610
Chapter 14, Diagnostics Descriptions
Description of the Digital Assembly Diagnostics (CDMADIAG)
N:\mkt\MANUALS\HP8924C\ALR\diagnos.fb
I/Q Modulator
Q Control
Voltage
This is the Qquadrature adjust signal that is derived
from the quadrature Adjust Error Voltage.
IQMOD_VCQ
I/Q Modulator
LO Bias Volt-
age
This point monitors the output of a DAC that tunes a
VCO inside the I/Q Modulator IC.
IQMOD_VBLO
DAC Quadra-
ture Adjust
Output
This point monitors the output of a DAC that adjusts
the phase of the I/Q Modulator IC to achieve quadra-
ture.
IQMOD_QUAD_ADJ
I/Q Modulator
IC DI and DQ
pins
These points monitor the quadrature adjust lines out of
the I/Q Modulator IC before reaching the Quadrature
Adjust circuitry.
IQMOD_Di_diag
IQMOD_Dq_diag
I/Q Modulator
Ground
This point measures the ground potential of the I/Q
Modulator Assembly.
IQMOD_GND
Zero Power RF
Detector Offset
This point measures the offset of the RF Power Detec-
tor at the zero power state.
IQMOD_RF_DET_OFFSET
Table 135
Cell Site Analog
Measurement
Explanation and Suggestions
Measurement Point
Cell Site 1
Video DACs
Reference Volt-
age Supply
This point measures the level of the reference supply for
the three Cell Site #1 video DACs.
CSAN_VREF_2_S
Cell Site 2
Video DACs
Reference Volt-
age Supply
This point measures the level of the reference supply for
the three Cell Site #2 video DACs.
CSAN_VREF_4_S
Control DACs
Reference
Voltage Supply
Sense
The +15V supply is regulated to +10V and used as a ref-
erence for the Gain DACs. This voltage is sampled
through a 1-to-2 voltage divider; so this voltage should
measure very close to +5 V.
CSAN_PLUS10_REF_S
Cell Site 1 Amp
1 Gain Control
These points monitor the output of the Cell Site #1 Gain
Control DAC Q and I gain control lines.
CSAN_I1_GAIN_S
CSAN_Q1_GAIN_S
Table 134
I/Q Modulator (Continued)
Measurement
Explanation and Suggestions
Measurement Point
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Страница 53: ...Contents 53 N mkt MANUALS HP8924C ALR 8924CE TOC Index 633 ...
Страница 54: ...Contents 54 N mkt MANUALS HP8924C ALR 8924CE TOC ...
Страница 70: ...70 Chapter 1 Introduction Hardware and Firmware Enhancements N mkt MANUALS HP8924C ALR intro fb ...
Страница 137: ...137 N mkt MANUALS HP8924C ALR per_adj fb 4 Periodic Adjustments ...
Страница 448: ...448 Chapter 9 HP 8924C E Specifications General Specifications N mkt MANUALS HP8924C ALR specs fb ...
Страница 449: ...449 N mkt MANUALS HP8924C ALR service fb 10 Service Screen ...
Страница 454: ...454 Chapter 10 Service Screen Troubleshooting with the Service Screen N mkt MANUALS HP8924C ALR service fb ...
Страница 455: ...455 N mkt MANUALS HP8924C ALR blkdia fb 11 Block Diagrams ...
Страница 522: ...522 Chapter 11 Block Diagrams Assembly Details N mkt MANUALS HP8924C ALR blkdia fb ...
Страница 530: ...530 Chapter 12 HP 8924C Replaceable Parts Replaceable Parts Listing N mkt MANUALS HP8924C ALR 24c_rpl fb ...
Страница 538: ...538 Chapter 13 HP 8924E Replaceable Parts Replaceable Parts Listing N mkt MANUALS HP8924C ALR 24e_rpl fb ...
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Страница 640: ...Index 640 N mkt MANUALS HP8924C ALR 8924CE IX V VOLUME control 61 W Write Protect Cal Data 143 ...