Heathkit SB-401 Assembly Manual page 171

1. MAY VARY.
2. CHASSIS GROUND.
3. FILAMENT.
4. VARIES WITH SETTING OF LEVEL CONTROL.
S. VOL TAGE PRESENT ONL'Y ON LSB.
6. TUBE IS CUT OFF.
7. VOL TAGE DEPENDS ON AMPLITUDE OF HETERODYNE MIXER INJECTION.
8. VARIES WITH CRYSTAL ACTIVITY AND HETERODYNE OSCILLATOR COIL SETTING.
9. PENTODE SECTION OPERATES ONLY IN TRANSCEIVE.
10. RELAY NOT CLOSED.
11. OPERATES ONLY WITH KEY DOWN IN CW MODE.
12. GROUNDED BY THE FUNCTION SWITCH.
13. VARIES WITH SETTING OF VOX CONTROL.
14. VARIES WITH SETTING OF ANTI-VOX CONTROL.
15. VARIES WITH VOLTAGE IMPRESSED ACROSS DIODE.
16. GROUNDED BY MODE SWITCH.
17. VARIES WITH SETTING OF BIAS ADJUST CONTROL.
le.
HETERODYNE OSCILLATOR INPUT FROM RECEIVER IN TRANSCEIVE ONLY.
19. VOLTAGE IN TRANSCEIVE ONLY.
20. VARIES BETWEEN LSB, USB, CW, AND TUNE.
21. PROVIDES BIAS VOLTAGE TO UNBALANCE BALANCED MODULATOR.
22. TO CHASSIS.
23. INFINITY IN USB OR LSB.
24. APPROXIMATELY 50 K AFTER A FEW SECONDS IN LSB OR USB.
25. GROUND IN CW AND TUNE.
OPEN
• MINIMUM AFTER
5 SECONDS
•• APPROX1l\1:A TEL Y
OPEN
o
RELPWR
KEY
LMO
Fully
clockwise
Fully
clockwise
RELPWR
Tuned
Full counte r-
clockwi se dial
marking
'METER
LEVEL
DRIVER
FINAL 80
FINA L LOAD 50
n
CW MODE CW
3. 5
SPOT STBY
BAND
c )
OFF TRCV
C) (
MEASUREMENTS COf\TDITIQNS SWITCH AND
CONTROL
POSITIONS
FUNCTION
VOL TAGE AND RESISTANCE CHART NOTES
Page 145