Service manual

INTRODUCTION
1-8
March 2000
Part No. 001-3139-502
1.3.2 8000 SERIES RDM AND RVM ALIGN-
MENT
1. Connect an RF Signal Generator to Receiver Ant 1,
set S1 to “ANT1”. (See Figures 2-3 or 2-5.)
2. Set the signal generator to the receive channel fre-
quency at an output level of 100 µV modulated with
a 1 kHz tone at ±1.5 kHz deviation (±750 Hz for
900 MHz).
3. On the RDM, set S1 sections 1-3 as shown in Fig-
ure 1-12 and reset the RDM. This disables the FSK
gate and enables the Audio gate. (See Figure 2-8.)
Figure 1-12 RDM S1 AUDIO GATE ENABLE
4. On the RDM connect a Transmission Test Set to
TP3 and adjust R29 for a meter reading of -20 dBm.
If signal level is required to be reduced, do so
evenly for the level settings of Steps 4 through 7
(see Figure 2-8.)
5. Connect a Transmission Test Set to TP4 on the
RDM and adjust R35 for -12 dBm.
6. On the RDM set S1, sections 1=Off, 2-3=On and
reset the RDM by pressing S3 momentarily. This
enables the FSK gate and disables the Audio gate.
7. Connect a Transmission Test Set to TP4 on the
RDM and adjust R46 for -20 dBm.
8. On the RDM set S1, sections 1-3 On and reset the
RDM by pressing S3 momentarily.
9. On the RVM connect a Transmission Test Set to
the TP associated with the input port being used
(see Section 6.8 and Figure 6-4.) Verify that this TP
is self-adjusted in approximately 3 minutes to
-20 dBm.
Port 1 - TP2
Port 2 - TP3
Port 3 - TP4
Port 4 - TP5
10.On the RVM connect a Transmission Test Set to
P1, pin 21 (on the back of the RVM) and adjust U44
for approximately -17 dBm (see Note below).
Record the settings of S2 in the RVM.
1 ___ 2 ___ 3 ___ 4 ___
Figure 1-13 RVM S2 SWITCH
Figure 1-14 U44 LEVEL ADJUST
NOTE: On the RVM adjust U44 by setting S2, sections
1-3 as shown in Figure 1-18. To decrease the level set
S2, section 4 “On” and to increase the level set to
“Off”. Press S1 repeatedly until approximately -17
dBm level is reached. Refer to NOTE 2 on next page
concerning U44.
11.Disable or shut off the Signal Generator RF output.
Disconnect the Signal Generator from the RDM.
Connect the antenna cable coax to the Antenna 1
input on the RDM (S1 should still be set to
"ANT1").
O
N
2
1
8
7
6
5
4
3
S
1
L
S
B
M
S
B
O
N
S2
2
1
4
3
O
N
S2
2
1
4
3
MSB
LSB