DRAKE R-4C Especificaciones descargar pdf (Pagina 12)

FRONT PANEL CONTROLS

1. S Meter: Indicates relative signal strength.

Calibrated in S units from 1 to 9. Above 9 the

scale is calibrated in decibels.

2. FUNCTION Switch: Selects standby, external

mute and crystal calibrator functions and

switches in the Model 4-NB Noise Blanker.

Also turns the Receiver on and off.

3. MODE Switch: Selects Receiver operating

mode.

4. Main Tuning Dial: Displays a portion of the

received frequency from zero to 500 kHz. The

reading must be added to the BAND switch

setting to determine the exact frequency.

5. Main Tuning Control: Adjusts frequency set-

ting of the Main Tuning Dial.

6. AGC Switch: Selects the release time constant

of the automatic gain control circuit (slow: S;

medium: M; fast:

F)

or turns off the AGC.

7. NOTCH Control: Attenuates heterodyne in-

terference in all modes of reception.

8. PASSBAND TUNING Control: Adjusts the

positioning of the BFO in SSB and CW modes.

9. Phone Jack: Provides a connection for head-

phones.

10. PRESE LECTOR Control: Tunes the antenna,

RF and premixer coupling coils.

11. GAIN Control: Knob adjusts AF gain. Lever

controls RF gain (normally in full clockwise

position).

12. XTALS Switch: Selects accessory crystals for

accessory band operation

(

15 positions). NORM

position transfers crystal selection function to

BAND switch for amateur band operation.

13. BAND Switch: Selects amateur band desired

when XTALS switch is in NORM position.

Also selects proper RF circuits for accessory

crystal operation (refer to table 2-l for correct

setting).

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