Table of Contents
Advertisement
2.
Set FUNCTION switch to Gen. and DISPLAY switch to Gen/Mon Mtr.
3.
Select frequency from RF memory table or enter directly from keyboard.
4.
5.
Adjust 1 kHz level for 3.0 kHz deviation and RF level for 12 dB SINAD indication. (The mobile
radio audio output may be set to the desired level using the DVM AC mode.)
Read receiver SINAD sensitivity in microvolts or dBm.
R-2001
VERT /SINAO
DVM/COUNTER
FUNCTION
.:.~k~;.:.":'E
Ft1
p
l .
F F
lt'~'El
FREQUENCY
OPL CODE
RF IN/OUT
IN
~ ~
-.'.:
l- ,.; H·ll
RF OUTPUT
LEVEL
MOBILE
RECEIVER
ANALOG SINAO
INDICATOR
NEG DEVIATION
"1(1
• 1
(!
8521-23
DIGITAL SINAO
READING
POS DEVIATION
ANALOG
DEVIATION
INDICATOR
Figure 4-8. Test Setup for FM Receiver Sensitivity Using Generator and SINAD Meter with CRT Display
b:
Test pager decode and alert function, and demonstrate simultaneous modulation.
1.
2.
3.
4.
Set FUNCTION switch to Gen and DISPLAY to Tone Mem.
Select pager frequency from RF memory table or enter directly from keyboard.
Enter pager tone code frequencies and select desired time sequence in memory table.
Activate and adjust Code Synth. Lvl. for 3.3 kHz deviation on Gen/Mon Mtr. display. (5 kHz
system)
NOTE
Timing sequences 1 through 4 are preset and can not be changed. Timing
sequences 5 through 8 are keyboard programmable for testing other pager types,
upper and lower timing limits, or future schemes.
4-18
c.
RF IN/OUT
PAGER
R·2001
MIC IN
o-
MIKE
p
A TONE
FREQUENCY-
'TONE t1EHDF\'
SEQ SELECT
1
g
A~
O$S?.O H:
6) 05!0.5 HZ
ll
HE
ill ill.U
8 TONE
-FREQUENCY
PROGRAMMED{
1 · . o:40
s:&o
0
~,
0
f:j
0
TOHE
~TONE
ONLY TIME SEQUENCE
CANNOT
~·
t."O 0,0(•
(<,.;.
0 1 ,;. 0
f·N'T
;.F\ ..
r-t-TONEWITHBATTSAVEATIME
CHANGE
'
!.(•(•
0.00 '·.00
l,,.o Ttt\V(E
L--TONEANDVOICETIMESEOUENCE
•~ 0.00
(1,(1(1
f,,•)O
3.00 GF-P Cl
I~
t-
1
o.rs
o.oo c.:-D t.!·O
USE
R TIME {
~;~c;o·(.-;;;r>-J~H·-I-:To--·-···--·-
GROUP CALl TIME SEQUENCE
SEQUENCE
7• 1.00
o.o~
t.r:o
1.~0
!MAY BE
I ' 0 • I 0 0, I 0 0, I 0 0. I 0
CHANGED)
8521·26
Figure 4-9.
Test Setup for Pager and Alert Functions with CRT Display
Troubleshooting Receiver audio stages using "DVM and Signal Generate" function simultaneously.
1.
Select the DVM function by means of the arrow keys located below the DISPLAY column.
2.
3.
4.
5.
6.
7.
Using the keyboard "down" arrow position the CRT cursor adjacent to the "DVM Mode"
graphics.
Enter a "1" via the keyboard to select AC voltage measurement or a "2" for DC voltage
measurement selection.
Set up the desired on-channel RF signal to provide an input to the receiver.
Set Function switch to "Gen". Set appropriate RF output level (as indicated on the CRT screen).
Apply test signals from the receiver audio stages to the instrument's "Vert/Sinad DVM/Counter
In" input. DC Voltage measurement points are also applied to this same input. The supplied XI
test probe may be used.
Refer to the CRT screen for an auto-ranging and analog/digital indication of either DC voltage
or AC voltage and corresponding dBm level.
NOTE
The AC DVM indication of dBm is referred to 600 ohms.
4-19
Advertisement
Table of Contents
