DRAKE R-4C Spezifikationen PDF herunterladen (Seite 15)

f. Set AF GAIN knob to a comfortable level.

g. Set PRESELECTOR control to center of band

segment marked on panel. After desired signal is

tuned in, adjust for maximum S meter reading.

3-17. SSB RECEPTION.

a. Make the basic control settings listed above.

b. Set MODE switch to SSB.

c. Set

PASSBAND

TUNING to the dot at either

the LSB or USB position as desired.

d. Set AGC switch to S.

e. Tune in station with Main Tuning knob.

f. Adjust PRESELECTOR for maximum S meter

reading.

After tuning in a station as described above, addi-

tional adjustments may be made to further improve

reception under various conditions or operator

preferences.

g. Normally the AGC time constant S is optimum

for SSB but for rapidly changing signal condi-

tions, it may be desirable to switch to the AGC

release time constant M. The F or OFF positions

will not normally be desirable for SSB reception.

h. The PASSBAND TUNING control may be

ad-

Under extremely adverse interference conditions

the 1.5 kHz bandwidth crystal filter may be used

to advantage for SSB reception if this accessory

filter has been installed. Careful adjustment of

the

PASSBAND

TUNING control will aid in the

effective use of this restricted bandwidth for

SSB reception.

The NOTCH control may be used to attenuate

an interfering heterodyne. See paragraph 3-l 2

for adjustment of this control.

k. If impulse type noise interference is a problem,

the accessory 4-NB Noise Blanker may be

installed. The Noise Blanker may then be activa-

ted by placing the FUNCTION switch in the NB

position.

justed

slightly away from the dot at the LSB or

USB position to emphasize low or high frequen-

cies. The fine adjustment of this control is large-

ly one of operator preference, and the setting

should be the one which produces the most

pleasing audio response or minimum interference.

3-18 CW RECEPTION.

Make the basic control settings listed in para-

graph 3-l6.

Set the MODE switch to SSB if the 2.4 kHz

bandwidth filter is desired. If one of the narrow-

er bandwidth accessory crystal filters has been

installed it may be selected with the MODE

switch.

Set the PASSBAND TUNING to the dot at LSB

or USB if the SSB mode is used. If the 1.5 kHz

accessory bandwidth is used, set this control just

beyond one end of the second longest line. If the

500 Hz or 250 Hz filter is used, set the

PASS-

BAND TUNING just beyond one end of the

shortest line.

Set the AGC switch to S.

Tune in a CW signal with Main Tuning knob for

maximum S meter reading.

Adjust PRESELECTOR for maximum S meter

reading.

After tuning in a station as described above, addi-

tional adjustments may be made as follows:

If a different frequency beat note is desired, re-

tune the MAIN TUNING for desired beat note

while keeping the signal peaked for maximum

strength with the PASSBAND TUNING control.

Faster AGC release time constants may be selec-

ted with the AGC control. If desired, the AGC

may be switched OFF and the gain controlled

manually with the RF GAIN lever.

The NOTCH control may be used to attenuate

interfering undesired heterodynes. See paragraph

3-l 2 for adjustments of this control.

The accessory 4-NB Noise Blanker may be used

if impulse noise interference is a problem.

3-19. AM RECEPTION.

Make the basic control settings listed in para-

graph 3-16.

Set MODE switch to AM.

Tune in station for maximum S meter indication.

d. Peak PRESELECTOR for maximum signal

strength.

3-6

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