DRAKE R-4C Especificaciones descargar pdf (Pagina 8)

2-6. MUTE.

2-11. SPEAKER.

The MUTE jack provides connections for external

standby-receive switching. The external circuit must

isolate the MUTE jack center conductor from

ground for standby, and connect it to the MUTE

jack ground for receive. The R-4C is shipped with

a shorted phono plug in this jack. When used with

a transmitter, remove the shorted plug and connect

the appropriate cable to the transmitter MUTE

jack.

2-7.

ANTI VOX.

High impedance audio is available at the ANTI

VOX jack for use with the anti

VOX circuit of the

transmitter.

2-8.

INJECTION.

The phono jack marked INJ. provides a means of

coupling the premixer system of the R-4C to the

Drake T-4,

T-4B,

T-4C,

T-4X, T-4XB or

T-4XC transmitters for transceive operation.

2-9. CARRIER OSCILLATOR.

The jack marked CAR. OSC provides a means of

coupling injection from the T-4XC carrier oscilla-

tor to the R-4C receiver. This connection phase-

locks the two units to exactly the same frequency

when used in the SSB Transceive mode. No connec-

tion is made to this jack for use with the T-4X or

T-4XB transmitter.

2-10. PTO LAMP.

This jack provides a ground return for the pilot

lamp behind the PTO dial. The R-4C is shipped

with a shorted phono plug in this jack so that the

lamp will light. When the R-4C is used with the

T-4XC transmitter, remove the shorted phono

plug and connect a cable between the PTO lamp

jacks of the two units. The lamp will then light

only when the T-4XC TRANSCEIVE switch is in

the RCVR, SEPARATE, or SPOT positions. In the

XMTR position, the lamp will not light to indicate

that the R-4C PTO is disabled.

The audio output from the receiver is available at

the jack marked SPKR. The output impedance is

3.2 Ohms.

2-12. ACCESSORY POWER.

The accessory power socket, labeled ACCY POWER,

located on the rear of the chassis, provides power

for operating accessories. Maximum load is 6.3

Volts AC at 300 milliamperes and 12 Volts DC at

50 milliamperes. A connection to the antenna is

also available. The socket mates with a Cinch type

5AB2

plug.

2-13. ACCESSORY CRYSTAL FILTER

INSTALLATION.

To install additional crystal filter(s), proceed as

follows: Remove the two screws holding the filter

cover bracket for each position in which a filter is

being installed. The upper position is for the .250

kHz filter, the center position is for the .500 kHz

filter, and the lower position is for the 1.5 kHz

filter. If a filter for the AM mode is being installed,

remove the top cover of the

R-4C,

the mode

switch cover and remove the filter cover bracket

and the 150 Ohm jumper resistor from the AM

filter socket. Very carefully plug each filter straight

into the sockets.

After installing all the filters desired, replace the

cover brackets over each filter and tighten the

mounting screws. Do not attempt to use accessory

filters without installing the brackets as it is very

important to have a solid ground connection be-

tween the bottom of the filter and the spring

material.

2-14. ACCESSORY CRYSTALS.

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 be-

tween 1.5 and 30 MHz. Only series resonant crystals

2-2

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

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DRAKE R-4C Especificaciones Pagina 8

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