TB 9-6625-1914-24
(4) Adjust signal generator frequency to center a signal pip (approximately 10 MHz)
on display.
place a signal pip at a point 50 kHz below signal generator pip (approximately 9.95 MHz).
(6) Adjust amplitude controls of signal generator and function generator no. 1 until
both signal amplitude displays peak 3 dB below the LOG REF graticule line (-43 dBm).
(7) Adjust FREQUENCY control to observe display at 19.95, 10.05, 9.9, 29.95, and
29.9 MHz. Spurious response appearing on display at the above points will not be larger
than -110 dBm LOG REF line (-70 dB down from -40 dB LOG REF graticule line).
b. Adjustments. No adjustments can be made.
22. Local Oscillator Stability
a. Performance Check
(1) Position TI controls as listed in (a) through (f) below:
(a) FREQUENCY control to 0 MHz (local oscillator feed-through).
(b) BANDWIDTH switch to .1 kHz.
(c) SCAN WIDTH (red) switch to PER DIVISION.
(d) SCAN WIDTH PER DIVISION switch to 0.2 kHz.
(e) INPUT ATTENUATION switch to 0 dB.
(f) TUNING STABILIZER switch to ON (up).
(2) Position IF plug-in controls as listed in (a) through (f) below:
(a) SCAN TIME PER DIVISION switch to 50 ms.
(b) LOG-LINEAR switch to LINEAR.
(c) LINEAR SENSITIVITY (LOG REF LEVEL) switch and vernier controls
for a full 8 division vertical display of local oscillator feed-through signal.
(d) VIDEO FILTER switch to OFF.
(d) SCAN MODE switch to INT.
(e) SCAN TRIGGER switch to AUTO.
(3) Adjust FREQUENCY control until upward slope of signal pip intersects
CENTER FREQUENCY graticule line one division from top graticule line as shown in
figure 10. Note where slope of display intersects center horizontal graticule line.