CHANGE
8
(Cont'd)
Pages 5-26 to 5-28, Paragraph 5-20:
Replace Paragraph 5-20 on pages 5-25 to 5-28 with 5-20.
ALC
ADJUSTMENT PROCEDURE (CHANGE 8) from this
document.
Pages 5-31 to 5-32, Paragraph 5-22:
Replace the PROCEDURE and Figure 5-22 with 5-22. POWER
CALIBRATION PROCEDURE (CHANGE 8) from this
document.
Pages 5-33 to 5-34:
Delete Paragraph 5-23. POWER METER
LEVELING
CALIBRAIION, Figure 5-23,and Figure 5-24.
Pages 5-34 to 5-36,
ALC
GAIN
ADJUSTMENf:
Replace all reference to A4Rll with A4R15.
In DESCRIPTION, change A4Ull to A4U9.
Under EQUIPMENT change the Power Meter listing to: "HP 432A/B/C, 436A, 438A." Change the Thermistor
Mount listing to: "Any sensor compatible with the power meter being used."
Replace Figure 5-26 with
Figure
5-26.
ALC Gain Adjustment Location (CHANGE
8)
from this document.
Pages
6-7
to 6-9, Table 6-3:
Replace the parts list for the A4 Assembly with
A4 Replaceable Parts (CHANGE
8)
from this document.
Page
8-1 8,
A4
ALC
Asssrnbly:
Add the following paragraph at the end of the A4 ALC assembly description:
"In the
ALC
MODE [MTR], the A4 assembly uses both the power meter and the internal leveling loop to level
the power.
Each loop has a separate log amplifier. The output of the 'internal log amplifier is sent through a high
pass R-C filter and combined with the output of the power meter log amplifier. This composite signal represents
the actual RF power.
The power meter leveling loop responds to low frequency variations, while the internal
loop responds to high frequency variations."
Page 8-36, A4 AUTOMATIC
LEVELING
CONTROL (ALC), CIRCUIT DESCRIPTION:
Replace pages 8-36 to 8-44 with
A4 ALC CIRCUIT DESCRIPTIONAND TROUBLESHOOTING (CHANGE
8)
from this document.
Page 8-45, A4 Service Sheet
Figure 8-30:
Replace with
Figure 8-30. A4 ALC Component Locations (CHANGE
8)
from this document.
Table 8-10:
Replace with
Table 8-10. Leveling Control Lines (CHANGE
8)
from this document.
A4P1 Pinout Table:
Replace with
A4P1 Pinout Table (CHANGE
8)from this change sheet.
Figure 8-33:
Under NOTE, change the middle paragraph to read: "Adjustment of the
EXT/MTR ALC CAL screw will affect the
waveforms at
TP8 and TP5 Adjust the CAL screw until the correct waveforms are obtained."
Figure 8-34:
Replace with
Figure 8-34. Open Loop Wav4forms (CHANGE
8)
from this document.
Figure 8-35:
Replace with
Figure
8-35.
A4 ALC Schematic Diagram (CHANGE
8)
from this document.
CHANGE
8
To Next Page
Loading...
