Heathkit SB-401 Assembly Manual page 146

Bias Adjust control.
VOX Gain control.
VOX Delay control.
Anti- VOX control.
ALC Adjust control.
Carrier Null control and capacitor.
Sideband Amplitude Balance control.
Relative Power Adjust control.
Sidetone Level control.
• • • • ••••••••••
•
•
Internal Controls.
Main (LMO) Tuning.
Function switch.
Band switch.
Mode switch.
Driver tuning.
Final tuning.
Final loading.
Mic and CW Level control.
FREQ CONTROL switch.
Meter switch.
Front Panel Controls. • • • • • ••••••••••
Break-in CW; provided by operating VOX from
a
keyed tone, using grid-block keying.
Keying Characteristics. • • • ••••••••••••
Internally switched to speaker with transmitter
in CW mode and key depressed. Approximately
1000 Hz
tone.
CW
Sidetone, • • • •••••••••••••••• • • •
High impedance or phone patch.
Audio Input. • • • • • • • • • • • • • • • • • • • • •
10
db nominal at
0.2
rna final grid current.
Audio Compression. • • • • • ••••••••••••
350
to
2450 Hz ±3
db.
Audio Frequency Response ••••••••••••••
At least
40 db
below rated carrier.
• •
•
• • • •
•
• •
• • • •
Level. • • • • • • Noise
30
db down from rated
P.E.P.
output.
•
•
• •
•
••••••••
Third Order Distortion. •
55
db down from rated output at
1000 Hz and
higher.
Unwanted Sideband Suppression. • • • • • •••
35
db below rated output.
Harmonic Radiation. • • • • • • • • • • • • • • • • •
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