Specifications

2.8.1 POWER
The power
connector mates with both the AC and DC power cords .
See
“2 . 3 ”
2.8.2 FUSE
The fuse holder must have the proper fuse installed for 120 or 240 V AC
operation . See “2
.3 ”
2.8.3 SPEAKER
The interna1 speaker is normally
connected to the speaker jack, when an
external speaker is used, disconnect the interna1 speaker by removing
the plug and
connect the external speaker to this jack.
2.8.4 ANTI VOX and INJECTION
The holes marked ANTI VOX and INJ are intended for installation of
connectors for the TA-4 accessory which permits the SPR-4 to transceive
with the T-4XB. The injection and anti-vox tables from the T-4XB are
plugged into these jacks .
2.8.5 MUTE
A shorted phono
connector is normally installed in the MUTE jack. When
the shorted
connector is removed, the SPR-4 will be muted . When the
SPR-4 is used as a companion to the
T-4XB, the mute table from the
T-4XB is plugged into this
jack.
2.8.6 GROUND POST
A binding post is provided to
allow connecting the SPR-4 chassis to
earth ground .
2.8.7 RTTY
The hole marked RY is intended for the installation of a
connector for the
RY-4 accessory which permits the SPR-4 to receive RTTY signals . An
ex-
ternal switch is plugged into this jack which enables RTTY reception
when the jack is shorted and the SPR-4 mode switch is in the CW or LSB
position
.
2.8.8 AUDIO IN/OUT
The AUDIO
IN/OUT jack provides approximately .08 volts of audio into
a high impedance load
such as a tape recorder. The output level is inde-
pendent of the setting of the AUDIO GAIN control.
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