AM
This control is used to set the dial skirt to exact center frequency of calibration signal. For first
setting rotate tuning knob nearest to the 100 KHz maker signal until the tone is in the zero beat.
Hold the tuning knob firmly at this point and rotate the dial skirt to zero position. The skirt dial is
just behind the tuning knob and is held in position by a friction-locking device. This dial is easily
moved by hand but will remain in position after adjustment. In the AM position no calibration
tone can be heard, however, accurate frequency location can be determined by observing the "S"
meter for maximum indication when tuning thru the calibration signals.
CW/SSB
With the controls set as described above, a marker signal should be heard from the speaker. Ro-
tate the main tuning knob until the tone reaches zero beat. When the tone is at zero beat, turn the
“0” marking on the dial skirt to the line marked LSB. This zero beat signal can be heard every
100 KHz. If 25KHz knob is pushed, signal can be heard every 25 KHz. When the function
switch is set to USB, tune the “0” marking on the dial skirt to the line marked USB in the same
manner. The dial is now calibrated. This same procedure must be followed for dial accuracy
when switching to other bands.
Q-MULTIPLIER
The Q-multiplier operates in all modes, CW, AM and SSB, to null unwanted signals with a deep
40 dB notch, or peak the desired signal while sharpening receiver selectivity to help you pick the
signal you want out of the noise. The selector switch has off, reject and select positions. A tune
control allows you to move the "peak" or "null" throughout the receiver bandpass. When cen-
tered, the notch or peak will be in the middle of the bandpass, and moving the control to either
side will shift the notch or peak towards either side of the bandpass.
ADDITIONAL FREQUENCY COVERAGE
For coverage other than the International Broadcasting Band, two extra crystal sockets are pro-
vided on the RF printed circuit board. Their receiving range is any 500 KHz bandwidth between
3.5-10 MHz and 10.0-30 MHz.
The extra crystal frequency is calculated as follow.
Extra crystal frequency = Low-end frequency of receiving band +2.920 MHz.
For example, if you want to receive 15 Meter Amateur band range from 21.0 to 21.5 MHz.
Extra crystal frequency = 2l.0 MHz +2.920 MHz = 23.920 MHz.
Insert this crystal to the extra crystal socket X11 for receiving range between 10-30 MHz, or
X1 for 3.5-10 MHz, and an extra capacitor must be added in parallel with TC-4 for 3.5-10
MHz or TC-l I for 10-30 MHz. The trimmer capacity should be adjusted for correct frequency
and also maximum output. The extra capacitor value is shown in Fig. 2-3 and Fig. 2-4.
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Summary of Contents for SX-190
Page 1: ......
Page 7: ...FIGURE 1 3 ATTACHING CABLE TO PHONE PLUG CONNECTOR FIGURE 1 4 INSTALLATION OF GROUND 6 ...
Page 17: ... 16 ...
Page 22: ...SCHEMATIC DIAGRAM OF RF AMP 21 ...
Page 23: ...SCHEMATIC DIAGRAM OF BUFFER AMP SCHEMATIC DIAGRAM OF CALIBRATOR 22 ...
Page 24: ...SCHEMATIC DIAGRAM OF VFO SECTION 23 ...
Page 25: ...SCHEMATIC DIAGRAM OF I F AMP SECTION 24 ...
Page 26: ...SCHEMATIC DIAGRAM OF POWER SUPPLY 25 ...
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