Motorola SG 2000 用户手册
O v e r v i e w
2 - 1 7
SG 20 00 Ins tal la tion and O pera tion M anua l
Figure 2-10 illustrates the gain option selection chart for 870 MHz:
F i g u r e 2 - 1 0
O p t i c a l i n p u t v e r s u s 8 7 0 M H z g a i n
O p t i c a l i n p u t v e r s u s 8 7 0 M H z g a i n
-5
38
40
42
44
46
48
50
52
-3
-4
-2
-1
0
1
2
Bridger output level (dBmV), 870 MHz equivalent
(Trunk output level is 10 dB lower)
O
pt
ic
al
input
(
d
B
m)
870 MHz Gain Selection
Lo gain limit, 110 ch
Hi gain limit, 110 ch
Lo gain limit, 94 ch
Hi gain limit, 94 ch
Hi gain limit, 110 ch
Lo gain limit, 94 ch
Hi gain limit, 94 ch
Figure 2-10 gives the output level at 870 MHz. For a system loaded with analog channels to
750 MHz, the actual level at 750 MHz is 1.7 dB lower with the standard overall tilt of 11.5 dB. For
the low tilt of 9.0 dB, the reduction at 750 MHz is 13 dB. For the high tilt of 14 dB, the 750 MHz
level is 2.1 dB lower than at 870 MHz.
750 MHz, the actual level at 750 MHz is 1.7 dB lower with the standard overall tilt of 11.5 dB. For
the low tilt of 9.0 dB, the reduction at 750 MHz is 13 dB. For the high tilt of 14 dB, the 750 MHz
level is 2.1 dB lower than at 870 MHz.
For a system loaded with analog channels to 650 MHz, the actual level at 650 MHz is 3.1 dB lower
than the given 870 MHz level with the standard overall tilt of 11.5 dB. For the low tilt of 9.0 dB, the
reduction at 650 MHz is 2.4 dB. For the high tilt of 14 dB, the 650 MHz level is 3.8 dB lower than at
870 MHz.
than the given 870 MHz level with the standard overall tilt of 11.5 dB. For the low tilt of 9.0 dB, the
reduction at 650 MHz is 2.4 dB. For the high tilt of 14 dB, the 650 MHz level is 3.8 dB lower than at
870 MHz.