TB 9-6625-2059-35
10. Output Level
a. Performance Check
(1) Set FREQUENCY MHz switches to 100 000 0 and HI LVL - V X100-NORM
switch to HI LVL.
(2) Adjust BFO-RF LEVEL control until TI 0 dBm light just illuminates.
(3) Connect measuring receiver to TI TRANS-RCVR.
(4) Set measuring receiver to read frequency and then for tuned level measurement.
(5) Measuring receiver will indicate between -2.5 and +2.5 dB in tuned level.
(6) Set HI LVL - VX100-NORM switch to VX100 and adjust BFO-RF LEVEL
control to -100 dBm. If measuring receiver does not indicate between -57.5 and -62.5 dBm,
perform b below.
NOTE
If measuring receiver cannot maintain phase lock, check TI
residual FM performance as outlined in paragraph 16 below.
Rerun paragraph 10 using an appropriate low pass filter.
(7) Repeat technique of (6) above for BFO-RF LEVEL control settings and
indicate within limits specified.
Test instrument
Measuring receiver indications (dB)
BFO-RF LEVEL
FREQUENCY MHz
Min
Max
control settings
switch settings
80
100 000 0
-37.5
-42.5
90
100 000 0
-47.5
-52.5
110
100 000 0
-67.5
-72.5
120
100 000 0
-77.5
-82.5
(8) Set HI LVL - VX100-NORM switch to NORM and BFO-RF LEVEL control
to -80 dBm. Measuring receiver will indicate between 77.5 and 82.5 dB.
(9) Set FREQUENCY MHz switches to 250 000 0 and HI LVL - VX100-NORM
switch to HI LVL.
(10) Adjust BFO-RF LEVEL control until TI 0-dBm light just illuminates.
(11) Repeat (4) above.
(12) Measuring receiver will indicate between -4.0 and +4.0 dB.
(13) Set HI LVL - VX100-NORM switch to VX100 and adjust BFO-RF LEVEL
control to -100 dBm. Measuring receiver will indicate between -56 and -64 dB.
(14) Repeat technique of (13) above for BFO-RF LEVEL control settings and
indicate within limits specified.
12 CHANGE 1
