DRAKE R-4C Specifications download pdf (Page 16)

e. Medium or Fast AGC time constant may be

h. The 4-NB Noise Blanker may be used if it has

used if desired.

been installed.

f. Additionally, the NOTCH filter may be used if

necessary to attenuate interfering heterodynes.

See paragraph 3-l 2.

3-21. NOISE BLANKER.

g. The 4-NB Noise Blanker may be used if impulse

noise interference is a problem. The 4-NB will

function on AM as well as

SSB/CW.

3-20. RTTY RECEPTION.

This accessory is activated by placing the FUNC-

TION switch in the NB position. The Model 4-NB

Noise Blanker can be used on any type of reception.

It is most effective on short duration noise impulses

such as those generated by automotive ignition

systems. Refer to paragraph 2-l 5 for installation

instructions.

Make the basic control settings listed in para-

graph 3-l 6.

Set MODE switch to SSB; or, if the 1.5 kHz fil-

ter has been installed, this position may be used.

Also, if the 500 Hz filter has been installed, this

filter may be used for narrow shift RTTY

reception.

Set

PASSBAND

TUNING to the RTTY region.

Make fine adjustment for optimum reception.

Tune in station with MAIN TUNING knob.

Adjust PRESELECTOR for maximum S meter

indication.

It may be desirable to use the M or F AGC time

constant.

The NOTCH control may be used to attenuate

interferring heterodynes. See paragraph 3-l 2.

BAND

3-22. ADDITIONAL TUNING RANGES.

By inserting the appropriate crystals in the acces-

sory crystal sockets at the top rear of the chassis, it

is possible to add up to 15 additional tuning ranges

(each 500 kHz wide) to the coverage of the R-4C.

With the exception of the band from 5.0 to 6.0

MHz, these additional ranges may be anywhere

between 1.5 and 30 MHz. In order to receive with

an accessory crystal,

the XTALswitch

of the R-4C

must be set to the number corresponding to the

accessory crystal socket into which the crystal was

plugged. The lowest frequency of the accessory

range may then be marked in the range window for

reference. The marking is easily erased when crystals

are changed. Refer to figure 3-2 for the recom-

mended tuning range for each band.

3.5

7.0

14.0

21.0 28.0

1.5

2 3 4

20 30

FREQUENCY (MC)

NOTE:

SOLID LINE INDICATES RECOMMENDED RANGE FOR EACH BAND.

Figure 3-2. Preselector Tuning Ranges

3-7

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 28 29

Comments to this Manuals

No comments

DRAKE R-4C Specifications Page 16

Comments to this Manuals

Related products and manuals for Receiver DRAKE R-4C