Panasonic EB-G450, Руководство по обслуживанию

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7.5.3 I and Q Values
NOTE:
ith the I ch a ust ent proce ures the trans itter ust be set to o er Level 5 this presents the orst case o
non-linearity so care ust be taken that the spectru analyser use can accept a signal input o 33 I not an
appropriate attenuator ust be use
I, Q ch Offsets
Spectru Analy er setup
centre re uency 902 4M
R 1 0k
1k
span 1M
s eep ti e 2sec
1.
Set the C controls to channel 62 at po er level 5 nor al burst o ulate ith all 0 s
a ress the o n arro until C A GE C is highlighte an then press E TER
b ress the o n arro until L is highlighte ress E TER
c igure 19 ress the o n arro until T ATA is highlighte ress the ove arro until RL 0
appears in the highlighte iel ress E TER
Figure 19:
C setup 500-0719
2.
igure 20 n the spectru analyser easure the carrier leakage ratio Carrier leakage ratio is easure as
the ratio o peak po er an the po er at 68k belo peak re uency
E a ple
peak po er 902 468M 33
po er at 68k belo peak po er 0
carrier leakage ratio 33 - 0 33
Figure 20:
Carrier leakage ratio 500-0720
3.
I carrier leakage ratio is greater than 30 c then unit is K o set calibration is co plete
4.
I carrier leakage ratio less than 30 c then go to Ich check
Issue 1Section 7 MCUK970901 C8
Revision 0 7 - 14 Service Manual
TEST AND MEASUREMENT