4.3.2 MODE SELECT
The modulation mode
is
selected using the
"MODE"
switch. AM, FM, and
CW
(no modulation) are available.
4.3.3
SIMULTANEOUS GENERATE AND MEASURE-
MENT OPERATION
The
following test setups and
LCD
displays are examples
of
simultaneous generate and measurement operation.
1.
Connect the
RF
In/Out to the mobile radio antenna
connector and the multipurpose measurement input
to the receiver audio output.
2. Set the function switch to
GEN
and
IL'::!.J
to Dev.
3.
Enter
the frequency by pressing
EJCD000000EJ
4.
Adjust the 1 KHz level for 3.0 KHz deviation and
then move the cursor
IL'::!.J
to SINAD.
5. Adjust the
RF
venier for
12
dB
SINAD
indication.
6.
Read
the receiver sensitivity in microvolts
or
dBm.
7. Increase the
RF
generator level to 100 uV.
8. Move the cursor
I
L'::!.j
to Dist.
Read
the receiver
distortion in
%.
9.
Move the cursor
IL'::!.J
to DVM.
10. Select
AC
or
DC
volts using
I:C::\
switch.
If
oscillo-
scope display
is
desired select the proper external
vertical trigger for oscilloscope display.
11. Apply test signals from the receiver audio stages to
the unit's VERT/SINAD/DIST/DVM input. The
same
x1
test probe used for
SINAD
and Distortion
may be used.
12. The voltage can be read
on
the left
LCD
display
or
viewed on the oscilloscope.
RF
GEN
154.5500
I I
11
I I I I
12.0 dB
IN/OUT Vert/SINAD
Dist/DVM
MOBILE
RECEIVER
FIGURE
4-1-TEST
SET-UP FOR
FM
RECEIVER
SENSITIVITY
4-2
4.3.4 TEST PAGER DECODE AND ALERT FUNCTION
The
internal programmable code synthesizer generates
PRIVATE
LINE
(PL)
AND
DIGITAL
PRIVATE
LINE (DPL) squelch codes, two-tone sequential paging
and base station tone remote control signal continuously
or
in burst cycles as an internal modulation source. In
addition to the code synthesizer, modulation
is
simul-
taneously available from an independently adjustable
internal 1 KHz tone generator as well as from external
input sources.
1.
Connect the pager test fixture to the
RF
In/Out Con-
nector.
2. Set the
FUNCTION
switch
to
GEN
and
enter
the
frequency from key board.
EJCD000000EJ
3. Select the paging format.
Enter
the pager tone code
frequencies. Start by pressing
1~::
J
4.
Activate by placing the Code Synthesizer switch in the
burst (momentary)
or
continuous position and adjust
Code Synth Lvl for 3.3 KHz deviation. A functional
pager will respond.
D
GEN 154.5500
RF
IN/OUT
Pager
FIGURE
4-2-
TEST SET -UP FOR
PAGER AND ALERT FUNCTIONS
NOTE:
A/B T & V has preprogrammed timing sequences
for two-tone sequential tone and voice paging. A/B V
AR
is
user programmable. Variable timing sequences are
used for
other
signalling systems.
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