Figure 2. Frequency doubler--internal view.
(1) Set signal source ATTENUATOR control
(2) Connect oscilloscope (A4) to crystal
for O dBm indication on power meter (A5) and adjust R2
detector, using cable assembly (B3).
for CAL indication on power monitor meter.
(3) Set TI MODULATION SELECTOR
(2) If the spread is within +2.7 dB for Model
switch to SQ WAVE.
1709 and -3 dB for Model 1710, but the absolute level is
(4) Rotate SQ WAVE control throughout its
high or low, center it by adjusting R2 (R).
range.
(3) If the spread is too large, time the
(5) If waveform displayed on oscilloscope is
frequency to the lowest output point and adjust R1 for -2
not a symmetrical square wave at a rate variable from
dBm indication on power meter (R).
800 Hz to 1200 Hz, perform b below.
b. Adjustments. Adjust R73 (fig. 1) for best
(4) Repeat (2) and (3) above until power
output level is within tolerance.
symmetry of square wave displayed on oscilloscope.
10. Square Wave Symmetry. a. Performance
a. Performance Check
11. Attenuation.
Check
(1) Connect equipment as shown in figure
(1) Connect crystal detector (B6) to signal
source RF OUTPUT.
6
