Allied SX-190, Instruction Manual

AM Operation 

For the reception of stations place all controls in the positions indicated in the Initial Control Set-
tings chart. Tune in a station, using Main tuning controls as indicated in the section under 
"TUNING". Adjust Preselector for highest "S" meter reading. This control setting is satisfactory 
while operating over a limited frequency range. If excessive spurious noises such as those caused 
by auto ignition make reception difficult, place the FUNCTION switch in the AM ANL position. 
The automatic noise limiter should be used only when necessary, since it tends to reduce the 
overall efficiency of the receiver. 

CW Operation 

The control setting required for the reception of code signals are indicated in the chart. Tune sig-
nal to zero beat. The main tuning dial control should then be adjusted on either side of the center 
for desired pitch. 

Signal Sideband Operation 

For SSB reception, the dial should be turned very slowly.  Excessive signal strength during SSB 
reception may make demodulation difficult. In such cases decrease the RF GAIN by turning this 
control to the left. Smooth demodulation will then be possible. 

Control settings for sideband reception are virtually the same as for CW.  Note, however, that 
two positions of the function control are provided to permit selection of either the upper or lower 
sideband, as necessary. The sideband that must be selected will depend upon the band in use. As 
indicated in the sideband selection chart (TABLE 2), the lower sideband is usually required for 
SSB reception on 80 and 40 meters, the upper sideband for SSB reception on 20, 15 and 10 me-
ters. 

TABLE 2 

METERS FREQUENCY 

SIDEBAND 

USED 

80 

3.5 to 4.0 MHz 

Lower 

40 

7.0 to 7.5 MHz 

Lower 

20 

14.0 to 14.5 MHz 

Upper 

15 

21.0 to 2l.5 MHz 

Upper 

10 

28.0 to 29.7 MHz 

Upper 

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