SECTION 2: CONTROLS AND THEIR FUNCTIONS
Power Switch (A)
Turns the set power on and off.
Function Switch (B)
This switch selects the mode of operation for the receiver. Each position selects the following
mode:
USB This position is used for CW (continuous wave or code) and upper SSB (Single
side-band) operation.
LSB
This is the position to use for lower SSB and CW reception.
Stand by
This position cuts off the B supply voltage, making the receiver temporarily inoperative during
transmission periods.
AM
This position provides for normal reception of amplitude-modulated signals using diode detec-
tion.
AM ANL
This position provides for reception of amplitude-modulated signals under conditions of exces-
sive external interference. ANL stands for Automatic Noise Limiter.
Band (C)
This an 11-position Band Change Switch to cover the international broadcasting bands from 3.5
to 18.0 MHz, the 15 MHz standard frequency signal (WWV) and the 27 MHz CB band.
Tuning (D) (E) (F)
This is the Main Tuning Knob. One revolution controls a 50 KHz linear dial reading. Each indi-
cation line on the knob indicates 1 KHz, for frequencies between 3.5 and 30.0 MHz. The dial
skirt is held in place by a fiction clutch, which allows easy adjustment for calibration.
Preselector (G) (H)
The Preselector is a three-section air variable capacitor that tunes the input to the RF amplifier,
output from the RF amplifier, and the input to the 1st mixer simultaneously. This control can be
set approximately to the desired frequency by using the marking on the Preselector dial. After
setting to the correct frequency and tuning in the desired signal with the frequency tuning knob,
this control must be "peaked" in order for the receiver to provide the optimum in sensitivity.
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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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