TB 9-6625-2137-24
NOTE
It may be necessary to press TI FREQ STEP pushbutton for
fine tuning to get proper dBmO indication.
(2) Tune TI frequency control above 1 MHz for a -3 dBmO indication, and record
frequency indication.
(3) Tune TI frequency control below 1 MHz for a -3 dBmO indication and subtract
frequency reading from reading recorded in (2) above. The difference between the two
frequencies will be between 18 and 22 Hz.
(4) Repeat (1) through (3) above for 400 Hz bandwidth. The difference between the
two frequencies will be between 360 and 440 Hz.
(5) Repeat (1) through (3) above for 3100 Hz bandwidth. The difference between the
two frequencies will be between 2790 and 3410 Hz.
b. Adjustments. No adjustments can be made.
a. Performance Check
(1) Press TI pushbuttons as listed in (a) through (c) below:
(a) [RECALL] [0] and AUTO CAL off.
(b) [RECALL] [.], [CNTR FREQ], and [7].
(c) MEASUREMENT/ENTRY [OFFSET], ENTRY
[RDNG
OFFSET],
FREQUENCY TUNE [AUTO], and BANDWIDTH [20 Hz].
(2) Slowly tune frequency control to the first frequency above 1 MHz for a dBmO
indication of 0.30 dBmO, and subtract 1 MHz from frequency reading. The difference will
be greater than +3 Hz.
(3) Repeat (2) above to first frequency below 1 MHz for an indication of 0.30 dBmO
and subtract reading from 1 MHz. The difference will be greater than -3 Hz.
(4) Repeat (1) through (3) above for 400 Hz 50 Hz bandwidth and for 3100 Hz
1000 bandwidth.
b. Adjustments. No further adjustments can be made.
15. 400 Hz Shape and 20 Hz Pilot Filters, Bandwidth
a. Performance Check
(1) Press TI pushbuttons as listed in (a) through (c) below:
(a) [RECALL] [0] and AUTO CAL off.
(b) [RECALL] [.], [CNTR FREQ] and [7].
(c) MEASUREMENT/ENTRY [OFFSET] ENTRY
[RDNG
OFFSET],
FREQUENCY TUNE [AUTO], and BANDWIDTH [400 Hz].
(2) Tune TI frequency control to the first frequency above 1 MHz for an indication of
-60 dBmO. Subtract 1 MHz from frequency reading. The difference will be equal to or less
than +1100 Hz.