1930MHz to 1945MHz)
Channels: 100 (1935.0 MHz)
150 (1937.5 MHz)
Repeater: R1920C
The frequency difference between the two carriers is (1937.5MHz - 1935.0MHz = 2.5MHz = X). The frequency
difference from the band edge to the carrier is (1935.0MHz - 1930.0MHz = 5.0MHz). Therefore, there are
(5.0MHz / 2.5MHz = 2) multiples of X from the carrier to the band edge. Using Chart 1 we see that the
composite power must be kept below 34dBm.
Two TDMA carriers spaced "X" MHz apart
vs
The frequency difference from one carrier to the band edge
38
35
32
29
26
0
10
20
30
40
5X 4X 3X 2X 1X
Multiples of "X" from carrier to band edge
Composite
Output Power
(dBm)
Two GSM carriers spaced "X" MHz apart
vs
The frequency difference from one carrier to the band edge
38
35
32
29
26
0
10
20
30
40
5X 4X 3X 2X 1X
Multiples of "X" from carrier to band edge
Composite
Output Power
(dBm)