DRAKE R-4C Especificaciones descargar pdf (Pagina 9)

should be used for accessory coverage. Selected

crystals for accessory coverage with the R-4C will

be supplied by the R. L. Drake Company at a nom-

inal cost. Contact Customer Service Department at

the address given in paragraph 5-l for price and

delivery information.

To determine the correct

crystal frequency for any additional range, see

table 2-l which shows the required crystal frequen-

cy and the proper BAND switch setting for the

R-4C for the frequency spectrum from 1.5 to 30

MHz, except for the 5.0 to 6.0 MHz range. How-

ever, if you are going to transceive with the Drake

T-4,

T-4B,

T-4C,

T-4X,

T-4XB,

T-4XC,

the crystal selection table in the transmitter manual

should be followed in selecting accessory crystals.

Remove the screws holding the shield/cover over

the 15 accessory crystal sockets on the rear panel.

Install the desired crystals and replace the cover

and its mounting screws.

2-15. NOISE BLANKER.

To install the optional 4-NB Noise Blanker, re-

move the top row of three screws on each side of

the R-4C. Remove the cabinet top. Remove the

jumper plug from the noise blanker socket which is

located toward the rear of the receiver, on top of

the chassis. Retain the jumper plug so that it may

be used if the 4-NB should ever require service.

The 4-NB mounts on the four plastic stand-offs

which are on the metal shields on either side of the

PTO. Align the plastic stand-offs with the four

holes in the 4-NB circuit board with the 4-NB

cable toward the rear of the R-4C. Carefully push

the 4-NB onto the stand-offs until it snaps into

place. Dress the 4-NB cable toward the rear of the

receiver and through the notch in the filter shield

just above the NB socket and under the mode

switch cover. Plug the 4-NB into the NB socket

of the R-4C.

Turn on the receiver and tune in the crystal cali-

brator signal. Detune the PRESELECTOR until

calibrator signal S meter reading is around

S5.

Temporarily unplug the 4-NB cable and reinstall

the jumper plug. Compare S meter readings. If the

gain varies more than

l/2

S unit between the 4-NB

and the jumper plug, adjust R12 (blue potentiom-

eter on 4-NB) until S meter readings are equal

when switching between the 4-NB and the jumper

plug. Replace cabinet top.

2-16. CONNECTION TO T-4XC

TRANSMITTER.

For interconnection diagram see the T-4XC in-

struction manual.

2-17. CONNECTION TO

T-4/T-4X/T-4B/

T-4XB

TRANSMITTERS.

Connect as indicated in the transmitter instruction

manual. No connection will be made to the CAR

OSC jack and the shorted phono plug should be

left in the PTO LAMP jack. Follow the instructions

in the transmitter manual for Transceive Alignment

if necessary. When making the adjustment, set the

R-4C PASSBAND TUNING at 12 o’clock and the

MODE Switch to SSB. Other control settings are

the same as stated for the R-4/R-4B. The adjust-

ment on the R-4C is C59 located on a PC board on

the top of the R-4C chassis (see figure 5-l). Adjust

this capacitor for zero canary chirps.

2-18. CONNECTION TO TR-4 OR TR-4C.

To use the R-4C as an external receiver with the

TR-4/TR-4C

transceiver, make the connections

illustrated in figure 2-3.

2-3

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 28 29

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