DRAKE R-4A Spécifications télécharger pdf (Page 15)

Under crowded band conditions it will be advantageous to use the

4 KC selectivity position and

reposition

the

Passband

knob for

maximum S-Meter reading on a signal tuned in to the desired pitch.

After the

Passband

control is adjusted thus, simply tune in a CW

signal for maximum S-Meter reading and it will automatically be the

correct pitch.

It will sometimes be to your advantage to shift the

passband

of the

receiver to the other side of the BFO frequency for better copy under

crowded band conditions. This can be accomplished simply by re-

positioning the

Passband

knob to the alternate dot and retuning the

station with the main tuning knob.

Noise and strong interfering signals can be attenuated using the N .B.

and Notch functions as described later in this section.

Many operators prefer no AVC on CW. If this is your preference,

turn the SSB/CW-AM switch to the AVC OFF position, turn the A.F.

Gain fully clockwise and regulate receiver gain with the

F. Gain

---

control.

D. AM Reception

Set the

Passband

selector lever to 4.8 KC and set the

Passband

tuning knob to the middle of the longest line.

Set the SSB/CW-AM switch to AM.

Tune in a signal with the main tuning knob.

Interfering heterodynes can now be eliminated using the Notch control,

and noise can be reduced or eliminated by turning the Function switch

to N. B. A detailed description of these functions follows.

RTTY Reception

Set the

Passband

selector lever to the 1.2 KC position and set

the

Passband

knob to the right of the dot corresponding to lower

sideband.

Set the SSB/CW-AM switch to Fast AVC.

Tune in a signal with the main tuning knob for correct indication

on your terminal unit tuning indicator and adjust

Passband

tuning

knob for equal S-Meter reading of both mark and space.

If the station you are copying is sending upside down (mark low-space

high) turn the pa ssband control to the left of the “upper” dot and retune

the station with the main tuning dial.

If noise is a problem,turn the Function switch to N. B.

Interfering

heterodynes can be eliminated using the Notch control.

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DRAKE R-4A Spécifications Page 15

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