TB 9-6625-2094-35
(7) Set MODULATION FM/AM slide control to 0. The digital multimeter should
indicate 0 V 20 mV dc.
(8) Disconnect the digital multimeter from MOD TP (fig. 1) and ground.
(9) Adjust M29-2 POT B (fig. 2) to produce an indication of 2.000 MHz 100 Hz on
frequency counter (R).
(10) Set MODULATION FM/AM slide control to full up position and adjust M29-2
POT A (fig. 2) to produce an indication of 2.100 MHz 100 Hz (R) on frequency counter.
(11) Set MODULATION MODE switch to FMx1 and adjust MODULATION
BOARD POT B on left side of board (fig. 2) to produce an indication of 2.010 MHz 100 Hz on
frequency counter (R).
9. Frequency Stability
a. Performance Check
(1) Position controls as listed (a) through (e) below:
(a) FREQUENCY VERNIER control to CAL.
(b) MODULATION MODE switch to CW.
(c) OUTPUT step attenuator control for 0 dBm.
(d) OUTPUT VERNIER control fully cw.
(e) Set FREQUENCY switches to indicate 500.000 MHz.
(2) After frequency counter indication stabilizes, record frequency indication.
(3) Monitor frequency counter indication for 1 hour. The frequency will not drift
more than 200 Hz from the value recorded in 2. above.
(4) Position controls as listed in (a) through (c) below:
(a) FREQUENCY VERNIER control to 0 kHz.
(b) MODULATION MODE switch to FMx1.
(c) MODULATION FM/AM slide control to 10 kHz.
(5) After 1 minute stabilization period. Record frequency counter indication.
(6) Monitor frequency counter indication for 10 minutes. The frequency will not
drift more than 500 Hz from the value recorded in 5. above.
(7) Disconnect frequency counter CHANNEL A from TI RF OUTPUT.
b. Adjustments. No adjustments can be made.
10. Output Meter Accuracy
a. Performance Check
(1) Connect measuring receiver sensor module (HP 11722A) to RF POWER
CALIBRATION OUTPUT.
