Internal speaker
This is the main ON/OFF switch for the receiver. When the POWER switch is in the OFF position, on/off control may be exercised by the clock timer. See the "Operation" section for details.
This is a standard 1/4" headphone jack. When the headphone plug is inserted into this jack, the internal speaker is automatically cut off. The audio output impedance is 8 ohms.
(4) REC
This miniature phone jack is for recording purposes. The output level is approximately 100 mV (fixed), irrespectivee of the setting of the AF GAIN control.
(5) MODE
This control chooses the desired mode:
LSB/CW Use this position for lower sideband (LSB) and Morse Code (CW) reception.
USB Use this position for upper sideband (USB) reception. This position may also be used for CW reception, if desired.
AM N Use this position for narrow-band AM reception. Under conditions of extremely heavy adjacent frequency interference, this position of the mode switch may allow AM reception where a wider mode would be unusable. There will be some degradation in fidelity in the AM N position, however
AM M For all-around AM reception, the AM At position of the mode switch may be used. Because of the wider bandwidth, the fidelity on the incoming signal is much better than with the AM N filter.
AM W Under clear band conditions. the AM W provides the widest bandwidth and best fidelity.
FM This position selects reception of FM signals.
(6) AGC
This switch allows selection of the optimum AGC (Automatic Gain Control) decay time. The SLOW position is normally used for AM reception, while the FAST position is normally chosen for Morse Code (CW) reception. For SSB reception, the optimum position is determined by band conditions and the adjacent-frequency interference level.
(7) NB
This switch, when pressed, activates the noise blanker for reduction in the level of interfering pulse-type noise.