TB 9-6625-2076-35
NOTE
Proper DDM steps can be entered by pressing
FUNCTION/CONTROL STEP ∆RDL ∆DDM pushbutton.
(10) Press TONE SELECT 150 Hz pushbutton (all other TONE SELECT
pushbuttons off). Record digital multimeter indication
(11) Divide value recorded in (10) above by the value recorded in (9) above.
Calculated ratio will be between 1.11864 and 1.11979.
(12) Repeat technique of (9) through (11) above for each DDM setting listed in table
10. Calculated ratio will be within limits specified.
Test instrument
Calculated ratio limits
DDM settings
Min
Max
0.091
1.25606
1.25733
0.175
1.55918
1.56082
0.400
2.99800
3.00200
(13) Press STD, RDL/DDM, enter 0.045 DDM into TI, and then press T/F U/L D/R
pushbuttons.
(14) Repeat technique of (9) through (12), except to calculate ratio, divide value
recorded in (9) above by value recorded in (10) above.
b. Adjustments. No adjustments can be made.
NOTE
Throughout this performance check, press TONE SELECT
pushbutton as instructed.
All other TONE SELECT
pushbuttons must be off.
a. Performance Check
(1) Connect measuring receiver to TI RF OUT.
(3) Press TONE SELECT 90 Hz pushbutton.
(4) Press FUNCTION/CONTROL %MOD pushbutton and enter a modulation of
20 into TI.
(5) Enter an RF LEVEL of -6 dBmW into TI. If measuring receiver does not
indicate between 19.5 and 20.5 percent amplitude modulation, perform b (1) below.
(6) Enter a frequency of 113.00 MHz and a modulation of 30 into TI.
(7) Press TONE SELECT 30 Hz pushbutton. If measuring receiver does not
indicate between 29.25 and 30.75 percent, perform b (2) below.
(8) Press TONE SELECT 9960 Hz pushbutton. Measuring receiver will indicate
between 29.25 and 30.75 percent.