Heathkit SB-401 Assembly Manual page 5

Page 3
Refer to the "Kit Builders Guide" for complete
information on parts identification, tools, wiring,
soldering, and step-by-step assembly proced-
ures.
Other
operating features include: voice oper-
ated (VOX) and push-to-talk (PTT) control in
the 8SB mode; break-in keying in the CW
mode; built-in antenna change-over relay;
SWitched 120
V
AC to operate an external an-
tenna relay; crystal filter type SSB generator;
and automatic level control to prevent distor-
tion while providing high talk power. The large
circular dial has calibration marks every kilo-
hertz and covers 100 kilohertz for every revo-
lution to provide a bandspread equal to approxi-
mately 10 feet per megahertz. A slide-rule-
type dial pointer clearly indicates the number of
rotations of the circular dial. The knob-to-dial
ratio is approximately 4:1.
All-aluminum metal parts provide light-weight
and sturdy construction. Assembly time-saving
features include circuit boards, wiring cable
assemblies, and a preas sembled LMO tuning
unit, The transformer-operated, silicon diode
power supply' is
a
long-life, low-heat power
source.
Complete Transceive capabilities are available when the
Transmitter is used with the Heathkit Model SB-300, SB-30 1,
or 5B·303 Receiver. The Transmitter can also be used with
other receivers by installing the SBA-401-1 Crystal Accessory
Kit in the Transmitter. This Transmitter is compatible with
the
Heathkit Model SB-200 SSB Linear Amplifier.
The Heathkit Model SB-401 SSB Transmitter
is capable of SSB (upper or lower sideband) and
CW operation on all amateur bands from 3.5 to
30 megahertz. A crystal-controlled heterodyne
oscillator and a preas sembled, pre aligned linear
master oscillator insure highly accurate and
stable operation.
DUCTI
INTR