Linear ADVANCED AT7200, Руководство пользователя

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AT7400 Owner Manual Rev. 2.0 – October 2006-10-23 Section 3 - 20/39
3.9.4. Module 4464 – PCB 3446 – Adjustment Procedures
The PCB CIM3446 can be adjusted either locally, meaning inside of the equipment, (recommended for simplicity)
or outside of the equipment. On either situation, one
MUST
always use a 50
Ω
load connected at the RF output.
RF
IN
+32V / 2A VOLTAGE
SUPPLY
3
2
1
6
5
4
RF
IN
RF
OUT
NETWORK ANALYZER
+12V / 1A VOLTAGE
SUPPLY
+5V / 1A VOLTAGE
SUPPLY
+32V
T2
T4
R
1
3
R
28
TP O-2
V GS T4
H
I
-2
H
I-
1
CON -1
T3
T1
C41
C4
TPO -1
V GS T2
C13
+12V
+5V
R7
R23
R14
R15
.
BLF1 822
BLF 18 22
(GY )
(BR)
(RD)
(RD)
8359
LINEAR
MODULE 4464
30dB / 50W
ATTENUATO
R
6
5
.
.
C
5
C
9
C
13
T1
C
3
5
C
3
9
T2
C
I-
4
CI- 2
TP O-2
T2
V GS ADJ
TPO-1
V GS A DJ
T1
CI -1
HC-1
R9
R10 +32V
CON- 2
CON- 2
+32V
C
O
N
-
3
ID1
ID2
TE MP
R11
B
L
F8
6
1
A
. CI -3
S 1
.
CI -5
.
CI- 7
.
CI- 8
T4
T3
B
L
F
8
61
A
+32V / 2A
EXCITER TEMPERATURE
ALARM
3.9.4.1 Drain Current, (ID) - Adjust for T2 and T4
No RF signal should be present at the RF input of the module 4464. Turn the module ON and wait for 3 minutes
for thermal stabilization of the circuit. Use a good quality multi-meter able to read mVdc, avoid to used auto-range
multi-meters.