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SECTION 1
GENERAL INFORMATION
1-1
DESCRIPTION
The QEI Model 691 Modul
on Monitor/Test
(
Type Approval
Number 3-244
) is an all
id
Modulation Man;
designed to
meet or exceed the
Communication Commission requirements for
measuring the modul
on
cs of FM transmitters having a
frequency range of 88.1MHz
.9MHz both at the transmitter and aff-
air.
The
1 is
in a
1O~"
X 19" rack mount.
All
controls are located on the front panel.
AC
Power,
RF
Inpu
Outputs are located on the rear panel.
1
ELECTRICAL
FICATIONS
RF Frequency Range .................. 88.1 - 107.9r1Hz
(Thumbwheel s
RF rnput (to guarantee 66dB
SIN
in a 30KHz Bandwidth)
An
tenna
... . . . . . . . . . . . . . . . . . . . . ..
3mv
200mv
Signal
........................ 2mw
50W
(depending on external
load)
Total Modulation Display
~iodulati
on Meter
Accuracy ........................ +2% entire range
Frequency
.............. O.2d8 30Hz - 75KHz
Range ........................... 0-133% (-20d8 to +2dB)
111s cs .....•................ per FCC regulations
rs
. . . . . . . . . . . . . . . . . . . . . . . . . . "'.11> • • • • •
Ace u racy,. , ..... " " " . " . . " . . _ " .... " ...... " ... " "
Peak Counter
Poi
Time . . " . " "
II
..
,
"
•
'"
,
11
'"
» "
..
It
'"
. . . .
II
•
'"
. . .
l1li
..
I
(I
0-199%
in
1% increments
+
1%
100%
+
1%
1 minute
+
1 sec.
Distortion .......................... 0.05% THD or IMO
SIN • .••.••••.•.•••••••••••••••.••.••
better
than
{with
de-emp}
in a 30KHz Bandwidth
Test Displays (2)
Me ter
Accu ra cy .................. .
Peak Indicator Ac
.......... .
Meter Range ..................... .
Pilot
&
SCA Injection
better than
+
2% entire range
+"
1%
to -75dB (autoraryging)
~
0.5% (6% to 12%)
~
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